Search

Your search keyword '"J. E. Sauvestre"' showing total 25 results
Start Over Author "J. E. Sauvestre" Topic physics
25 results on '"J. E. Sauvestre"'

1. Geant4 physics processes for microdosimetry simulation: Very low energy electromagnetic models for electrons in silicon

Author

Philippe Paillet, A. Valentin, Melanie Raine, Marc Gaillardin, J. E. Sauvestre, Laboratoire des Sciences des Procédés et des Matériaux (LSPM), Institut Galilée-Université Sorbonne Paris Cité (USPC)-Centre National de la Recherche Scientifique (CNRS)-Université Sorbonne Paris Nord, DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)

Subjects
Nuclear and High Energy Physics, Silicon, Physics::Instrumentation and Detectors, chemistry.chemical_element, 02 engineering and technology, Electron, 7. Clean energy, 01 natural sciences, [SPI.MAT]Engineering Sciences [physics]/Materials, Nuclear physics, Low energy, Calculated data, 0103 physical sciences, Incident energy, [SPI.GPROC]Engineering Sciences [physics]/Chemical and Process Engineering, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, Instrumentation, ComputingMilieux_MISCELLANEOUS, Physics, Range (particle radiation), 010308 nuclear & particles physics, Function (mathematics), 021001 nanoscience & nanotechnology, [SPI.TRON]Engineering Sciences [physics]/Electronics, chemistry, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Electromagnetic model, 0210 nano-technology
Abstract

The Energy-Loss Function (ELF) of silicon is used to calculate differential and total inelastic cross-sections of incident electrons. The model is validated in the 50 eV–50 keV incident energy range by comparing the inelastic cross-sections, stopping powers, and ranges to experimental and calculated data from the literature. It is applicable down to 16.7 eV. The cross sections are then used to simulate low-energy electron tracks in silicon with Geant4, using a similar implementation as the Geant4-DNA extension; this new Geant4 extension is called MuElec. Generation of low-energy electrons is clearly seen. The obtained ranges are consistent with experimental data.

Published
2012
Full Text
View/download PDF

2. Evidence for a Radiation Induced Electromotive Force (RIEMF) in Dielectrics Exposed to Very High 14 MeV Neutron Flux by Means of Neutron Induced Recoils

Author

V. Yu. Glebov, J.-E. Sauvestre, Jean-Luc Leray, and S. Bazzoli

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Electromotive force, Physics::Instrumentation and Detectors, Flux, Nuclear physics, Nuclear Energy and Engineering, Neutron flux, Neutron, Electric potential, Electrical and Electronic Engineering, Coaxial, Inertial confinement fusion
Abstract

To assess phenomena occurring in coaxial cables under high flux of 14 MeV neutrons in D-T fusion experiments, a polyethylene, Teflontrade or vacuum sandwiched between two electrodes mock-up is proposed. This Mock-Up was exposed to the subnanosecond flux at the LLE OMEGA facility in Rochester (above 1018 n/cm2-s) normally to the electrodes or with a tilt angle. A radiation induced current probing a radiation induced electromotive force (RIEMF) is measured and a model is proposed based on the range of the neutron-induced recoils. The GEANT4 simulation toolkit has been used to take advantage of the implementation of both nuclear and electromagnetic processes in order to compute the tracks and the strong angle dependence. Good agreements between simulations and experimental results are found for polyethylene in contrast with Teflontrade where the 3-alpha break-up of 12C not considered in GEANT4 seems to make a major contribution to the measured induced current. Comparison with the photon flux is made.

Published
2008
Full Text
View/download PDF

3. Fragmentation of 95 MeV/u 12C and 75 MeV/u 13C. Application to secondary-beam production

Author

P. Roussel-Chomaz, F. Clapier, M. Mirea, J. E. Sauvestre, T. Ethvignot, M. Lewitowicz, C. Cabot, Yang Yong Feng, R. Anne, M. G. Saint-Laurent, G. Fares, R. Bimbot, P. Delbourgo-Salvador, A. Lefebvre, S. Hachem, J. L. Sida, T. Benfoughal, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
25.70.Mn, 29.90.+ r, Nuclear and High Energy Physics, Silicon, Gaussian, Nuclear Theory, Hadron, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Other topics in elementary-particle and nuclear physics experimental methods and instrumentation, 01 natural sciences, 7. Clean energy, law.invention, Telescope, Nuclear physics, symbols.namesake, law, 0103 physical sciences, Nuclear fusion, Nuclear Experiment, 010306 general physics, Physics, Spectrometer, 010308 nuclear & particles physics, Exponential function, chemistry, Projectile and target fragmentation, symbols, Atomic physics
Abstract

The fragmentation of 95 MeV/u 12C and 75 MeV/u 13C projectiles, interacting with natural targets of different elements (9Be, $^{\rm nat}$ Cu and 197Au for 12C, and 9Be, $^{\rm nat}$ Ni, and 181Ta for 13C) and of various thicknesses has been investigated at GANIL, using the doubly achromatic magnetic spectrometer LISE. The projectile-like fragments transmitted at 0 $^\circ$ have been analysed using a silicon $\Delta E$ -E telescope and the $\Delta E$ -time-of-flight method. The results obtained with the thinnest targets are discussed in the scope of radioactive nuclear beam production. The fragment momentum distributions can be fitted by Gaussian peaks associated with exponential tails towards low momentum values. The experimental production yields are compared with the results of the simulation code LISE. It appears that this code reproduces satisfactorily the yields of nuclei close to the stability line, but strongly overestimates the production of very neutron-deficient nuclei.

