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Accueil > Information scientifique > Production Scientifique

Publications Scientifiques

(Archive Ouverte HAL)

[in2p3-01274914] Monte Carlo MSM correction factors for control rod worth estimates in subcritical and near-critical fast neutron reactors

17 février 2016

The GUINEVERE project was launched in 2006, within the 6th Euratom Framework Program IP-EUROTRANS, in order to study the feasibility of transmutation in Accelerator Driven subcritical Systems (ADS). This zero-power facility hosted at the SCK·CEN site in Mol (Belgium) couples the fast subcritical (...)

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[in2p3-01176181] Primary processes: from atoms to diatomic molecules and clusters

25 janvier 2016

This article presents a short review of the main progresses achieved at the GANIL facilities during the last thirty years in the field of ion-atom and ion-diatomic molecule collisions. Thanks to the wide range of projectile energies and species available on the different beam lines of the (...)

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[in2p3-01244201] Structure of $^{26}$Na via a Novel Technique Using ($d,p\gamma $) with a Radioactive $^{25}$Na Beam

16 décembre 2015

States in 26Na were populated in the (d, pγ) reaction, induced by bombarding deuterium target nuclei with an intense reaccelerated beam of 25Na ions from the ISAC2 accelerator at TRIUMF. Gamma-rays were recorded in coincidence with protons and used to extract differential cross sections for 21 (...)

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[in2p3-01243596] Finite-size effects on the phase diagram of the thermodynamical cluster model

16 décembre 2015

The thermodynamical cluster model is known to present a first-order liquid-gas phase transition in the idealized case of an uncharged, infinitely extended medium. However, in most practical applications of this model, the system is finite and charged. In this paper we study how the phase (...)

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[in2p3-01244049] Hyperons in neutron star matter within relativistic mean-field models

16 décembre 2015

Since the discovery of neutron stars with masses around 2M ⊙ the composition of matter in the central part of these massive stars has been intensively discussed. Within this paper we will (re)investigate the question of the appearance of hyperons. To that end we will perform parameter study (...)

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[in2p3-01213941] A highly stable atomic vector magnetometer based on free spin precession

15 décembre 2015

We present a magnetometer based on optically pumped Cs atoms that measures the magnitude and direction of a 1 $\mu$T magnetic field. Multiple circularly polarized laser beams were used to probe the free spin precession of the Cs atoms. The design was optimized for long-time stability and (...)

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[in2p3-00867220] Coulomb chronometry to probe the decay mechanism of hot nuclei

15 décembre 2015

In 129 Xe+ nat Sn central collisions from 8 to 25 MeV/A, the three-fragment exit channel occurs with a significant cross section. We show that these fragments arise from two successive binary splittings of a heavy composite system. The sequence of fragment production is determined. Strong (...)

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[in2p3-01235346] Monte Carlo MSM correction factors for control rod worth estimates in subcritical and near-critical fast neutron reactors

3 décembre 2015

The GUINEVERE project was launched in 2006, within the 6th Euratom Framework Program IP-EUROTRANS, in order to study the feasibility of transmutation in Accelerator Driven subcritical Systems (ADS). This zero-power facility hosted at the SCK·CEN site in Mol (Belgium) couples the fast subcritical (...)

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[in2p3-01163153] Unified treatment of subsaturation stellar matter at zero and finite temperature

24 novembre 2015

The standard variational derivation of stellar matter structure in the Wigner-Seitz approximation is generalized to the finite temperature situation where a wide distribution of different nuclear species can coexist in the same density and proton fraction condition, possibly out of (...)

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[in2p3-01226404] Heat capacity of the neutron star inner crust within an extended nuclear statistical equilibrium model

24 novembre 2015

Background: Superfluidity in the crust is a key ingredient for the cooling properties of proto-neutron stars. Present theoretical calculations employ the quasiparticle mean-field Hartree-Fock-Bogoliubov theory with temperature-dependent occupation numbers for the quasiparticle states. Purpose: (...)

