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Accueil > Recherche & Enseignement

M. Marc Labalme

Maître de conférences ENSICAEN

Groupe : Applications industrielles et médicales

labalme lpccaen.in2p3.fr

Tel : +33 2 31 45 25 17


PUBLICATIONS

[hal-01642875] Measurement of fragmentation cross sections of $^{12}$C ions on a thin gold target with the FIRST apparatus

22 novembre 2017

A detailed knowledge of the light ions interaction processes with matter is of great interest in basic and applied physics. As an example, particle therapy and space radioprotection require highly accurate fragmentation cross-section measurements to develop shielding materials and estimate (...)

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[hal-01642932] Performance of upstream interaction region detectors for the FIRST experiment at GSI

22 novembre 2017

The FIRST (Fragmentation of Ions Relevant for Space and Therapy) experiment at GSI has been designed to study carbon fragmentation, measuring (12)C double differential cross sections (- (2)I /- - E) for different beam energies between 100 and 1000 MeV/u. The experimental setup integrates newly (...)

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[hal-01642326] CMOS active pixel sensors response to low energy light ions

22 novembre 2017

Recently CMOS active pixel sensors have been used in Hadrontherapy ions fragmentation cross section measurements. Their main goal is to reconstruct tracks generated by the non interacting primary ions or by the produced fragments. In this framework the sensors, unexpectedly, demonstrated the (...)

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[hal-01641079] Measurement of fragmentation cross sections of $^{12}$C ions on a thin gold target with the FIRST apparatus

21 novembre 2017

A detailed knowledge of the light ions interaction processes with matter is of great interest in basic and applied physics. As an example, particle therapy and space radioprotection require highly accurate fragmentation cross-section measurements to develop shielding materials and estimate (...)

Lire la suite

[hal-01641136] Performance of upstream interaction region detectors for the FIRST experiment at GSI

21 novembre 2017

The FIRST (Fragmentation of Ions Relevant for Space and Therapy) experiment at GSI has been designed to study carbon fragmentation, measuring (12)C double differential cross sections (- (2)I /- - E) for different beam energies between 100 and 1000 MeV/u. The experimental setup integrates newly (...)

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[hal-01641869] Differential cross section measurements for hadron therapy: 50 MeV/nucleon $^{12}$C reactions on H, C, O, Al, and $^{nat}$Ti targets

21 novembre 2017

During a carbon therapy treatment, the beam undergoes inelastic nuclear reactions leading to the production of secondary fragments. These nuclear interactions tend to delocate a part of the dose into healthy tissues and create a mixed radiation field. In order to accurately estimate the dose (...)

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[hal-01642166] Cross section measurements for production of positron emitters for PET imaging in carbon therapy

21 novembre 2017

In light ion beam therapy, positron (β+) emitters are produced by the tissue nuclei through nuclear interactions with the beam ions. They can be used for the verification of the delivered dose using positron emission tomography by comparing the spatial distribution of the β+ emitters activity to (...)

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[hal-01642149] First tests of $^6$Li doped glass scintillators for ultracold neutron detection

21 novembre 2017

We report the results of test measurements aimed at determining the performances of 6 Li doped glass scintillators for the detection of ultra-cold neutrons. Four types of scintillators, GS1, GS3, GS10 and GS20, which differ by their 6 Li concentrations, have been tested. The signal to (...)

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[hal-01555145] Cross section measurements for production of positron emitters for PET imaging in carbon therapy

5 juillet 2017

In light ion beam therapy, positron (β+) emitters are produced by the tissue nuclei through nuclear interactions with the beam ions. They can be used for the verification of the delivered dose using positron emission tomography by comparing the spatial distribution of the β+ emitters activity to (...)

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[hal-01554548] Differential cross section measurements for hadron therapy: 50 MeV/nucleon $^{12}$C reactions on H, C, O, Al, and $^{nat}$Ti targets

5 juillet 2017

During a carbon therapy treatment, the beam undergoes inelastic nuclear reactions leading to the production of secondary fragments. These nuclear interactions tend to delocate a part of the dose into healthy tissues and create a mixed radiation field. In order to accurately estimate the dose (...)

