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1. Evidence for coexisting shapes in $^{98}$Zr through lifetime measurements

Author

Singh, Purnima, Korten, W., Hagen, T. W., Görgen, A., Grente, L., Salsac, M. -D., Farget, F., Clément, E., de France, G., Braunroth, T., Bruyneel, B., Celikovic, I., Delaune, O., Dewald, A., Dijon, A., Delaroche, J. -P., Girod, M., Hackstein, M., Jacquot, B., Libert, J., Litzinger, J., Ljungvall, J., Louchart, C., Gottardo, A., Michelagnoli, C., Müller-Gatermann, C., Napoli, D. R., Otsuka, T., Pillet, N., Recchia, F., Rother, W., Sahin, E., Siem, S., Sulignano, B., Togashi, T., Tsunoda, Y., Theisen, Ch., and Valiente-Dobon, J. J.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

The lifetimes of first excited 2$^+$, 4$^+$ and 6$^+$ states in $^{98}$Zr were measured with the Recoil-Distance Doppler Shift method in an experiment performed at GANIL. Excited states in $^{98}$Zr were populated using the fission reaction between a 6.2 MeV/u $^{238}$U beam and a $^{9}$Be target. The $\gamma$ rays were detected with the EXOGAM array in correlation with the fission fragments identified in mass and atomic number in the VAMOS++ spectrometer. Our result shows very small B(E2;2$_1^+$ $\rightarrow$ 0$_1^+$) value in $^{98}$Zr thereby confirming the very sudden onset of collectivity at $N=60$. The experimental results are compared to large-scale Monte Carlo Shell model and beyond mean field calculations. The present results indicate coexistence of two additional deformed shapes in this nucleus along with the spherical ground state.

Published
2019
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2. Fission-fragment yields measured in Coulomb-induced fission of 234,235,236,238U and 237,238Np with the R3B/SOFIA setup

Author

Chatillon A., Boutoux G., Gorbinet T., Grente L., Martin J.-F., Pellereau E., Taieb J., Alvarez-Pol H., Audouin L., Ayyad Y., Bélier G., Benlliure J., Caamaño M., Casarejos E., Cortina-Gil D., Ebran A., Farget F., Fernández-Domínguez B., Heinz A., Johansson H. T., Jurado B., Kelić-Heil A., Kurz N., Laurent B., Loeher B., Nociforo C., Paradela C., Pietri S., Prochazka A., Ramos D., Rodríguez-Sànchez J. L., Rodriguez C., Rossi D., Simon H., Tassan-Got L., Toernqvist H., Vargas J., Voss B., and Weick H.

Subjects
Physics, QC1-999
Abstract

Low energy fission of 234,235,236,238U and 237,238Np radioactive beams, provided by the GSI/FRS facility, has been studied using the R3B/SOFIA setup. The latter allows, on an event-by-event basis, to simultaneously identify, in terms of their mass and atomic numbers, the fissioning nucleus in coincidence with both fission fragments after prompt-neutron emission. This presentation reports on new results on elemental, isobaric and isotopic yields.

Published
2023
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3. Fragmentation-induced fission reactions of 236U in inverse kinematics to investigate the pre-fragment angular momentum parameterizations

Author

Rodríguez-Sánchez J.L., Feijoo M., Benlliure J., Chatillon A., Taïeb J., Audouin L., Alvarez-Pol H., Ayyad Y., Bélier G., Boutoux G., Caamaño M., Casarejos E., Cortina-Gil D., Farget F., Fernández-Domínguez B., Gorbinet T., Grente L., Heinz A., Johansson H.T., Jurado B., Kelić-Heil A., Körper D., Kurz N., Laurent B., Lindberg S., Löher B., Martin J.-F., Nociforo C., Paradela C., Pietri S., Ramos D., Rodríguez-Tajes C., Simon H., Törnqvist H.T., Voss B., Weick H., and Yan Y.

Subjects
Physics, QC1-999
Abstract

In the last decades, measurements of spallation, fragmentation and Coulex induced fission reactions in inverse kinematics have provided valuable data to accurately investigate the fission dynamics and nuclear structure at large deformations of a large variety of stable and non-stable heavy nuclei. The collected data were used to constrain dynamic and nuclear structure parameters of different de-excitation models, such as ABLA and GEF, but the data can also be used to constrain the parameterizations describing the pre-fragment properties after the nuclear collision, such as the angular momentum gained by the pre-fragment. In this work, the fissioning system yields are compared to calculations assuming different parameterizations for modeling the angular momentum gained by the compound nuclei. Our findings indicate that the parameterizations utilized by abrasion models clearly underestimate the angular momentum, resulting in the underestimation of the production of lighter fissioning systems.

Published
2023
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4. Fragmentation-induced fission reactions of 236U in inverse kinematics to investigate the pre-fragment angular momentum parameterizations.

Author

Rodríguez-Sánchez, J.L., Feijoo, M., Benlliure, J., Chatillon, A., Taïeb, J., Audouin, L., Alvarez-Pol, H., Ayyad, Y., Bélier, G., Boutoux, G., Caamaño, M., Casarejos, E., Cortina-Gil, D., Farget, F., Fernández-Domínguez, B., Gorbinet, T., Grente, L., Heinz, A., Johansson, H.T., and Jurado, B.

Subjects
FISSION neutrons, ANGULAR momentum (Mechanics), NUCLEAR energy, COLLISIONS (Nuclear physics), HEAVY nuclei
Abstract

In the last decades, measurements of spallation, fragmentation and Coulex induced fission reactions in inverse kinematics have provided valuable data to accurately investigate the fission dynamics and nuclear structure at large deformations of a large variety of stable and non-stable heavy nuclei. The collected data were used to constrain dynamic and nuclear structure parameters of different de-excitation models, such as ABLA and GEF, but the data can also be used to constrain the parameterizations describing the pre-fragment properties after the nuclear collision, such as the angular momentum gained by the pre-fragment. In this work, the fissioning system yields are compared to calculations assuming different parameterizations for modeling the angular momentum gained by the compound nuclei. Our findings indicate that the parameterizations utilized by abrasion models clearly underestimate the angular momentum, resulting in the underestimation of the production of lighter fissioning systems. [ABSTRACT FROM AUTHOR]

Published
2023
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5. Fission-fragment yields measured in Coulomb-induced fission of 234,235,236,238U and 237,238Np with the R3B/SOFIA setup.

Author

Chatillon, A., Boutoux, G., Gorbinet, T., Grente, L., Martin, J.-F., Pellereau, E., Taieb, J., Alvarez-Pol, H., Audouin, L., Ayyad, Y., Bélier, G., Benlliure, J., Caamaño, M., Casarejos, E., Cortina-Gil, D., Ebran, A., Farget, F., Fernández-Domínguez, B., Heinz, A., and Johansson, H. T.

Subjects
NUCLEAR fission, RADIOISOTOPES, RADIOACTIVE nuclear beams, NEUTRON emission, NUCLEAR structure
Abstract

Low energy fission of 234,235,236,238U and 237,238Np radioactive beams, provided by the GSI/FRS facility, has been studied using the R3B/SOFIA setup. The latter allows, on an event-by-event basis, to simultaneously identify, in terms of their mass and atomic numbers, the fissioning nucleus in coincidence with both fission fragments after prompt-neutron emission. This presentation reports on new results on elemental, isobaric and isotopic yields. [ABSTRACT FROM AUTHOR]

Published
2023
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6. Lifetimes of excited states in triaxially deformed 107Tc and 109,111,113Rh

Author

Hagen, T. W., Görgen, A., Korten, W., Grente, L., Salsac, M. -D., Farget, F., Braunroth, T., Bruyneel, B., Celikovic, I., Clément, E., de France, G., Delaune, O., Dewald, A., Dijon, A., Hackstein, M., Jacquot, B., Litzinger, J., Ljungvall, J., Louchart, C., Michelagnoli, C., Napoli, D. R., Recchia, F., Rother, W., Sahin, E., Siem, S., Sulignano, B., Theisen, Ch., and Valiente-Dobon, J. J.

Published
2018
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7. Influence of proton and neutron deformed shells on the asymmetric fission of thorium isotopes

Author

Chatillon, A., primary, Taïeb, J., additional, Heinz, A., additional, Alvarez-Pol, H., additional, Audouin, L., additional, Ayyad, Y., additional, Bélier, G., additional, Benlliure, J., additional, Boutoux, G., additional, Caamaño, M., additional, Casarejos, E., additional, Cortina-Gil, D., additional, Ebran, A., additional, Farget, F., additional, Fernández-Domínguez, B., additional, Gorbinet, T., additional, Grente, L., additional, Johansson, H. T., additional, Jurado, B., additional, Kelić-Heil, A., additional, Kurz, N., additional, Laurent, B., additional, Martin, J.-F., additional, Nociforo, C., additional, Paradela, C., additional, Pellereau, E., additional, Pietri, S., additional, Prochazka, A., additional, Rodríguez-Sánchez, J. L., additional, Rossi, D., additional, Simon, H., additional, Tassan-Got, L., additional, Vargas, J., additional, Voss, B., additional, and Weick, H., additional

Published
2022
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8. High-precision measurement of isotopic fission yields of 236U

Author

Audouin L., Taieb J., Chatillon A., Grente L., Boutoux G., Gorbinet T., Martin J.-F., Alvarez-Pol H., Ayyad Y., Bélier G., Benlliure J., Caamaño M., Casarejos E., Cortina-Gil D., Farget F., Fernández-Domínguez B., Heinz A., Johansson H., Jurado B., Kelić-Heil A., Kurz N., Laurent B., Lindberg S., Löher B., Nociforo C., Paradela C., Pietri S., Ramos D., Rodriguez-Sanchez J.-L., Rodrìguez-Tajes C., Rossi D., Schmidt K.-H., Simon H., Tassan-Got L., Törnqvist H., Voss B., Weick H., and Yan Y.

Subjects
Physics, QC1-999
Abstract

We report on the second SOFIA experiment, dedicated to the fission yields of 236U*, analog to 235U(n,f). The measurement is based on the inverse kinematics method, using a relativistic, secondary beam of 236U. Both fission fragments are identified in mass and charge in the SOFIA recoil spectrometer. The obtained isotopic yields are compared with existing spectroscopy measurements and the elemental yields are used to discuss the treatment of the even-odd effect with energy in nuclear data libraries.

Published
2018
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9. Fission-fragment yields and prompt-neutron multiplicity for Coulomb-induced fission of U234,235 and Np237,238

Author

Martin, J.-F., primary, Taïeb, J., additional, Boutoux, G., additional, Chatillon, A., additional, Gorbinet, T., additional, Pellereau, E., additional, Audouin, L., additional, Heinz, A., additional, Alvarez-Pol, H., additional, Ayyad, Y., additional, Bélier, G., additional, Benlliure, J., additional, Caamaño, M., additional, Casarejos, E., additional, Cortina-Gil, D., additional, Ebran, A., additional, Farget, F., additional, Fernández-Domínguez, B., additional, Grente, L., additional, Johansson, H. T., additional, Jurado, B., additional, Kelić-Heil, A., additional, Kurz, N., additional, Laurent, B., additional, Nociforo, C., additional, Paradela, C., additional, Pietri, S., additional, Prochazka, A., additional, Rodríguez-Sánchez, J. L., additional, Rossi, D., additional, Simon, H., additional, Tassan-Got, L., additional, Vargas, J., additional, Voss, B., additional, and Weick, H., additional

Published
2021
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10. Fission-fragment yields and prompt-neutron multiplicity for Coulomb-induced fission of $^{234,235}\mathrm{U}$ and $^{237,238}\mathrm{Np}$

Author

Martin, J.-F., Taïeb, J., Boutoux, G., Chatillon, A., Gorbinet, T., Pellereau, E., Audouin, L., Heinz, A., Alvarez-Pol, H., Ayyad, Y., Bélier, G., Benlliure, J., Caamaño, M., Casarejos, E., Cortina-Gil, D., Ebran, A., Farget, F., Fernández-Domínguez, B., Grente, L., Johansson, H.T., Jurado, B., Kelić-Heil, A., Kurz, N., Laurent, B., Nociforo, C., Paradela, C., Pietri, S., Prochazka, A., Rodríguez-Sánchez, J.L., Rossi, D., Simon, H., Tassan-Got, L., Vargas, J., Voss, B., Weick, H., Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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), 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 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), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and 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)

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

International audience; Low-energy fission of U234,235 and Np237,238 radioactive beams, provided by the Fragment Separator (FRS) of the GSI Helmholtzzentrum für Schwerionenforschung facility (GSI), has been studied using the Reactions with Relativistic Radioactive Beams / Studies on Fission with Aladin (R3B/SOFIA) setup. The latter allows us, on an event-by-event basis, to simultaneously identify, in terms of their mass and atomic numbers, the fissioning nucleus in coincidence with both fission fragments after prompt-neutron emission. This article reports new results on elemental, isotonic, isobaric, and isotopic yields. Moreover, the high accuracy of our data allowed us to study in detail proton even-odd staggering, from elemental yields; neutron excess, from isotopic yields; and total prompt-neutron multiplicity, from the difference of masses of the fissioning nucleus and fission fragments. These results are then compared to previous experimental data in order to probe how these fission observables change as function of the excitation energy and atomic and neutron numbers of the compound nucleus.