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[in2p3-01140188] Measurement of a false electric dipole moment signal from $^{199}$Hg atoms exposed to an inhomogeneous magnetic field

18 novembre 2015

We report on the measurement of a Larmor frequency shift proportional to the electric-field strength for $^199\rm Hg$ atoms contained in a volume permeated with aligned magnetic and electric fields. This shift arises from the interplay between the inevitable magnetic field gradients and the (...)

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[in2p3-01120938] A device for simultaneous spin analysis of ultracold neutrons

18 novembre 2015

We report on the design and first tests of a device allowing for measurement of ultracold neutrons polarisation by means of the simultaneous analysis of the two spin components. The device was developed in the framework of the neutron electric dipole moment experiment at the Paul Scherrer (...)

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[in2p3-01226192] Intertwined orders from symmetry projected wavefunctions of repulsively interacting Fermi gases in optical lattices

10 novembre 2015

Unconventional strongly correlated phases of the repulsive Fermi-Hubbard model, which could be emulated by ultracold vapors loaded in optical lattices, are investigated by means of energy minimizations with quantum number projection before variation and without any assumed order parameter. In a (...)

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[in2p3-01166055] Result of the search for neutrinoless double-$\beta$ decay in $^{100}$Mo with the NEMO-3 experiment

9 novembre 2015

The NEMO-3 detector, which had been operating in the Modane Underground Laboratory from 2003 to 2010, was designed to search for neutrinoless double $\beta$ ($0\nu\beta\beta$) decay. We report final results of a search for $0\nu\beta\beta$ decays with $6.914$ kg of $^100$Mo using the entire (...)

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[in2p3-01199753] A revised experimental upper limit on the electric dipole moment of the neutron

6 novembre 2015

We present for the first time a detailed and comprehensive analysis of the experimental results that set the current world sensitivity limit on the magnitude of the electric dipole moment (EDM) of the neutron. We have extended and enhanced our earlier analysis to include recent developments in (...)

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[in2p3-01222563] Observation of isoscalar multipole strengths in exotic doubly-magic $^{56}$Ni in inelastic α scattering in inverse kinematics

31 octobre 2015

The Isoscalar Giant Monopole Resonance (ISGMR) and the Isoscalar Giant Dipole Resonance (ISGDR) compression modes have been studied in the doubly-magic unstable nucleus $^56$Ni. They were measured by inelastic α-particle scattering in inverse kinematics at 50 MeV/u with the MAYA active target at (...)

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[in2p3-01158954] Microscopic evaluation of the hypernuclear chart with $\Lambda$ hyperons

28 octobre 2015

We calculate the comprehensive hypernuclear chart for even-even hypernuclei with magic numbers of $\Lambda$'s (for Z $\leq$ 120 and $\Lambda \leq$70) and estimate the number of bound systems, considering the present uncertainties in the $\Lambda-$nucleon and $\Lambda-\Lambda$ interactions. We (...)

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[in2p3-01159876] Observation of gravitationally induced vertical striation of polarized ultracold neutrons by spin-echo spectroscopy

19 octobre 2015

We describe a spin-echo method for ultracold neutrons (UCNs) confined in a precession chamber and exposed to a $|B_0|=1~\text\mu T$ magnetic field. We have demonstrated that the analysis of UCN spin-echo resonance signals in combination with knowledge of the ambient magnetic field provides an (...)

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[in2p3-01213933] New findings on structure and production of $^{10}He$ from $^{11}Li$ with the (d,$^{3}He$) reaction

10 octobre 2015

We present the first missing mass spectrum of the unbound nucleus He10, measured at RIKEN using the Li11(d,He3) reaction at 50A MeV. He10 is believed to be a three-body He8+n+n resonance beyond the limit of nuclear binding. Our observation of a new decay branch, 6He+4n, and of a puzzling (...)

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[in2p3-01169555] Gravitational depolarization of ultracold neutrons: Comparison with data

9 octobre 2015

We compare the expected effects of so-called gravitationally enhanced depolarization of ultracold neutrons to measurements carried out in a spin-precession chamber exposed to a variety of vertical magnetic-field gradients. In particular, we have investigated the dependence upon these field (...)