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[in2p3-01334107] Measurement of fragmentation cross sections of C12 ions on a thin gold target with the FIRST apparatus

20 juin 2016

A detailed knowledge of the light ions interaction processes with matter is of great interest in basic and applied physics. As an example, particle therapy and space radioprotection require highly accurate fragmentation cross-section measurements to develop shielding materials and estimate (...)

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

1er juillet 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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[hal-00012793] Transport and cooling of singly-charged noble gas ion beams

1er juillet 2015

The transport and cooling of noble gas singly-charged ion beams by means of a Radio Frequency Quadrupole Cooler Buncher (RFQCB) have been studied at the LIMBE low energy beam line of the GANIL facility. Ions as light as $^4He^+$ have been cooled and stored before their extraction in bunches (...)

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[hal-01076321] Incidental findings on array comparative genomic hybridization detection of carrier females of dystrophinopathy without any family history

21 octobre 2014

Array comparative genomic hybridization aCGH has progressively replaced conventional karyotype in the diagnostic strategy of intellectual disability ID and congenital malformations This technique increases not only the diagnostic rate but also the possibility of finding unexpected variants (...)

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Observable analysis for proton computed tomography

22 juillet 2014

Proton CT (pCT) nowadays aims at improving hadron therapy treatment planning by mapping the electron density of materials. The main information used is the energy of the protons. However, during a pCT acquisition, the spatial and angular deviation of each particle is recorded and the (...)

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

2 juillet 2014

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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FIRST experiment: Fragmentation of Ions Relevant for Space and Therapy

10 janvier 2014

Nuclear fragmentation processes are relevant in different fields of basic research and applied physics and are of particular interest for tumor therapy and for space radiation protection applications. The FIRST (Fragmentation of Ions Relevant for Space and Therapy) experiment at SIS accelerator (...)

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Comparisons of hadrontherapy-relevant data to nuclear interaction codes in the Geant4 toolkit

10 janvier 2014

Comparisons between experimental data, INCL and other nuclear models available in the Geant4 toolkit are presented. The data used for the comparisons come from a fragmentation experiment realised at GANIL facility. The main purpose of this experiment was to measure production rates and angular (...)

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

4 novembre 2013

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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Simulation study on light ions identification methods for carbon beams from 95 to 400 MeV/A

1er octobre 2013

Monte Carlo simulations have been performed in order to evaluate the efficiencies of several light ions identification techniques. The detection system was composed with layers of scintillating material to measure either the deposited energy or the time-of-flight of ions produced by nuclear (...)

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

5 septembre 2013

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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[in2p3-00829487] Double differential fragmentation cross-section measurements of 95 MeV/u 12C on thin targets for hadrontherapy

3 juin 2013

During therapeutic treatment with heavy ions like carbon, the beam undergoes nuclear fragmentation and secondary light charged particles, in particular protons and alpha particles, are produced. To estimate the dose deposited into the tumors and the surrounding healthy tissues, an accurate (...)

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Nuclear Fragmentation Measurements for Hadrontherapy: 95MeV/u 12C Reactions on H, C, Al, O and nat Ti Targets

30 avril 2013

The interest for hadrontherapy, the use of ion beams for the treatments of cancerous tumors, is increasing. This can be attributed to the great accuracy of ion beams to target the tumor while sparing the surrounding healthy tissues (due to the high dose deposition in the Bragg peak and the (...)

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[in2p3-00806234] Comparison of two analysis methods for nuclear reaction measurements of 12C +12C interactions at 95 MeV/u for hadrontherapy

29 mars 2013

During therapeutic treatment with heavier ions like carbon, the beam undergoes nuclear fragmentation and secondary light charged particles, in particular protons and alpha particles, are produced. To estimate the dose deposited into the tumors and the surrounding healthy tissues, the accuracy (...)

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Nuclear Fragmentation Measurements for Hadrontherapy: 95MeV/u 12C Reactions on H, C, Al, O and natTi Targets

5 mars 2013

The interest for hadrontherapy, the use of ion beams for the treatments of cancerous tumors, is increasing. This can be attributed to the great accuracy of ion beams to target the tumor while sparing the surrounding healthy tissues (due to the high dose deposition in the Bragg peak and the (...)