Published
2021
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11. Accurate measurements of fission-fragment yields in 234,235,236,238U(γ,f) with the SOFIA set-up

Author

Chatillon A., Taïeb J., Martin J.-F., Pellereau E., Boutoux G., Gorbinet T., Grente L., Bélier G., Laurent B., Alvarez-Pol H., Ayyad Y., Benlliure J., Caamaño M., Audouin L., Casarejos E., Cortina-Gil D., Farget F., Fernández-Domínguez B., Heinz A., Jurado B., Kelić-Heil A., Kurz N., Lindberg S., Löher B., Nociforo C., Paradela C., Pietri S., Ramos D., Rodriguez-Sanchez J.-L., Rodrìguez-Tajes C., Rossi D., Schmidt K.-H., Simon H., Tassan-Got L., Törnqvist H., Vargas J., Voss B., Weick H., and Yan Y.

Subjects
Physics, QC1-999
Abstract

SOFIA (Studies On Fission with Aladin) is a new experimental set-up dedicated to accurate measurement of fission-fragments isotopic yields. It is located at GSI, the only place to use inverse kinematics at relativistic energies in order to study the (γ,f) electromagnetic-induced fission. The SOFIA set-up is a large-acceptance magnetic spectrometer, which allows to fully identify both fission fragments in coincidence on the whole fission-fragment range. This paper will report on fission yields obtained in 234,235,236,238U(γ,f) reactions.

Published
2016
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12. The SOFIA experiment: Measurement of 236U fission fragment yields in inverse kinematics

Author

Grente L., Taïeb J., Chatillon A., Martin J.-F., Pellereau É, Boutoux G., Gorbinet T., Bélier G., Laurent B., Alvarez-Pol H., Ayyad Y., Benlliure J., Caamaño M., Audouin L., Casarejos E., Cortina-Gil D., Farget F., Fernández-Domínguez B., Heinz A., Jurado B., Kelić-Heil A., Kurz N., Lindberg S., Löher B., Nociforo C., Paradela C., Pietri S., Ramos D., Rodriguez-Sanchez J.-L., Rodríguez-Tajes C., Rossi D., Schmidt K.-H., Simon H., Tassan-Got L., Törnqvist H., Vargas J., Voss B., Weick H., and Yan Y.

Subjects
Physics, QC1-999
Abstract

The SOFIA (Studies On FIssion with Aladin) experiment aims at measuring fission-fragments isotopic yields with high accuracy using inverse kinematics at relativistic energies. This experimental technique allows to fully identify the fission fragments in nuclear charge and mass number, thus providing very accurate isotopic yields for low energy fission of a large variety of fissioning systems. This report focuses on the latest results obtained with this set-up concerning electromagnetic-induced fission of 236U.

Published
2016
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13. Evidence for a New Compact Symmetric Fission Mode in Light Thorium Isotopes

Author

Chatillon, A., primary, Taïeb, J., additional, Alvarez-Pol, H., additional, Audouin, L., additional, Ayyad, Y., additional, Bélier, G., additional, Benlliure, J., additional, Boutoux, G., additional, Caamaño, M., additional, Casarejos, E., additional, Cortina-Gil, D., additional, Ebran, A., additional, Farget, F., additional, Fernández-Domínguez, B., additional, Gorbinet, T., additional, Grente, L., additional, Heinz, A., additional, Johansson, H. T., additional, Jurado, B., additional, Kelić-Heil, A., additional, Kurz, N., additional, Laurent, B., additional, Martin, J.-F., additional, Nociforo, C., additional, Paradela, C., additional, Pellereau, E., additional, Pietri, S., additional, Prochazka, A., additional, Rodríguez-Sánchez, J. L., additional, Rossi, D., additional, Simon, H., additional, Tassan-Got, L., additional, Vargas, J., additional, Voss, B., additional, and Weick, H., additional

Published
2020
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14. Lifetime measurements on fission fragments in the A ∼ 100 region

Author

Grente L., Salsac M.-D., Korten W., Görgen A., Hagen T. W., Braunroth T., Bruyneel B., Celikovic I., Clément E., Delaune O., Dijon A., Drouart A., Ertürk S., Farget F., de France G., Gottardo A., Hackstein M., Jacquot B., Libert J., Litzinger J., Ljungvall J., Louchart C., Michelagnoli C., Napoli D.R., Navin A., Pillet N., Pipidis A., Recchia F., Rejmund M., Rother W., Sahin E., Schmitt C., Siem S., Sulignano B., Valiente-Dobon J.J., and Zell K.O.

Subjects
Physics, QC1-999
Abstract

Lifetimes of first 4+ and 6+ states have been measured in neutron-rich isotopes of Zr, Mo, Ru and Pd using the recoil distance Doppler shift method at GANIL. The nuclei were produced through a fusion-fission reaction in inverse kinematics. The fission fragments were fully identified in the large-acceptance VAMOS spectrometer and γ-rays were detected in coincidence with the EXOGAM germanium array. Lifetimes of excited states in the range of 1–100 ps were measured with the Cologne plunger. Preliminary lifetime results are presented as well as a discussion on the evolution of the collectivity in this region.

Published
2013
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15. 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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16. $B(E2)$ anomalies in the yrast band of $^{170}\mathrm{Os}$

Author

Goasduff, A., Ljungvall, J., Rodríguez, T.R., Bello Garrote, F.L., Etile, A., Georgiev, G., Giacoppo, F., Grente, L., Klintefjord, M., Kuşoğlu, A., Matea, I., Roccia, S., Salsac, M.D., Sotty, C., 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), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), and 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)

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

International audience; Background: The neutron-deficient osmium isotopic chain provides a great laboratory for the study of shape evolution, with the transition from the soft triaxial rotor in Os168 to the well-deformed prolate rotor in Os180, while shape coexistence appears around N=96 in Os172. Therefore, the study of the Os isotopic chain should provide a better understanding of shape changes in nuclei and a detailed scrutiny of nuclear structure calculations. In this paper, the lifetimes of the low-lying yrast states of Os170 have been measured for the first time to investigate the shape evolution with neutron number. Purpose: Lifetimes of excited states in the ground-state band of Os170 are measured to investigate the shape evolution with neutron number in osmium isotopes and compare with state-of-the-art calculations. Methods: The states of interest were populated via the fusion-evaporation reaction Nd142(S32,4n) at a bombarding energy of 170 MeV at the ALTO facility from IPN (Orsay, France). Lifetimes of the 21+ and 41+ states in Os170 were measured with the recoil-distance Doppler-shift method using the Orsay universal plunger system. Results: Lifetimes of the two first excited states in Os170 were measured for the first time. A very small B(E2;41+→21+)/B(E2;21+→01+)=0.38(11) was found, which is very uncharacteristic for collective nuclei. These results were compared to state-of-the-art beyond-mean-field calculations. Conclusions: Although theoretical results give satisfactory results for the energy of the first few excited states in Os170 and the B(E2;21+→01+) they fail to reproduce the very small B(E2;41+→21+), which remains a puzzle.

Published
2019
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17. Evidence for Coexisting Shapes through Lifetime Measurements in $^{98}\mathrm{Zr}$

Author

Singh, P, Korten, W, Hagen, TW, Görgen, A, Grente, L, Salsac, M-D, Farget, F, Clément, E, de France, G, Braunroth, T, Bruyneel, B, Celikovic, I, Delaune, O, Dewald, A, Dijon, A, Delaroche, J-P, Girod, M, Hackstein, M, Jacquot, B, Libert, J, Litzinger, J, Ljungvall, J, Louchart, C, Gottardo, A, Michelagnoli, C, Müller-Gatermann, C, Napoli, DR, Otsuka, T, Pillet, N, Recchia, F, Rother, W, Sahin, E, Siem, S, Sulignano, B, Togashi, T, Tsunoda, Y, Theisen, C, and Valiente-Dobon, JJ

Abstract

The lifetimes of the first excited 2^{+}, 4^{+}, and 6^{+} states in ^{98}Zr were measured with the recoil-distance Doppler shift method in an experiment performed at GANIL. Excited states in ^{98}Zr were populated using the fission reaction between a 6.2 MeV/u ^{238}U beam and a ^{9}Be target. The γ rays were detected with the EXOGAM array in correlation with the fission fragments identified by mass and atomic number in the VAMOS++ spectrometer. Our result shows a very small B(E2;2_{1}^{+}→0_{1}^{+}) value in ^{98}Zr, thereby confirming the very sudden onset of collectivity at N=60. The experimental results are compared to large-scale Monte Carlo shell model and beyond-mean-field calculations. The present results indicate the coexistence of two additional deformed shapes in this nucleus along with the spherical ground state. ispartof: PHYSICAL REVIEW LETTERS vol:121 issue:19 pages:192501-192501 ispartof: location:United States status: published

Published
2018

18. Fission in inverse kinematics

Author

Audouin, L., Grente, L., Taieb, J., Chatillon, A., 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), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and SOFIA

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

International audience; Fission is a unique tool to study nuclear properties. The SOFIA Collaboration takes advantage of the inverse kinematics technique to measure fission yields for a large range of systems, including exotic nuclei. Both fragments are fully identified in charge and mass, a unique feature. The use of Coulomb interaction as fission trigger results in a low excitation energy in the fissioning system, allowing to study the influence of nuclear structure on fission. Using samples of SOFIA results, this paper addresses some open questions about fission such as the evolution of elemental yields with mass and the transition between asymmetric and symmetric fission.

Published
2018
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19. B(E2) anomalies in the yrast band of Os170

Author

Goasduff, A., primary, Ljungvall, J., additional, Rodríguez, T. R., additional, Bello Garrote, F. L., additional, Etile, A., additional, Georgiev, G., additional, Giacoppo, F., additional, Grente, L., additional, Klintefjord, M., additional, Kuşoğlu, A., additional, Matea, I., additional, Roccia, S., additional, Salsac, M.-D., additional, and Sotty, C., additional

Published
2019
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20. Experimental study of nuclear fission along the thorium isotopic chain: From asymmetric to symmetric fission

Author

Chatillon, A., primary, Taïeb, J., additional, Alvarez-Pol, H., additional, Audouin, L., additional, Ayyad, Y., additional, Bélier, G., additional, Benlliure, J., additional, Boutoux, G., additional, Caamaño, M., additional, Casarejos, E., additional, Cortina-Gil, D., additional, Ebran, A., additional, Farget, F., additional, Fernández-Domínguez, B., additional, Gorbinet, T., additional, Grente, L., additional, Heinz, A., additional, Johansson, H. T., additional, Jurado, B., additional, Kelić-Heil, A., additional, Kurz, N., additional, Laurent, B., additional, Martin, J.-F., additional, Nociforo, C., additional, Paradela, C., additional, Pellereau, E., additional, Pietri, S., additional, Prochazka, A., additional, Rodríguez-Sánchez, J. L., additional, Simon, H., additional, Tassan-Got, L., additional, Vargas, J., additional, Voss, B., additional, and Weick, H., additional

Published
2019
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21. EXILL—a high-efficiency, high-resolution setup for $\gamma$-spectroscopy at an intense cold neutron beam facility

