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Accueil > Recherche & Enseignement

M. Franck Delaunay


Maître de conférences IUT UCBN


Groupe : Structure nucléaire


delaunay lpccaen.in2p3.fr


Tél : +33 2 31 45 25 43


 



PUBLICATIONS


[in2p3-01462156] DIVE in the cosmic web: voids with Delaunay Triangulation from discrete matter tracer distributions

8 février 2017

We present a novel parameter-free cosmological void finder (\textscdive, Delaunay TrIangulation Void findEr) based on Delaunay Triangulation (DT), which efficiently computes the empty spheres constrained by a discrete set of tracers. We define the spheres as DT voids, and describe their (...)

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[in2p3-01461292] Signatures of the Primordial Universe from Its Emptiness: Measurement of Baryon Acoustic Oscillations from Minima of the Density Field

8 février 2017

Sound waves from the primordial fluctuations of the Universe imprinted in the large-scale structure, called baryon acoustic oscillations (BAOs), can be used as standard rulers to measure the scale of the Universe. These oscillations have already been detected in the distribution of galaxies. (...)

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[hal-01448509] Element Selective Probe of the Ultra-Fast Magnetic Response to an Element Selective Excitation in Fe-Ni Compounds Using a Two-Color FEL Source

3 février 2017

The potential of the two-color mode implemented at the FERMI free-electron laser (FEL) source for pumping and probing selectively different atomic species has been demonstrated by time-resolved scattering experiments with permalloy (FeNi alloy) and NiFe 2 O 4 samples. We monitored the (...)

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[hal-01443654] Four-state magnetic configuration in a tri-layer asymmetric ring

24 janvier 2017

Ring-shaped multilayered sub-micron dots have potential for the development of non-volatile multi-bit devices. We show that a Co/Cu/FeNi asymmetric ring can take four distinct remanent magnetic states, each one stabilized by applying a magnetic field pulse along one of four in-plane orthogonal (...)

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[hal-01440693] Signatures of the Primordial Universe from Its Emptiness: Measurement of Baryon Acoustic Oscillations from Minima of the Density Field

20 janvier 2017

Sound waves from the primordial fluctuations of the Universe imprinted in the large-scale structure, called baryon acoustic oscillations (BAOs), can be used as standard rulers to measure the scale of the Universe. These oscillations have already been detected in the distribution of galaxies. (...)

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[hal-01378466] Model-based investigation of the circadian clock and cell cycle coupling in mouse embryonic fibroblasts: Prediction of RevErb-α up-regulation during mitosis

30 novembre 2016

Experimental observations have put in evidence autonomous self-sustained cir-cadian oscillators in most mammalian cells, and proved the existence of molecular links between the circadian clock and the cell cycle. Some mathematical models have also been built to assess conditions of control of (...)

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[in2p3-01394089] Experimental study of high-lying states in $^{28}$Mg using the resonant elastic scattering of α particles

8 novembre 2016

The excitation function of Mg28 above the α-decay threshold has been measured for the first time using the resonant scattering of α particles with the technique of a thick target in inverse kinematics. Thirteen new states are reported between Ex=15.5 and Ex=20.5 MeV, and suggestions for (...)

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[hal-01373037] A test field for Gaia. Radial velocity catalogue of stars in the South Ecliptic Pole

29 septembre 2016

Gaia is a space mission currently measuring the five astrometric parameters as well as spectrophotometry of at least 1 billion stars to G = 20.7 mag with unprecedented precision. The sixth parameter in phase space (radial velocity) is also measured thanks to medium-resolution spectroscopy being (...)

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[in2p3-01368398] A New Neutron Time-of-Flight Array for β-Decay Studies

19 septembre 2016

A new time-of-flight array for β-delayed neutron spectroscopy (En 5 MeV) is being developed with the aim of improved performance compared to existing arrays. We report on the status of this development, in particular the study of the n-γ discrimination quality with digital electronics, a (...)