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149 95MEV/U 12C Nuclear fragmentation measurements for hadrontherapy purposes

11 juin 2012

To keep the benefits of the precise ions ballistic, hadrontherapy treatments require a very high accuracy on the dose deposition. The largest uncertainty on physical dose relies on the ion fragmentation process. Up to now, the simulation codes are not able to reproduce the fragmentation process (...)

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The FIRST experiment for nuclear fragmentation measurements at GSI

27 avril 2012

Nuclear fragmentation processes are relevant in different fields of physics concerning both basic research and applications. FIRST (Fragmentation of Ions Relevant for Space and Therapy) is an experiment aimed at the measurement of double differential cross sections (DDCS), with respect to (...)

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[in2p3-00691811] The FIRST experiment at GSI

27 avril 2012

The FIRST (Fragmentation of Ions Relevant for Space and Therapy) experiment at the SIS accelerator of GSI laboratory in Darmstadt has been designed for the measurement of ion fragmentation cross-sections at different angles and energies between 100 and 1000. MeV/nucleon. Nuclear fragmentation (...)

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[in2p3-00676714] Performance of upstream interaction region detectors for the FIRST experiment at GSI

6 mars 2012

The FIRST (Fragmentation of Ions Relevant for Space and Therapy) experiment at GSI has been designed to study carbon fragmentation, measuring 12C double differential cross sections (∂2σ/∂θ∂E) for different beam energies between 100 and 1000 MeV/u. The experimental setup integrates newly designed (...)

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Characterization of a detection system for an anthropomorphic phantom designed to measure the effective dose for photon fields

28 février 2012

The Laboratory of Dosimetry for Ionizing Radiation at the Institute for Radiological Protection and Nuclear Safety in France is developing an instrumented anthropomorphic dummy to evaluate the effective dose for photon fields in workplaces. This anthropomorphic phantom will be equipped (...)

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Nuclear Physics and Hadron Therapy

17 février 2012

Hadron therapy uses light charged particles beams (mainly proton and 12C ions) to irradiate tumors. These beams present a ballistic advantage with a maximum energy deposition at the end of the path. A large dose can be delivered inside a deep tumor while the surrounding healthy tissues are (...)

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Nuclear reaction measurements of 95MeV/u 12C interactions on PMMA for hadrontherapy

6 septembre 2011

The ion dose deposition in tissues is characterized by a favorable depth dose profile (i.e. Bragg peak) and a small lateral spread. In order to keep these benefits of ions in cancer treatments, a very high accuracy is required on the dose deposition (±3%). For given target stoechiometry and (...)

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[in2p3-00619633] Nuclear reaction measurements of 95MeV/u 12C interactions on PMMA for hadrontherapy

6 septembre 2011

The ion dose deposition in tissues is characterized by a favorable depth dose profile (i.e. Bragg peak) and a small lateral spread. In order to keep these benefits of ions in cancer treatments, a very high accuracy is required on the dose deposition (±3%). For given target stoechiometry and (...)

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12C nuclear reaction measurements for hadrontherapy

21 janvier 2010

Hadrontherapy treatments require a very high precision on the dose deposition ( 2.5% and 1-2mm) in order to keep the benefits of the precise ions' ballistic. The largest uncertainty on the physical dose deposition is due to ion fragmentation. Up to now, the simulation codes are not able to (...)

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12C nuclear reaction measurements for hadrontherapy

21 janvier 2010

Hadrontherapy treatments require a very high precision on the dose deposition ( 2.5% and 1-2mm) in order to keep the benefits of the precise ions' ballistic. The largest uncertainty on the physical dose deposition is due to ion fragmentation. Up to now, the simulation codes are not able to (...)

Lire la suite

The LPCTrap for the measurement of the β-ν correlation in 6He

25 août 2009

The application of traps to precision measurements of the β-ν angular correlation coefficient a in nuclear β-decay is pursued by several laboratories world wide. Various nuclear transitions are addressed and different trap devices are used. At GANIL, a novel transparent Paul trap (LPCTrap) has (...)