Author

Jentschel, M., Blanc, A., De France, G., Köster, U., Leoni, S., Mutti, P., Simpson, G., Soldner, T., Ur, C., Urban, W., Ahmed, S., Astier, A., Augey, L., Back, T., Ba̧czyk, P., Bajoga, A., Balabanski, D., Belgya, T., Benzoni, G., Bernards, C., Biswas, D.C., Bocchi, G., Bottoni, S., Britton, R., Bruyneel, B., Burnett, J., Cakirli, R.B., Carroll, R., Catford, W., Cederwall, B., Celikovic, I., Cieplicka-Oryńczak, N., Clement, E., Cooper, N., Crespi, F., Csatlos, M., Curien, D., Czerwiński, M., Danu, L.S., Davies, A., Didierjean, F., Drouet, F., Duchêne, G., Ducoin, C., Eberhardt, K., Erturk, S., Fraile, L.M., Gottardo, A., Grente, L., Grocutt, L., Guerrero, C., Guinet, D., Hartig, A.L., Henrich, C., Ignatov, A., Ilieva, S., Ivanova, D., John, B.V., John, R., Jolie, J., Kisyov, S., Krticka, M., Konstantinopoulos, T., Korgul, A., Krasznahorkay, A., Kröll, T., Kurpeta, J., Kuti, I., Lalkovski, S., Larijani, C., Leguillon, R., Lica, R., Litaize, O., Lozeva, R., Magron, C., Mancuso, C., Martinez, E.Ruiz, Massarczyk, R., Mazzocchi, C., Melon, B., Mengoni, D., Michelagnoli, C., Million, B., Mokry, C., Mukhopadhyay, S., Mulholland, K., Nannini, A., Napoli, D.R., Olaizola, B., Orlandi, R., Patel, Z., Paziy, V., Petrache, C., Pfeiffer, M., Pietralla, N., Podolyak, Z., Ramdhane, M., Redon, N., Regan, P., Regis, J.M., Regnier, D., Oliver, R.J., Rudigier, M., Runke, J., Rza̧ca-Urban, T., Saed-Samii, N., Salsac, M.D., Scheck, M., Schwengner, R., Sengele, L., Singh, P., Smith, J., Stezowski, O., Szpak, B., Thomas, T., Thürauf, M., Timar, J., Tom, A., Tomandl, I., Tornyi, T., Townsley, C., Tuerler, A., Valenta, S., Vancraeyenest, A., Vandone, V., Vanhoy, J., Vedia, V., Warr, N., Werner, V., Wilmsen, D., Wilson, E., Zerrouki, T., Zielinska, M., Institut Laue-Langevin (ILL), ILL, 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 Subatomique et de Cosmologie (LPSC), 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), 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), 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), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Institut National Polytechnique de Grenoble (INPG), CEA Cadarache, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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 Laue-Langevin ( ILL ), 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 Subatomique et de Cosmologie ( LPSC ), 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 ), 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 ), 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 ), Département de Physique Nucléaire (ex SPhN) ( DPHN ), Institut de Recherches sur les lois Fondamentales de l'Univers ( IRFU ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien ( IPHC ), Centre National de la Recherche Scientifique ( CNRS ) -Université de Strasbourg ( UNISTRA ), Institut National Polytechnique de Grenoble ( INPG ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ), 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 ), Werner, Volker -- 0000-0003-4001-0150, Regnier, David -- 0000-0002-0345-7271, Britton, Richard -- 0000-0001-8532-8504, Cederwall, Bo -- 0000-0003-1771-2656, Valenta, Stanislav -- 0000-0003-2479-1380, Schwengner, Ronald -- 0000-0002-7620-8882, Olaizola, Bruno -- 0000-0003-1604-0640, nannini, adriana -- 0000-0003-0659-7648, Lica, Razvan -- 0000-0001-7066-9787, Petrache, Costel -- 0000-0001-8419-1390, Scheck, Marcus -- 0000-0002-9624-3909, Fraile, Luis M -- 0000-0002-6281-3635, Napoli, Daniel R. -- 0000-0002-8154-6958, Soldner, Torsten -- 0000-0003-2468-5182, GOTTARDO, Andrea -- 0000-0002-0390-5767, Belgya, Tamas -- 0000-0003-4281-5470, Wilson, Emma -- 0000-0003-2695-9853, Clement, Emmanuel -- 0000-0003-1887-717X, de France, Gilles -- 0000-0002-7439-1759, Vedia, Victoria -- 0000-0001-6671-3888, Celikovic, Igor -- 0000-0002-5642-4393, Lozeva, Radomira -- 0000-0002-0024-7068, Lalkovski, Stefan -- 0000-0003-3069-9708, Bottoni, Simone -- 0000-0003-2249-4825, [Jentschel, M. -- Blanc, A. -- Koster, U. -- Mutti, P. -- Soldner, T. -- Urban, W. -- Michelagnoli, C.] Inst Laue Langevin, 71 Ave Martyrs, F-38042 Grenoble 9, France -- [de France, G. -- Celikovic, I. -- Clement, E. -- Michelagnoli, C.] GANIL, Bvd Becquerel,BP 55027, F-14076 Caen 05, France -- [Leoni, S. -- Benzoni, G. -- Bocchi, G. -- Bottoni, S. -- Crespi, F. -- Million, B. -- Vandone, V.] Univ Milan, Dipartimento Fis, Via Celoria 16, I-20133 Milan, Italy -- [Simpson, G.] Univ Grenoble Alpes, LPSC, F-38026 Grenoble, France -- [Ur, C.] Univ Padua, Dipartimento Fis, Via F Marzolo 8, I-35131 Padua, Italy -- [Ur, C. -- Balabanski, D.] ELI NP, IFIN HH30, Bucharest 077125, Romania -- [Urban, W. -- Czerwinski, M. -- Korgul, A. -- Kurpeta, J. -- Mazzocchi, C.] Univ Warsaw, Fac Phys, Ul Pasteura 5, PL-02093 Warsaw, Poland -- [Pfeiffer, M. -- Regis, J. M. -- Saed-Samii, N. -- Thomas, T. -- Warr, N.] Univ Cologne, IKP, Zulpicher Str 77, D-50937 Cologne, Germany -- [Astier, A. -- Konstantinopoulos, T. -- Lozeva, R. -- Petrache, C. -- Zerrouki, T.] Univ Paris Saclay, CNRS, IN2P3, CSNSM, F-91405 Orsay, France -- [Augey, L. -- Guinet, D. -- Redon, N. -- Stezowski, O.] Lyon Univ Claude Bernard, IPN, 43 Blvd 11 Nov 1918, F-69622 Villeurbanne, France -- [Back, T. -- Cederwall, B.] KTH, Phys Dept, Roslagstullsbacken 21, S-10044 Stockholm, Sweden -- [Bajoga, A. -- Britton, R. -- Carroll, R. -- Catford, W. -- Davies, A. -- Lalkovski, S. -- Patel, Z. -- Podolyak, Z. -- Regan, P. -- Rudigier, M. -- Tom, A.] Univ Surrey, Dept Phys, Guildford GU2 5XH, Surrey, England -- [Balabanski, D.] INRNE Sofia, 72 Tzarigradsko Shaussee, Sofia 1784, Bulgaria -- [Belgya, T.] Hungarian Acad Sci CER, Konkoly T St 29-33, H-1121 Budapest, Hungary -- [Bernards, C. -- Cooper, N. -- Werner, V.] Yale Univ, Dept Phys, POB 208120, New Haven, CT 06520 USA -- [Biswas, D. C. -- Danu, L. S. -- John, B. V. -- Mukhopadhyay, S.] Bhabha Atom Res Ctr, Nucl Phys Div, Mumbai 400085, Maharashtra, India -- [Bruyneel, B. -- Grente, L. -- Salsac, M. D. -- Zielinska, M.] CEA Saclay ORME Merisiers, DSM IRFU SPHN, Bat 703, F-91191 Gif Sur Yvette, France -- [Burnett, J.] AWE PLC, Reading RG7 4PR, Berks, England -- [Cakirli, R. B.] Istanbul Univ, Dept Phys, TR-34134 Istanbul, Turkey -- [Cieplicka-Oryn'czak, N. -- Szpak, B.] Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland -- [Csatlos, M. -- Krasznahorkay, A. -- Kuti, I. -- Timar, J. -- Tornyi, T.] Hungarian Acad Sci, Inst Nucl Res, H-4001 Debrecen, Hungary -- [Curien, D. -- Didierjean, F. -- Duche'ne, G. -- Lozeva, R. -- Sengele, L.] Univ Strasbourg, CNRS, IPHC, UMR 7178, F-67000 Strasbourg, France -- [Drouet, F. -- Vancraeyenest, A.] INPG PHELMA, 3 Parvis Louis Neel BP 257, F-38000 Grenoble 1, France -- [Eberhardt, K. -- Mokry, C. -- Runke, J.] Johannes Gutenberg Univ Mainz, Inst Kernchem, Fritz Strassmann Weg 2, D-55128 Mainz, Germany -- [Erturk, S.] Nigde Univ, Merkez Yerleske Bor Yolu Uzeri, TR-51240 Nigde, Turkey -- [Fraile, L. M. -- Olaizola, B. -- Paziy, V. -- Vedia, V.] Univ Complutense, Grp Fis Nucl, Fis Avda Complutense, Madrid 28040, Spain -- [Gottardo, A. -- Napoli, D. R. -- Wilson, E.] INFN, Lab Nazl Legnaro, Vialle Univ 2, I-35020 Legnaro, Italy -- [Grocutt, L. -- Mulholland, K. -- Scheck, M. -- Smith, J.] Univ West Scotland, High St, Paisley PA1 2BE, Renfrew, Scotland -- [Guerrero, C.] CERN, CH-1211 Geneva 23, Switzerland -- [Hartig, A. -L. -- Henrich, C. -- Ignatov, A. -- Ilieva, S. -- Kroell, T. -- Pietralla, N. -- Thuerauf, M. -- Werner, V.] Tech Univ Darmstadt, IKP, Schlossgartenstr 9, D-64289 Darmstadt, Germany -- [Ivanova, D. -- Kisyov, S.] Univ Sofia, Fac Phys, 5 James Bourchier Blvd, Sofia 1126, Bulgaria -- [John, R. -- Massarczyk, R. -- Schwengner, R.] Helmholtz Zentrum Dresden Rossendorf, POB 510119, D-01314 Dresden, Germany -- [Larijani, C.] Natl Phys Lab, Teddington Queens Rd, Teddington, Middx, England -- [Leguillon, R. -- Orlandi, R.] JAEA, Tokai Shirakata Shirane 2-4 Tokai, Naka, Ibaraki 3191195, Japan -- [Lica, R.] IFIN HH, Bucharest Str Atomistilor 407,POB MG 6, Bucharest 76900, Romania -- [Litaize, O. -- Regnier, D.] CEA Cadarache, F-13108 St Paul Les Durance, France -- [Magron, C.] Univ Bordeaux, CENBG Bordeaux, 1 Le Haut Vigneau, F-33170 Gradignan, France -- [Magron, C.] Univ Firenze, Dipartimento Fis & Astron, Via G Sansone 1, I-50019 Florence, Italy -- [Melon, B.] INFN, Sez Firenze, Via G Sansone 1, I-50019 Sesto Fiorentino, Italy -- [Ramdhane, M.] LPSC Grenoble, 53 Ave Martyrs, F-38026 Grenoble, France -- [Oliver, R. J.] Univ Brighton, Sch Environm & Technol, Lewes Rd, Brighton, E Sussex BN2 4GJ, England -- [Singh, P.] Tata Inst Fundamental Res, Homi Bhabha Rd, Mumbai 400005, Maharashtra, India -- [Tomandl, I.] ASCR, Nucl Phys Inst, Rez 25068, Czech Republic -- [Townsley, C.] Univ Sussex, Sch Sci & Technol, Brighton BN1 9QJ, E Sussex, England -- [Tuerler, A.] Univ Bern, Dept Chem & Biochem, Freiestr 3, CH-3012 Bern, Switzerland -- [Krticka, M. -- Valenta, S.] Prague Charles Univ, Fac Math & Phys, Ke Karlovu 5, Prague 12116, Czech Republic -- [Vanhoy, J.] US Naval Acad, Dept Phys, 572C Holloway Rd, Annapolis, MD 21402 USA, 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 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), 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), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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 National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), 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]), 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 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)

Subjects
Instrumentation for neutron sources, Spectrometers, Physics::Instrumentation and Detectors, Gamma detectors (scintillators, CZT, HPG, HgI etc), [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Detectors and Experimental Techniques, [ PHYS.PHYS.PHYS-INS-DET ] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det]
Abstract

WOS: 000414625700003, In the EXILL campaign a highly efficient array of high purity germanium (HPGe) detectors was operated at the cold neutron beam facility PF1B of the Institut Laue-Langevin (ILL) to carry out nuclear structure studies, via measurements of gamma-rays following neutron-induced capture and fission reactions. The setup consisted of a collimation system producing a pencil beam with a thermal capture equivalent flux of about 10(8) ns(-1)cm(2) at the target position and negligible neutron halo. The targetwas surrounded by an array of eight to ten anti-Compton shielded EXOGAMClover detectors, four to six anti-Compton shielded large coaxial GASP detectors and two standard Clover detectors. For a part of the campaign the array was combined with 16 LaBr3:(Ce) detectors from the FATIMA collaboration. The detectorswere arranged in an array of rhombicuboctahedron geometry, providing the possibility to carry out very precise angular correlation and directional-polarization correlation measurements. The triggerless acquisition system allowed a signal collection rate of up to 6 x 10(5) Hz. The data allowed to set multi-fold coincidences to obtain decay schemes and in combination with the FATIMA array of LaBr3:(Ce) detectors to analyze half-lives of excited levels in the pico-to microsecond range. Precise energy and efficiency calibrations of EXILL were performed using standard calibration sources of Ba-133, Co-60 and Eu-152 as well as data from the reactions Al-27(n, gamma)Al-28 and Cl-35(n,gamma)Cl-36 in the energy range from 30 keV up to 10MeV., U.S. DOE grant [DE-FG02-91ER40609]; NUPNET; German BMBF [O5P12PKNUF, 05P15RDFN1, 05P12RDNUP]; German DFG contract [KR 1796/2-1]; Polish National Science Centre [DEC-2013/09/B/ST2/03485], This work has been partly supported by the Polish National Science Centre under contract DEC-2013/09/B/ST2/03485, the U.S. DOE grant No. DE-FG02-91ER40609, the NUPNET and the German BMBF under contracts O5P12PKNUF, 05P15RDFN1 and 05P12RDNUP and the German DFG contract KR 1796/2-1.