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[in2p3-01367797] Interaction cross section study of the two-neutron halo nucleus $^{22}$C

16 septembre 2016

The interaction cross sections (σI) of the very neutron-rich carbon isotopes 19C, 20C and 22C have been measured on a carbon target at 307, 280, and 235MeV/nucleon, respectively. A σIof 1.280 ±0.023bwas obtained for 22C, significantly larger than for 19,20C, supporting the halo character of 22C. A (...)

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[hal-01323817] Temperature and field dependent magnetization in a sub-µm patterned Co/FeRh film studied by resonant x-ray scattering

3 juin 2016

We studied the temperature and field dependence of the magnetization in a Co/FeRh/MgO(001) film patterned into a matrix of sub-µm sized rectangles, using element selective resonant scattering of polarized soft x-rays. We show that it is possible to reverse partially the magnetization of the Co (...)

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[in2p3-01306171] $\alpha$ clustering in Ti isotopes: $^{40,44,48}$Ca + $\alpha$ resonant scattering

22 avril 2016

Measurements were made of the 4He(40,44,48Ca,α) resonant scattering reactions at 180° and up to Ec.m. ~ 11.5MeV, using the Thick Target Inverse Kinematics technique. These measurements are discussed, with a focus on assessing their usefulness for investigating α-clustering in medium mass (...)

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[in2p3-01301897] Spectroscopy of $^{17}$C via one-neutron knockout reaction

18 avril 2016

A spectroscopic study of 17C was performed via the one-neutron knockout reaction of 18C on a carbon target at RIKEN-RIBF. Three unbound states at excitation energies of 2.66(2), 3.16(5), and 3.97(3) MeV (preliminary) were observed. The energies are compared with shell-model calculations and (...)

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[in2p3-01297888] Study of $^{19}$C by One-Neutron Knockout

5 avril 2016

The spectroscopic structure of 19C, a prominent one-neutron halo nucleus, has been studied with a 20C secondary beam at 290 MeV/nucleon and a carbon target. Neutron-unbound states populated by the one-neutron knockout reaction were investigated by means of the invariant mass method. The (...)

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[in2p3-01297860] Spectroscopy of $^{17}$C via one-neutron knockout reaction

5 avril 2016

A spectroscopic study of 17C was performed via the one-neutron knockout reaction of 18C on a carbon target at RIKEN-RIBF. Three unbound states at excitation energies of 2.66(2), 3.16(5), and 3.97(3) MeV (preliminary) were observed. The energies are compared with shell-model calculations and (...)

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[hal-01297637] Time-of-Flight Collimated- and Compton-Cameras Development for Ion Beam Therapy Monitoring

5 avril 2016

In ion beam therapy, the increased energy deposition of ions towards the finite range in tissue (Bragg peak) allows a precise dose delivery. With the aim of optimizing the ion treatment effectiveness, a strict range monitoring is mandatory: different solutions have been explored, but an online (...)

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[in2p3-01285922] Nucleus $^{26}$O: A Barely Unbound System beyond the Drip Line

10 mars 2016

The unbound nucleus 26O has been investigated using invariant-mass spectroscopy following one-proton removal reaction from a 27F beam at 201 MeV/nucleon. The decay products, 24O and two neutrons, were detected in coincidence using the newly commissioned SAMURAI spectrometer at the RIKEN (...)

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[hal-01277514] Widely tunable two-colour seeded free-electron laser source for resonant-pump resonant-probe magnetic scattering

24 février 2016

The advent of free-electron laser (FEL) sources delivering two synchronized pulses of different wavelengths (or colours) has made available a whole range of novel pump–probe experiments. This communication describes a major step forward using a new configuration of the FERMI FEL-seeded source to (...)

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[insu-01270525] A 24 HR GLOBAL CAMPAIGN TO ASSESS PRECISION TIMING OF THE MILLISECOND PULSAR J1713+0747

9 février 2016

The radio millisecond pulsar J1713+0747 is regarded as one of the highest-precision clocks in the sky and is regularly timed for the purpose of detecting gravitational waves. The International Pulsar Timing Array Collaboration undertook a 24 hr global observation of PSR J1713+0747 in an effort (...)