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[in2p3-01179429] Isoscalar response of $^{68}$Ni to $\alpha$-particle and deuteron probes

3 septembre 2015

Isoscalar giant resonances have been measured in the unstable Ni68 nucleus using inelastic alpha and deuteron scattering at 50A MeV in inverse kinematics with the active target MAYA at GANIL. Using alpha scattering, the extracted isoscalar giant monopole resonance (ISGMR) centroid was (...)

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[in2p3-01177776] Experimental study of a high intensity radio-frequency cooler

23 juillet 2015

Within the framework of the DESIR/SPIRAL-2 project, a radio-frequency quadrupole cooler named SHIRaC has been studied. SHIRaC is a key device of SPIRAL-2, designed to enhance the beam quality required by DESIR. The preliminary study and development of this device has been carried out at (...)

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[in2p3-01102611] Hyperons in neutron star matter within relativistic mean-field models

22 juillet 2015

Since the discovery of neutron stars with masses around 2 solar masses the composition of matter in the central part of these massive stars has been intensively discussed. Within this paper we will (re)investigate the question of the appearance of hyperons. To that end we will perform an (...)

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[in2p3-01177675] Estimate of the reactivity of the VENUS-F subcritical configuration using a Monte Carlo MSM method

20 juillet 2015

The GUINEVERE project was launched in 2006 in order to study the feasibility of transmutation in Accelerator Driven subcritical Systems (ADS). This facility, hosted at the Belgian Nuclear Research Center SCK·CEN, couples the fast subcritical lead reactor VENUS-F with an external neutron source (...)

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[in2p3-01177619] The Billotron: a way to experimentally apprehend the subatomic world

18 juillet 2015

The Billotron is a device designed and built by the LPC Caen to illustrate the methods with which physicists are able to study the basic structure of matter, in particular the nucleus of the atom.

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[in2p3-01170130] Scintillation properties of N2 and CF4 and performances of a scintillating ionization chamber

18 juillet 2015

In this work, we studied the emission yields, decay times and coincidence resolving times (CRT) of two gases, nitrogen (N2) and tetrafluoromethane (CF4), used for particle detection in the context of fission products measurement. The setup was made of an ionization chamber and two (...)

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[in2p3-01163177] Tracking rare-isotope beams with microchannel plates

17 juillet 2015

A system of two microchannel-plate detectors has been successfully implemented for tracking projectile-fragmentation beams. The detectors provide interaction positions, angles, and arrival times of ions at the reaction target. The current design is an adaptation of an assembly used for (...)

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[in2p3-00785502] alpha-clustering effects in dissipative 12C+12C reactions at 95 MeV

1er juillet 2015

Dissipative 12C+12C reactions at 95 MeV are fully detected in charge with the GARFIELD and RCo apparatuses at LNL. A comparison to a dedicated Hauser-Feshbach calculation allows to select events which correspond, to a large extent, to the statistical evaporation of highly excited 24Mg, as well (...)

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[in2p3-00986921] Competition between fusion-evaporation and multifragmentation in central collisions in 58Ni+48Ca at 25A MeV

1er juillet 2015

The experimental data concerning the Ni-58+Ca-48 reaction at E-lab(Ni)=25A MeV, collected by using the CHIMERA 4 pi device, have been analyzed in order to investigate the competition among different reaction mechanisms for central collisions in the Fermi energy domain. As a main criterion for (...)

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[in2p3-01158512] Constraining interactions mediated by axion-like particles with ultracold neutrons

17 juin 2015

We report a new limit on a possible short range spin-dependent interaction from the precise measurement of the ratio of Larmor precession frequencies of stored ultracold neutrons and Hg-199 atoms confined in the same volume. The measurement was performed in a similar to 1 mu T vertical magnetic (...)

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[in2p3-01090228] Neutron occupancy of the 0d5/2 orbital and the N = 16 shell closure in 24O

13 juin 2015

One-neutron knockout from 24O leading to the first excited state in 23O has been measured for a proton target at a beam energy of 62 MeV/nucleon. The decay energy spectrum of the neutron unbound state of 23O was reconstructed from the measured four momenta of the 22O fragment and emitted (...)