Lire la suite

The LPCTrap for the measurement of the β-ν correlation in 6He

25 août 2009

The application of traps to precision measurements of the β-ν angular correlation coefficient a in nuclear β-decay is pursued by several laboratories world wide. Various nuclear transitions are addressed and different trap devices are used. At GANIL, a novel transparent Paul trap (LPCTrap) has (...)

Lire la suite

Search for tensor couplings in the weak interaction

27 janvier 2009

The existence of exotic couplings in the weak interaction can be tested by a precise measurement of the β-ν angular correlation parameter a in nuclear beta decay. In the case of 6He, the ratio of tensor and axial-vector couplings can be determined. The goal of the LPC Trap experiment is to (...)

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Search for tensor couplings in the weak interaction

27 janvier 2009

The existence of exotic couplings in the weak interaction can be tested by a precise measurement of the β-ν angular correlation parameter a in nuclear beta decay. In the case of 6He, the ratio of tensor and axial-vector couplings can be determined. The goal of the LPC Trap experiment is to (...)

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The DosiMap, a new 2D scintillating dosimeter for IMRT quality assurance: Characterization of two Cerenkov discrimination methods

21 janvier 2009

New radiation therapy techniques such as IMRT present significant efficiency due to their highly conformal dose distributions. A consequence of the complexity of their dose distributions (high gradients, small irradiation fields, low dose distribution, ...) is the requirement for better (...)

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[in2p3-00354893] The DosiMap, a new 2D scintillating dosimeter for IMRT quality assurance: Characterization of two Cerenkov discrimination methods

21 janvier 2009

New radiation therapy techniques such as IMRT present significant efficiency due to their highly conformal dose distributions. A consequence of the complexity of their dose distributions (high gradients, small irradiation fields, low dose distribution, ...) is the requirement for better (...)

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Comparative study of plastic scintillators for dosimetric applications

21 janvier 2009

Plastic scintillators are widely studied for radiotherapy dosimetry because of their very interesting properties and especially their water equivalence. Nevertheless, to ensure accurate dose measurements, the properties of the scintillators must be very well known and adapted to this (...)

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[in2p3-00354851] Comparative study of plastic scintillators for dosimetric applications

21 janvier 2009

Plastic scintillators are widely studied for radiotherapy dosimetry because of their very interesting properties and especially their water equivalence. Nevertheless, to ensure accurate dose measurements, the properties of the scintillators must be very well known and adapted to this (...)

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Status of the LPCTrap facility at GANIL

10 novembre 2008

The LPCTrap is a device whose central element is a transparent Paul trap for the efficient trapping of low energy radioactive ions produced by the SPIRAL facility at GANIL. The installation comprises a linear RFQ cooler and buncher for the beam preparation, and a decay chamber where the Paul (...)

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Status of the LPCTrap facility at GANIL

10 novembre 2008

The LPCTrap is a device whose central element is a transparent Paul trap for the efficient trapping of low energy radioactive ions produced by the SPIRAL facility at GANIL. The installation comprises a linear RFQ cooler and buncher for the beam preparation, and a decay chamber where the Paul (...)

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Paul trapping of radioactive $^{6}$He+ ions and direct observation of their beta-decay

17 octobre 2008

We demonstrate that abundant quantities of short-lived beta unstable ions can be trapped in a novel transparent Paul trap and that their decay products can directly be detected in coincidence. Low energy 6He+ (807 ms half-life) ions were extracted from the SPIRAL source at GANIL, then (...)

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[in2p3-00331783] Paul trapping of radioactive $^{6}$He+ ions and direct observation of their beta-decay

17 octobre 2008

We demonstrate that abundant quantities of short-lived beta unstable ions can be trapped in a novel transparent Paul trap and that their decay products can directly be detected in coincidence. Low energy 6He+ (807 ms half-life) ions were extracted from the SPIRAL source at GANIL, then (...)