Published
2017
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22. Evidence for Coexisting Shapes through Lifetime Measurements in $^{98}$Zr

Author

Singh, Purnima, Korten, W., Hagen, T.W., Görgen, A., Grente, L., Salsac, M.-D., Farget, F., Clément, E., De France, G., Braunroth, T., Bruyneel, B., Celikovic, I., Delaune, O., Dewald, A., Dijon, A., Delaroche, J.-P., Girod, M., Hackstein, M., Jacquot, B., Libert, J., Litzinger, J., Ljungvall, J., Louchart, C., Gottardo, A., Michelagnoli, C., Müller-Gatermann, C., Napoli, D.R., Otsuka, T., Pillet, N., Recchia, F., Rother, W., Sahin, E., Siem, S., Sulignano, B., Togashi, T., Tsunoda, Y., Theisen, Ch., Valiente-Dobon, J.J., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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), and 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)

Subjects
Physics and Astronomy (all), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, Nuclear Physics
Abstract

The lifetimes of the first excited 2^{+}, 4^{+}, and 6^{+} states in ^{98}Zr were measured with the recoil-distance Doppler shift method in an experiment performed at GANIL. Excited states in ^{98}Zr were populated using the fission reaction between a 6.2 MeV/u ^{238}U beam and a ^{9}Be target. The γ rays were detected with the EXOGAM array in correlation with the fission fragments identified by mass and atomic number in the VAMOS++ spectrometer. Our result shows a very small B(E2;2_{1}^{+}→0_{1}^{+}) value in ^{98}Zr, thereby confirming the very sudden onset of collectivity at N=60. The experimental results are compared to large-scale Monte Carlo shell model and beyond-mean-field calculations. The present results indicate the coexistence of two additional deformed shapes in this nucleus along with the spherical ground state.

Published
2018
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23. EXILL—a high-efficiency, high-resolution setup for γ-spectroscopy at an intense cold neutron beam facility

Author

Jentschel, M., Blanc, A., de France, G., Köster, U., Leoni, S., Mutti, P., Simpson, G., Soldner, T., Ur, C., Urban, W., Ahmed, S., Astier, A., Augey, L., Back, T., Ba̧czyk, P., Bajoga, A., Balabanski, D., Belgya, T., Benzoni, G., Bernards, C., Biswas, D.C., Bocchi, G., Bottoni, S., Britton, R., Bruyneel, B., Burnett, J., Cakirli, R.B., Carroll, R., Catford, W., Cederwall, B., Celikovic, I., Cieplicka-Oryńczak, N., Clement, E., Cooper, N., Crespi, F., Csatlos, M., Curien, D., Czerwiński, M., Danu, L.S., Davies, A., Didierjean, F., Drouet, F., Duchêne, G., Ducoin, C., Eberhardt, K., Erturk, S., Fraile, L.M., Gottardo, A., Grente, L., Grocutt, L., Guerrero, C., Guinet, D., Hartig, A.-L., Henrich, C., Ignatov, A., Ilieva, S., Ivanova, D., John, B.V., John, R., Jolie, J., Kisyov, S., Krticka, M., Konstantinopoulos, T., Korgul, A., Krasznahorkay, A., Kröll, T., Kurpeta, J., Kuti, I., Lalkovski, S., Larijani, C., Leguillon, R., Lica, R., Litaize, O., Lozeva, R., Magron, C., Mancuso, C., Martinez, E. Ruiz, Massarczyk, R., Mazzocchi, C., Melon, B., Mengoni, D., Michelagnoli, C., Million, B., Mokry, C., Mukhopadhyay, S., Mulholland, K., Nannini, A., Napoli, D.R., Olaizola, B., Orlandi, R., Patel, Z., Paziy, V., Petrache, C., Pfeiffer, M., Pietralla, N., Podolyak, Z., Ramdhane, M., Redon, N., Regan, P., Regis, J.M., Regnier, D., Oliver, R. J., Rudigier, M., Runke, J., Rza̧ca-Urban, T., Saed-Samii, N., Salsac, M.D., Scheck, M., Schwengner, R., Sengele, L., Singh, P., Smith, J., Stezowski, O., Szpak, B., Thomas, T., Thürauf, M., Timar, J., Tom, A., Tomandl, I., Tornyi, T., Townsley, C., Türler, Andreas, Valenta, S., Vancraeyenest, A., Vandone, V., Vanhoy, J., Vedia, V., Warr, N., Werner, V., Wilmsen, D., Wilson, E., Zerrouki, T., and Zielinska, M.

Subjects
Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, 540 Chemistry, 570 Life sciences, biology
Abstract

In the EXILL campaign a highly efficient array of high purity germanium (HPGe) detectors was operated at the cold neutron beam facility PF1B of the Institut Laue-Langevin (ILL) to carry out nuclear structure studies, via measurements of γ-rays following neutron-induced capture and fission reactions. The setup consisted of a collimation system producing a pencil beam with a thermal capture equivalent flux of about 108 n s−1cm−2 at the target position and negligible neutron halo. The target was surrounded by an array of eight to ten anti-Compton shielded EXOGAM Clover detectors, four to six anti-Compton shielded large coaxial GASP detectors and two standard Clover detectors. For a part of the campaign the array was combined with 16 LaBr3:(Ce) detectors from the FATIMA collaboration. The detectors were arranged in an array of rhombicuboctahedron geometry, providing the possibility to carry out very precise angular correlation and directional-polarization correlation measurements. The triggerless acquisition system allowed a signal collection rate of up to 6 × 105 Hz. The data allowed to set multi-fold coincidences to obtain decay schemes and in combination with the FATIMA array of LaBr3:(Ce) detectors to analyze half-lives of excited levels in the pico- to microsecond range. Precise energy and efficiency calibrations of EXILL were performed using standard calibration sources of 133Ba, 60Co and 152Eu as well as data from the reactions 27Al(n,γ)28Al and 35Cl(n,γ)36Cl in the energy range from 30 keV up to 10 MeV.

Published
2017
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24. In-beam gamma-ray spectroscopy of the neutron-rich platinum isotope 200Pt toward the N = 126 shell gap

Author

John, PR, Valiente-Dob on, JJ, Mengoni, D, Modamio, V, Lunardi, S, Bazzacco, D, Gadea, A, Wheldon, C, Rodr guez, TR, Alexander, T, de Angelis, G, Ashwood, N, Barr, M, Benzoni, G, Birkenbach, B, Bizzeti, PG, Bizzeti-Sona, AM, Bottoni, S, Bowry, M, Bracco, A, Browne, F, Bunce, M, Camera, F, Corradi, L, Crespi, FCL, Melon, B, Farnea, E, Fioretto, E, Gottardo, A, Grente, L, Hess, H, Kokalova, T, Mijatovi c, T, Montagnoli, G, Montanari, D, Napoli, DR, Podolyak, Zsolt, Pollarolo, G, Recchia, F, Reiter, P, Roberts, OJ, Sahin, E, Salsac, M-D, Scarlassara, F, Sferrazza, M, Soderstrom, P-A, Stefanini, AM, Szilner, S, Ur, CA, Vogt, A, and Walshe, A

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Nuclear Experiment
Abstract

The neutron-rich nucleus \nucleus{200}{Pt} is investigated via in-beam \gamma-ray spectroscopy in order to study the shape evolution in the neutron-rich platinum isotopes towards the N = 126 shell closure. The two-neutron transfer reaction \nucleus{198}{Pt}(\nucleus{82}{Se}, \nucleus{80}{Se})\nucleus{200}{Pt} is used to populate excited states of \nucleus{200}{Pt}. The Advanced Gamma Ray Tracking Array (AGATA) demonstrator coupled with the PRISMA spectrometer detects \gamma rays coincident with the \nucleus{80}{Se} recoils, the binary partner of \nucleus{200}{Pt}. The binary partner method is applied to extract the \gamma-ray transitions and build the level scheme of \nucleus{200}{Pt}. The level at 1884\,keV reported by Yates et. al [Phys. Rev. C 37, 1889] was confirmed to be at 1882.1\,keV and assigned as the (6^+_1) state. An additional \gamma ray was found and it presumably de-excites the (8^+_1) state. The results are compared with state-of-the-art beyond mean-field calculations, performed for the even-even \nucleus{190-204}{Pt} isotopes, revealing that \nucleus{200}{Pt} marks the transition from the \gamma-unstable behaviour of lighter Pt nuclei towards a more spherical one when approaching the N=126 shell closure.

Published
2017

25. Evidence for Coexisting Shapes through Lifetime Measurements in Zr98

Author

Singh, Purnima, primary, Korten, W., additional, Hagen, T. W., additional, Görgen, A., additional, Grente, L., additional, Salsac, M.-D., additional, Farget, F., additional, Clément, E., additional, de France, G., additional, Braunroth, T., additional, Bruyneel, B., additional, Celikovic, I., additional, Delaune, O., additional, Dewald, A., additional, Dijon, A., additional, Delaroche, J.-P., additional, Girod, M., additional, Hackstein, M., additional, Jacquot, B., additional, Libert, J., additional, Litzinger, J., additional, Ljungvall, J., additional, Louchart, C., additional, Gottardo, A., additional, Michelagnoli, C., additional, Müller-Gatermann, C., additional, Napoli, D. R., additional, Otsuka, T., additional, Pillet, N., additional, Recchia, F., additional, Rother, W., additional, Sahin, E., additional, Siem, S., additional, Sulignano, B., additional, Togashi, T., additional, Tsunoda, Y., additional, Theisen, Ch., additional, and Valiente-Dobon, J. J., additional

Published
2018
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26. Lifetimes of excited states in triaxially deformed Tc-107 and Rh-109,Rh-111,Rh-113

Author

Hagen, T. W., Gorgen, A., Korten, W., Grente, L., Salsac, M. -D., Farget, F., Braunroth, T., Bruyneel, B., Celikovic, I., Clement, E., de France, G., Delaune, O., Dewald, A., Dijon, A., Hackstein, M., Jacquot, B., Litzinger, J., Ljungvall, J., Louchart, C., Michelagnoli, C., Napoli, D. R., Recchia, F., Rother, W., Sahin, E., Siem, S., Sulignano, B., Theisen, Ch., Valiente-Dobon, J. J., Hagen, T. W., Gorgen, A., Korten, W., Grente, L., Salsac, M. -D., Farget, F., Braunroth, T., Bruyneel, B., Celikovic, I., Clement, E., de France, G., Delaune, O., Dewald, A., Dijon, A., Hackstein, M., Jacquot, B., Litzinger, J., Ljungvall, J., Louchart, C., Michelagnoli, C., Napoli, D. R., Recchia, F., Rother, W., Sahin, E., Siem, S., Sulignano, B., Theisen, Ch., and Valiente-Dobon, J. J.

Abstract

Lifetimes of excited states in Tc-107, Rh-109, Rh-111, and Rh-113 were measured at GANIL using the Recoil-Distance Doppler Shift method. The neutron-rich nuclei were produced in fission reactions in inverse kinematics with a U-238 beam impinging on a Be-9 target. Fission fragments were identified event-by-event in the ray-tracing spectrometer VAMOS++ and correlated with prompt gamma rays observed around the target position with the EXOGAM Ge detector array. Several lifetimes were obtained for states in the positiveparity yrast bands in the four nuclei and compared to triaxial particle-rotor calculations. The results clarify the configuration for the strongest positive-parity band in Tc-107 and suggest a gradual increase of triaxial deformation with atomic number Z, reaching almost maximum triaxiality for the neutron-rich Rh nuclei.

Published
2018

27. Evidence for Coexisting Shapes through Lifetime Measurements in Zr-98

Author

Singh, Purnima, Korten, W., Hagen, T. W., Gorgen, A., Grente, L., Salsac, M-D, Farget, F., Clement, E., de France, G., Braunroth, T., Bruyneel, B., Celikovic, I, Delaune, O., Dewald, A., Dijon, A., Delaroche, J-P, Girod, M., Hackstein, M., Jacquot, B., Libert, J., Litzinger, J., Ljungvall, J., Louchart, C., Gottardo, A., Michelagnoli, C., Mueller-Gatermann, C., Napoli, D. R., Otsuka, T., Pillet, N., Recchia, F., Rother, W., Sahin, E., Siem, S., Sulignano, B., Togashi, T., Tsunoda, Y., Theisen, Ch, Valiente-Dobon, J. J., Singh, Purnima, Korten, W., Hagen, T. W., Gorgen, A., Grente, L., Salsac, M-D, Farget, F., Clement, E., de France, G., Braunroth, T., Bruyneel, B., Celikovic, I, Delaune, O., Dewald, A., Dijon, A., Delaroche, J-P, Girod, M., Hackstein, M., Jacquot, B., Libert, J., Litzinger, J., Ljungvall, J., Louchart, C., Gottardo, A., Michelagnoli, C., Mueller-Gatermann, C., Napoli, D. R., Otsuka, T., Pillet, N., Recchia, F., Rother, W., Sahin, E., Siem, S., Sulignano, B., Togashi, T., Tsunoda, Y., Theisen, Ch, and Valiente-Dobon, J. J.

Abstract

The lifetimes of the first excited 2(+), 4(+), and 6(+) states in Zr-98 were measured with the recoil-distance Doppler shift method in an experiment performed at GANIL. Excited states in Zr-98 were populated using the fission reaction between a 6.2 MeV/u U-238 beam and a Be-9 target. The gamma rays were detected with the EXOGAM array in correlation with the fission fragments identified by mass and atomic number in the VAMOS++ spectrometer. Our result shows a very small B(E2; 2(1)(+) -> 0(1)(+)) value in Zr-98, thereby confirming the very sudden onset of collectivity at N = 60. The experimenta(l) results are compared to large-scale Monte Carlo shell model and beyond-mean-field calculations. The present results indicate the coexistence of two additional deformed shapes in this nucleus along with the spherical ground State.

