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1. New measurement of the 235U(nth,f) fission yields and development of a Time of Flight line at the LOHENGRIN spectrometer

Author

Houdouin-Quenault M., Sage C., Méplan O., Ramdhane M., Dauvergne D., Gallin-Martel M.L., Muraz J.F., Guillaudin O., Marcatili S., Kessedjian G., Chebboubi A., Serot O., Litaize O., Bernard D., Köster U., Kim Y.H., Mutti P., and Smith A.G.

Subjects
Physics, QC1-999
Abstract

The study of nuclear fission yields has a major impact on the characterization and understanding of the fission process and is mandatory for reactor applications. In the framework of a collaboration between the CEA, the LPSC and the ILL, a program of actinide fission yield measurements has been ongoing for several years at the LOHENGRIN spectrometer. However, the measurement of very low fission yields in the symmetry region and the heavy wing of the distributions is difficult to achieve due to the strong contamination by other masses with much higher yields and requires the development of a new experimental setup. This paper will first present the results of a new absolute measurement of the 235U(nth,f) mass yields using an ionization chamber placed at the exit of the spectrometer. Although very well documented in the literature, these yields show uncertainties lying from 3% to 10% with large discrepancies between libraries and a lack of correlation matrices. New experimental data obtained at the LOHENGRIN spectrometer will be detailed, along with the measurement method and the production of the experimental covariance matrix. The second part will show the development of a Time of Flight (ToF) line in order to improve the background rejection in the mass yield measurements. In the symmetry region, the precision of the measurement is limited by the background estimation due to the charge exchanges with the residual gas of the separator. We plan to analyze the events using a triple coincidence (∆E x E) x ToF, whereas today only (∆E x E) selection is available. The new ToF line is built using Si3N4 foils and secondary electron detectors (SED) for the start and stop detectors. We will present the choices made for the SED technology along with the progress achieved on the ToF line characterization.

Published
2023
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2. Fission fragments observables measured at the LOHENGRIN spectrometer

Author

Julien-Laferrière S., Thombansen L., Kessedjian G., Chebboubi A., Serot O., Sage C., Méplan O., Ramdhane M., Litaize O., Nicholson J., Bernard D., Köster U., Mutti P., Materna T., and Rapala M.

Subjects
Physics, QC1-999
Abstract

Nuclear fission yields are key data for reactor studies, such as spent fuel inventory or decay heat, and for understanding fission process. Despite a significant effort allocated to measure fission yields during the last decades, the recent evaluated libraries still need improvements in particular in the reduction of the uncertainties. Moreover, some discrepancies between these libraries must be explained. Additional measurements provide complementary information and estimations of experimental correlations, and new kinds of measurements enable to test the models used during the nuclear data evaluation process. A common effort by the CEA, the LPSC and the ILL aims at tackling these issues by providing precise measurements of isotopic and isobaric fission yields with the related variance-covariance matrices. Additionally, the experimental program involves a large range of observables requested by the evaluations, such as kinetic energy dependency of isotopic yields and odd-even effect in order to test the sharing of total excitation energy and the spin generation mechanism. Another example is the complete range of isotopic distribution per mass that allows the determination of the charge polarization, which has to be consistent for complementary masses (pre-neutron emission). For instance, this information is the key observable for the evaluation of isotopic yields. Finally, ionic charge distributions are indirect measurements of nanosecond isomeric ratios as a probe of the nuclear de-excitation path in the (E*, J, π) representation. Measurements for thermal neutron induced fission of 241 Pu have been carried out at the ILL in Grenoble, using the LOHENGRIN mass spectrometer. Methods, results and comparison to models calculations will be presented corresponding to a status on fission fragments observables reachable with this facility.

Published
2020
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3. Measurements of Fission Products Yields with the LOHENGRIN mass spectrometer at ILL

Author

Chebboubi A., Julien-Laferrière S., Nicholson J., Kessedjian G., Serot O., Blanc A., Bernard D., Faust H., Kim Y.H., Köster U., Letourneau A., Litaize O., Méplan O., Mutti P., Rapala M., Ramdhane M., and Sage C.

Subjects
Physics, QC1-999
Abstract

The CEA in collaboration with ILL and LPSC has developed a measurement program on symmetric and heavy mass fission product distributions. The combination of measurements with ionisation chamber and Ge detectors is necessary to describe precisely the heavy fission product region in mass and charge. Recently, new measurements of fission yields and kinetic energy distributions, for different fissioning systems (233,235 U(nth, f),241 Am(2nth, f) and 239,241 Pu(nth, f), were performed with recoil spectrometer LOHENGRIN. The focus has been done on the self-normalization of the data to provide new absolute measurements, independently of any libraries along with the experimental covariance matrix. To reach precise measurements, a new experimental procedure was developed along with a new analysis method.

Published
2020
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4. Status of fission fragment observables measured with the LOHENGRIN spectrometer

Author

Julien-Laferrière S., Thombansen L., Kessedjian G., Chebboubi A., Serot O., Sage C., Méplan O., Ramdhane M., Litaize O., Bernard D., Nicholson J., Blanc A., Faust H., Mutti P., Köster U., Letourneau A., Materna T., and Rapala M.

Subjects
Physics, QC1-999
Abstract

Nuclear fission yields are key parameters to evaluate reactor physics observables, such as fuel inventory, decay heat, spent fuel radiotoxicity, criticality but also for understanding the fission process. Despite a significant effort allocated to measure fission yields during the last decades, the recent evaluated libraries still need improvements in particular in the description of the uncertainties with the associated correlations. Additional kinds of measurements provide complementary information in order to test the models used in the nuclear data evaluation. Moreover, some discrepancies between these libraries must be explained. A common effort by the CEA, the LPSC and the ILL aims at tackling these issues by providing precise measurement of isotopic and isobaric fission yields with the related variance-covariance matrices. Nevertheless, the experimental program represents itself a large range of observables requested by the evaluations: isotopic yields, nuclear charge polarization, odd-even effect, isomeric ratio and their dependency with fission fragment kinetic energy as a probe of the nuclear de-excitation path in the (E*, Jπ) representation. Measurements for thermal neutron induced fission of 241Pu have been carried out at the Institut Laue Langevin using the LOHENGRIN mass spectrometer. Experimental program, observables reachable, results and comparison to model calculations are shown.