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On-line monitoring of fluence distributions and imaging of scanning ion beams

25 février 2008

In this paper we describe the design of an ion beam monitor developed to control irradiations of biological samples with ions at GANIL (Grand Accélérateur National d'Ions Lourds). This device can be used as an on-line monitor to provide transverse fluence distributions for active scanning ion (...)

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[in2p3-00258718] On-line monitoring of fluence distributions and imaging of scanning ion beams

25 février 2008

In this paper we describe the design of an ion beam monitor developed to control irradiations of biological samples with ions at GANIL (Grand Accélérateur National d'Ions Lourds). This device can be used as an on-line monitor to provide transverse fluence distributions for active scanning ion (...)

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An On-line Monitor for Fluence Distributions and Imaging of Scanning Ion Beams

6 décembre 2007

Clinical applications of hadron beams have generated a wide development of radiobiology experiments, especially at GANIL (Grand Accélérateur National d'Ions Lourds), an ion accelerator in Caen. Biological samples are irradiated with ions in order to observe the induced biological effects. As (...)

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An On-line Monitor for Fluence Distributions and Imaging of Scanning Ion Beams

6 décembre 2007

Clinical applications of hadron beams have generated a wide development of radiobiology experiments, especially at GANIL (Grand Accélérateur National d'Ions Lourds), an ion accelerator in Caen. Biological samples are irradiated with ions in order to observe the induced biological effects. As (...)

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The LPCTrap experiment: measurement of the $\beta$–ν angular correlation in $^{6}$He using a transparent Paul trap

30 novembre 2007

We report on the status of the LPCTrap experiment, devoted to measure the β–ν angular correlation in the pure Gamow–Teller decay of $^6$He. This measurement is motivated by the search for the presence of tensor type contributions to the weak interaction. The $^6$He ions are confined in a novel (...)

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The LPCTrap experiment: measurement of the $\beta$–ν angular correlation in $^{6}$He using a transparent Paul trap

30 novembre 2007

We report on the status of the LPCTrap experiment, devoted to measure the β–ν angular correlation in the pure Gamow–Teller decay of $^6$He. This measurement is motivated by the search for the presence of tensor type contributions to the weak interaction. The $^6$He ions are confined in a novel (...)

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Scintillating fiber dosimeter

19 juillet 2007

Radiotherapy treatments become more and more accurate, using techniques like IMRT. Their irradiation fields and dose depositions are small and complex, and only a few dosimeters are available for real time and in vivo control for photons as well as for electrons beams. In this context, a new (...)

Lire la suite

Scintillating fiber dosimeter

19 juillet 2007

Radiotherapy treatments become more and more accurate, using techniques like IMRT. Their irradiation fields and dose depositions are small and complex, and only a few dosimeters are available for real time and in vivo control for photons as well as for electrons beams. In this context, a new (...)

Lire la suite

Heavy ion beams monitoring for radiobiology applications

19 juillet 2007

We describe the design and the construction of an on-line ion beam monitor. The device provides accurate measurements for radiobiology experiments currently held at GANIL (Grand Accélérateur National d'Ions Lourds) in France. A prototype named IBIS (Ion Beam Inspection System) has been tested at (...)

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Heavy ion beams monitoring for radiobiology applications

19 juillet 2007

We describe the design and the construction of an on-line ion beam monitor. The device provides accurate measurements for radiobiology experiments currently held at GANIL (Grand Accélérateur National d'Ions Lourds) in France. A prototype named IBIS (Ion Beam Inspection System) has been tested at (...)

Lire la suite

The LPCTrap facility for in-trap decay experiments

26 juin 2007

The LPCTrap is a device devoted to the determination of the angular correlation coefficient in the nuclear beta decay of $^6$He^+$ ions by detection of the electron and the recoil ion in coincidence in a Paul trap.The LPCTrap facility comprises an RFQ trap for beam preparation and a transparent (...)

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The LPCTrap facility for in-trap decay experiments

26 juin 2007

The LPCTrap is a device devoted to the determination of the angular correlation coefficient in the nuclear beta decay of $^6$He^+$ ions by detection of the electron and the recoil ion in coincidence in a Paul trap.The LPCTrap facility comprises an RFQ trap for beam preparation and a transparent (...)