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[in2p3-01164846] Construction and commissioning of a technological prototype of a high-granularity semi-digital hadronic calorimeter

8 février 2016

A large prototype of 1.3m3 was designed and built as a demonstrator of the semi-digital hadronic calorimeter (SDHCAL) concept proposed for the future ILC experiments. The prototype is a sampling hadronic calorimeter of 48 units. Each unit is built of an active layer made of 1m2 Glass Resistive (...)

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[hal-01240924] X-ray holographic imaging of magnetic order in meander domain structures

10 décembre 2015

We performed x-ray holography experiments using synchrotron radiation. By analyzing the scattering of coherent circularly polarized x-rays tuned at the Co-2p resonance, we imaged perpendicular magnetic domains in a Co/Pd multilayer. We compare results obtained for continuous and laterally (...)

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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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[in2p3-01213933] 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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[in2p3-01198949] Study of $^{19}$C by One-Neutron Knockout from $^{20}$C

15 septembre 2015

The present work aims at exploring neutron-unbound states of 19C via the one-neutron knockout reaction. The invariant mass measurement in inverse kinematics was carried out with a carbon target and a 20C secondary beam at 290 MeV/nucleon. The preliminary relative energy spectrum and the parallel (...)

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[in2p3-01198941] Invariant Mass Spectroscopy of $^{17}$C via One-neutron Knockout Reaction of $^{18}$C

14 septembre 2015

Unbound states in 17C were investigated via one-neutron knockout of 18C. The experiment was performed using SAMURAI spectrometer in RIBF at RIKEN. By invariant mass spectroscopy, three resonances were measured at excitation energies of 3.03(12), 2.74(3), and 4.03(6) MeV as preliminary results. (...)

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[in2p3-01198919] Missing mass spectroscopy of $^{8}$He and $^{10}$He by (d,$^{3}$He) reaction

14 septembre 2015

We present the first missing mass spectrum of the unbound system 10He obtained from one nucleon transfer $^11$Li(d,$^3$He) reaction at 50 A MeV. We found rather large yields for the $^6$He + 4n decay channel especially for higher excitation energy, which suggest the importance of the $^6$He + 4n (...)

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[in2p3-01196659] Measurement of the Isoscalar Monopole Response in the Neutron-Rich Nucleus $^{68}$Ni using the active target MAYA

10 septembre 2015

We report the measurement of the isoscalar monopole strength in the unstable nucleus $^68$Ni using inelastic alpha scattering at 50AMeV in inverse kinematics. This experiment has been performed at GANIL with LISE spectrometer using a dedicated detector: the active target MAYA. A part of the (...)

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

23 juillet 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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[in2p3-01163177] 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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[in2p3-01090228] Neutron occupancy of the 0d5/2 orbital and the N = 16 shell closure in 24O

3 juillet 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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[in2p3-01143243] Irreversible transformation of ferromagnetic ordered stripe domains in single-shot infrared-pump/resonant-x-ray-scattering-probe experiments

23 avril 2015

The evolution of a magnetic domain structure upon excitation by an intense, femtosecond infrared (IR) laser pulse has been investigated using single-shot based time-resolved resonant x-ray scattering at the x-ray free electron laser LCLS. A well-ordered stripe domain pattern as present in a (...)

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[in2p3-00135623] Probing the $^{8}$He ground state via the $^{8}$He(p,t)$^{6}$He reaction

23 avril 2015

The weakly-bound 8He nucleus exhibits a neutron halo or thick neutron skin and is generally considered to have an α+4n structure in its ground state, with the four valence neutrons each occupying 1p3/2 states outside the α core. The 8He(p,t)6He reaction is a sensitive probe of the ground state (...)

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[in2p3-00157522] Search for resonances in $^4$n, $^7$H and $^9$He via transfer reactions

23 avril 2015

Investigation of unbound nuclear systems 9He, 7H and 4n was performed at GANIL-SPIRAL using the 8He beam at 15.3 A MeV and a CD2 target. The missing mass spectra were deduced from kinetic energies and emission angles of light ejectiles detected by the Silicon array MUST. In addition to (...)