Published
2018

28. Accurate isotopic fission yields of electromagnetically induced fission of $^{238}$U measured in inverse kinematics at relativistic energies

Author

Pellereau, E., Taïeb, J., Chatillon, A., Alvarez-Pol, H., Audouin, L., Ayyad, Y., Bélier, G., Benlliure, J., Boutoux, G., Caamaño, M., Casarejos, E., Cortina-Gil, D., Ebran, A., Farget, F., Fernández-Domínguez, B., Gorbinet, T., Grente, L., Heinz, A., Johansson, H., Jurado, B., Kelić-Heil, A., Kurz, N., Laurent, B., Martin, J.F., Nociforo, C., Paradela, C., Pietri, S., Rodríguez-Sánchez, J.L., Schmidt, K.H., Simon, H., Tassan-Got, L., Vargas, J., Voss, B., Weick, H., Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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), 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), 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 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)

Subjects
Nuclear Theory, Physics::Atomic and Molecular Clusters, ddc:530, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

International audience; SOFIA (Studies On Fission with Aladin) is a novel experimental program, dedicated to accurate measurements of fission-fragment isotopic yields. The setup allows us to fully identify, in nuclear charge and mass, both fission fragments in coincidence for the whole fission-fragment range. It was installed at the GSI facility (Darmstadt), to benefit from the relativistic heavy-ion beams available there, and thus to use inverse kinematics. This paper reports on fission yields obtained in electromagnetically induced fission of U238.

Published
2017
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29. EXILL - a high efficiency, high resolution setup for γ-spectroscopy at an intense cold neutron beam

Author

Jentschel, M., Blanca, A., France, G., Köster, U., Leoni, S., Mutti, P., Simpson, G., Soldner, T., Ur, C., Urban, W., Ahmed, S., Astieri, A., Augey, L., Back, T., Baczyk, P., Bajoga, A., Balabanski, D., Belgya, T., Benzoni, G., Bernards, C., Biswas, D., Bocchi, G., Bottoni, S., Britton, R., Bruyneel, B., Burnett, J., Cakirli, R. B., Carroll, R., Catford, W., Cederwall, B., Celikovic, I., Cieplicka, N., Clement, E., Cooper, N., Crespic, F., Csatlos, M., Czerwinski, M., Danu, L., Davies, A., Didierjean, F., Drouet, F., Duchene, G., Ducoin, C., Eberhardt, K., Erturk, S., Fraile, L. M., Gottardo, A., Grente, L., Grocutt, L., Guerrero, C., Guinet, D., Hartig, A.-L., Henrich, C., Ignatov, A., Ilieva, S., Ivanova, D., John, B., John, R., Jolie, J., Kisyov, S., Konstantinopoulos, T., Korgul, A., Krasznahorkay, A., Kröll, T., Kurpeta, J., Kutiu, I., Lalkovski, S., Larijani, C., Leguillon, R., Lica, R., Litaize, O., Magron, C., Mancuso, C., Ruiz Martinez, E., Massarczyk, R., Mazzocchi, C., Melon, B., Mengoni, D., Million, B., Mokry, C., Mukhopadhyay, S., Mulholland, K., Nannini, A., Napoli, D. R., Olaizola, B., Orlandi, R., Patel, Z., Paziy, V., Petrache, C., Pfeiffer, M., Podolyak, Z., Ramdhane, M., Redon, N., Regan, P., Regis, J. M., Regnier, D., Oliver, R. J., Rudigier, M., Runke, J., Rzaca-Urban, T., Saed-Samii, N., Salsacq, M. D., Scheck, M., Schwengner, R., Sengele, L., Singh, P., Smith, J., Stezowski, O., Szpak, B., Thomas, T., Thürauf, M., Timaru, J., Toml, A., Tomandl, I., Tornyi, T., Townsley, C., Tuerler, A., Valenta, S., Vancraeyenest, A., Vandone, V., Vanhoy, J., Vedia, V., Warr, N., Werner, V., Wilmsen, D., Wilson, E., Zerrouki, T., and Zielinska, M.

Subjects
235U, Ge detectors, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, neutron-induced fission, multiple-γ coincidences, (n,γ)-reactions, 241Pu, angular correlations
Abstract

In the EXILL campaign a highly efficient array of HPGe detectors was operated at the cold neutron beam instrument PF1B of the Institut Laue-Langevin to carry out nuclear structure studies, via measurements of -rays following neutron-induced capture and fission reactions. The setup consisted of a collimation system producing a pencil beam with a thermal capture equivalent flux of about 108 s-1 cm-2 at the target position and negligible neutron halo. The target was surrounded by an array of eight to ten anti-Compton shielded EXOGAM clover detectors, four to six anti-Compton shielded large coaxial GASP detectors and two smaller clover detectors. The detectors were arranged in an array of rhombicuboctahedron geometry, providing the possibility to carry out very precise angular correlation and directional-polarization correlation measurements. The trigger-less acquisition system allowed an event collection rate of up to 6 × 105 Hz. From triggerless collected data it was possible to construct decay schemes and in combination with the FATIMA array of LaBr3 detectors to analyze half-lives of excited levels in the pico- to micro-second range. Precise energy and efficiency calibrations of EXILL were performed using 27Al(n,γ)28Al and 35Cl(n,γ)36Cl reactions in the energy range from 30 keV up to 10 MeV.

Published
2017

30. In-beam gamma-ray spectroscopy of the neutron-rich platinum isotope Pt-200 toward the N=126 shell gap

Author

John, P. R., Valiente-Dobon, J. J., Mengoni, D., Modamio, V., Lunardi, S., Bazzacco, D., Gadea, A., Wheldon, C., Rodriguez, T. R., Alexander, T., de Angelis, G., Ashwood, N., Barr, M., Benzoni, G., Birkenbach, B., Bizzeti, P. G., Bizzeti-Sona, A. M., Bottoni, S., Bowry, M., Bracco, A., Browne, F., Bunce, M., Camera, F., Corradi, L., Crespi, F. C. L., Melon, B., Farnea, E., Fioretto, E., Gottardo, A., Grente, L., Hess, H., Kokalova, Tz., Korten, W., Kusoglu, A., Lenzi, S., Leoni, S., Ljungvall, J., Menegazzo, R., Michelagnoli, C., Mijatovic, T., Montagnoli, G., Montanari, D., Napoli, D. R., Podolyak, Zs., Pollarolo, G., Recchia, F., Reiter, P., Roberts, O. J., Sahin, E., Salsac, M. -D, Scarlassara, F., Sferrazza, M., Soderstrom, Pär-Anders, Stefanini, A. M., Szilner, S., Ur, C. A., Vogt, A., and Walshe, J.

Subjects
Subatomär fysik, Subatomic Physics
Abstract

The neutron-rich nucleus Pt-200 is investigated via in-beam gamma-ray spectroscopy to study the shape evolution in the neutron-rich platinum isotopes towards the N = 126 shell closure. The two-neutron transfer reaction Pt-198(Se-82, Se-80)Pt-200 is used to populate excited states of Pt-200. The Advanced Gamma Ray Tracking Array (AGATA) demonstrator coupled with the PRISMA spectrometer detects gamma rays coincident with the Se-80 recoils, the binary partner of Pt-200. The binary partner method is applied to extract the gamma-ray transitions and build the level scheme of Pt-200. The level at 1884 keV reported by Yates et al. [S. W. Yates, E. M. Baum, E. A. Henry, L. G. Mann, N. Roy, A. Aprahamian, R. A. Meyer, and R. Estep, Phys. Rev. C 37, 1889 (1988)] was confirmed to be at 1882.1 keV and assigned as the (6(1)(+)) state. An additional gamma ray was found and it presumably deexcites the (8(1)(+)) state. The results are compared with state-of-the-art beyond mean-field calculations, performed for the even-even Pt190-204 isotopes, revealing that Pt-200 marks the transition from the gamma-unstable behavior of lighter Pt nuclei towards a more spherical one when approaching the N = 126 shell closure.

Published
2017

31. In-beam $\gamma$-ray spectroscopy of the neutron-rich platinum isotope $^{200}$Pt toward the $N=126$ shell gap

Author

John, P.R., Valiente-Dobón, J.J., Mengoni, D., Modamio, V., Lunardi, S., Bazzacco, D., Gadea, A., Wheldon, C., Rodríguez, T.R., Alexander, T., De Angelis, G., Ashwood, N., Barr, M., Benzoni, G., Birkenbach, B., Bizzeti, P.G., Bizzeti-Sona, A.M., Bottoni, S., Bowry, M., Bracco, A., Browne, F., Bunce, M., Camera, F., Corradi, L., Crespi, F.C.L., Melon, B., Farnea, E., Fioretto, E., Gottardo, A., Grente, L., Hess, H., Kokalova, Tz., Korten, W., Kuşoğlu, A., Lenzi, S., Leoni, S., Ljungvall, J., Menegazzo, R., Michelagnoli, C., Mijatović, T., Montagnoli, G., Montanari, D., Napoli, D.R., Podolyák, Zs., Pollarolo, G., Recchia, F., Reiter, P., Roberts, O.J., Şahin, E., Salsac, M.D., Scarlassara, F., Sferrazza, M., Söderström, P.A., Stefanini, A.M., Szilner, S., Ur, C.A., Vogt, A., Walshe, J., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), and 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)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nuclear structure, electromagnetic transitions, nuclear reactions
Abstract

International audience; The neutron-rich nucleus Pt200 is investigated via in-beam γ-ray spectroscopy to study the shape evolution in the neutron-rich platinum isotopes towards the N=126 shell closure. The two-neutron transfer reaction Pt198(Se82, Se80)Pt200 is used to populate excited states of Pt200. The Advanced Gamma Ray Tracking Array (AGATA) demonstrator coupled with the PRISMA spectrometer detects γ rays coincident with the Se80 recoils, the binary partner of Pt200. The binary partner method is applied to extract the γ-ray transitions and build the level scheme of Pt200. The level at 1884 keV reported by Yates et al. [S. W. Yates, E. M. Baum, E. A. Henry, L. G. Mann, N. Roy, A. Aprahamian, R. A. Meyer, and R. Estep, Phys. Rev. C 37, 1889 (1988)] was confirmed to be at 1882.1 keV and assigned as the (61+) state. An additional γ ray was found and it presumably deexcites the (81+) state. The results are compared with state-of-the-art beyond mean-field calculations, performed for the even-even 190−204Pt isotopes, revealing that Pt200 marks the transition from the γ-unstable behavior of lighter Pt nuclei towards a more spherical one when approaching the N=126 shell closure.

Published
2017
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32. EXILL—a high-efficiency, high-resolution setup for γ-spectroscopy at an intense cold neutron beam facility

Author

Jentschel, M., primary, Blanc, A., additional, de France, G., additional, Köster, U., additional, Leoni, S., additional, Mutti, P., additional, Simpson, G., additional, Soldner, T., additional, Ur, C., additional, Urban, W., additional, Ahmed, S., additional, Astier, A., additional, Augey, L., additional, Back, T., additional, Ba̧czyk, P., additional, Bajoga, A., additional, Balabanski, D., additional, Belgya, T., additional, Benzoni, G., additional, Bernards, C., additional, Biswas, D.C., additional, Bocchi, G., additional, Bottoni, S., additional, Britton, R., additional, Bruyneel, B., additional, Burnett, J., additional, Cakirli, R.B., additional, Carroll, R., additional, Catford, W., additional, Cederwall, B., additional, Celikovic, I., additional, Cieplicka-Oryńczak, N., additional, Clement, E., additional, Cooper, N., additional, Crespi, F., additional, Csatlos, M., additional, Curien, D., additional, Czerwiński, M., additional, Danu, L.S., additional, Davies, A., additional, Didierjean, F., additional, Drouet, F., additional, Duchêne, G., additional, Ducoin, C., additional, Eberhardt, K., additional, Erturk, S., additional, Fraile, L.M., additional, Gottardo, A., additional, Grente, L., additional, Grocutt, L., additional, Guerrero, C., additional, Guinet, D., additional, Hartig, A.-L., additional, Henrich, C., additional, Ignatov, A., additional, Ilieva, S., additional, Ivanova, D., additional, John, B.V., additional, John, R., additional, Jolie, J., additional, Kisyov, S., additional, Krticka, M., additional, Konstantinopoulos, T., additional, Korgul, A., additional, Krasznahorkay, A., additional, Kröll, T., additional, Kurpeta, J., additional, Kuti, I., additional, Lalkovski, S., additional, Larijani, C., additional, Leguillon, R., additional, Lica, R., additional, Litaize, O., additional, Lozeva, R., additional, Magron, C., additional, Mancuso, C., additional, Martinez, E. Ruiz, additional, Massarczyk, R., additional, Mazzocchi, C., additional, Melon, B., additional, Mengoni, D., additional, Michelagnoli, C., additional, Million, B., additional, Mokry, C., additional, Mukhopadhyay, S., additional, Mulholland, K., additional, Nannini, A., additional, Napoli, D.R., additional, Olaizola, B., additional, Orlandi, R., additional, Patel, Z., additional, Paziy, V., additional, Petrache, C., additional, Pfeiffer, M., additional, Pietralla, N., additional, Podolyak, Z., additional, Ramdhane, M., additional, Redon, N., additional, Regan, P., additional, Regis, J.M., additional, Regnier, D., additional, Oliver, R. J., additional, Rudigier, M., additional, Runke, J., additional, Rza̧ca-Urban, T., additional, Saed-Samii, N., additional, Salsac, M.D., additional, Scheck, M., additional, Schwengner, R., additional, Sengele, L., additional, Singh, P., additional, Smith, J., additional, Stezowski, O., additional, Szpak, B., additional, Thomas, T., additional, Thürauf, M., additional, Timar, J., additional, Tom, A., additional, Tomandl, I., additional, Tornyi, T., additional, Townsley, C., additional, Tuerler, A., additional, Valenta, S., additional, Vancraeyenest, A., additional, Vandone, V., additional, Vanhoy, J., additional, Vedia, V., additional, Warr, N., additional, Werner, V., additional, Wilmsen, D., additional, Wilson, E., additional, Zerrouki, T., additional, and Zielinska, M., additional