Published
2019
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5. Excited States and Collectivity in 88Se

Author

Simpson G., Grachev I., Thiamova G., Ramdhane M., Sieja K., Blanc A., Jentschel M., Köster U., Mutti P., Soldner T., de France G., Ur C.A., and Urban W.

Subjects
Physics, QC1-999
Abstract

The γ decays of excited states in the very neutron-rich nucleus 88Se have been observed following the cold neutron-induced fission of 235U at the PF1B facility of the Institut Laue-Langevin (ILL), Grenoble. The EXILL array was used to measure γ - γ - γ coincidences, which were then analysed to build a level scheme of 88Se. A low (2+1) energy hints at the onset of quadrupole deformation and the identification of possible members of a (2+2) band provide evidence for γ vibrations. Shell-model calculations using a 78Ni core reproduce the experimental decay scheme well, implying that interactions between particles in the π f5/2 p and vsd orbits are responsible for much of the collectivity present. The algebraic collective model has also been used to interpret the experimental data, showing that that the experimental spectrum is consistent with 88Se being a transitional nucleus, possessing weak static β deformation and γ instability.

Published
2018
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6. Structure of $^{83}$As, $^{85}$As and $^{87}$As: from semi-magicity to $\gamma$-softness

Author

Rezynkina, K., Dao, D. D., Duchene, G., Dudouet, J., Nowacki, F., Clement, E., Lemasson, A., Andreoiu, C., Astier, A., de Angelis, G., de France, G., Delafosse, C., Deloncle, I., Didierjean, F., Dombradi, Z., Ducoin, C., Gadea, A., Gottardo, A., Guinet, D., Jacquot, B., Jones, P., Konstantinopoulos, T., Kuti, I., Korichi, A., Lenzi, S. M., Li, G., Blanc, F. Le, Lizarazo, C., Lozeva, R., Maquart, G., Million, B., Michelagnoli, C., Napoli, D. R., Navin, A., Perez-Vidal, R. M., Petrache, C. M., Pietralla, N., Ralet, D., Ramdhane, M., Rejmund, M., Stezowski, O., Schmitt, C., Sohler, D., and Verney, D.

Subjects
Nuclear Experiment
Abstract

The structure of $^{83}$As, $^{85}$As and $^{87}$As have been studied in fusion-fission reaction $^{238}$U+$^9$Be. Fission fragments were identified in mass and atomic number using the VAMOS++ spectrometer and the coincident $\gamma$-rays were detected in the $\gamma$-ray tracking array AGATA. New transitions in $^{83}$As and $^{85}$As are reported and placed in the level schemes. A level scheme of the excited states in $^{87}$As is proposed for the first time. The data are interpreted in frame of Large-Scale Shell-Model calculations, SU3 symmetries and Beyond Mean-Field frameworks. A spherical regime at magic number $N$=50 is predicted and the location of the proton $g_{9/2}$ orbital is proposed for the first time. Development of collectivity in a prolate deformed, $\gamma$-soft regime in the open shell cases $^{85}$As and $^{87}$As, most neutron-rich isotopes beyond $N$=50, is concluded. Data and theoretical calculations give confidence to a relatively high extrapolated excitation energy about 4 MeV of the $9/2^+$ state in $^{79}$Cu, one proton above $^{78}$Ni.

Published
2022
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7. γ-ray spectroscopy of fission fragments from the cold-neutron 235U induced fission with EXILL

Author

Konstantinopoulos T., Astier A., Petrache C., Abudra A., Bontemps R., Deloncle I., Kaim S., Leguillon R., Porquet M.-G., Zerrouki T., Grente L., Salsac M.-D., Zielinska M., France G. de, Janas Z., Karny M., Korgul A., Ramdhane M., Gey G., Simpson G., Vancraeyenest A., Blanc A., Jentschel M., Köster U., Mutti P., Soldner T., Urban W., Duchêne G., Lozeva R., Ibrahim F., Gargano A., Covello A., Mengoni D., Ur C.A., Sferrazza M., and Melon B.

Subjects
Physics, QC1-999
Abstract

A cold neutron induced fission experiment recently took place at the Institute Laue-Langevin (ILL) in Grenoble. The neutron beam was provided by the nuclear reactor facility at ILL and the detector setup that was used for the γ-spectroscopy of the fission products consisted mainly of the detectors of the EXOGAM array [1], thereby the name of the campaign is EXILL. The main purpose of our measurement was to investigate the nuclei in the region with N = 50 close to 78Ni as well as the nuclei close to the N = 82 shell closure. In this paper, the motivation of the experiment is described as well as the experimental setup and the status of the ongoing data analysis.

Published
2013
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8. Prompt gamma ray-spectroscopy of N = 50 fission fragments

Author

Drouet F., Simpson G.S., Vancraeyenest A., Gey G., Kessedjian G., Malkiewicz T., Ramdhane M., Sage C., Thiamova G., Grahn T., Greenlees P.T., Hauschild K., Herzan A., Jakobsson U., Jones P., Julin R., Juutinen S., Ketelhut S., Lopez-Martens A., Nieminen P., Peura P., Rahkila P., Rinta-Antila S., Ruotsalainen P., Sandzelius M., Saren J., Scholey C., Sorri J., and Uusitalo J.

Subjects
Physics, QC1-999
Abstract

Excited states in the nuclei 83As and 84,86Se have been studied via prompt γ-ray spectroscopy. The nuclei were produced by the proton-induced fission of a 238U target, at the accelerator of the University of Jyväskylä. The JUROGAM-II array was used to detect prompt γ-rays and a triple-γ coincidence analysis performed. A comparison of the N = 50 nuclei with shell-model calculations reproduces the low-lying states in 83As and 84Se well. The inclusion of particle-hole excitations is necessary to correctly describe the states above ∼ 3.5 MeV.