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[in2p3-00879483] Proton computed tomography from multiple physics processes

12 juin 2015

Proton CT (pCT) nowadays aims at improving hadron therapy treatment planning by mapping the relative stopping power (RSP) of materials with respect to water. The RSP depends mainly on the electron density of the materials. The main information used is the energy of the protons. However, during (...)

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[in2p3-01017198] Zero degree measurements of 12C fragmentation at 95 MeV/nucleon on thin targets

11 juin 2015

During therapeutic treatments using ions such as carbon, nuclear interactions between the incident ions and nuclei present in organic tissues may occur, leading to the attenuation of the incident beam intensity and to the production of secondary light charged particles. As the biological dose (...)

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[in2p3-00858297] Structure of unbound neutron-rich $^{9}$He studied using single-neutron transfer

3 juin 2015

The 8He(d,p) reaction was studied in inverse kinematics at 15.4A MeV using the MUST2 Si-CsI array in order to shed light on the level structure of 9He. The well known 16O(d,p)17O reaction, performed here in reverse kinematics, was used as a test to validate the experimental methods. The 9He (...)

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[in2p3-00925064] Experimental study of the two-body spin-orbit force

2 juin 2015

Energies and spectroscopic factors of the first $7/2^-$, $3/2^-$, $1/2^-$ and $5/2^-$ states in the $^35$Si$_21$ nucleus were determined by means of the (d,p) transfer reaction in inverse kinematics at GANIL using the MUST2 and EXOGAM detectors. By comparing the spectroscopic information on the (...)

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[in2p3-00989772] Atomic site sensitive processes in low energy ion-dimer collisions

28 mai 2015

Electron capture processes for low energy Ar9+ ions colliding on Ar2 dimer targets are investigated, focusing attention on charge sharing as a function of molecule orientation and impact parameter. A preference in charge-asymmetric dissociation channels is observed, with a strong correlation (...)

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[in2p3-01084779] Resonances in C14 observed in the He4(10Be,α)Be10 reaction

20 mai 2015

The α(Be10,α)Be10 resonant scattering reaction has been measured at nine Be10 beam energies from 25 to 48 MeV, scanning out resonances in C14 from excitation energies of 13 to 24 MeV. Angular distribution measurements were used to assign the spin and parity of 5− to resonances at Ex=18.82(2) and (...)

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[in2p3-01109338] Exact ground state of strongly correlated electron systems from symmetry-entangled wave-functions

20 mai 2015

The four-site Hubbard model is considered from the exact diagonalisation and variational method points of view. It is shown that the exact ground-state can be recovered by a symmetry projected Slater determinant, irrespective of the interaction strength. This is in contrast to the Gutzwiller (...)

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[in2p3-01027507] Observation of a p-wave one-neutron halo configuration in 37Mg

20 mai 2015

Cross sections of 1n-removal reactions from the neutron-rich nucleus Mg37 on C and Pb targets and the parallel momentum distributions of the Mg37 residues from the C target have been measured at 240 MeV/nucleon. A combined analysis of these distinct nuclear- and Coulomb-dominated reaction data (...)

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[in2p3-01066044] In-medium effects for nuclear matter in the Fermi energy domain

20 mai 2015

We study nuclear stopping in central collisions for heavy-ion induced reactions in the Fermi energy domain, between $15$ and $100$ A\,\textrmMeV. Using the large dataset of exclusive measurements provided by the $4\pi$ array \emphINDRA, we determine the relative degree of stopping as a function (...)

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[hal-00974520] Non-statistical decay and $\alpha$-correlations in the $^{12}$C+$^{12}$C fusion-evaporation reaction at 95 MeV

20 mai 2015

Multiple alpha coincidence and correlations are studied in the reaction $^12$C+$^12$C at 95 MeV for fusion-evaporation events completely detected in charge. Two specific channels with Carbon and Oxygen residues in coincidence with $\alpha$-particles are addressed, which are associated with (...)