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[in2p3-00360249] Radiolytic oxidation of UO2 pellets doped with alpha-emitters (238/239Pu)

23 avril 2015

To assess the impact of alpha radiolysis of water on the oxidative dissolution of UO2 under anoxic conditions, two series of plutonium-doped samples (specific alpha activity 385 and 18 ) were fabricated, characterized and leached in water of varying complexity (pure water, carbonated water, (...)

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[ensl-00684723] Uncertainty and Spectrogram Geometry

23 avril 2015

Ultimate possibilities of localization for time-frequency representations are first reviewed from a joint perspective, evidencing that Heisenberg-type pointwise limits are not exclusive of sharp localization along trajectories in the plane. Spectrogram reassignment offers such a possibility (...)

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[in2p3-01098234] Onset of quenching of the giant dipole resonance at high excitation energies

1er avril 2015

The evolution of the giant dipole resonance (GDR) properties in nuclei of mass A=120 to 132 has been investigated in an excitation energy range between 150 and 270 MeV through the study of complete and nearly complete fusion reactions using Sn116 beams at 17A and 23A MeV from the cyclotron of (...)

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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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[in2p3-00912674] Soft X-Ray Magneto-Optics: Probing Magnetism by Resonant Scattering Experiments

13 octobre 2014

The most advanced X-ray sources (third generation synchrotrons, linear free-electron lasers and high-harmonic generation sources) widen the range of application of X-ray scattering techniques considerably. Beyond flux and brilliance, improvements in polarization tuneability, degree of coherence (...)

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[in2p3-00954720] IRMA-2 at SOLEIL: a set-up for magnetic and coherent scattering of polarized soft x-rays

13 octobre 2014

We have designed, built and tested a new instrument for soft x-ray scattering experiments. IRMA-2 is a UHV set-up for elastic and coherent scattering experiments developed at the SEXTANTS beamline of the SOLEIL synchrotron. Applications will be in the field of solid state physics, with emphasis (...)

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[in2p3-00724499] Femtosecond Single-Shot Imaging of Nanoscale Ferromagnetic Order in Co/Pd Multilayers Using Resonant X-Ray Holography

13 octobre 2014

We present the first single-shot images of ferromagnetic, nanoscale spin order taken with femtosecond x-ray pulses. X-ray-induced electron and spin dynamics can be outrun with pulses shorter than 80 fs in the investigated fluence regime, and no permanent aftereffects in the samples are observed (...)

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[in2p3-00713713] Magnetic imaging by Fourier transform holography using linearly polarized x-rays

13 octobre 2014

We present a method for imaging magnetic domains via x-ray Fourier transform holography at linearly polarized sources. Our approach is based on the separation of holographic mask and sample and on the Faraday rotation induced on the reference wave. We compare images of perpendicular magnetic (...)

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[in2p3-01044774] N=16 Spherical Shell Closure in O-24

24 juillet 2014

The unbound excited states of the neutron drip-line isotope O-24 have been investigated via the O-24(p, p')O-23 + n reaction in inverse kinematics at a beam energy of 62 MeV/nucleon. The decay energy spectrum of O-24* was reconstructed from the momenta of O-23 and the neutron. The spin parity (...)

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[in2p3-01017235] Neutron occupancy of 0d5/2 orbital in 24O

2 juillet 2014

The partial one-neutron removal cross section of 24O leading to the first excited state in 23O has been measured to be 65.7 ± 5.3 mb with a proton target in inverse kinematics at the beam energy of 62 MeV/nucleon. The decay energy spectrum of the neutron unbound state of 23O was reconstructed (...)

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Structure of 13Be probed via secondary-beam reactions

27 mars 2014

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

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A circadian clock transcription model for the personalization of cancer chronotherapy

23 janvier 2014

Circadian timing of anticancer medications has improved treatment tolerability and efficacy several-fold, yet with inter-subject variability. Using three C57BL/6-based mouse strains of both sexes, we identified three chronotoxicity classes, with distinct circadian toxicity patterns of (...)