Published
2004
Full Text
View/download PDF

4. Erratum to 'Beta decay half-lives of neutron rich Ti–Co isotopes around N=40' [Nucl. Phys. A 660 (1999) 3–19]

Author

F. de Oliveira Santos, C. Borcea, F. Pougheon, Karl Kratz, M. G. Saint-Laurent, L. Petizon, Eric Chabanat, O. Sorlin, C. Longour, R. Béraud, A. Emsallem, G. Canchel, M. J. Lopez, Leif Axelsson, M. Lewitowicz, M. Belleguic, J. E. Sauvestre, J. M. Daugas, C. Donzaud, S. Leenhardt, M. Girod, B. Pfeiffer, D. Guillemaud-Mueller, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Isotopes of chromium, 010308 nuclear & particles physics, Context (language use), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Beta decay, Isotopes of vanadium, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Isotopes of cobalt, Radioactive decay
Abstract

The neutron-rich 57−59 Ti, 59−62 V, 61−64 Cr, 63−66 Mn, 65−68 Fe, 67−70 Co have been produced at GANIL via interactions of a 60.4 MeV/u 86 Kr 34+ with a 58 Ni target. They have been separated by the doubly achromatic spectrometer LISE3. Beta-decay half-lives have been determined for all produced nuclei, and subsequent γ -rays have been observed for the most efficiently produced nuclei. The measured half-lives of vanadium and chromium isotopes are compared to QRPA calculations using ground states deformations from the FRDM or ETFSI models. In an astrophysical context, the short half-lives of 58 Ti and 64 Cr indicate that these nuclei are potential r-process progenitors, after β -decay, of 58 Fe and 64 Ni in certain inclusions of meteorites.

Published
2000
Full Text
View/download PDF

5. Beta decay half-lives of neutron rich Ti–Co isotopes around

Author

O. Sorlin, Leif Axelsson, G. Canchel, C. Donzaud, J. M. Daugas, M. Lewitowicz, D. Guillemaud-Mueller, J. E. Sauvestre, M. G. Saint-Laurent, Eric Chabanat, A. Emsallem, C. Longour, R. Béraud, Karl Kratz, C. Borcea, L. Petizon, B. Pfeiffer, M. J. Lopez, S. Leenhardt, M. Belleguic, F. Pougheon, and F. de Oliveira Santos

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Isotopes of chromium, Isotope, Isotopes of vanadium, Analytical chemistry, Neutron, Context (language use), Atomic physics, Beta decay, Radioactive decay
Abstract

The neutron-rich 57 – 59 Ti, 59 – 62 V, 61 – 64 Cr, 63 – 66 Mn, 65 – 68 Fe, 67 – 70 Co have been produced at GANIL via interactions of a 60.4 MeV/u 86 Kr 34+ with a 58 Ni target. They have been separated by the doubly achromatic spectrometer LISE3. Beta-decay half-lives have been determined for all produced nuclei, and subsequent γ -rays have been observed for the most efficiently produced nuclei. The measured half-lives of vanadium and chromium isotopes are compared to QRPA calculations using ground states deformations from the FRDM or ETFSI models. In an astrophysical context, the short half-lives of 58 Ti and 64 Cr indicate that these nuclei are potential r-process progenitors, after β -decay, of 58 Fe and 64 Ni in certain inclusions of meteorites.

Published
1999
Full Text
View/download PDF

6. Study of μs-isomers in neutron-rich nuclei around Z=28 and N=40 shell closures

Author

K. L. Jones, A. Nowak, Robert Grzywacz, W. Trinder, W. N. Catford, S. Viteritti, M. Houry, M. Glogowski, M. Sawicka, M. G. Saint-Laurent, J. C. Angélique, G. Sletten, J. Szerypo, R. Bentida, L. Achouri, A.C. Mueller, A. Płochocki, O. Sorlin, J. M. Daugas, C. Borcea, M. Stanoiu, D. Baiborodin, J. S. Winfield, M. Pfützner, K. Rykaczewski, A. Emsallem, M. Schaefer, R.C. Lemmon, P. H. Regan, D. Guillemaud-Mueller, R. Béraud, S. Hurskanen, J. E. Sauvestre, H. Grawe, F. De Oliveira-Santos, C. R. Bingham, M. Lewitowicz, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, 0103 physical sciences, Shell (structure), Neutron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 01 natural sciences
Abstract

