Excited states in the neutron-rich 85Se nucleus have been studied using for the first time a fast neutron-induced fission of 232Th. The experiment was performed at the ALTO facility of the IPN Orsay. Coupling of the LICORNE directional neutron source with the ν-ball high-resolution γ-ray spectrometer provided unique access to high-spin states in neutron-rich fission fragments from the 232Th(n, f) reaction. A preliminary level scheme of 85Se was established by the analysis of prompt γ-γ-γ coincidences. Identification of the all known yrast states in 85Se is the first step towards studies of more neutron-rich Se isotopes.
γ-ray spectroscopy of 85Se produced in 232th fission / E. Adamska, A. Korgul, A. Fijalkowska, K. Miernik, M. Piersa, R. Canavan, D. Etasse, N. Jovancevic, M. Lebois, M. Rudigier, D. Thisse, J.N. Wilson, P. Adsley, A. Algora, M. Babo, K. Belvedere, J. Benito, A. Blazhev, G. Benzoni, A. Boso, S. Bottoni, M. Bunce, R. Chakma, N. Cieplicka-Orynczak, M. Ciemala, S. Collins, L. Cortes, P. Davies, C. Delafosse, M. Fallot, B. Fornal, L.M. Fraile, R.-. Gerst, D. Gjestvang, A. Gottardo, V. Guadilla, G. Hafner, K. Hauschild, M. Heine, C. Henrich, I. Homm, F. Ibrahim, L.W. Iskra, P. Koseoglou, T. Kroll, T. Kurtukian-Nieto, L. Le-Meur, S. Leoni, J. Ljungvall, A. Lopez-Martens, R. Lozeva, I. Matea, J. Nemer, S. Oberstedt, W. Paulsen, Y. Popovitch, L. Qi, D. Ralet, P.H. Regan, D. Reygadas Tello, K. Rezynkina, V. Sanchez-Tembleque, C. Schmitt, P.-. Soderstrom, C. Surder, G. Tocabens, V. Vedia, D. Verney, N. Warr, B. Wasilewska, J. Wiederhold, M. Yavahchova, F. Zeiser. - In: ACTA PHYSICA POLONICA B. - ISSN 0587-4254. - 51:3(2020), pp. 843-848. [10.5506/APhysPolB.51.843]
γ-ray spectroscopy of 85Se produced in 232th fission
S. Bottoni;S. Leoni;
2020
Abstract
Excited states in the neutron-rich 85Se nucleus have been studied using for the first time a fast neutron-induced fission of 232Th. The experiment was performed at the ALTO facility of the IPN Orsay. Coupling of the LICORNE directional neutron source with the ν-ball high-resolution γ-ray spectrometer provided unique access to high-spin states in neutron-rich fission fragments from the 232Th(n, f) reaction. A preliminary level scheme of 85Se was established by the analysis of prompt γ-γ-γ coincidences. Identification of the all known yrast states in 85Se is the first step towards studies of more neutron-rich Se isotopes.
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