Published
2017
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33. In-beam γ -ray spectroscopy of the neutron-rich platinum isotope Pt200 toward the N=126 shell gap

Author

John, P. R., primary, Valiente-Dobón, J. J., additional, Mengoni, D., additional, Modamio, V., additional, Lunardi, S., additional, Bazzacco, D., additional, Gadea, A., additional, Wheldon, C., additional, Rodríguez, T. R., additional, Alexander, T., additional, de Angelis, G., additional, Ashwood, N., additional, Barr, M., additional, Benzoni, G., additional, Birkenbach, B., additional, Bizzeti, P. G., additional, Bizzeti-Sona, A. M., additional, Bottoni, S., additional, Bowry, M., additional, Bracco, A., additional, Browne, F., additional, Bunce, M., additional, Camera, F., additional, Corradi, L., additional, Crespi, F. C. L., additional, Melon, B., additional, Farnea, E., additional, Fioretto, E., additional, Gottardo, A., additional, Grente, L., additional, Hess, H., additional, Kokalova, Tz., additional, Korten, W., additional, Kuşoğlu, A., additional, Lenzi, S., additional, Leoni, S., additional, Ljungvall, J., additional, Menegazzo, R., additional, Michelagnoli, C., additional, Mijatović, T., additional, Montagnoli, G., additional, Montanari, D., additional, Napoli, D. R., additional, Podolyák, Zs., additional, Pollarolo, G., additional, Recchia, F., additional, Reiter, P., additional, Roberts, O. J., additional, Şahin, E., additional, Salsac, M.-D., additional, Scarlassara, F., additional, Sferrazza, M., additional, Söderström, P.-A., additional, Stefanini, A. M., additional, Szilner, S., additional, Ur, C. A., additional, Vogt, A., additional, and Walshe, J., additional

Published
2017
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34. Accurate isotopic fission yields of electromagnetically induced fission of U238 measured in inverse kinematics at relativistic energies

Author

Pellereau, E., primary, Taïeb, J., additional, Chatillon, A., additional, Alvarez-Pol, H., additional, Audouin, L., additional, Ayyad, Y., additional, Bélier, G., additional, Benlliure, J., additional, Boutoux, G., additional, Caamaño, M., additional, Casarejos, E., additional, Cortina-Gil, D., additional, Ebran, A., additional, Farget, F., additional, Fernández-Domínguez, B., additional, Gorbinet, T., additional, Grente, L., additional, Heinz, A., additional, Johansson, H., additional, Jurado, B., additional, Kelić-Heil, A., additional, Kurz, N., additional, Laurent, B., additional, Martin, J.-F., additional, Nociforo, C., additional, Paradela, C., additional, Pietri, S., additional, Rodríguez-Sánchez, J. L., additional, Schmidt, K.-H., additional, Simon, H., additional, Tassan-Got, L., additional, Vargas, J., additional, Voss, B., additional, and Weick, H., additional

Published
2017
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35. Evolution of nuclear shapes in odd-mass yttrium and niobium isotopes from lifetime measurements following fission reactions

Author

Hagen, T. W., primary, Görgen, A., additional, Korten, W., additional, Grente, L., additional, Salsac, M.-D., additional, Farget, F., additional, Ragnarsson, I., additional, Braunroth, T., additional, Bruyneel, B., additional, Celikovic, I., additional, Clément, E., additional, de France, G., additional, Delaune, O., additional, Dewald, A., additional, Dijon, A., additional, Hackstein, M., additional, Jacquot, B., additional, Litzinger, J., additional, Ljungvall, J., additional, Louchart, C., additional, Michelagnoli, C., additional, Napoli, D. R., additional, Recchia, F., additional, Rother, W., additional, Sahin, E., additional, Siem, S., additional, Sulignano, B., additional, Theisen, Ch., additional, and Valiente-Dobon, J. J., additional

Published
2017
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36. High-precision measurement of isotopic fission yields of 236U*.

Author

Köster, U., Audouin, L., Taieb, J., Chatillon, A., Grente, L., Boutoux, G., Gorbinet, T., Martin, J.-F., Alvarez-Pol, H., Ayyad, Y., Bélier, G., Benlliure, J., Caamaño, M., Casarejos, E., Cortina-Gil, D., Farget, F., Fernández-Domínguez, B., Heinz, A., Johansson, H., and Jurado, B.

Subjects
NUCLEAR fission, RADIOACTIVE nuclear beams, RELATIVISTIC particles, KINEMATICS, DATA libraries
Abstract

We report on the second SOFIA experiment, dedicated to the fission yields of 236U*, analog to 235U(n,f). The measurement is based on the inverse kinematics method, using a relativistic, secondary beam of 236U. Both fission fragments are identified in mass and charge in the SOFIA recoil spectrometer. The obtained isotopic yields are compared with existing spectroscopy measurements and the elemental yields are used to discuss the treatment of the even-odd effect with energy in nuclear data libraries. [ABSTRACT FROM AUTHOR]

Published
2018

37. Lifetime measurements on fission fragments in the A similar to 100 region

Author

Grente, L., Salsac, M. D., Wolfram KORTEN, Goergen, A., Hagen, T. W., Braunroth, T., Bruyneel, B., Celikovic, I., Clement, E., Delaune, O., Dijon, A., Drouart, A., Ertuerk, S., Farget, F., France, G., Gottardo, A., Hackstein, M., Jacquot, B., Libert, J., Litzinger, J., Ljungvall, J., Louchart, C., Michelagnoli, C., Napoli, D. R., Navin, A., Pillet, N., Pipidis, A., Recchia, F., Rejmund, M., Rother, W., Sahin, E., Schmitt, C., Siem, S., Sulignano, B., Valiente-Dobon, J. J., Zell, K. O., Chatillon, A, Farget, F, Faust, H, Fioni, G, Goutte, D, Goutte, H, Napoli, Daniel Ricardo -- 0000-0002-8154-6958, KORTEN, Wolfram -- 0000-0002-3940-0816, Delaune, Olivier -- 0000-0002-1087-2342, Celikovic, Igor -- 0000-0002-5642-4393, Gorgen, Andreas -- 0000-0003-1916-9941, Recchia, Francesco -- 0000-0002-8428-0112, de France, Gilles -- 0000-0002-7439-1759, Clement, Emmanuel -- 0000-0003-1887-717X, Sahin, Eda -- 0000-0003-0683-5140, GOTTARDO, Andrea -- 0000-0002-0390-5767, and [Grente, L. -- Salsac, M. -D. -- Korten, W. -- Bruyneel, B. -- Drouart, A. -- Louchart, C. -- Sulignano, B.] CEA Saclay, IRFU Serv Phys Nucl, F-91191 Gif Sur Yvette, France -- [Goergen, A. -- Hagen, T. W. -- Siem, S.] Univ Oslo, Dept Phys, N-0316 Oslo, Norway -- [Braunroth, T. -- Hackstein, M. -- Litzinger, J. -- Rother, W. -- Zell, K. O.] Univ Cologne, Inst Kernphys, D-50937 Cologne, Germany -- [Celikovic, I. -- Clement, E. -- Delaune, O. -- Dijon, A. -- Farget, F. -- de France, G. -- Jacquot, B. -- Navin, A. -- Rejmund, M. -- Schmitt, C.] GANIL, CEA DSM, CNRS IN2P3, F-14706 Caen, France -- [Celikovic, I.] Univ Belgrade, Inst Nucl Sci VINCA, YU-11000 Belgrade, Serbia -- [Ertuerk, S.] Nigde Univ, Fac Sci, Nigde, Turkey -- [Gottardo, A. -- Michelagnoli, C. -- Napoli, D. R. -- Pipidis, A. -- Recchia, F. -- Sahin, E. -- Valiente-Dobon, J. J.] Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy -- [Libert, J. -- Pillet, N.] CEA, DAM, DIF, F-91297 Arpajon, France -- [Ljungvall, J.] Univ Paris 11, F-91405 Orsay, France -- [Ljungvall, J.] CNRS, CSNSM, IN2P3, F-91405 Orsay, France

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

5th International Workshop on Nuclear Fission and Fission Product Spectroscopy (FISSION) -- MAY 28-31, 2013 -- Caen, FRANCE, WOS: 000342384500002, Lifetimes of first 4(+) and 6(+) states have been measured in neutron-rich isotopes of Zr, Mo, Ru and Pd using the recoil distance Doppler shift method at GANIL. The nuclei were produced through a fusion-fission reaction in inverse kinematics. The fission fragments were fully identified in the large-acceptance VAMOS spectrometer and gamma -rays were detected in coincidence with the EXOGAM germanium array. Lifetimes of excited states in the range of 1-100 ps were measured with the Cologne plunger. Preliminary lifetime results are presented as well as a discussion on the evolution of the collectivity in this region., ILL, CEA DSM & DAM, CNRS IN2P3, ENSICAEN, GANIL, Scientific and Technological Council of Turkey [210T043], S. Erturk acknowledges the Scientific and Technological Council of Turkey for their support with project number 210T043.

Published
2013

38. In-beam gamma-ray spectroscopy of the neutron-rich platinum isotope Pt 200 toward the N=126 shell gap

Author

John, Philipp Rudolf, Valiente-Dobon, J.J., Mengoni, D, Lunardi, S., Bazzacco, D., Gadea, A, Wheldon, C, Rodriguez, T.R., Alexander, T, De Angelis, G., Ashwood, N., Barr, M, Benzoni, Giovanna, Birkenbach, B, Bizzetti, PG, Bizzetti-Sona, AM, Bottoni, S., Bowry, M, Bracco, Angela, Browne, F, Bunce, M, Camera, F., Corradi, Lorenzo, Crespi, Fabio Celso Luigi, Melon, Barbara, Farnea, E., Fioretto, E., Gottardo, A, Grente, L, Hess, H, Kokalova, Tz, Korten, W., Kusoglu, A, Lenzi, S.M., Leoni, S., Ljungvall, J, Menegazzo, R., Michelagnoli, C, Mijatovic, T., Montagnoli, G., Montanari, D, Napoli, D R, Podolyak, Zs., Pollarolo, G, Recchia, F, Reiter, P., Roberts, Oliver O.J., Sahin, Esin, Salsac, M-.D, Scarlassara, Fernando, Sferrazza, Michele, Soderstrom, P.-A., Stefanini, A.M., Szilner, Suzana, Ur, C.A., Vogt, A, Walshe, J., John, Philipp Rudolf, Valiente-Dobon, J.J., Mengoni, D, Lunardi, S., Bazzacco, D., Gadea, A, Wheldon, C, Rodriguez, T.R., Alexander, T, De Angelis, G., Ashwood, N., Barr, M, Benzoni, Giovanna, Birkenbach, B, Bizzetti, PG, Bizzetti-Sona, AM, Bottoni, S., Bowry, M, Bracco, Angela, Browne, F, Bunce, M, Camera, F., Corradi, Lorenzo, Crespi, Fabio Celso Luigi, Melon, Barbara, Farnea, E., Fioretto, E., Gottardo, A, Grente, L, Hess, H, Kokalova, Tz, Korten, W., Kusoglu, A, Lenzi, S.M., Leoni, S., Ljungvall, J, Menegazzo, R., Michelagnoli, C, Mijatovic, T., Montagnoli, G., Montanari, D, Napoli, D R, Podolyak, Zs., Pollarolo, G, Recchia, F, Reiter, P., Roberts, Oliver O.J., Sahin, Esin, Salsac, M-.D, Scarlassara, Fernando, Sferrazza, Michele, Soderstrom, P.-A., Stefanini, A.M., Szilner, Suzana, Ur, C.A., Vogt, A, and Walshe, J.