NESTER

Published
1999
Full Text
View/download PDF

7. New Island ofμsIsomers in Neutron-Rich Nuclei around theZ=28andN=40Shell Closures

Author

A. Płochocki, Andrzej Nowak, M. Pfützner, D. Guillemaud-Mueller, S. Viteritti, M. G. Saint-Laurent, J. Szerypo, K. P. Rykaczewski, M. Glogowski, H. Grawe, Morten Hjorth-Jensen, M. Lewitowicz, M. Houry, W. Trinder, J. E. Sauvestre, O. Sorlin, R. Béraud, Robert Grzywacz, A.C. Mueller, C. Borcea, J. S. Winfield, A. Emsallem, and M. Schaefer

Subjects
Nuclear physics, Physics, 010308 nuclear & particles physics, 0103 physical sciences, Shell (structure), General Physics and Astronomy, Neutron, Atomic physics, 010306 general physics, 01 natural sciences
Published
1998
Full Text
View/download PDF

8. Isomeric states in 66As

Author

S. Andriamonje, F. Davi, A. Musquère, J. E. Sauvestre, B. Blank, M. Lewitowicz, C. Donzaud, Andreas Martin Heinz, F. Boué, Arnd R. Junghans, M. Karny, A. Grewe, H. Grawe, A. Fleury, Z. Janas, R. Del Moral, M.S. Pravikoff, M. Pfützner, S. Czajkowski, K. Sümmerer, Robert Grzywacz, J.P. Dufour, M. G. Porquet, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Decay scheme, Spectrometer, 010308 nuclear & particles physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, medicine.anatomical_structure, Fragmentation (mass spectrometry), 0103 physical sciences, medicine, Atomic physics, 010306 general physics, Nucleus, Excitation
Abstract

Two new isomeric states in the self-conjugate nucleus 66As have been observed at the final focus of the LISE3 spectrometer at GANIL. The nucleus has been produced in a fragmentation reaction of 78Kr at 73A MeV. The 66m1,m2As isomeric levels are placed at excitation energies of E ∗m1 =3023.9 keV and E ∗m2 =1356.7 keV. Half-lives of T1/2m1=17.5(15) μs and T1/2m2=1.9(5) μs have been measured for the isomers and a decay scheme has been established.

Published
1998
Full Text
View/download PDF

9. New Isotopes fromK78rFragmentation and the Ending Point of the Astrophysical Rapid-Proton-Capture Process

Author

F. Davi, A. Grewe, J. E. Sauvestre, Robert Grzywacz, A. Fleury, R. Del Moral, A. Musquère, J.P. Dufour, M. Pfützner, B. Blank, M. Lewitowicz, S. Andriamonje, Arnd R. Junghans, A. Heinz, Z. Janas, C. Donzaud, M.S. Pravikoff, and S. Czajkowski

Subjects
Physics, Proton, Isotope, 010308 nuclear & particles physics, Nuclear Theory, General Physics and Astronomy, rp-process, 01 natural sciences, Nuclear physics, Fragmentation (mass spectrometry), Isotopes of bromine, 0103 physical sciences, Nuclear Experiment, 010306 general physics, Nucleon, Projectile fragmentation
Abstract

In an experiment at the SISSI/LISE facility of GANIL, we used the projectile fragmentation of a ${}^{78}\mathrm{Kr}$ primary beam at 73 MeV/nucleon to produce new isotopes of astrophysical interest. We obtained clear evidence for the existence of the five new isotopes ${}^{60}\mathrm{Ga}$, ${}^{64}\mathrm{As}$, ${}^{69,70}\mathrm{Kr}$, and ${}^{74}\mathrm{Sr}$. However, we did not find any evidence for ${}^{69}\mathrm{Br}$, whereas comparable nuclei were observed with more than 1000 counts. The isotope ${}^{69}\mathrm{Br}$ is thus deduced to be a proton-unbound nucleus with a half-life shorter than about 100 ns. The influence of these results on our understanding of the astrophysical RP process is discussed.

Published
1995
Full Text
View/download PDF

10. Production of a pure isomeric beam

Author

T. Ethvignot, B. Bonnereau, D. Bazin, R. Bimbot, O. Sorlin, M. Szmigiel, R. Anne, M. Lewitowicz, J. E. Sauvestre, M. St.Laurent, J.L. Uzureau, J.M. Corre, H. Keller, J. Trochon, A.C. Mueller, and P. Delbourgo-Salvador

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, Stable isotope ratio, Analytical chemistry, 01 natural sciences, 0103 physical sciences, Incident beam, Atomic physics, 010306 general physics, Beam (structure), Line (formation)
Abstract

A 42 Sc m isomeric beam was produced for the first time at GANIL. The 12 C( 40 Ca, 42 Sc m ) 10 B transfer reaction at 30 MeV / A yielded an isomeric purity of 98±5%. Using the LISE3 on line separation, 30% of the residual 40 Ca nuclei were observed. A 42 Sc m secondary beam intensity of 114 pps was obtained with a 3 10 10 pps 40 Ca incident beam bombarding the 5 mg/cm 2 12 C target.