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

18 décembre 2013

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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[in2p3-00867763] Development of a new neutron time-of-flight array for beta-decay studies

30 septembre 2013

The Nuclear Structure Group of LPC Caen is developing a new neutron time-of-flight detector array for structure studies. Our main physics interest is the investigation of beta-delayed neutron emission from neutron-rich nuclei, including the most exotic cases for which two or more neutrons are (...)

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[in2p3-00725470] Implications of LHCb measurements and future prospects

14 juin 2013

During 2011 the LHCb experiment at CERN collected 1.0 fb-1 of sqrts = 7 TeV pp collisions. Due to the large heavy quark production cross-sections, these data provide unprecedented samples of heavy flavoured hadrons. The first results from LHCb have made a significant impact on the flavour (...)

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[in2p3-00823225] Invariant Mass Spectroscopy of O-23 via the (p, p') Reaction in Inverse Kinematics

16 mai 2013

The neutron-rich oxygen isotope O-23 has been investigated via proton inelastic scattering on a liquid hydrogen target at 63.5 MeV/nucleon. The invariant mass method in inverse kinematics was employed to reconstruct the energy spectrum. A sharp resonance state was observed at 42(5) keV above (...)

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The N=16 Spherical Shell Closure in O-24

16 mai 2013

The unbound excited states of the most neutron-rich dripline oxygen isotope, O-24, have been investigated by using the O-24(p,p')O-24(*) reaction at the beam energy of 62 MeV/nucleon in inverse kinematics. The first and second unbound excited states of O-24 have been observed at MeV and MeV (...)

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[in2p3-00817042] Alpha cluster structure in 56Ni

23 avril 2013

The inelastic $\alpha$−scattering experiment on 56Ni in inverse kinematics was performed at an incident energy of 50 MeV/u at GANIL. A very high multiplicity for $\alpha$−particle emission was observed with our phase-space limited experimental set-up. The maximum observed multiplicity, which (...)

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[in2p3-00785481] The N = 16 spherical shell closure in 24O

6 février 2013

The unbound excited states of the neutron drip-line isotope 24O have been investigated via the 24O(p,p')23O+n reaction in inverse kinematics at a beam energy of 62 MeV/nucleon. The decay energy spectrum of 24O* was reconstructed from the momenta of 23O and the neutron. The spin-parity of the (...)

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[in2p3-00785471] Comment on "First Observation of Ground State Dineutron Decay: 16Be

6 février 2013

A recent measurement [Spyrou et al., PRL 108, 102501 (2012)] of the in-flight decay of 16Be into 14Be+n+n has been interpreted as the first case of dineutron emission. Here we point out that the inclusion of the n-n interaction neglected in the description of the direct three-body decay can (...)

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[in2p3-00730971] Neutron and charged particle identification by means of various detectors

11 septembre 2012

Identification methods for photons, neutrons and heavy ions by using scintillator and semiconductor detectors are discussed by stressing the advantages of signal digitization.

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[in2p3-00730399] Core excitations and narrow states beyond the proton dripline: The exotic nucleus 21Al

10 septembre 2012

We present the first predictions for the widths of resonance states in a so-far unobserved exotic isotope beyond the proton dripline, 21Al. For this purpose we employ mirror symmetry between the widths of low-lying resonance states and the asymptotic normalization coefficients (ANC) of their (...)

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N=16 Spherical Shell Closure in 24O

26 juillet 2012

The unbound excited states of the neutron drip-line isotope 24O have been investigated via the 24O(p,p′)23O+n reaction in inverse kinematics at a beam energy of 62 MeV/nucleon. The decay energy spectrum of 24O* was reconstructed from the momenta of 23O and the neutron. The spin parity of the (...)

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DNA microarray analysis and functional profile of pituitary transcriptome under core-clock protein BMAL1 control.

22 mai 2012

Although it is known to contain five cell types that synthesize and release hormones with a circadian pattern, the pituitary gland is poorly characterized as a circadian oscillator. By a differential microarray analysis, 252 genes were found to be differentially expressed in pituitaries from (...)