Published
2013
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9. Prompt γ-ray spectroscopy of the neutron-rich 124Cd

Author

Vancraeyenest A., Simpson G.S., Gey G., Greenlees P.T., Drouet F., Kessedjian G., Malkiewicz T., Ramdhane M., Sage C., Thiamova G., Grahn T., Hauschild K., Herzan A., Jakobsson U., Jones P., Julin R., Juutinen S., Ketelhut S., Lopez-Martens A., Nieminen P., Peura P., Rahkila P., Rinta-Antila S., Ruotsalainen P., Sandzelius M., Saren J., Scholey C., Sorri J., and Uusitalo J.

Subjects
Physics, QC1-999
Abstract

Prompt γ-ray spectroscopy of neutron-rich cadmium isotopes has been performed. The nuclei of interest have been populated via a 25-MeV, proton-induced fission of the 238U thick target and prompt γ-rays measured using the multi-detector HPGe array JUROGAM II. New high-spin decays have been observed and placed in the level scheme using triple coincidence gates. The experimental results are compared to shell-model calculations and show good agreement.

Published
2013
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10. Structure of high-lying levels populated in the $^{96}$Y $\rightarrow ^{96}$Zr $\beta$ decay

Author

Mashtakov, K. R., Ponomarev, V. Yu., Scheck, M., Finch, S. W., Isaak, J., Zweidinger, M., Agar, O., Bathia, C., Beck, T., Beller, J., Bowry, M., Chapman, R., Chisthi, M. M. R., Friman-Gayer, U., Gaffney, L. P., Garrett, P. E., Gregor, E. T., Keatings, J. M., Köster, U., Löher, B., McLean, A. D., O'Donnell, D., Pai, H., Pietralla, N., Rainovski, G., Ramdhane, M., Romig, C., Rusev, G., Savran, D., Simpson, G. S., Sinclair, J., Sonnabend, K., Spagnoletti, P., Tonchev, A. P., and Tornow, W.

Subjects
Nuclear Experiment
Abstract

The nature of $J^{\pi}=1^-$ levels of $^{96}$Zr below the $\beta$-decay $Q_{\beta}$ value of $^{96}$Y has been investigated in high-resolution $\gamma$-ray spectroscopy following the $\beta$ decay as well as in a campaign of inelastic photon scattering experiments. Branching ratios extracted from $\beta$ decay allow the absolute $E1$ excitation strength to be determined for levels populated in both reactions. The combined data represents a comprehensive approach to the wavefunction of $1^-$ levels below the $Q_{\beta}$ value, which are investigated in the theoretical approach of the Quasiparticle Phonon Model. This study clarifies the nuclear structure properties associated with the enhanced population of high-lying levels in the $^{96}$Y$_{gs}$ $\beta$ decay, one of the three most important contributors to the high-energy reactor antineutrino spectrum.

Published
2020
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13. New measurement of the 235U(nth,f) fission yields and development of a Time of Flight line at the LOHENGRIN spectrometer.

Author

Houdouin-Quenault, M., Sage, C., Méplan, O., Ramdhane, M., Dauvergne, D., Gallin-Martel, M.L., Muraz, J.F., Guillaudin, O., Marcatili, S., Kessedjian, G., Chebboubi, A., Serot, O., Litaize, O., Bernard, D., Köster, U., Kim, Y.H., Mutti, P., and Smith, A.G.

Subjects
NUCLEAR fission, TIME-of-flight spectrometers, NUCLEAR reactors, ACTINIDE elements, COVARIANCE matrices
Abstract

The study of nuclear fission yields has a major impact on the characterization and understanding of the fission process and is mandatory for reactor applications. In the framework of a collaboration between the CEA, the LPSC and the ILL, a program of actinide fission yield measurements has been ongoing for several years at the LOHENGRIN spectrometer. However, the measurement of very low fission yields in the symmetry region and the heavy wing of the distributions is difficult to achieve due to the strong contamination by other masses with much higher yields and requires the development of a new experimental setup. This paper will first present the results of a new absolute measurement of the 235U(nth,f) mass yields using an ionization chamber placed at the exit of the spectrometer. Although very well documented in the literature, these yields show uncertainties lying from 3% to 10% with large discrepancies between libraries and a lack of correlation matrices. New experimental data obtained at the LOHENGRIN spectrometer will be detailed, along with the measurement method and the production of the experimental covariance matrix. The second part will show the development of a Time of Flight (ToF) line in order to improve the background rejection in the mass yield measurements. In the symmetry region, the precision of the measurement is limited by the background estimation due to the charge exchanges with the residual gas of the separator. We plan to analyze the events using a triple coincidence (∆E x E) x ToF, whereas today only (∆E x E) selection is available. The new ToF line is built using Si3N4 foils and secondary electron detectors (SED) for the start and stop detectors. We will present the choices made for the SED technology along with the progress achieved on the ToF line characterization. [ABSTRACT FROM AUTHOR]

Published
2023
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14. Structure of As83, As85, and As87 : From semimagicity to γ softness

Author

Rezynkina, K., primary, Dao, D. D., additional, Duchêne, G., additional, Dudouet, J., additional, Nowacki, F., additional, Clément, E., additional, Lemasson, A., additional, Andreoiu, C., additional, Astier, A., additional, de Angelis, G., additional, de France, G., additional, Delafosse, C., additional, Deloncle, I., additional, Didierjean, F., additional, Dombradi, Z., additional, Ducoin, C., additional, Gadea, A., additional, Gottardo, A., additional, Guinet, D., additional, Jacquot, B., additional, Jones, P., additional, Konstantinopoulos, T., additional, Kuti, I., additional, Korichi, A., additional, Lenzi, S. M., additional, Li, G., additional, Le Blanc, F., additional, Lizarazo, C., additional, Lozeva, R., additional, Maquart, G., additional, Million, B., additional, Michelagnoli, C., additional, Napoli, D. R., additional, Navin, A., additional, Pérez-Vidal, R. M., additional, Petrache, C. M., additional, Pietralla, N., additional, Ralet, D., additional, Ramdhane, M., additional, Rejmund, M., additional, Stezowski, O., additional, Schmitt, C., additional, Sohler, D., additional, and Verney, D., additional