Published
1994
Full Text
View/download PDF

11. Impact of the radial ionization profile on SEE prediction for SOI transistors and SRAMs beyond the 32-nm technological node

Author

Marc Gaillardin, Arnaud Bournel, Laurent Artola, Sylvain Girard, Melanie Raine, P. Paillet, J-E Sauvestre, Guillaume Hubert, DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), ONERA - The French Aerospace Lab [Toulouse], ONERA, Institut d'Electronique Fondamentale (IES), and Institut d'Electronique Fondamentale

Subjects
010302 applied physics, Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Ion track, Transistor, Silicon on insulator, 01 natural sciences, law.invention, Computational physics, Ion, Cross section (physics), [SPI]Engineering Sciences [physics], Nuclear Energy and Engineering, law, Ionization, 0103 physical sciences, Electronic engineering, Node (circuits), Static random-access memory, Electrical and Electronic Engineering
Abstract

International audience; The relative contribution of the radial ionization profile on SEE prediction is investigated using MUSCA-SEP3 , in comparison with the classical approach considering the ion track as a series of punctual charges. The new approach is validated against experimental results, for three technology generations of PDSOI transistors and for two generations of SOI SRAM cells, showing better agreement than the punctual approach. The impact of the radial approach on the evaluation of SEU cross section as compared to the punctual approach is then investigated for nanometric SOI SRAM cells, beyond the 32-nm technological node. The influence of the radial dimension of the ion track is shown to increase with technology generation. The impact of the ion mass and energy on the ratio between radial and punctual SEU cross section is also investigated.

Published
2011
Full Text
View/download PDF

12. β-decay measurements forN>40Mn nuclei and inference of collectivity for neutron-rich Fe isotopes

Author

C. R. Bingham, F. Becker, F. de Oliveira Santos, Georgi P. Georgiev, I. Matea, O. Roig, Ch. Stodel, H. Grawe, Robert Grzywacz, M. Lewitowicz, M. Sawicka, J. Giovinazzo, G. Belier, E. Bouchez, E. Dragulescu, D. Verney, F. Ibrahim, J. Libert, M. Pfützner, M. Stanoiu, K. P. Rykaczewski, P. Mayet, J. P. Delaroche, O. Perru, F. Hammache, V. Méot, A. Buta, J. E. Sauvestre, Ch. Theisen, J. Żylicz, Michel Girod, R. Borcea, O. Sorlin, I. Stefan, F. Negoita, M. G. Saint-Laurent, and J. M. Daugas

Subjects
Physics, Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, Neutron emission, Branching fraction, 7. Clean energy, 01 natural sciences, Nuclear physics, Neutron number, Isotopes of vanadium, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Delayed neutron, Radioactive decay
Abstract

A decay spectroscopic study of the neutron-rich isotopes has been performed using fragmentation of a 86Kr primary beam. Fragments from this reaction have been selected by the LISE2000 spectrometer at the Grand Acc el erateur National d Ions Lourds (GANIL). Half-lives of 29 isotopes, including the first ones identified for 61Ti (15 4 ms), 64V (19 8 ms), and 71Fe (28 5 ms), have been determined and compared with model predictions. 67,68Mn -delayed rays were observed for the first time. The branching for the -delayed neutron emission was measured to be greater than 10(5)% in the 67Mn decay. The 67Fe isomeric level is firmly determined at higher energy than assigned in previous works. The excitation energies of the first (2+) and (4+) states of 68Fe are suggested to lie at 522(1) and 1389(1) keV, respectively, thus bringing confirmation of assignments based on in-beam -ray spectroscopy. Beyond-mean-field calculations with the Gogny D1S force have been performed for even-mass nuclei through the Fe isotopic chain. Not only 68Fe but most of the neutron-rich Fe isotopes with neutron numbers below N = 50 are interpreted as soft rotors. The calculated mean occupancy of the neutron g9/2 and d5/2 orbitals in correlated ground statesmore » is steadily growing with increasing neutron number throughout the isotopic chain. Interpretation of 67Fe data is based upon the present calculations for the 66Fe and 68Fe even cores.« less

Published
2011
Full Text
View/download PDF

13. Inelastic cross-sections of low-energy electrons in silicon for the simulation of heavy ion tracks with the GEANT4-DNA toolkit

Author

A. Valentin, Melanie Raine, and J. E. Sauvestre

Subjects
Nuclear physics, Physics, Range (particle radiation), Low energy, Silicon, chemistry, Mean free path, Ionization, chemistry.chemical_element, Heavy ion, Electron, Plasmon
Abstract

The Energy-Loss Function (ELF) of silicon has been used to calculate differential and total inelastic cross-sections of incident electrons. The model has been validated in the 16.7 eV-50 keV incident energy range by comparing the stopping powers, mean free paths and ranges to experimental and evaluated ICRU data. The cross sections were then used to simulate low-energy electron tracks in silicon using the Geant4-DNA toolkit. Generation of low-energy electrons are clearly seen. The obtained ranges are consistent with experimental data.