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[in2p3-01005736] Probing Nuclear forces beyond the drip-line using the mirror nuclei $^{16}$N and $^{16}$F

20 mai 2015

Radioactive beams of $^14$O and $^15$O were used to populate the resonant states 1/2$^+$, 5/2$^+$ and $0^-,1^-,2^-$ in the unbound $^15$F and $^16$F nuclei respectively by means of proton elastic scattering reactions in inverse kinematics. Based on their large proton spectroscopic factor (...)

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[in2p3-00977048] Deformation-Driven p-Wave Halos at the Drip Line: 31Ne

20 mai 2015

The halo structure of Ne31 is studied using 1n-removal reactions on C and Pb targets at 230 MeV/nucleon. A combined analysis of the cross sections of these nuclear and Coulomb dominated reactions that feed directly the Ne30 ground-state reveals Ne31 to have a small neutron separation energy, (...)

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[in2p3-00978296] In-medium nuclear cluster energies within the Extended Thomas-Fermi approach

20 mai 2015

A recently introduced analytical model for the nuclear density profile[1] is implemented in the Extended Thomas-Fermi (ETF) energy density functional. This allows to (i) shed a new light on the issue of the sign of surface symmetry energy in nuclear mass formulas, which is strongly related to (...)

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[in2p3-00839436] Characterization and performances of a monitoring ionization chamber dedicated to IBA-universal irradiation head for Pencil Beam Scanning

20 mai 2015

Every radiotherapy center has to be equipped with real-time beam monitoring devices. In 2008, the medical application group from the Laboratory of Corpuscular Physics (LPC Caen) developed an Ionization Chamber in collaboration with the company IBA (Ion Beam Applications). This monitoring device (...)

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[in2p3-00858656] Benchmarking geant4 nuclear models for hadron therapy with 95 MeV/nucleon carbon ions

20 mai 2015

In carbon therapy, the interaction of the incoming beam with human tissue may lead to the production of a large amount of nuclear fragments and secondary light particles. An accurate estimation of the biological dose on the tumor and the surrounding healthy tissue thus requires sophisticated (...)

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[in2p3-00857485] Clusterized nuclear matter in the (proto-)neutron star crust and the symmetry energy

20 mai 2015

Though generally agreed that the symmetry energy plays a dramatic role in determining the structure of neutron stars and the evolution of core-collapsing supernovae, little is known in what concerns its value away from normal nuclear matter density and, even more important, the correct (...)

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[hal-00737435] Nuclear multifragmentation time-scale and fluctuations of largest fragment size

20 mai 2015

Distributions of the largest fragment charge, Zmax, in multifragmentation reactions around the Fermi energy can be decomposed into a sum of a Gaussian and a Gumbel distribution, whereas at much higher or lower energies one or the other distribution is asymptotically dominant. We demonstrate the (...)

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[in2p3-00765510] Search for Superscreening effect in Superconductor

20 mai 2015

The decay of $^19$O($\beta^-$) and $^19$Ne($\beta^+$) implanted in niobium in its superconducting and metallic phase was measured using purified radioactive beams produced by the SPIRAL/GANIL facility. Half-lives and branching ratios measured in the two phases are consistent within one-sigma (...)

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[in2p3-00776595] Strangeness-driven phase transition in star matter

20 mai 2015

The phase diagram of a system constituted of neutrons, protons, $\Lambda$-hyperons and electrons is evaluated in the mean-field approximation in the complete three-dimensional space given by the baryon, lepton and strange charge. It is shown that the phase diagram at sub-saturation densities is (...)

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[in2p3-00782509] Effects of irradiation of energetic heavy ions on digital pulse shape analysis with silicon detectors

20 mai 2015

The next generation of 4π detector arrays for heavy ion studies will largely use Pulse Shape Analysis to push the performance of silicon detectors with respect to ion identification. Energy resolution and pulse shape identification capabilities of silicon detectors under prolonged irradiation by (...)

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[in2p3-00825301] Transformation between statistical ensembles in the modelling of nuclear fragmentation

20 mai 2015

We explore the conditions under which the particle number conservation constraint deforms the predictions of fragmentation observables as calculated in the grand canonical ensemble. We derive an analytical formula allowing to extract canonical results from a grand canonical calculation and vice (...)