Published
2022
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15. New β -decay spectroscopy of the Te137 nucleus

Author

Si, M., primary, Lozeva, R., additional, Naïdja, H., additional, Blanc, A., additional, Daugas, J.-M., additional, Didierjean, F., additional, Duchêne, G., additional, Köster, U., additional, Kurtukian-Nieto, T., additional, Le Blanc, F., additional, Mutti, P., additional, Ramdhane, M., additional, and Urban, W., additional

Published
2022
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16. New β−decay spectroscopy of the $^{137 }$Te nucleus

Author

Si, M, Lozeva, R, Naïdja, H, Blanc, A, Daugas, J.-M, Didierjean, F, Duchêne, G, Köster, U, Kurtukian-Nieto, T, Le Blanc, F, Mutti, P, Ramdhane, M, Urban, W, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), LaBoratoire d'Imagerie biOmédicale MultimodAle Paris-Saclay (BIOMAPS), Service Hospitalier Frédéric Joliot (SHFJ), Université Paris-Saclay-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), University of Warsaw (UW), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Duchene, Gilbert

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

International audience; Background: Nuclear structure of the neutron-rich isotopes beyond 132 Sn is investigated. Purpose: The level scheme of 137 I is obtained after decay of 137 Te. Transitions in 136 I are detected after delayed neutron emission of 137 Te. The half life of 137 Te is measured. Methods:-delayed-ray spectroscopy is employed for neutron-rich 137 Sb and 137 Te isotopes, produced at the ILL after neutron-induced fission to populate excited states in 137 I. Results: The new decay level scheme of 137 I is established. The half lives of 137 Sb and 137 Te are determined as 0.57(26) s and 2.46(5) s, respectively. The-delayed neutron emission probability P limiting value of 137 Te is deduced to be 2.17(66)%. Conclusions: The experimental results are an important input to the theoretical description of nuclei in the region, being well interpreted within LSSM calculations and provide essential information on the firstforbidden transitions beyond > 82 and > 50.

Published
2022

17. Structure of <math><mmultiscripts><mi>As</mi><mprescripts/><none/><mn>83</mn></mmultiscripts><mo>,</mo></math> <math><mmultiscripts><mi>As</mi><mprescripts/><none/><mn>85</mn></mmultiscripts><mo>,</mo></math> and <math><mmultiscripts><mi>As</mi><mprescripts/><none/><mn>87</mn></mmultiscripts></math>: From semimagicity to <math><mi>γ</mi></math> softness

Author

Rezynkina, K., Dao, D.D., Duchene, G., Dudouet, J., Nowacki, F., Clément, E., Lemasson, A., Andreoiu, C., Astier, A., de Angelis, G., de France, G., Delafosse, C., Deloncle, I., Didierjean, F., Dombradi, Z., Ducoin, C., Gadea, A., Gottardo, A., Guinet, D., Jacquot, B., Jones, P., Konstantinopoulos, T., Kuti, I., Korichi, A., Lenzi, S.M., Li, G., Le Blanc, F., Lizarazo, C., Lozeva, R., Maquart, G., Million, B., Michelagnoli, C., Napoli, D.R., Navin, A., Perez-Vidal, R.M., Petrache, C.M., Pietralla, N., Ralet, D., Ramdhane, M., Rejmund, M., Stezowski, O., Schmitt, C., Sohler, D., Verney, D., Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), 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), 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 des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), and Université Grenoble Alpes (UGA)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

International audience; The structure of As83, As85, and As87 have been studied in fusion-fission reaction U238+Be9. Fission fragments were identified in mass and atomic number using the VAMOS++ spectrometer and the coincident γ rays were detected in the γ-ray tracking array AGATA. New transitions in As83 and As85 are reported and placed in the level schemes. A level scheme of the excited states in As87 is proposed for the first time. The data are interpreted in frame of large-scale shell-model calculations, SU3 symmetries, and beyond mean-field frameworks. A spherical regime at magic number N=50 is predicted and the location of the proton g9/2 orbital is proposed for the first time. Development of collectivity in a prolate deformed, γ-soft regime in the open shell cases As85 and As87, most neutron-rich isotopes beyond N=50, is concluded. Data and theoretical calculations give confidence to a relatively high extrapolated excitation energy about 4 MeV of the 9/2+ state in Cu79, one proton above Ni78.

Published
2022

18. Structure of 83As, 85As, and 87As : From semimagicity to gamma softness

Author

Rezynkina, K., Dao, D. D., Duchene, G., Dudouet, J., Nowacki, F., Clement, E., Lemasson, A., Andreoiu, C., Astier, A., de Angelis, G., de France, G., Delafosse, C., Deloncle, I., Didierjean, F., Dombradi, Z., Ducoin, C., Gadea, A., Gottardo, A., Guinet, D., Jacquot, B., Jones, P., Konstantinopoulos, T., Kuti, I., Korichi, A., Lenzi, S. M., Li, G., Le Blanc, F., Lizarazo, C., Lozeva, R., Maquart, G., Million, B., Michelagnoli, C., Napoli, D. R., Navin, A., Perez-Vidal, R. M., Petrache, C. M., Pietralla, N., Ralet, D., Ramdhane, M., Rejmund, M., Stezowski, O., Schmitt, C., Sohler, D., and Verney, D.