Published
2010
Full Text
View/download PDF

14. Low-lying isomeric levels inCu75

Author

J. M. Daugas, T. Faul, H. Grawe, M. Pfützner, R. Grzywacz, M. Lewitowicz, N. L. Achouri, J. C. Angélique, D. Baiborodin, R. Bentida, R. Béraud, C. Borcea, C. R. Bingham, W. N. Catford, A. Emsallem, G. de France, K. L. Grzywacz, R. C. Lemmon, M. J. Lopez Jimenez, F. de Oliveira Santos, P. H. Regan, K. Rykaczewski, J. E. Sauvestre, M. Sawicka, M. Stanoiu, K. Sieja, and F. Nowacki

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Isotopes of copper, Hadron, Nuclear structure, 7. Clean energy, 01 natural sciences, Baryon, Crystallography, 0103 physical sciences, Atomic physics, 010306 general physics, Ground state, Nucleon, Spin (physics), Excitation
Abstract

Isomeric low-lying states were identified and investigated in the {sup 75}Cu nucleus. Two states at 61.8(5)- and 128.3(7)-keV excitation energies with half-lives of 370(40)- and 170(15)-ns were assigned as {sup 75m1}Cu and {sup 75m2}Cu, respectively. The measured half-lives combined with the recent spin assignment of the ground state allow one to deduce tentatively spin and parity of the two isomers and the dominant multipolarities of the isomeric transitions with respect to the systematics of the Cu isotopes. Shell-model calculations using an up-to-date effective interaction reproduce the evolution of the 1/2{sup -}, 3/2{sup -}, and 5/2{sup -} states for the neutron-rich odd-mass Cu isotopes when filling the nug{sub 9/2}. The results indicate a significant change in the nuclear structure in this region, where a single-particle 5/2{sup -} state coexists with more and more collective 3/2{sup -} and 1/2{sup -} levels at low excitation energies.

Published
2010
Full Text
View/download PDF

15. Observation and modeling of currents induced by14 MeV neutron recoils in dielectrics at high neutron fluxes

Author

J. Baggio, V. Yu. Glebov, J.-E. Sauvestre, J. Gazave, J. L. Bourgade, J. P. Seaux, G. Pien, Christian Stoeckl, J. Raimbourg, T. C. Sangster, S. Bazzoli, Jean-Luc Leray, J. C. Gomme, and N. Authier

Subjects
Nuclear physics, Physics, SIMPLE (dark matter experiment), Range (particle radiation), Neutron, Numerical models, Dielectric, Electrostatics, Inertial confinement fusion, Omega
Abstract

We propose a model of currents induced by 14 MeV neutrons in dielectrics, which agrees well with observed data for the first time in the range of large fluxes (above 1018 n/cm2/s). We propose simple analytical model and numerical calculation using Geant4 consistent with experiments done at OMEGA Inertial Confinement Fusion facility.

Published
2007
Full Text
View/download PDF

16. N=14Shell Closure inO22Viewed through a Neutron Sensitive Probe

Author

E. Khan, Muriel Fallot, V. Lima, P. Roussel-Chomaz, K. W. Kemper, L. Nalpas, E. C. Pollacco, E. Becheva, Dao T. Khoa, F. Skaza, N. Keeley, Lydie Giot, J. E. Sauvestre, V. Lapoux, Franck Delaunay, J. M. Daugas, C. E. Demonchy, Y. Blumenfeld, Didier Beaumel, Marcella Grasso, O. Roig, A. Drouart, J.A. Scarpaci, A. Gillibert, H. S. Than, and A. Musumarra

Subjects
Physics, Elastic scattering, Proton, 010308 nuclear & particles physics, Nuclear Theory, Hadron, General Physics and Astronomy, Inelastic scattering, 01 natural sciences, 0103 physical sciences, Neutron, Continuum (set theory), Nuclear drip line, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

To investigate the behavior of the N=14 neutron gap far from stability with a neutron-sensitive probe, proton elastic and 2{sub 1}{sup +} inelastic scattering angular distributions for the neutron-rich nucleus {sup 22}O were measured using the MUr a STrip detector array at the Grand Accelerateur National d'Ions Lourds facility. A deformation parameter {beta}{sub p,p{sup '}}=0.26{+-}0.04 is obtained for the 2{sub 1}{sup +} state, much lower than in {sup 20}O, showing a weak neutron contribution to this state. A microscopic analysis was performed using matter and transition densities generated by continuum Skyrme-Hartree-Fock-Bogoliubov and quasiparticle random phase approximation calculations, respectively. The ratio of neutron to proton contributions to the 2{sub 1}{sup +} state is found close to the N/Z ratio, demonstrating a strong N=14 shell closure in the vicinity of the neutron drip line.

Published
2006
Full Text
View/download PDF

17. Low energy levels inNi72

Author

M. Sawicka, R. Grzywacz, I. Matea, H. Grawe, M. Pfützner, J. M. Daugas, M. Lewitowicz, D. L. Balabanski, F. Becker, G. Bélier, C. Bingham, C. Borcea, E. Bouchez, A. Buta, M. La Commara, E. Dragulescu, G. de France, G. Georgiev, J. Giovinazzo, M. Górska, F. Hammache, M. Hass, M. Hellström, F. Ibrahim, Z. Janas, H. Mach, P. Mayet, V. Méot, F. Negoita, G. Neyens, F. de Oliveira Santos, R. D. Page, O. Perru, Zs. Podolyák, O. Roig, K. P. Rykaczewski, M. G. Saint-Laurent, J. E. Sauvestre, O. Sorlin, M. Stanoiu, I. Stefan, C. Stodel, Ch. Theisen, D. Verney, and J. Żylicz