Abstract

The neutron-rich nucleus Pt200 is investigated via in-beam γ-ray spectroscopy to study the shape evolution in the neutron-rich platinum isotopes towards the N=126 shell closure. The two-neutron transfer reaction Pt198(Se82, Se80)Pt200 is used to populate excited states of Pt200. The Advanced Gamma Ray Tracking Array (AGATA) demonstrator coupled with the PRISMA spectrometer detects γ rays coincident with the Se80 recoils, the binary partner of Pt200. The binary partner method is applied to extract the γ-ray transitions and build the level scheme of Pt200. The level at 1884 keV reported by Yates et al. [S. W. Yates, E. M. Baum, E. A. Henry, L. G. Mann, N. Roy, A. Aprahamian, R. A. Meyer, and R. Estep, Phys. Rev. C 37, 1889 (1988)] was confirmed to be at 1882.1 keV and assigned as the (61+) state. An additional γ ray was found and it presumably deexcites the (81+) state. The results are compared with state-of-the-art beyond mean-field calculations, performed for the even-even 190-204Pt isotopes, revealing that Pt200 marks the transition from the γ-unstable behavior of lighter Pt nuclei towards a more spherical one when approaching the N=126 shell closure., 0, SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2017

39. EXILL - a high-efficiency, high-resolution setup for gamma-spectroscopy at an intense cold neutron beam facility

Author

Jentschel, M., Blanc, A., de France, G., Koster, U., Leoni, S., Mutti, P., Simpson, G., Soldner, T., Ur, C., Urban, W., Ahmed, S., Astier, A., Augey, L., Back, T., Baczyk, P., Bajoga, A., Balabanski, D., Belgya, T., Benzoni, G., Bernards, C., Biswas, D. C., Bocchi, G., Bottoni, S., Britton, R., Bruyneel, B., Burnett, J., Cakirli, R. B., Carroll, R., Catford, W., Cederwall, Bo, Celikovic, I., Cieplicka-Oryn'czak, N., Clement, E., Cooper, N., Crespi, F., Csatlos, M., Curien, D., Czerwinski, M., Danu, L. S., Davies, A., Didierjean, F., Drouet, F., Duche'ne, G., Ducoin, C., Eberhardt, K., Erturk, S., Fraile, L. M., Gottardo, A., Grente, L., Grocutt, L., Guerrero, C., Guinet, D., Hartig, A. -L, Henrich, C., Ignatov, A., Ilieva, S., Ivanova, D., John, B. V., John, R., Jolie, J., Kisyov, S., Krticka, M., Konstantinopoulos, T., Korgul, A., Krasznahorkay, A., Kroell, T., Kurpeta, J., Kuti, I., Lalkovski, S., Larijani, C., Leguillon, R., Lica, R., Litaize, O., Lozeva, R., Magron, C., Mancuso, C., Martinez, E. Ruiz, Massarczyk, R., Mazzocchi, C., Melon, B., Mengoni, D., Michelagnoli, C., Million, B., Mokry, C., Mukhopadhyay, S., Mulholland, K., Nannini, A., Napoli, D. R., Olaizola, B., Orlandi, R., Patel, Z., Paziy, V., Petrache, C., Pfeiffer, M., Pietralla, N., Podolyak, Z., Ramdhane, M., Redon, N., Regan, P., Regis, J. M., Regnier, D., Oliver, R. J., Rudigier, M., Runke, J., Rzaca-Urban, T., Saed-Samii, N., Salsac, M. D., Scheck, M., Schwengner, R., Sengele, L., Singh, P., Smith, J., Stezowski, O., Szpak, B., Thomas, T., Thuerauf, M., Timar, J., Tom, A., Tomandl, I., Tornyi, T., Townsley, C., Tuerler, A., Valenta, S., Vancraeyenest, A., Vandone, V., Vanhoy, J., Vedia, V., Warr, N., Werner, V., Wilmsen, D., Wilson, E., Zerrouki, T., Zielinska, M., Jentschel, M., Blanc, A., de France, G., Koster, U., Leoni, S., Mutti, P., Simpson, G., Soldner, T., Ur, C., Urban, W., Ahmed, S., Astier, A., Augey, L., Back, T., Baczyk, P., Bajoga, A., Balabanski, D., Belgya, T., Benzoni, G., Bernards, C., Biswas, D. C., Bocchi, G., Bottoni, S., Britton, R., Bruyneel, B., Burnett, J., Cakirli, R. B., Carroll, R., Catford, W., Cederwall, Bo, Celikovic, I., Cieplicka-Oryn'czak, N., Clement, E., Cooper, N., Crespi, F., Csatlos, M., Curien, D., Czerwinski, M., Danu, L. S., Davies, A., Didierjean, F., Drouet, F., Duche'ne, G., Ducoin, C., Eberhardt, K., Erturk, S., Fraile, L. M., Gottardo, A., Grente, L., Grocutt, L., Guerrero, C., Guinet, D., Hartig, A. -L, Henrich, C., Ignatov, A., Ilieva, S., Ivanova, D., John, B. V., John, R., Jolie, J., Kisyov, S., Krticka, M., Konstantinopoulos, T., Korgul, A., Krasznahorkay, A., Kroell, T., Kurpeta, J., Kuti, I., Lalkovski, S., Larijani, C., Leguillon, R., Lica, R., Litaize, O., Lozeva, R., Magron, C., Mancuso, C., Martinez, E. Ruiz, Massarczyk, R., Mazzocchi, C., Melon, B., Mengoni, D., Michelagnoli, C., Million, B., Mokry, C., Mukhopadhyay, S., Mulholland, K., Nannini, A., Napoli, D. R., Olaizola, B., Orlandi, R., Patel, Z., Paziy, V., Petrache, C., Pfeiffer, M., Pietralla, N., Podolyak, Z., Ramdhane, M., Redon, N., Regan, P., Regis, J. M., Regnier, D., Oliver, R. J., Rudigier, M., Runke, J., Rzaca-Urban, T., Saed-Samii, N., Salsac, M. D., Scheck, M., Schwengner, R., Sengele, L., Singh, P., Smith, J., Stezowski, O., Szpak, B., Thomas, T., Thuerauf, M., Timar, J., Tom, A., Tomandl, I., Tornyi, T., Townsley, C., Tuerler, A., Valenta, S., Vancraeyenest, A., Vandone, V., Vanhoy, J., Vedia, V., Warr, N., Werner, V., Wilmsen, D., Wilson, E., Zerrouki, T., and Zielinska, M.

Abstract

In the EXILL campaign a highly efficient array of high purity germanium (HPGe) detectors was operated at the cold neutron beam facility PF1B of the Institut Laue-Langevin (ILL) to carry out nuclear structure studies, via measurements of gamma-rays following neutron-induced capture and fission reactions. The setup consisted of a collimation system producing a pencil beam with a thermal capture equivalent flux of about 10(8) ns(-1)cm(2) at the target position and negligible neutron halo. The targetwas surrounded by an array of eight to ten anti-Compton shielded EXOGAMClover detectors, four to six anti-Compton shielded large coaxial GASP detectors and two standard Clover detectors. For a part of the campaign the array was combined with 16 LaBr3:(Ce) detectors from the FATIMA collaboration. The detectorswere arranged in an array of rhombicuboctahedron geometry, providing the possibility to carry out very precise angular correlation and directional-polarization correlation measurements. The triggerless acquisition system allowed a signal collection rate of up to 6 x 10(5) Hz. The data allowed to set multi-fold coincidences to obtain decay schemes and in combination with the FATIMA array of LaBr3:(Ce) detectors to analyze half-lives of excited levels in the pico-to microsecond range. Precise energy and efficiency calibrations of EXILL were performed using standard calibration sources of Ba-133, Co-60 and Eu-152 as well as data from the reactions Al-27(n, gamma)Al-28 and Cl-35(n,gamma)Cl-36 in the energy range from 30 keV up to 10MeV., QC 20171121

Published
2017
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40. Evolution of nuclear shapes in odd-mass yttrium and niobium isotopes from lifetime measurements following fission reactions

Author

Hagen, T. W., Goergen, A., Korten, W., Grente, L., Salsac, M. -D., Farget, F., Ragnarsson, I., Braunroth, T., Bruyneel, B., Celikovic, I., Clement, E., de France, G., Delaune, O., Dewald, A., Dijon, A., Hackstein, M., Jacquot, B., Litzinger, J., Ljungvall, J., Louchart, C., Michelagnoli, C., Napoli, D. R., Recchia, F., Rother, W., Sahin, E., Siem, S., Sulignano, B., Theisen, Ch., Valiente-Dobon, J. J., Hagen, T. W., Goergen, A., Korten, W., Grente, L., Salsac, M. -D., Farget, F., Ragnarsson, I., Braunroth, T., Bruyneel, B., Celikovic, I., Clement, E., de France, G., Delaune, O., Dewald, A., Dijon, A., Hackstein, M., Jacquot, B., Litzinger, J., Ljungvall, J., Louchart, C., Michelagnoli, C., Napoli, D. R., Recchia, F., Rother, W., Sahin, E., Siem, S., Sulignano, B., Theisen, Ch., and Valiente-Dobon, J. J.

Abstract

Lifetimes of excited states in Y-99, Y-101, Nb-101, Nb-103, and Nb-105 were measured in an experiment using the recoil distance Doppler shift method at GANIL (Grand Accelerateur National d'Ions Lourds). The neutron-rich nuclei were produced in fission reactions between a U-238 beam and a Be-9 target. Prompt gamma rays were measured with the EXOGAM array and correlated with fission fragments that were identified in mass and atomic number with the VAMOS++ spectrometer. The measured lifetimes, together with branching ratios, provide B(M1) and B(E2) values for the strongly coupled rotational bands built on the [422] 5/2(+) ground state in the Y and Nb nuclei with neutron number N >= 60. The comparison of the experimental results with triaxial particle-rotor calculations provides information about the evolution of the nuclear shape in this mass region.

Published
2017

41. LIFETIME MEASURMENTS OF EXCITED STATES IN NEUTRON-RICH FISSION FRAGMENTS

Author

Hagen, T. W., Grente, L., Gorgen, A., Salsac, M-D., Korten, W., Farget, F., Braunroth, T., Bruyneel, B., Celikovic, I., Clement, E., de France, G., Delaune, O., Dewald, A., Dijon, A., Hackstein, M., Jacquot, B., Litzinger, J., Ljungvall, J., Louchart, C., Michelagnoli, C., Napoli, D. R., Navin, A., Recchia, F., Rejmund, M., Rother, W., Sahin, E., Siem, S., Sulignano, B., Theisen, Ch., Valiente-Dobon, J. J., Hagen, T. W., Grente, L., Gorgen, A., Salsac, M-D., Korten, W., Farget, F., Braunroth, T., Bruyneel, B., Celikovic, I., Clement, E., de France, G., Delaune, O., Dewald, A., Dijon, A., Hackstein, M., Jacquot, B., Litzinger, J., Ljungvall, J., Louchart, C., Michelagnoli, C., Napoli, D. R., Navin, A., Recchia, F., Rejmund, M., Rother, W., Sahin, E., Siem, S., Sulignano, B., Theisen, Ch., and Valiente-Dobon, J. J.

Abstract

Lifetimes of short-lived excited states in a wide range of neutron-rich fission fragments were measured using the recoil distance Doppler shift (RDDS) technique, which was applied to fusion-fission reactions in inverse kinematics for the first time. The fission fragments were identified event-by-event in mass, charge, and atomic number using the VAMOS magnetic spectrometer at GANIL. Gamma rays originating from the fission fragments were measured with the EXOGAM array of Ge Clover detectors around the target position. Using a degrader, the change in the Doppler shift of the gamma ray allows the application of the RDDS method. Details of the experimental technique will be discussed and the status for the ongoing analysis for odd-mass yttrium isotopes will be presented.