Published
2022

19. Measurements of $$^{233}$$U$$(\text {n}_{\text {th}},\text {f})$$ fission product mass yields with the LOHENGRIN recoil mass spectrometer

Author

Chebboubi, A., primary, Kessedjian, G., additional, Serot, O., additional, Faust, H., additional, Köster, U., additional, Litaize, O., additional, Sage, C., additional, Blanc, A., additional, Bernard, D., additional, Letourneau, A., additional, Materna, T., additional, Méplan, O., additional, Mutti, P., additional, Rapala, M., additional, and Ramdhane, M., additional

Published
2021
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20. Structure of high-lying levels populated in the Y-96 -> Zr-96 beta decay

Author

Mashtakov, KR, Ponomarevc, V Yu, Scheck, M, Finch, SW, Isaak, J, Zweidinger, M, Agar, O, Bathia, C, Beck, T, Beller, J, Bowrya, M, Chapman, R, Chishti, MMR, Friman-Gayer, U, Gaffney, LP, Garrett, PE, Gregor, ET, Keatings, JM, Koster, U, Loher, B, MacLean, AD, O'Donnell, D, Pai, H, Pietralla, N, Rainovski, G, Ramdhane, M, Romig, C, Rusev, G, Savran, D, Simpson, GS, Sinclair, J, Sonnabend, K, Spagnoletti, P, Tonchev, AP, and Tornow, W

Subjects
Science & Technology, Physics, Nuclear, Reactor antineutrino anomaly, NUCLEAR-DATA SHEETS, Quasi-particle phonon model, Physics, Physical Sciences, High resolution gamma-ray spectroscopy, Pygmy dipole resonance, Astronomy & Astrophysics, Physics, Particles & Fields
Abstract

ispartof: PHYSICS LETTERS B vol:820 status: published

Published
2021

21. Structure of high-lying levels populated in the Y → Zr Decay

Author

Mashtakov, K.R., Ponomarev, V.Yu., Scheck, M., Finch, S.W., Isaak, J., Zweidinger, M., Agar, O., Bathia, C., Beck, T., Beller, J., Bowry, M., Chapman, R., Chishti, M.M.R., Friman-Gayer, U., Gaffney, L.P., Garrett, P.E., Gregor, E.T., Keatings, J.M., Köster, U., Löher, B., MacLean, A.D., O'Donnell, D., Pai, H., Pietralla, N., Rainovski, G., Ramdhane, M., Romig, C., Rusev, G., Savran, D., Simpson, G.S., Sinclair, J., Sonnabend, K., Spagnoletti, P., Tonchev, A.P., and Tornow, W.

Abstract

The nature of the high-lying final levels of the $^{96}$Y$_{gs}$ β decay, one of the three most important contributors to the high-energy reactor antineutrino spectrum, has been investigated in high-resolution γ-ray spectroscopy following the β decay as well as in a campaign of inelastic photon scattering experiments. The comprehensive approach establishes 1$^{−}$ levels associated with the Pygmy Dipole Resonance as high-lying final levels in the β decay. Branching ratios extracted from β decay complement photon scattering and allow the absolute E1 excitation strength to be determined for levels populated in both reactions. The combined data represents a comprehensive approach to the wavefunction of the 1− levels below the Qβ value, which are investigated in the Quasiparticle Phonon Model. The calculations reveal that the components populated in β decay contribute only with small amplitudes to the complex wavefunction of these 1$^{−}$ levels. A comparison of the β decay results to data from total absorption γ-ray spectroscopy demonstrates a good agreement between both measurements.

Published
2021

22. Structure of high-lying levels populated in the 96Y →96Zr β decay

Author

Mashtakov, K.R., Ponomarev, V.Yu., Scheck, M., Finch, S.W., Isaak, J., Zweidinger, M., Agar, O., Bathia, C., Beck, T., Beller, J., Bowry, M., Chapman, R., Chishti, M.M.R., Friman-Gayer, U., Gaffney, L.P., Garrett, P.E., Gregor, E.T., Keatings, J.M., Köster, U., Löher, B., MacLean, A.D., O'Donnell, D., Pai, H., Pietralla, N., Rainovski, G., Ramdhane, M., Romig, C., Rusev, G., Savran, D., Simpson, G.S., Sinclair, J., Sonnabend, K., Spagnoletti, P., Tonchev, A.P., and Tornow, W.

Published
2021
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24. Characterization of Diamond and Silicon Carbide Detectors With Fission Fragments

Author

Gallin-Martel, M. L., primary, Kim, Y. H., additional, Abbassi, L., additional, Bes, A., additional, Boiano, C., additional, Brambilla, S., additional, Collot, J., additional, Colombi, G., additional, Crozes, T., additional, Curtoni, S., additional, Dauvergne, D., additional, Destouches, C., additional, Donatini, F., additional, Gallin-Martel, L., additional, Ghouini, O., additional, Hostachy, J. Y., additional, Iskra, Ł. W., additional, Jastrzab, M., additional, Kessedjian, G., additional, Köster, U., additional, Lacoste, A., additional, Lyoussi, A., additional, Marcatili, S., additional, Motte, J. F., additional, Muraz, J. F., additional, Nowak, T., additional, Ottaviani, L., additional, Pernot, J., additional, Portier, A., additional, Rahajandraibe, W., additional, Ramdhane, M., additional, Rydygier, M., additional, Sage, C., additional, Tchoualack, A., additional, Tribouilloy, L., additional, and Yamouni, M., additional

Published
2021
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25. Measurements of $^{233}$U$(\text {n}_{\text {th}},\text {f})$ fission product mass yields with the LOHENGRIN recoil mass spectrometer

Author

Chebboubi, A., Kessedjian, G., Serot, O., Faust, H., Köster, U., Litaize, O., Sage, C., Blanc, A., Bernard, D., Letourneau, A., Materna, T., Méplan, O., Mutti, P., Rapala, M., Ramdhane, M., CEA Cadarache, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Institut Laue-Langevin (ILL), ILL, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
Nuclear and High Energy Physics, 010308 nuclear & particles physics, 0103 physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, Nuclear Experiment, 01 natural sciences, 7. Clean energy
Abstract