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Yrast, Nuclear shell model, Gamma ray, 01 natural sciences, Beta decay, Ion, Nuclear physics, Double beta decay, Excited state, 0103 physical sciences, Atomic physics, 010306 general physics, Spectroscopy
Abstract

The yrast J(pi)=8(+) states in neutron-rich Ni-70,Ni-72,Ni-74,Ni-76 nuclei are predicted to be isomeric. The present paper describes two GANIL experiments. In the first of them a search was made for the 8(+) isomeric states in Ni-72,Ni-74 nuclei via fragmentation of Ge-76 using the ion gamma-decay correlation technique. Although these states were not observed, limits for their lifetimes were determined. In the second experiment the decay spectroscopy of Co-70,Co-72 nuclei was performed using fragmentation of a Kr-86(36+) beam and the new LISE2000 spectrometer. The beta delayed gamma rays from the decay of Co-70,Co-72 to Ni-70,Ni-72 were observed using the EXOGAM germanium detectors. The half life of Co-72 was measured to be 62(3) ms and the level sequence of the lowest excited states in Ni-72 was suggested, with the 2(+) state at 1096 keV. An attempt to reproduce the level scheme in terms of shell-model calculations was undertaken. The reasons for the disappearance of the 8(+) isomer in Ni-72 are discussed.

Published
2003
Full Text
View/download PDF

18. $\beta$ decay of $^{72}$Co and excited levels in $^{72}$Ni

Author

F. Ibrahim, R. Borcea, E. Dragulescu, Georgi P. Georgiev, D. Verney, Robert Grzywacz, M. Sawicka, J. Giovinazzo, F. de Olivieira, M. Stanoiu, O. Roig, C. R. Bingham, Ch. Stodel, Ch. Theisen, V. Méot, F. Negoita, A. Buta, J. E. Sauvestre, F. Becker, O. Sorlin, O. Perru, I. Stefan, I. Matea, J. M. Daugas, P. Mayet, F. Hammache, K. P. Rykaczewski, M. Pfützner, E. Bouchez, M. G. Saint-Laurent, M. Lewitowicz, H. Grawe, G. Belier, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Decay scheme, Isotopes of germanium, 010308 nuclear & particles physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear isomer, 01 natural sciences, Beta-decay stable isobars, Nuclear physics, Double beta decay, 0103 physical sciences, Beta particle, Isotopes of zirconium, Atomic physics, 010306 general physics, Radioactive decay
Abstract

An experiment was performed at GANIL to observe isomeric‐ and beta‐delayed gamma rays from very neutron‐rich nuclei around 74Ni. Fragmentation products of the 86Kr beam at 58 AMeV were studied using new devices: the LISE 2000 spectrometer and detectors from the EXOGAM germanium array. The primary aim of the experiment was to find the 8+ microsecond isomer in 76Ni and to perform beta decay spectroscopy of Co nuclei. We have successfully measured the beta delayed gammas from the decay of 72Co to 72Ni. The energies for the lowest excited states in 72Ni are proposed, with the first 2+ state at 1096 keV. These findings suggest a solution of the problem of the disappearance of the 8+ isomer in 72Ni. We also measured beta decay of other neutron‐rich Co isotopes including 70Co. First evidence was found for a new short lived isomer, most likely the Iπ=8+ state, in 76Ni.

Published
2003
Full Text
View/download PDF

19. The 8+ isomer in $^{78}$Zn and the doubly magic character of $^{78}$Ni

Author

R. Béraud, R.C. Lemmon, M. Sawicka, R. Bentida, W. N. Catford, H. Grawe, L. Achouri, F. Nowacki, F. de Oliveira Santos, G. Sletten, M. Pfützner, J. C. Angélique, J. M. Daugas, C. Borcea, K. P. Rykaczewski, P. H. Regan, D. Baiborodin, K. L. Jones, A. Emsallem, M. J. Lopez Jimenez, Robert Grzywacz, K. Bennaceur, J. E. Sauvestre, M. Lewitowicz, C. R. Bingham, M. Stanoiu, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, scientific edition, SHELL model, Parity assignment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Open Access, Humanities, Fragmentation (mass spectrometry), Open Archives, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Nuclear Physics
Abstract

A new isomeric state in 78Zn has been identified and studied in the fragmentation of a 60.5 AMeV 86Kr beam on a natNi target. The measured energies of the transitions and the half-life, T1/2=319(9) ns, of the isomeric decay suggest a spin and parity assignment F=S+. The deduced B(E2,S+ -+ 6+) value equals 1.21(5) W.u. is well reproduced in large scale shell model calculations using realistic interactions in the proton-neutron 2p3/2, 1f5/2' 2p1/2' 199 / 2 model space. Standard E2 polarisation charges of D.5e for both protons and neutrons were used. This result consists the first experimental evidence of the persistance of the N=50 shell gap in the vicinity f 78N' o 28 150·