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[in2p3-00778551] Isospin transport in 84Kr + 112,124Sn collisions at Fermi energies

20 mai 2015

Isotopically resolved fragments with Z =20 have been studied with high resolution telescopes in a test run for the FAZIA collaboration. The fragments were produced by the collision of a 84Kr beam at 35 MeV/nucleon with a n-rich (124Sn) and a n-poor (112Sn) target. The fragments, detected close (...)

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[in2p3-00951921] Investigation of double beta decay of 100Mo to excited states of 100Ru

20 mai 2015

Double beta decay of 100Mo to the excited states of daughter nuclei has been studied using a 600 cm3 low-background HPGe detector and an external source consisting of 2588 g of 97.5% enriched metallic 100Mo, which was formerly inside the NEMO-3 detector and used for the NEMO-3 measurements of (...)

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[in2p3-00868612] Electron shakeoff following the Β+ decay of trapped 35Ar+ ions

19 mai 2015

The electron shakeoff of $^35$Cl atoms resulting from the $\beta$$^+$ decay of $^35$Ar$^+$ ions has been investigated using a Paul trap coupled to a recoil-ion spectrometer. The charge-state distribution of the recoiling daughter nuclei is compared to theoretical calculations accounting for (...)

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[in2p3-01062292] Dynamic stabilization of the magnetic field surrounding the neutron electric dipole moment spectrometer at the Paul Scherrer Institute

19 mai 2015

The Surrounding Field Compensation (SFC) system described in this work is installed around the four-layer Mu-metal magnetic shield of the neutron electric dipole moment spectrometer located at the Paul Scherrer Institute. The SFC system reduces the DC component of the external magnetic field by (...)

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[in2p3-01110422] Production cross sections for intermediate mass fragments from dynamical and statistical decay of projectile-like fragments in $^{124}$Sn + $^{64}$Ni and $^{112}$Sn + $^{58}$Ni collisions at 35 A MeV

24 avril 2015

Background: In heavy-ion collisions at intermediate energies the production of light charged particles and intermediate mass fragments (IMFs) is due to different reaction mechanisms and different time scales, ranging from fast dynamical processes to statistical emission from the equilibrated (...)

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[in2p3-01079961] Interatomic Coulombic Decay as a New Source of Low Energy Electrons in slow Ion-Dimer Collisions

23 avril 2015

We provide the experimental evidence that the single electron capture process in slow collisions between O$^3+$ ions and neon dimer targets leads to an unexpected production of low-energy electrons. This production results from the interatomic Coulombic decay process, subsequent to inner shell (...)

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[in2p3-01130200] 12C+p resonant elastic scattering in the Maya active target

23 avril 2015

In a proof-of-principle measurement, the Maya active target detector was employed for a 12C(p, p) resonant elastic scattering experiment in inverse kinematics. The excitation energy region from 0 to 3MeV above the proton breakup threshold in 13N was investigated in a single measurement. By (...)

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[in2p3-01120218] Low-temperature technique of thin silicon ion implanted epitaxial detectors

23 avril 2015

A new technique of large-area thin ion implanted silicon detectors has been developed within the R&D performed by the FAZIA Collaboration. The essence of the technique is the application of a lowtemperature baking process instead of high-temperature annealing. This thermal treatment is (...)

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[hal-00821065] Constrained caloric curves and phase transition for hot nuclei

23 avril 2015

Simulations based on experimental data obtained from multifragmenting quasi-fused nuclei produced in central $^129$Xe + $^nat$Sn collisions have been used to deduce event by event freeze-out properties in the thermal excitation energy range 4-12 AMeV [Nucl. Phys. A809 (2008) 111]. From these (...)

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[in2p3-00951556] Transfer reactions in inverse kinematics: An experimental approach for fission investigations

23 avril 2015

Inelastic and multinucleon transfer reactions between a 238U beam, accelerated at 6.14 MeV/u, and a 12C target were used for the production of neutron-rich, fissioning systems from U to Cm. A Si telescope, devoted to the detection of the targetlike nuclei, provided a characterization of the (...)