Published
2016

42. Shape evolution in the neutron-rich osmium isotopes: Prompt gamma-ray spectroscopy of Os196

Author

John, P. R., Modamio, V., Valiente-Dobon, J. J., Mengoni, D., Lunardi, S., Rodriguez, T. R., Bazzacco, D., Gadea, A., Wheldon, C., Alexander, T., Angelis, G., Ashwood, N., Barr, M., Benzoni, G., Birkenbach, B., Bizzeti, P. G., Bizzeti-Sona, A. M., Bottoni, S., Bowry, M., Bracco, A., Browne, F., Bunce, M., Camera, F., Cederwall, B., Corradi, L., Crespi, F. C. L., Desesquelles, P., Eberth, J., Farnea, E., Fioretto, E., Goergen, A., Gottardo, A., Grebosz, J., Grente, L., Hess, H., Jungclaus, A., Kokalova, Tz, Korichi, A., Wolfram KORTEN, Kusoglu, A., Lenzi, S., Leoni, S., Ljungvall, J., Maron, G., Meczynski, W., Melon, B., Menegazzo, R., Michelagnoli, C., Mijatovic, T., Million, B., Molini, P., Montagnoli, G., Montanari, D., Napoli, D. R., Nolan, P., Oziol, Ch, Podolyak, Zs, Pollarolo, G., Pullia, A., Quintana, B., Recchia, F., Reiter, P., Roberts, O. J., Rosso, D., Sahin, E., Salsac, M. D., Scarlassara, F., Sferrazza, M., Simpson, J., Soderstrom, P. A., Stefanini, A. M., Stezowski, O., Szilner, S., Theisen, Ch, Ur, C. A., and Walshe, J.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

The shape transition in the neutron-rich Os isotopes is studied by investigating the neutron-rich 196Os nucleus through in-beam γ-ray spectroscopy using a two-proton transfer reaction from a 198Pt target to a 82Se beam. The beam-like recoils were detected and identified with the large-acceptance magnetic spectrometer PRISMA, and the coincident γ rays were measured with the advanced gamma tracking array (AGATA) demonstrator. The de-excitation of the low-lying levels of the yrast-band of 196Os were identified for the first time. The results are compared with state-of-the-art beyond-mean-field calculations, performed for the even-even 188-198Os isotopes. The new results suggest a smooth transition in the Os isotopes from a more axial rotational behavior towards predominately vibrational nuclei through triaxial configurations. An almost perfect γ-unstable/triaxial rotor yrast band is predicted for 196Os which is in agreement with the experimentally measured excited states

Published
2014

43. Shape evolution in the neutron-rich osmium isotopes: Prompt γ-ray spectroscopy of Os196

Author

R. John, P., Modamio, V., Valiente-Dobón, J.J., Mengoni, D., Lunardi, S., R. Rodríguez, T., Bazzacco, D., Gadea, A., Wheldon, C., Alexander, T., De Angelis, G., Ashwood, N., Barr, M., Benzoni, G., Birkenbach, B., G. Bizzeti, P., M. Bizzeti-Sona, A., Bottoni, S., Bowry, M., Bracco, A., Browne, F., Bunce, M., Camera, F., Cederwall, B., Corradi, L., C. L. Crespi, F., Désesquelles, P., Eberth, J., Farnea, E., Fioretto, E., Görgen, A., Gottardo, A., Grebosz, J., Grente, L., Hess, H., Jungclaus, A., Kokalova, Tz., Korichi, A., Korten, W., Kuşoğlu, A., Lenzi, S., Leoni, S., Ljungvall, J., Maron, G., Meczynski, W., Melon, B., Menegazzo, R., Michelagnoli, C., Mijatović, T., Million, B., Molini, P., Montagnoli, G., Montanari, D., R. Napoli, D., Nolan, P., Oziol, Ch., Podolyák, Zs., Pollarolo, G., Pullia, A., Quintana, B., Recchia, F., Reiter, P., J. Roberts, O., Rosso, D., Şahin, E., Salsac, M.-D., Scarlassara, F., Sferrazza, M., Simpson, J., Söderström, P.-A., M. Stefanini, A., Stezowski, O., Szilner, S., Theisen, Ch., Ur, C.A., Walshe, J., CSNSM SNO, 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)-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 Sciences Nucléaires et de Sciences de la Matière (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), Institut de Physique Nucléaire d'Orsay (IPNO), Institut de Physique Nucléaire de Lyon (IPNL), 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
Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

The shape transition in the neutron-rich Os isotopes is studied by investigating the neutron-rich 196Os nucleus through in-beam γ-ray spectroscopy using a two-proton transfer reaction from a 198Pt target to a 82Se beam. The beam-like recoils were detected and identified with the large-acceptance magnetic spectrometer PRISMA, and the coincident γ rays were measured with the advanced gamma tracking array (AGATA) demonstrator. The de-excitation of the low-lying levels of the yrast-band of 196Os were identified for the first time. The results are compared with state-of-the-art beyond-mean-field calculations, performed for the even-even 188−198Os isotopes. The new results suggest a smooth transition in the Os isotopes from a more axial rotational behavior towards predominately vibrational nuclei through triaxial configurations. An almost perfect γ-unstable/triaxial rotor yrast band is predicted for 196Os which is in agreement with the experimentally measured excited states.

Published
2014
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44. Shape evolution in the neutron-rich Osmium isotopes: prompt gamma-ray spectroscopy of 196Os

Author

John, P.R., Modamio, V., Valiente-Dobon, J.J., Mengoni, D., Lunardi, S., Rodriguez, T.R., Bazzacco, D., Gadea, A., Wheldon, C., Alexander, T., de Angelis, G., Ashwood, N., Barr, M., Benzoni, G., Birkenbach, B., Bizzeti, P.G., Bizzeti-Sona, A.M., Bottoni, S., Bowry, M., Bracco, A., Browne, F., Bunce, M., Camera, F., Cederwall, B., Corradi, L., Crespi, F.C.L., Desesquelles, P., Eberth, J., Farnea, E., Fioretto, E., Gorgen, A., Gottardo, A., Grebosz, J., Grente, L., Hess, H., Jungclaus, A., Kokalova, Tz., Korichi, A., Korten, W., Kusoglu, A., Lenzi, S., Leoni, S., Ljungvall, J., Maron, G., Meczynski, W., Menegazzo, R., Michelagnoli, C., Mijatovic, Tea, Million, B., Molini, P., Montagnoli, G., Montanari, D., Napoli, D.R., Nolan, P., Oziol, Ch., Podolyak, Zs., Pollarolo, G., Pullia, A., Quintana, B., Recchia, F., Reiter, P., Roberts, O.J., Rosso, D., Sahin, E., Salsac, M.-D., Scarlassara, F., Sferrazza, M., Simpson, J., Soderstrom, P.-A., Stefanini, A.M., Stezowski, O., Szilner, Suzana, Theisen, Ch., Ur, C.A., and Walshe, J.

Subjects
Nuclear Theory, shape transition, neutron rich nuclei, gamma-ray spectroscopy, Nuclear Experiment
Abstract

The shape transition in the neutron-rich Os isotopes is studied by investigating the neutron rich 196Os nucleus through in-beam gamma-ray spectroscopy using a two-proton transfer reaction from a 198Pt target to a 82Se beam. The beam-like recoils were detected and identified with the large-acceptance magnetic spectrometer PRISMA and the coincident gamma rays were measured with the AGATA demonstrator. The de-excitation of the low-lying levels of the yrast-band of 196Os were identified for the first time. The results are compared with state-of-the-art beyond mean-field calculations, performed for the even-even 188, 198Os isotopes. The new results suggest a smooth transition in the Os isotopes from a more axial rotational behaviour towards predominately vibrational nuclei through triaxial configurations. An almost perfect gamma-unstable/triaxial rotor yrast-band is predicted for 196Os which is in agreement with the experimentally measured excited states.

Published
2014
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45. Shape evolution in the neutron-rich osmium isotopes: Prompt γ-ray spectroscopy of Os 196

Author

John, P. R., Modamio, V., Valiente Dobón, J. J., Mengoni, D., Lunardi, S., Rodríguez, T. R., Bazzacco, D., Gadea, A., Wheldon, C., Alexander, T., de Angelis, G., Ashwood, N., Barr, M., Benzoni, G., Birkenbach, B., Bizzeti, P. G., Bizzeti Sona, A. M., Bottoni, S., Bowry, M., Bracco, A., Browne, F., Bunce, M., Camera, F., Cederwall, B., Corradi, L., Crespi, F. C. L., Désesquelles, P., Eberth, J., Farnea, E., Fioretto, E., Görgen, A., Gottardo, A., Grebosz, J., Grente, L., Hess, H., Jungclaus, A., Kokalova, T. z., Korichi, A., Korten, W., Kuşoğlu, A., Lenzi, S., Leoni, S., Ljungvall, J., Maron, G., Meczynski, W., Melon, B., Menegazzo, R., Michelagnoli, C., Mijatović, T., Million, B., Molini, P., Montagnoli, G., Montanari, D., Napoli, D. R., Nolan, P., Oziol, C. h., Podolyák, Z. s., Pollarolo, Giovanni, Pullia, A., Quintana, B., Recchia, F., Reiter, P., Roberts, O. J., Rosso, D., Şahin, E., Salsac, M. D., Scarlassara, F., Sferrazza, M., Simpson, J., Söderström, P. A., Stefanini, A. M., Stezowski, O., Szilner, S., Theisen, C. h., C. A., Ur, and Walshe, J.

Published
2014

46. Lifetimes of Excited States in Neutron-Rich Nuclei

Author

Görgen, A., Hagen, T.W., Grente, L., Salsac, M.-D., Farget, F., Sulignano, B., Louchart, C., Jacquot, B., Braunroth, T., Bruyneel, B., Celikovic, I., Clément, E., De France, G., Delaune, O., Dewald, A., Dijon, A., Hackstein, M., Korten, W., Litzinger, J., Ljungvall, J., Michelagnoli, C., Napoli, D.R., Recchia, F., Rother, W., Sahin, E., Siem, S., Theisen, Ch., Valiente-Dobon, J.J., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), 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
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2012

47. The SOFIA experiment: Measurement of236U fission fragment yields in inverse kinematics

Author

Grente, L., primary, Taïeb, J., additional, Chatillon, A., additional, Martin, J.-F., additional, Pellereau, É, additional, Boutoux, G., additional, Gorbinet, T., additional, Bélier, G., additional, Laurent, B., additional, Alvarez-Pol, H., additional, Ayyad, Y., additional, Benlliure, J., additional, Caamaño, M., additional, Audouin, L., additional, Casarejos, E., additional, Cortina-Gil, D., additional, Farget, F., additional, Fernández-Domínguez, B., additional, Heinz, A., additional, Jurado, B., additional, Kelić-Heil, A., additional, Kurz, N., additional, Lindberg, S., additional, Löher, B., additional, Nociforo, C., additional, Paradela, C., additional, Pietri, S., additional, Ramos, D., additional, Rodriguez-Sanchez, J.-L., additional, Rodríguez-Tajes, C., additional, Rossi, D., additional, Schmidt, K.-H., additional, Simon, H., additional, Tassan-Got, L., additional, Törnqvist, H., additional, Vargas, J., additional, Voss, B., additional, Weick, H., additional, and Yan, Y., additional

Published
2016
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48. Lifetime Measurments of Excited States in Neutron-rich Fission Fragments

Author

Hagen, T.W., primary, Grente, L., additional, Görgen, A., additional, Salsac, M.-D., additional, Korten, W., additional, Farget, F., additional, Braunroth, T., additional, Bruyneel, B., additional, Celikovic, I., additional, Clément, E., additional, de France, G., additional, Delaune, O., additional, Dewald, A., additional, Dijon, A., additional, Hackstein, M., additional, Jacquot, B., additional, Litzinger, J., additional, Ljungvall, J., additional, Louchart, C., additional, Michelagnoli, C., additional, Napoli, D.R., additional, Navin, A., additional, Recchia, F., additional, Rejmund, M., additional, Rother, W., additional, Sahin, E., additional, Siem, S., additional, Sulignano, B., additional, Theisen, Ch., additional, and Valiente-Dobon, J.J., additional

Published
2016
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49. Accurate measurements of fission-fragment yields in234,235,236,238U(γ,f) with the SOFIA set-up

Author

Chatillon, A., primary, Taïeb, J., additional, Martin, J.-F., additional, Pellereau, E., additional, Boutoux, G., additional, Gorbinet, T., additional, Grente, L., additional, Bélier, G., additional, Laurent, B., additional, Alvarez-Pol, H., additional, Ayyad, Y., additional, Benlliure, J., additional, Caamaño, M., additional, Audouin, L., additional, Casarejos, E., additional, Cortina-Gil, D., additional, Farget, F., additional, Fernández-Domínguez, B., additional, Heinz, A., additional, Jurado, B., additional, Kelić-Heil, A., additional, Kurz, N., additional, Lindberg, S., additional, Löher, B., additional, Nociforo, C., additional, Paradela, C., additional, Pietri, S., additional, Ramos, D., additional, Rodriguez-Sanchez, J.-L., additional, Rodrìguez-Tajes, C., additional, Rossi, D., additional, Schmidt, K.-H., additional, Simon, H., additional, Tassan-Got, L., additional, Törnqvist, H., additional, Vargas, J., additional, Voss, B., additional, Weick, H., additional, and Yan, Y., additional

Published
2016
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50. The SOFIA experiment Measurement of 236U fission fragment yields in inverse kinematics.

Author

Grente, L., Taïeb, J., Chatillon, A., Martin, J.-F., Pellereau, É., Boutoux, G., Gorbinet, T., Bélier, G., Laurent, B., Alvarez-Pol, H., Ayyad, Y., Benlliure, J., Caamaño, M., Audouin, L., Casarejos, E., Cortina-Gil, D., Farget, F., Fernández-Domíngue, B., Heinz, A., and Jurado, B.

Subjects
FISSION products, KINEMATICS, RELATIVISTIC energy, NUCLEOSYNTHESIS, RADIOACTIVE decay, NUCLEAR reactors
Abstract

The SOFIA (Studies On FIssion with Aladin) experiment aims at measuring fission-fragments isotopic yields with high accuracy using inverse kinematics at relativistic energies. This experimental technique allows to fully identify the fission fragments in nuclear charge and mass number, thus providing very accurate isotopic yields for lowenergy fission of a large variety of fissioning systems. This report focuses on the latest results obtained with this set-up concerning electromagnetic-induced fission of 236U. [ABSTRACT FROM AUTHOR]

Published
2016
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