Published
2000
Full Text
View/download PDF

20. In-beam gamma spectroscopy of very neutron-rich nuclei at GANIL

Author

C. Borcea, S. Leenhardt, I. Deloncle, M. G. Saint-Laurent, Z. Dlouhy, Yu-E. Penionzhkevich, M. Lewitowicz, O. Sorlin, M. Belleguic, M. J. Lopez, A. Gillibert, C. Donzaud, Ch. Bourgeois, F. Pougheon, H. Savajols, J. M. Daugas, F. Azaiez, M. Stanoiu, M. G. Porquet, F. de Oliveira, J. C. Angélique, S. Grévy, J. Kiener, Josette Duprat, D. Guillemaud-Mueller, A.C. Mueller, N. L. Achouri, J. E. Sauvestre, Yu. Sobolev, W. Shuying, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Smit F.D. Lindsay R. Foertsch S.V., Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Robert, Suzanne

Subjects
Physics, Isotope, 010308 nuclear & particles physics, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Theory, Gamma ray, Coulomb excitation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Condensed Matter Physics, 01 natural sciences, Atomic and Molecular Physics, and Optics, Nuclear physics, Excited state, 0103 physical sciences, Neutron, Gamma spectroscopy, Atomic physics, Nuclear Experiment, 010306 general physics, Ground state, Mathematical Physics, Beam (structure)
Abstract

The structure of nuclei far from stability can be investigated by means of in-beam gamma spectroscopy using both stable and radioactive beams. Two such experiments have been recently performed at GANIL. i) Secondary beams of neutron-rich Ge, Zn and Ni isotopes around N=40 were produced from the fragmentation of a primary 86 Kr beam, and analyzed by means of the LISE3 spectrometer. For the transitions between the 0+ ground state and the first 2+ state, B(E2) values have been extracted from Coulomb excitation cross-section measurement. Some of the obtained results related to the effectiveness of the N=40 spherical sub-shell closure are discussed. ii) In-beam γ-spectroscopy of neutron-rich nuclei around 32Mg produced by fragmentation of 36S have been performed recently. Gamma decay of relatively higher excited states have been measured in a large number of exotic light nuclei. Preliminary results obtained in a number of neutron-rich nuclei around N=20 are presented.

Published
1999

21. Subshell closure study at N=40 by Coulomb excitation and $\beta$-decay

Author

C. Donzaud, G. Canchel, Yu-E. Penionzhkevich, J. M. Daugas, F. Pougheon, C. Borcea, A. Gillibert, J. S. Winfield, M. G. Saint-Laurent, A. Emsalem, M. Belleguic, S. Leenhardt, R. Béraud, C. Longour, J. C. Angélique, D. Guillemaud-Mueller, F. Azaiez, A.C. Mueller, J. Kiener, Josette Duprat, Eric Chabanat, M. G. Porquet, I. Deloncle, J. E. Sauvestre, F. Marie, Yu. Sobolev, S. Grévy, C. Bourgeois, M. Lewitowicz, O. Sorlin, F. de Oliveira, N. A. Orr, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Frois B.

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, 0103 physical sciences, Closure (topology), Coulomb excitation, Atomic physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 01 natural sciences, ComputingMilieux_MISCELLANEOUS
Abstract

NESTER; International audience

Published
1998
Full Text
View/download PDF

22. In-beam gamma spectroscopy of very neutron-rich nuclei at GANIL

Author

F. Pougheon, A. Gillibert, J. C. Angélique, F. Azaiez, S. Leenhardt, M. J. Lopez, Z. Dlouhy, M. Stanoiu, M. Belleguic, M. G. Porquet, W. Shuying, M. G. Saint-Laurent, N. L. Achouri, M. Lewitowicz, S. Grévy, C. Donzaud, J. Kiener, H. Savajols, N. A. Orr, Yu-E. Penionzhkevich, O. Sorlin, J. M. Daugas, C. Borcea, F. Marie, Yu. G. Sobolev, Josette Duprat, P. Roussel-Chomaz, I. Deloncle, D. Guillemaud-Mueller, A.C. Mueller, J. E. Sauvestre, W. Mittig, F. de Oliveira, Ch. Bourgeois, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Baktash C., Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Isotope, 010308 nuclear & particles physics, Gamma ray, Coulomb excitation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, Excited state, 0103 physical sciences, Neutron, Gamma spectroscopy, 010306 general physics, Ground state, Nuclear Experiment, Beam (structure)
Abstract

International audience; The structure of nuclei far from stability call be investigated by means of in-beam gamma spectroscopy using both stable and radioactive beams. A gamma -array consisting of BaF2 and Ge detectors have been used at GANIL in order to perform two of such experiments: i) Secondary beams of neutron-rich Ge, Zn and Ni isotopes around N=40 were produced from the fragmentation of a primary /sup 86/Kr beam, and analyzed by means of the LISE3 spectrometer. For the transitions between the 0/sup +/ ground state and the first 2/sup +/ state, B(E2) values have been extracted from Coulomb excitation cross-section measurement. Some of the obtained results related to the effectiveness of the N=40 spherical sub-shell closure as well as future improvements of the quality of the data are discussed. ii) In-beam gamma -spectroscopy of neutron-rich nuclei around /sup 32/Mg produced by fragmentation of /sup 36/S have been recently performed Gamma decay of relatively higher excited states have been measured in a large number of exotic light nuclei. Preliminary results obtained in a number of even-even nuclei around N=20, such as /sup 20,22/O, /sup 26,28/Ne and /sup 30,32/Mg are presented.