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Spectral discrimination of Cerenkov radiation in scintillating dosimeters

21 novembre 2006

Radiation therapy accelerators require highly accurate dose deposition and the output must be monitored frequently and regularly. Ionization chambers are the primary tool for this control, but their size, their high voltage needed, and the correction needed for electrons make them unsuitable (...)

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[in2p3-00113799] Spectral discrimination of Cerenkov radiation in scintillating dosimeters

21 novembre 2006

Radiation therapy accelerators require highly accurate dose deposition and the output must be monitored frequently and regularly. Ionization chambers are the primary tool for this control, but their size, their high voltage needed, and the correction needed for electrons make them unsuitable (...)

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The LPCTrap facility for in-trap decay experiments

26 septembre 2006

The LPCTrap facility is coupled to the low-energy beam line LIRAT of the SPIRAL source at GANIL (France). The facility comprises an RFQ trap for beam preparation and a transparent Paul trap for in-trap decay studies. The system has been tested for several ion species. The Paul trap has been (...)

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The LPCTrap facility for in-trap decay experiments

26 septembre 2006

The LPCTrap facility is coupled to the low-energy beam line LIRAT of the SPIRAL source at GANIL (France). The facility comprises an RFQ trap for beam preparation and a transparent Paul trap for in-trap decay studies. The system has been tested for several ion species. The Paul trap has been (...)

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Measurement of the β−ν correlation in 6He using a transparent Paul trap

15 septembre 2006

The angular correlationbetween the electron and the neutrino in nuclear β−decay constitutes a sensitive observable to search for the existence of exotic couplings in the weak interaction. In this contribution, we describe the progress of the LPCTrap experiment, devoted to measure the β−ν angular (...)

Lire la suite

Measurement of the β−ν correlation in 6He using a transparent Paul trap

15 septembre 2006

The angular correlationbetween the electron and the neutrino in nuclear β−decay constitutes a sensitive observable to search for the existence of exotic couplings in the weak interaction. In this contribution, we describe the progress of the LPCTrap experiment, devoted to measure the β−ν angular (...)

Lire la suite

Linear radio frequency quadrupole for the cooling and bunching of radioactive ion beams

8 septembre 2006

A linear radio frequency quadrupole has been built for the transport, cooling, and bunching of radioactive ions extracted from an ECR source. The device uses the buffer gas cooling technique and was designed such as to extend the technique for the cooling of very light ions using H2 as buffer (...)

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[in2p3-00092266] Linear radio frequency quadrupole for the cooling and bunching of radioactive ion beams

8 septembre 2006

A linear radio frequency quadrupole has been built for the transport, cooling, and bunching of radioactive ions extracted from an ECR source. The device uses the buffer gas cooling technique and was designed such as to extend the technique for the cooling of very light ions using H2 as buffer (...)

Lire la suite

The LPCTrap facility: A novel transparent Paul trap for high-precision experiments

7 septembre 2006

A trap system has been built to perform high-precision β-decay experiments. The system is coupled to the low-energy beam line of the SPIRAL source at GANIL. The continuous ion beam from SPIRAL with energies between 10 and 20 keV is slowed down by means of a buffer-gas-filled RFQ trap and ejected (...)

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[in2p3-00091845] The LPCTrap facility: A novel transparent Paul trap for high-precision experiments

7 septembre 2006

A trap system has been built to perform high-precision β-decay experiments. The system is coupled to the low-energy beam line of the SPIRAL source at GANIL. The continuous ion beam from SPIRAL with energies between 10 and 20 keV is slowed down by means of a buffer-gas-filled RFQ trap and ejected (...)

Lire la suite

A new scintillating fiber dosimeter using a single optical fiber and a CCD camera

23 août 2006

Radiotherapy treatments become more and more accurate, using very small irradiation fields and complex dose depositions. So small dosimeters for real time and in vivo dosimetry, suitable for photons as well as for electrons beams are highly desired. In this context, a scintillating fiber (...)