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[in2p3-01067158] Quasiprojectile and intermediate velocity isotopic ratios for light fragments emitted in the Ar 36 +Ni 58 and Ni 58 +Ni 58 reactions between 32A and 84A MeV

23 avril 2015

Isotopic ratios for light fragments (Z≤4 ) emitted by the quasiprojectile (QP) and the mid-rapidity (MR) sources are investigated by the use of a slightly asymmetric system (Ar 36 +Ni 58 ) and a symmetric one (Ni 58 +Ni 58 ) for six energies between 32A and 84A MeV and three semiperipheral (...)

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[in2p3-00924885] Upgrade of the SPIRAL identification station for high-precision measurements of nuclear β decay

23 avril 2015

The low-energy identification station at SPIRAL (Système de Production d'Ions Radioactifs Accélérés en Ligne) has been upgraded for studying the β decays of short-lived radioactive isotopes and to perform high-precision half-life and branching-ratio measurements for superallowed Fermi and isospin (...)

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[in2p3-01090245] Performance of the reconstruction algorithms of the FIRST experiment pixel sensors vertex detector

23 avril 2015

Hadrontherapy treatments use charged particles (e.g. protons and carbon ions) to treat tumors. During a therapeutic treatment with carbon ions, the beam undergoes nuclear fragmentation processes giving rise to significant yields of secondary charged particles. An accurate prediction of these (...)

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[in2p3-00920222] Structure of $^{13}$Be probed via secondary beam reactions

23 avril 2015

The low-lying level structure of the unbound neutron-rich nucleus $^13$Be has been investigated via breakup on a carbon target of secondary beams of $^14,15$B at 35 MeV/nucleon. The coincident detection of the beam velocity $^12$Be fragments and neutrons permitted the invariant mass of the (...)

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[in2p3-00951103] Energy measurement and fragment identification using digital signals from partially depleted Si detectors

23 avril 2015

A study of identification properties of a Si-Si DE-E telescope exploiting an underdepleted residual-energy detector has been performed. Five different bias voltages have been used, one corresponding to full depletion, the others associated with a depleted layer ranging from 90% to 60% of the (...)

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[in2p3-00966956] The FAZIA project in Europe: R&D phase

23 avril 2015

The goal of the FAZIA Collaboration is the design of a new-generation 4π detector array for heavy-ion collisions with radioactive beams. This article summarizes the main results of the R&D phase, devoted to the search for significant improvements of the techniques for charge and mass (...)

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[in2p3-00875063] Isospin effects and symmetry energy studies with INDRA

23 avril 2015

The equation of state of asymmetric nuclear matter is still controversial, as predictions at subsaturation as well as above normal density widely diverge. We discuss several experimental results measured in heavy-ion collisions with the INDRA array in the incident energy range 5-80 MeV/nucleon. (...)

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[in2p3-01079065] A measurement of the neutron to 199Hg magnetic moment ratio

23 avril 2015

The neutron gyromagnetic ratio has been measured relative to that of the 199Hg atom with an uncertainty of 0.8 ppm. We employed an apparatus where ultracold neutrons and mercury atoms are stored in the same volume and report the result $\gamma_\rm n/\gamma_\rm Hg = (...)

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[in2p3-01133535] Space-charge effects in Penning ion traps

13 avril 2015

The influence of space-charge on ion cyclotron resonances and magnetron eigenfrequency in a gas-filled Penning ion trap has been investigated. Off-line measurements with 39 K + using the cooling trap of the WITCH retardation spectrometer-based setup at ISOLDE / CERN were performed. Experimental (...)

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[in2p3-01133546] Simulations of high intensity ion beam RFQ cooler for DESIR/SPIRAL 2: SHIRaC

20 mars 2015

SHIRaC is a buffer gas radiofrequency quadrupole cooler, part of SPIRAL 2 facility, at GANIL in France. It is designed to cool low energy ion beams with emittances up to 80 pi.mm.mrad and currents up to 1 mu A. It is devoted to reduce the beam parameters; less than 3 pi.mm.mrad of emittance and (...)

