Evidence for Octupole Collectivity in 172Pt

A. Ertoprak*, B. Cederwall, C. Qi, Ö. Aktaş, M. Doncel, B. Hadinia, R. Liotta, M. Sandzelius, C. Scholey, K. Andgren, T. Back, H. Badran, T. Braunroth, T. Calverley, D.M. Cox, D.M. Cullen, Y.D. Fang, E. Ganioğlu, M. Giles, M.B. Gomez HornillosT. Grahn, P.T. Greenlees, J. Hilton, D. Hodge, E. Ideguchi, U. Jakobsson, A. Johnson, P.M. Jones, R. Julin, S. Juutinen, S. Ketelhut, A. Khaplanov, M. Kumar Raju, M. Leino, H. Li, H. Liu, S. Matta, V. Modiamo, B.S. Nara Singh, M. Niikura, M. Nyman, I. Ozgur, R.D. Page, J. Pakarinen, P. Papadakis, J. Partanen, E.S. Paul, C.M. Petrache, P. Peura, P. Rahkila, P. Ruotsalainen, J. Sarén, J. Sorri, S. Stolze, P. Subramaniam, M.J. Taylor, J. Uusitalo, J.J. Valiente-Dobón, R. Wyss

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Abstract

Excited states in the extremely neutron-decient nucleus 172Pt were populated via 96Ru(78Kr; 2p) and 92Mo(83Kr; 3n) reactions. The level scheme has been extended up to an excitation energy of ≈ 5 MeV and tentative spin-parity assignments up to Iπ = 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 negative-parity band. The lowest member of this negative-parity structure was rmly 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 172Pt. 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.
Original languageEnglish
Article number65
Number of pages9
JournalThe European Physical Journal A
Volume56
Early online date20 Feb 2020
DOIs
Publication statusE-pub ahead of print - 20 Feb 2020

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Ertoprak, A., Cederwall, B., Qi, C., Aktaş, Ö., 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., Ganioğlu, E., Giles, M., ... Wyss, R. (2020). Evidence for Octupole Collectivity in 172Pt. The European Physical Journal A, 56, [65]. https://doi.org/10.1140/epja/s10050-020-00071-6