Lire la suite

[in2p3-00089774] A new scintillating fiber dosimeter using a single optical fiber and a CCD camera

23 août 2006

Radiotherapy treatments become more and more accurate, using very small irradiation fields and complex dose depositions. So small dosimeters for real time and in vivo dosimetry, suitable for photons as well as for electrons beams are highly desired. In this context, a scintillating fiber (...)

Lire la suite

First tests of Li-6 doped glass scintillators for ultracold neutron detection.

17 février 2006

We report the results of test measurements aimed at determining the performances of [.sup.6]Li doped glass scintillators for the detection of ultra-cold neutrons. Four types of scintillators, GS1, GS3, GS10 and GS20, which differ by their [.sup.6]Li concentrations, have been tested. The signal (...)

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First tests of Li-6 doped glass scintillators for ultracold neutron detection.

17 février 2006

We report the results of test measurements aimed at determining the performances of [.sup.6]Li doped glass scintillators for the detection of ultra-cold neutrons. Four types of scintillators, GS1, GS3, GS10 and GS20, which differ by their [.sup.6]Li concentrations, have been tested. The signal (...)

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The LPCTrap for the measurement of the $\beta$-v correlation in $^{6}$He

8 novembre 2005

The application of traps to precision measurements of the $\beta$-ν angular correlation coefficient a in nuclear $\beta$-decay is pursued by several laboratories world wide. Various nuclear transitions are addressed and different trap devices are used. At GANIL, a novel transparent Paul trap (...)

Lire la suite

The LPCTrap for the measurement of the $\beta$-v correlation in $^{6}$He

8 novembre 2005

The application of traps to precision measurements of the $\beta$-ν angular correlation coefficient a in nuclear $\beta$-decay is pursued by several laboratories world wide. Various nuclear transitions are addressed and different trap devices are used. At GANIL, a novel transparent Paul trap (...)

Lire la suite

Transport and cooling of singly-charged noble gas ion beams

27 octobre 2005

The transport and cooling of noble gas singly-charged ion beams by means of a Radio Frequency Quadrupole Cooler Buncher (RFQCB) have been studied at the LIMBE low energy beam line of the GANIL facility. Ions as light as $^4He^+$ have been cooled and stored before their extraction in bunches (...)

Lire la suite

Transport and cooling of singly-charged noble gas ion beams

27 octobre 2005

The transport and cooling of noble gas singly-charged ion beams by means of a Radio Frequency Quadrupole Cooler Buncher (RFQCB) have been studied at the LIMBE low energy beam line of the GANIL facility. Ions as light as $^4He^+$ have been cooled and stored before their extraction in bunches (...)

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Performance of a micro-channel plates position sensitive detector

10 octobre 2005

The absolute detection efficiency of large area micro-channel plates (MCPs) detectors has been measured with $^6$Li$^+$ and $^23$Na$^+$ ions in the 0.5–7.5 keV energy range. Two detectors of 47mm and 83mm active diameter have been tested. They consist in a pair of MCPs mounted in a chevron (...)

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[in2p3-00024846] Performance of a micro-channel plates position sensitive detector

10 octobre 2005

The absolute detection efficiency of large area micro-channel plates (MCPs) detectors has been measured with $^6$Li$^+$ and $^23$Na$^+$ ions in the 0.5–7.5 keV energy range. Two detectors of 47mm and 83mm active diameter have been tested. They consist in a pair of MCPs mounted in a chevron (...)

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Measurements of the $\beta nu$ angular correlation in nuclear $\beta$-decay

26 avril 2005

The angular correlation between the electron and the neutrino in nuclear β-decay constitutes a sensitive observable to search for exotic couplings in the weak interaction. This correlation provides also an alternative means to determine the ratio between the Gamow-Teller and Fermi contributions (...)

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Measurements of the $\beta nu$ angular correlation in nuclear $\beta$-decay

26 avril 2005

The angular correlation between the electron and the neutrino in nuclear β-decay constitutes a sensitive observable to search for exotic couplings in the weak interaction. This correlation provides also an alternative means to determine the ratio between the Gamow-Teller and Fermi contributions (...)

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