International audience; Numerous measurements of fission product yields were performed since the discovery of the nuclear fission process. However, more precise and reliable fission product yields are requested. Lack of covariance matrices make difficult to use it for specific application purposes such as the propagation uncertainty of decay heat. In this work, we propose to measure independently the fission product mass yields for the whole heavy peak (including the symmetric mass region) for the $^{233}$U$(\text {n}_{\text {th}},\text {f})$ reaction. Both average values and experimental covariance is provided. The fission product mass yields are measured with the LOHENGRIN recoil mass spectrometer of the ILL using an ionization chamber located at the focal plane. A new procedure of data taking has been developed in order to minimize the biases. Concretely several ionic charges and kinetic energy distributions have been measured for each mass. Particular attention has been considered in the monitoring of the target time evolution. Additional corrections were necessary in the symmetry mass region due to contaminants coming from the LOHENGRIN recoil mass spectrometer. A complex Monte Carlo analysis has been developed in order to better propagate all the uncertainties. The fission product mass yields of the $^{233}$U$(\text {n}_{\text {th}},\text {f})$ and its associated covariance matrix has been produced. An overall good agreement has been observed with ENDF/B-VIII.0 in contrast with the JEFF-3.3 evaluation. A precision around 2% for the heavy peak has been measured. The experimental covariance matrix was also computed. In the symmetry mass region, two components were observed in the kinetic energy distribution. One of this component was considered as an artifact and was ruled-out.

Published
2021

26. Structure of high-lying levels populated in the $^{96}Y$ ��� $^{96}Zr$ $��$ decay

Author

Mashtakov, K. R., Ponomarev, V. Yu., Scheck, M., Finch, S. W., Isaak, J., Zweidinger, M., Agar, O., Bathia, C., Beck, T., Beller, J., Bowry, M., Chapman, R., Chishti, M. M. R., Friman-Gayer, U., Gaffney, L. P., Garrett, P. E., Gregor, E. T., Keatings, J. M., K��ster, U., L��her, Bastian, MacLean, A. D., O'Donnell, D., Pai, H., Pietralla, N., Rainovski, G., Ramdhane, M., Romig, C., Rusev, G., Savran, D., Simpson, G. S., Sinclair, J., Sonnabend, K., Spagnoletti, P., Tonchev, A. P., and Tornow, W.

Abstract

Physics letters / B 820, 136569 (2021). doi:10.1016/j.physletb.2021.136569, Published by North-Holland Publ., Amsterdam

Published
2021
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27. Investigation of fission product isomeric ratios and angular momenta of 132Sn populated in the 241Pu(nth,f) reaction

Author

Nicholson, J., Chebboubi, A., Serot, O., Kessedjian, G., Kim, Y.H., Köster, U., Litaize, O., Méplan, O., Sage, C., Ramdhane, M., CEA Cadarache, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), and Institut Laue-Langevin (ILL)

Subjects
Physics, QC1-999, Physics::Atomic and Molecular Clusters, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

During an experimental campaign performed at the LOHENGRIN recoil spectrometer of the Institut Laue-Langevin (ILL), a kinetic energy dependence of 132Sn fission product isomeric ratio (IR) has been measured by inducing thermal fission of 241Pu. The IRs are deduced using gamma ray spectrometry in coincidence with the ionisation chamber. To interpret these data, we use the FIFRELIN Monte-Carlo code to simulate the de-excitation of the fission fragments. Combining the IRs with the FIFRELIN calculations, the angular momentum distribution with kinetic energy of the doubly magic nucleus of 132Sn was deduced. This will be compared with the angular momentum distribution obtained for the reaction 235U(nth,f) for 132Sn.

Published
2021

30. Structure of high-lying levels populated in the $^{96}$Y $\rightarrow ^{96}$Zr $\beta$ decay

Author

Mashtakov, K.R., Ponomarev, V.Yu., Scheck, M., Finch, S.W., Isaak, J., Zweidinger, M., Agar, O., Bathia, C., Beck, T., Beller, J., Bowry, M., Chapman, R., Chishti, M.M.R., Friman-Gayer, U., Gaffney, L.P., Garrett, P.E., Gregor, E.T., Keatings, J.M., Köster, U., Löher, B., MacLean, A.D., O'Donnell, D., Pai, H., Pietralla, N., Rainovski, G., Ramdhane, M., Romig, C., Rusev, G., Savran, D., Simpson, G.S., Sinclair, J., Sonnabend, K., Spagnoletti, P., Tonchev, A.P., Tornow, W., HEP, INSPIRE, Institut Laue-Langevin (ILL), ILL, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), and Université Grenoble Alpes (UGA)

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], High Energy Physics::Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

The nature of $J^{\pi}=1^-$ levels of $^{96}$Zr below the $\beta$-decay $Q_{\beta}$ value of $^{96}$Y has been investigated in high-resolution $\gamma$-ray spectroscopy following the $\beta$ decay as well as in a campaign of inelastic photon scattering experiments. Branching ratios extracted from $\beta$ decay allow the absolute $E1$ excitation strength to be determined for levels populated in both reactions. The combined data represents a comprehensive approach to the wavefunction of $1^-$ levels below the $Q_{\beta}$ value, which are investigated in the theoretical approach of the Quasiparticle Phonon Model. This study clarifies the nuclear structure properties associated with the enhanced population of high-lying levels in the $^{96}$Y$_{gs}$ $\beta$ decay, one of the three most important contributors to the high-energy reactor antineutrino spectrum.

Published
2020

31. Structure of high-lying levels populated in the ⁹⁶Y → ⁹⁶Zr β decay

Author

Mashtakov, K. R., Ponomarev, V. Yu., Scheck, M., Finch, S. W., Isaak, J., Zweidinger, M., Agar, O., Bathia, C., Beck, T., Beller, J., Bowry, M., Chapman, R., Chishti, M. M. R., Friman-Gayer, U., Gaffney, L. P., Garrett, P. E., Gregor, E. T., Keatings, J. M., Köster, U., Löher, B., McLean, A. D., O'Donnell, D., Pai, H., Pietralla, N., Rainovski, G., Ramdhane, M., Romig, C., Rusev, G., Savran, D., Simpson, G. S., Sinclair, J., Sonnabend, K., Spagnoletti, P., Tonchev, A. P., and Tornow, W.