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[in2p3-01133570] Thermal properties of light nuclei from $^{12}$C+$^{12}$C fusion-evaporation reactions

20 mars 2015

The $^12$C+$^12$C reaction at 95 MeV has been studied through the complete charge identification of its products by means of the GARFIELD+RCo experimental set-up at INFN Laboratori Nazionali di Legnaro (LNL). In this paper, the first of a series of two, a comparison to a dedicated (...)

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[in2p3-01117025] Spectroscopic study of the exotic nucleus 25P

17 février 2015

Motivated by the importance of 25P for the two-proton decay of 26S and for searches of the mirror analog of the island of inversion near N = 16, we present the first predictions for the spectroscopy of the exotic isotope 25P obtained in the shell model, a potential model, and a (...)

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[in2p3-01089644] Evolution of fission-fragment mass distributions in the neutron-deficient lead region

28 janvier 2015

Low-energy β-delayed fission of At194,196 and Fr200,202 was studied in detail at the mass separator ISOLDE at CERN. The fission-fragment mass distributions of daughter nuclei Po194,196 and Rn202 indicate a triple-humped structure, marking the transition between asymmetric fission of Hg178,180 (...)

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[in2p3-01090724] Measurement of the parameter xi" in polarized muon decay and Implications on exotic couplings of the leptonic weak interaction

28 janvier 2015

The muon decay parameter ξ'' has been determined in a measurement of the longitudinal polarization of positrons emitted from polarized and depolarized muons. The result, ξ''=0.981±0.045stat±0.003syst, is consistent with the Standard Model prediction of unity, and provides an order of magnitude (...)

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[in2p3-00823240] An endoscopic detector for ultracold neutrons

28 janvier 2015

A new versatile detector for ultracold neutrons (UCN) has been built and operated which combines multi-pixel photon counters and GS10 lithium-doped scintillators. Such detectors can be very small and can be used to monitor UCN inside storage vessels or guides with negligible influence (of order (...)

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[in2p3-00824193] Densities and energies of nuclei in dilute matter at zero temperature

28 janvier 2015

We explore the ground-state properties of nuclear clusters embedded in a gas of nucleons with the help of Skyrme-Hartree-Fock microscopic calculations. Two alternative representations of clusters are introduced, namely coordinate-space and energy-space clusters. We parameterize their density (...)

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[in2p3-00960923] Simulation of ion behavior in an open three-dimensional Paul trap using a power series method

28 janvier 2015

Simulations of the dynamics of ions trapped in a Paul trap with terms in the potential up to the order 10 have been carried out. The power series method is used to solve numerically the equations of motion of the ions. The stability diagram has been studied and the buffer gas cooling has been (...)

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[in2p3-00943130] Two-neutron transfer reaction mechanisms in 12C(6He,4He)14C using a realistic three-body 6He model

28 janvier 2015

The reaction mechanisms of the two-neutron transfer reaction 12C(6He,4He) have been studied at Elab=30 MeV at the TRIUMF ISAC-II facility using the Silicon Highly-segmented Array for Reactions and Coulex (SHARC) charged-particle detector array. Optical potential parameters have been extracted (...)

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[in2p3-00912877] Search for Neutrinoless Double-Beta Decay of $^{100}$Mo with the NEMO-3 Detector

28 janvier 2015

We report the results of a search for the neutrinoless double-$\beta$ decay (0$\nu\beta\beta$) of $^100$Mo, using the NEMO-3 detector to reconstruct the full topology of the final state events. With an exposure of 34.7 kg.y, no evidence for the 0$\nu\beta\beta$ signal has been found, yielding a (...)

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[in2p3-01024125] Implementation of an imaging spectrometer for localization and identification of radioactive sources

28 janvier 2015

Spatial localization of radioactive sources is currently a main issue interesting nuclear industry as well as homeland security applications and can be achieved using gamma cameras. For several years, CEA LIST has been designing a new system, called GAMPIX, with improved sensitivity, (...)

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