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[in2p3-00691968] The first 2 + excited state of 24O

27 avril 2012

The unbound excited states of the most neutron-rich dripline oxygen isotope, O (Z=8, N=16), have been investigated using the 24O(p, p′)O* reaction at the beam energy of 63 MeV/nucleon in inverse kinematics at RIKEN. The 24O beam was produced in the projectile-like fragmentation process of a 95 (...)

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[in2p3-00691885] Ground-state proton decay of 69Br and implications for the rp-process 68Se waiting-point

27 avril 2012

The first direct measurement of the proton separation energy, S p, for the proton-unbound nucleus 69Br is reported. Of interest is the exponential dependence of the 2p-capture rate on S p which can bypass the 68Se waiting-point in the astrophysical rp process. An analysis of the observed proton (...)

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Invariant Mass Spectroscopy of 23O via the (p, p′) Reaction in Inverse Kinematics

27 avril 2012

The neutron-rich oxygen isotope 23O has been investigated via proton inelastic scattering on a liquid hydrogen target at 63.5 MeV/nucleon. The invariant mass method in inverse kinematics was employed to reconstruct the energy spectrum. A sharp resonance state was observed at 42(5) keV above the (...)

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The N = 16 Spherical Shell Closure in 24O

27 avril 2012

The unbound excited states of the most neutron-rich dripline oxygen isotope, 24O, have been investigated by using the 24O(p, p′) 24O * reaction at the beam energy of 62 MeV/nucleon in inverse kinematics. The first and second unbound excited states of 24O have been observed at Mathematical (...)

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[in2p3-00662400] Low-lying neutron f p-shell intruder states in 27Ne

24 janvier 2012

The quenching of the N = 20 shell gap in neutron-rich nuclei is investigated by studying the single-particle structure of 27Ne via neutron transfer using a 26Ne beam. Two low-lying negative-parity intruder states have been observed, the lowest of which is identified as J π = 3/2−, confirming (...)

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Measurement of Unbound Excited States of (24)O

17 novembre 2011

The unbound excited states of the most neutron-rich oxygen isotope, (24)O (Z = 8, N = 16), have been investigated using the (24)O(p,p')(24)O*-->(23)O+n reaction at RIKEN, where a 63 MeV/neuclon secondary beam of (24)O was produced in a Be production target by the projectile-like (...)

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[in2p3-00642050] Measurement of Unbound Excited States of (24)O

17 novembre 2011

The unbound excited states of the most neutron-rich oxygen isotope, (24)O (Z = 8, N = 16), have been investigated using the (24)O(p,p')(24)O*-->(23)O+n reaction at RIKEN, where a 63 MeV/neuclon secondary beam of (24)O was produced in a Be production target by the projectile-like (...)

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Invariant Mass Spectroscopy for the Neutron Rich Nuclei

17 novembre 2011

The neutron-rich carbon isotopes (19,17)C and a boron isotope (14)B are investigated respectively via proton inelastic and charge-exchange reactions on a liquid hydrogen target at around 70 MeV/nucleon at RIKEN. The invariant mass method in inverse kinematics involving coincidence detection of (...)

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[in2p3-00642043] Invariant Mass Spectroscopy for the Neutron Rich Nuclei

17 novembre 2011

The neutron-rich carbon isotopes (19,17)C and a boron isotope (14)B are investigated respectively via proton inelastic and charge-exchange reactions on a liquid hydrogen target at around 70 MeV/nucleon at RIKEN. The invariant mass method in inverse kinematics involving coincidence detection of (...)

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Ground-State Proton Decay of 69Br and Implications for the 68Se Astrophysical Rapid Proton-Capture Process Waiting Point

6 septembre 2011

We report on the first direct measurement of the proton separation energy for the proton-unbound nucleus 69Br. Bypassing the 68Se waiting point in the rp process is directly related to the 2p-capture rate through 69Br, which depends exponentially on the proton separation energy. We find a (...)