Abstract

The nature of Jπ=1− levels of 96Zr below the β-decay Qβ value of 96Y has been investigated in high-resolution γ-ray spectroscopy following the β decay as well as in a campaign of inelastic photon scattering experiments. Branching ratios extracted from β decay allow the absolute E1 excitation strength to be determined for levels populated in both reactions. The combined data represents a comprehensive approach to the wavefunction of 1− levels below the Qβ value, which are investigated in the theoretical approach of the Quasiparticle Phonon Model. This study clarifies the nuclear structure properties associated with the enhanced population of high-lying levels in the 96Ygs β decay, one of the three most important contributors to the high-energy reactor antineutrino spectrum.

Published
2020

34. The decay of the new neutron-rich isotope 217Bi

Author

Kurpeta, J., P\lochocki, A., Andreyev, A. N., Äystö, J., De Smet, A., De Witte, H., Evensen, A.-H., Fedoseyev, V., Franchoo, S., Górska, M., Huhta, M., Huyse, M., Janas, Z., Jokinen, A., Karny, M., Kugler, E., Kurcewicz, W., Köster, U., Lettry, J., Nieminen, A., Partes, K., Ramdhane, M., Ravn, H. L., Rykaczewski, K., Szerypo, J., Van de Vel, K., Van Duppen, P., Weissman, L., Walter, G., Wöhr, A., Collaboration, IS387, and Collaboration, ISOLDE

Published
2003
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35. Isomeric and ground-state decay of 215 Bi

Author

Kurpeta, J., Plochocki, A., Andreyev, A. N., Äystö, J., De Smet, A., Witte, H. De, Evensen, A.-H., Fedoseyev, V., Franchoo, S., Górska, M., Grawe, H., Huhta, M., Huyse, M., Janas, Z., Jokinen, A., Karny, M., Kugler, E., Kurcewicz, W., Köster, U., Lettry, J., Nieminen, A., Partes, K., Ramdhane, M., Ravn, H. L., Rykaczewski, K., Szerypo, J., Van de Vel, K., Van Duppen, P., Weissman, L., Walter, G., Wöhr, A., IS387 Collaboration, and ISOLDE Collaboration

Published
2003
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36. Beta-decay of the N = Z nucleus 72Kr

Author

Piqueras, I., Borge, M.J.G., Dessagne, Ph., Giovinazzo, J., Huck, A., Jokinen, A., Knipper, A., Longour, C., Marguier, G., Ramdhane, M., Rauch, V., Tengblad, O., Walter, G., Miehé, Ch., and and the ISOLDE Collaboration

Published
2003
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38. Nuclear spectroscopy at 133Sn

Author

Hoff, P., Baumann, P., Huck, A., Knipper, A., Walter, G., Marguier, G., Fogelberg, B., Lindroth, A., Mach, H., Sanchez-Vega, M., Taylor, R.B.E., van Duppen, P., Jokinen, A., Lindroos, M., Ramdhane, M., Kurcewicz, W., Jonson, B., Nyman, G., Jading, Y., Kratz, K.-L., Wöhr, A., Løvhøiden, G., Thorsteinsen, T.F., and Blomqvist, J.

Published
2000
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39. Laser ionization in β decay studies of Zn and Mn nuclei

Author

Oinonen, M., Jading, Y., Köster, U., Lettry, J., Ravn, H., Äystö, J., Dendooven, P., Huikari, J., Jokinen, A., Lipas, P.O., Nieminen, A., Peräjärvi, K., Siiskonen, T., Baumann, P., Huck, A., Knipper, A., Ramdhane, M., Walter, G., Didierjean, F., Fedoseyev, V.N., Mishin, V.I., Koizumi, M., Liu, W., Roeckl, E., and Sebastian, V.

Published
2000
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40. The decay of the neutron–rich nucleus 216Bi

Author

Kurpeta, J., Andreyev, A., Äystö, J., Evensen, A.-H., Huhta, M., Huyse, M., Jokinen, A., Karny, M., Kugler, E., Lettry, J., Nieminen, A., Płochocki, A., Ramdhane, M., Ravn, H.L., Rykaczewski, K., Szerypo, J., Van Duppen, P., Walter, G., Wöhr, A., and The ISOLDE Collaboration

Published
2000
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41. Beta decay of 61Ga

Author

Oinonen, M., Baumann, P., Dendooven, P., Fujita, Y., Górska, M., Grawe, H., Hu, Z., Janas, Z., Jokinen, A., Kirchner, R., Klepper, O., Knipper, A., Liu, W., Penttilä, H., Plochocki, A., Ramdhane, M., Roeckl, E., Walter, G., and Äystö, J.

Published
1999
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45. Excitations of the magic N=50 neutron-core revealed in Ga 81

Author

Dudouet, J., Lemasson, A., Maquart, G., Nowacki, F., Verney, D., Rejmund, M., Duchêne, G., Stezowski, O., Clément, E., Michelagnoli, C., Korichi, A., Andreoiu, C., Astier, A., De Angelis, G., De France, G., Delafosse, C., Deloncle, I., Didierjean, F., Dombrádi, Zs., Ducoin, C., Gadea, Andrés, Gottardo, A., Guinet, D., Jacquot, B., Jones, P., Konstantinopoulos, T., Kuti, I., Le Blanc, F., Lenzi, Silvia M., Li, G., Lozeva, R., Million, B., Napoli, D.R., Navin, A., Pérez-Vidal, R. M., Petrache, C.M., Ralet, D., Ramdhane, M., Redon, N., Schmitt, C., Sohler, D., Ministerio de Economía y Competitividad (España), and Ministerio de Ciencia, Innovación y Universidades (España)