Published
1998
Full Text
View/download PDF

23. Beta-delayed proton emission from the proton-rich isotopes $^{67}$Se, $^{71}$Kr and $^{75}$Sr

Author

M.S. Pravikoff, B. Blank, M. Lewitowicz, S. Andriamonje, C. Donzaud, Z. Hanas, F. Davi, A. Grewe, Robert Grzywacz, J. E. Sauvestre, S. Czajkowski, R. Del Moral, Arnd R. Junghans, A. Fleury, M. Pfützner, J.P. Dufour, Andreas Martin Heinz, A. Musquère, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Proton, Isotope, 010308 nuclear & particles physics, Proton energy, 01 natural sciences, Spectral line, Nuclear physics, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Atomic physics, Proton emission, 010306 general physics, Nucleon, Projectile fragmentation
Abstract

Expérience GANIL, SISSI/LISE; In an experiment at the SISSI/LISE facility of GANIL, we produced proton-rich isotopes in the selenium-to-strontium region by projectile fragmentation of a 78Kr primary beam at 73 MeV/nucleon. The emission of P-delayed protons from h7Se, 7'Kr, and 75Sr was observed for the first time and the corresponding branching ratios were determined. The proton energy spectra were compared to predictions of a statistical model. The half-lives of 67 Se, 7' Kr, and 75Sr were deduced from the time characteristics of the observed proton activity. The half-life of 75Sr was measured for the first time. For “Se and 7'Kr, the obtained half-lives are compared to previous measurements.

Published
1995
Full Text
View/download PDF

24. New isotopes secondary reactions and spectroscopy for medium-mass nuclei at the proton drip line

Author

K. Sümmerer, Z. Janas, S. Andriamonje, K.-H. Schmidt, S. Steinhäuser, R. Del Moral, B. Blank, A. Fleury, M. Lewitowicz, E. Davi, E. Roeckl, M.S. Pravikoff, A. Piechaczek, A. Musquère, Arnd R. Junghans, T. Josso, T. Brohm, Burkart Voss, C. Donzaud, J.P. Dufour, Max Weber, Robert Grzywacz, W. Trinder, E. Hanelt, Andreas Martin Heinz, S. Czajkowski, A. Grewe, C. Röhl, M. Pfützner, J. E. Sauvestre, Chambon, Pascale, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], chemistry.chemical_element, rp-process, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, chemistry, 0103 physical sciences, Atomic physics, Beryllium, 010306 general physics, Spectroscopy, Nucleon, Projectile fragmentation, ComputingMilieux_MISCELLANEOUS
Abstract

This paper reviews two experiments performed at GSI and GANIL. Using a primary beam of 58 Ni at 650 MeV/nucleon impinging on a beryllium target, production cross sections of proton-rich fragments from projectile fragmentation have been measured at the projectile-fragment separator FRS at GSI. The production rates measured demonstrate that counting rates much higher than expected can be obtained at the proton drip line. The results from spectroscopy measurements show that no Thomas-Ehrmann effect is present in our data which means that the decay energies and masses can be well predicted by using e.g. the IMME. The secondary reactions evidence a slight increase of the interaction cross sections when approaching the proton drip line. Finally, in an experiment performed at the SISSI/LISE facility at GANIL using a 78 Kr primary beam, we have observed the 5 new isotopes 60 Ga, 64 As, 69,70 Kr, and 74 Sr. However, we have not found any evidence for 69 Br which was reported to be observed with a few counts at MSU. These new findings change our understanding of the path and of the ending point of the rp process.

Published
1995

25. Evidence for an isomer in 76 Ni

Author

O. Roig, V. Méot, Ch. Theisen, M. Lewitowicz, E. Dragulescu, D. Verney, G. Bélier, F. Negoita, M. G. Saint-Laurent, H. Grawe, M. Stanoiu, Georgi P. Georgiev, E. Bouchez, J. M. Daugas, F. Becker, C. Stodel, R. Borcea, F. de Oliveira Santos, C. R. Bingham, O. Sorlin, I. Stefan, J. E. Sauvestre, A. Buta, F. Ibrahim, M. Sawicka, J. Giovinazzo, M. Pfützner, K. P. Rykaczewski, I. Matea, P. Mayet, F. Hammache, Robert Grzywacz, and O. Perru

Subjects
Physics, Nuclear and High Energy Physics, Isotope, Spectrometer, Hadron, SHELL model, chemistry.chemical_element, Nuclear physics, Microsecond, Crystallography, Nickel, chemistry, Nuclear fusion, Spectroscopy
Abstract

In the experiment performed at the LISE2000 spectrometer at GANIL neutron-rich nickel isotopes were studied by microsecond isomer spectroscopy. Evidence for an isomer in 76Ni is found, consistently with the shell model prediction of an 8 + state of \(\nu (g_{9/2})^2\) structure.

Published
2003
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results