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[in2p3-00606207] Ground-State Proton Decay of 69Br and Implications for the 68Se Astrophysical Rapid Proton-Capture Process Waiting Point

6 septembre 2011

We report on the first direct measurement of the proton separation energy for the proton-unbound nucleus 69Br. Bypassing the 68Se waiting point in the rp process is directly related to the 2p-capture rate through 69Br, which depends exponentially on the proton separation energy. We find a (...)

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Emergence of the N = 16 shell gap in $^{21}$O

11 juillet 2011

The spectroscopy of 21O has been investigated using a radioactive 20O beam and the (d,p) reaction in inverse kinematics. The ground and first excited states have been determined to be J π= 5/2+ and 1/2+, respectively. Two neutron unbound states were observed at excitation energies of 4.77(10) (...)

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Emergence of the N=16 shell gap in $^{21}$O

21 décembre 2010

The spectroscopy of 21O has been investigated using a radioactive 20O beam and the (d,p) reaction in inverse kinematics. The ground and first excited states have been determined to be Jpi=5/2+ and Jpi=1/2+ respectively. Two neutron unbound states were observed at excitation energies of 4.76 +- (...)

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[in2p3-00548964] Emergence of the N=16 shell gap in $^{21}$O

21 décembre 2010

The spectroscopy of 21O has been investigated using a radioactive 20O beam and the (d,p) reaction in inverse kinematics. The ground and first excited states have been determined to be Jpi=5/2+ and Jpi=1/2+ respectively. Two neutron unbound states were observed at excitation energies of 4.76 +- (...)

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Study of the $^{20}$O(d,t) reaction with the TIARA-MUST2-VAMOS-EXOGAM setup

6 janvier 2010

The reaction 20O(d,t) has been studied in inverse kinematics using a secondary ra- dioactive beam produced with the SPIRAL facility at GANIL. Fragments, light charged particles and gamma rays were measured with the TIARA, MUST2, VAMOS and EX- OGAM detectors and preliminary results are reported. (...)

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[in2p3-00444218] Study of the $^{20}$O(d,t) reaction with the TIARA-MUST2-VAMOS-EXOGAM setup

6 janvier 2010

The reaction 20O(d,t) has been studied in inverse kinematics using a secondary ra- dioactive beam produced with the SPIRAL facility at GANIL. Fragments, light charged particles and gamma rays were measured with the TIARA, MUST2, VAMOS and EX- OGAM detectors and preliminary results are reported. (...)

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Does transfer confirm knockout results for spectroscopic factor suppression with radioactive beams?

15 mai 2009

Proton removal measurements of the (e, e′p), (d,3He), and fast-beam knockout types show a consistent reduction of the spectroscopic factor when compared to shell model calculations [1-3]. The loss of single-particle strength is explained as the result of the short-range correlations between (...)

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[in2p3-00384521] Does transfer confirm knockout results for spectroscopic factor suppression with radioactive beams?

15 mai 2009

Proton removal measurements of the (e, e′p), (d,3He), and fast-beam knockout types show a consistent reduction of the spectroscopic factor when compared to shell model calculations [1-3]. The loss of single-particle strength is explained as the result of the short-range correlations between (...)

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On the measurement of B(E2, 0$^{+}$$_{1}$ -> 2$^{+}$$_{1}$) using intermediate-energy Coulomb excitation

6 novembre 2007

Coulomb excitation is a standard method used to extract quadrupole excitation strengths of even–even nuclei. In typical analyzes the reaction is assumed to be one step, Coulomb only, and is treated within a semi-classical model. In this work, fully quantal coupled-channel calculations are (...)

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[in2p3-00185471] On the measurement of B(E2, 0$^{+}$$_{1}$ -> 2$^{+}$$_{1}$) using intermediate-energy Coulomb excitation

6 novembre 2007

Coulomb excitation is a standard method used to extract quadrupole excitation strengths of even–even nuclei. In typical analyzes the reaction is assumed to be one step, Coulomb only, and is treated within a semi-classical model. In this work, fully quantal coupled-channel calculations are (...)

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