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Evidence for octupole collectivity in Pt-172

Authors :: Ertoprak, A.
Cederwall, B.
Qi, C.
Aktas, O.
Doncel, M.
Hadinia, B.
Liotta, R.
Sandzelius, M.
Scholey, C.
Andgren, K.
Back, T.
Badran, H.
Braunroth, T.
Calverley, T.
Cox, D. M.
Cullen, D. M.
Fang, Y. D.
Ganioglu, E.
Giles, M.
Gomez Hornillos, M. B.
Grahn, T.
Greenlees, P. T.
Hilton, J.
Hodge, D.
Ideguchi, E.
Jakobsson, U.
Johnson, A.
Jones, P. M.
Julin, R.
Juutinen, S.
Ketelhut, S.
Khaplanov, A.
Kumar Raju, M.
Leino, M.
Li, H.
Liu, H.
Matta, S.
Modamio, V.
Nara Singh, B. S.
Niikura, M.
Nyman, M.
Ozgur, I.
Page, R. D.
Pakarinen, J.
Papadakis, P.
Partanen, J.
Paul, E. S.
Petrache, C. M.
Peura, P.
Rahkila, P.
Ruotsalainen, P.
Saren, J.
Sorri, J.
Stolze, S.
Subramaniam, P.
Taylor, M. J.
Uusitalo, J.
Valiente-Dobon, J. J.
Wyss, R.
Department of Chemistry
Publication Year :: 2020
Abstract: Excited states in the extremely neutron-deficient nucleus Pt-172 were populated via Ru-96(Kr-78, 2p) and Mo-92(Kr-83, 3n) reactions. The level scheme has been extended up to an excitation energy of approximate to 5MeV and tentative spin-parity assignments up to I-pi = 18(+). Linear polarization and angular distribution measurements were used to determine the electromagnetic E1 character of the dipole transitions connecting the positive-parity ground-state band with an excited side-band, firmly establishing it as a negativeparity band. The lowestmember of this negative-parity structure was firmly assigned spin-parity 3(-). In addition, we observed an E3 transition from this 3(-) state to the ground state, providing direct evidence for octupole collectivity in Pt-172. Large-scale shell model (LSSM) and total Routhian surface (TRS) calculations have been performed, supporting the interpretation of the 3(-) state as a collective octupole-vibrational state.