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Physics::Atomic and Molecular Clusters, Nuclear Experiment
Abstract

The high-spin states of the neutron-rich Ga81, with three valence protons outside a Ni78 core, were measured. The measurement involved prompt γ-ray spectroscopy of fission fragments isotopically identified using the combination of the variable mode spectrometer (VAMOS++) and the advanced gamma tracking array (AGATA). The new γ-ray transitions, observed in coincidence with Ga81 ions, and the corresponding level scheme do not confirm the high-spin levels reported earlier. The newly observed high-spin states in Ga81 are interpreted using the results of state-of-the-art large-scale shell model (LSSM) calculations. The lower excitation energy levels are understood as resulting from the recoupling of three valence protons to the closed doubly magic core, while the highest excitation energy levels correspond to excitations of the magic N=50 neutron core. These results support the doubly magic character of Ni78 and the persistence of the N=50 shell closure but also highlight the presence of strong proton-neutron correlations associated with the promotion of neutrons across the magic N=50 shell gap, only few nucleons away from Ni78.

Published
2019

46. Proton instability of73Rb

Author

Jokinen, A., Oinonen, M., Äystö, J., Baumann, P., Didierjean, F., Hoff, P., Huck, A., Knipper, A., Marguier, G., Novikov, Yu. N., Popov, A. V., Ramdhane, M., Seliverstov, D. M., Van Duppen, P., Walter, G., and the ISOLDE-Collaboration

Published
1996
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47. Excitations of the magic $N=50$ neutron-core revealed in $^{81}$Ga

Author

Dudouet, J., Lemasson, A., Maquart, G., Nowacki, F., Verney, D., Rejmund, M., Duchêne, G., Stezowski, O., Clément, E., Michelagnoli, C., Korichi, A., Andreoiu, C., Astier, A., De Angelis, G., De France, G., Delafosse, C., Deloncle, I., Didierjean, F., Dombradi, Z., Ducoin, C., Gadea, A., Gottardo, A., Guinet, D., Jacquot, B., Jones, P., Konstantinopoulos, T., Kuti, I., Le Blanc, F., Lenzi, S.M., Li, G., Lozeva, R., Million, B., Napoli, D.R., Navin, A., Pérez-Vidal, R.M., Petrache, C.M., Ralet, D., Ramdhane, M., Redon, N., Schmitt, C., Sohler, D., 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), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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), Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), 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), 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), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Physics::Atomic and Molecular Clusters, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, Nuclear Structure
Abstract

International audience; The high-spin states of the neutron-rich Ga81, with three valence protons outside a Ni78 core, were measured. The measurement involved prompt γ-ray spectroscopy of fission fragments isotopically identified using the combination of the variable mode spectrometer (VAMOS++) and the advanced gamma tracking array (AGATA). The new γ-ray transitions, observed in coincidence with Ga81 ions, and the corresponding level scheme do not confirm the high-spin levels reported earlier. The newly observed high-spin states in Ga81 are interpreted using the results of state-of-the-art large-scale shell model (LSSM) calculations. The lower excitation energy levels are understood as resulting from the recoupling of three valence protons to the closed doubly magic core, while the highest excitation energy levels correspond to excitations of the magic N=50 neutron core. These results support the doubly magic character of Ni78 and the persistence of the N=50 shell closure but also highlight the presence of strong proton-neutron correlations associated with the promotion of neutrons across the magic N=50 shell gap, only few nucleons away from Ni78.

Published
2019

48. Diamond-based detector development for medical and nuclear applications

Author

Gallin-Martel, M.L., Abbassi, L., Adam, J.-F., Brambilla, S., Bes, A., Bosson, G., Collot, J., Crozes, T., Curtoni, S., Dauvergne, D., de Nolf, W., Fontana, M., Gallin-Martel, L., Ghimouz, A., Hostachy, J.Y., Iskra, L., Jastrzab, M., Kessedjian, G., Kim, Y.H., Köester, U., Lacoste, A., Marcatili, S., Morse, J., Motte, J.-F., Muraz, J.F., Ramdhane, M., Rarbi, F., Rossetto, O., Rosuel, N., Sage, C., Salomé, M., Testa, E., Tribouilloy, L., Yamouni, M., Rayet, Béatrice, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Nanofab (Nanofab ), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), ID17 - Bio-medical Beamline, European Synchrotron Radiation Facility (ESRF), Istituto Nazionale di Fisica Nucleare, Sezione di Milano (INFN), Istituto Nazionale di Fisica Nucleare (INFN), Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), and ILL

Subjects
[PHYS.PHYS.PHYS-MED-PH] Physics [physics]/Physics [physics]/Medical Physics [physics.med-ph], [PHYS.PHYS.PHYS-INS-DET] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], [PHYS.PHYS.PHYS-MED-PH]Physics [physics]/Physics [physics]/Medical Physics [physics.med-ph], [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2019

49. Proton instability of 73Rb

Author

Jokinen, A., Oinonen, M., Äystö, J., Baumann, P., Didierjean, F., Hoff, P., Huck, A., Knipper, A., Marguier, G., Novikov, Yu. N., Popov, A. V., Ramdhane, M., Seliverstov, D. M., Van Duppen, P., Walter, G., and the ISOLDE-Collaboration

Published
1996
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50. A step further in the A = 33−35, N ≃ 21, island of inversion: the structure of 33Mg

Author

ISOLDE collaboration, Nummela, S., Nowacki, F., Baumann, P., Caurier, E., Cederkäll, J., Courtin, S., Dessagne, Ph., Jokinen, A., Knipper, A., Le Scornet, G., Lyapin, L. G., Miehé, C., Oinonen, M., Poirier, E., Radivojevic, Z., Ramdhane, M., Trzaska, W. H., Walter, G., Äystö, J., Äystö, Juha, editor, Dendooven, Peter, editor, Jokinen, Ari, editor, and Leino, Matti, editor

Published
2003
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