Author:
Ertoprak A.,Cederwall B.,Qi C.,Aktas Ö.,Doncel M.,Hadinia B.,Liotta R.,Sandzelius M.,Scholey C.,Andgren K.,Bäck T.,Badran H.,Braunroth T.,Calverley T.,Cox D. M.,Cullen D. M.,Fang Y. D.,Ganioğlu 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.,Özgür I.,Page R. D.,Pakarinen J.,Papadakis P.,Partanen J.,Paul E. S.,Petrache C. M.,Peura P.,Rahkila P.,Ruotsalainen P.,Sarén J.,Sorri J.,Stolze S.,Subramaniam P.,Taylor M. J.,Uusitalo J.,Valiente-Dobón J. J.,Wyss R.
Abstract
AbstractExcited states in the extremely neutron-deficient nucleus $$^{172}{\mathrm {Pt}}$$172Pt were populated via $$^{96}\mathrm {Ru}(^{78}\mathrm {Kr},2p)$$96Ru(78Kr,2p) and $$^{92}\mathrm {Mo}(^{83}\mathrm {Kr},3n)$$92Mo(83Kr,3n) reactions. The level scheme has been extended up to an excitation energy of $$\approx 5~\hbox {MeV}$$≈5MeV and tentative spin-parity assignments up to $$I^\pi = 18^+$$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 firmly assigned spin-parity $$3^-$$3-. In addition, we observed an E3 transition from this $$3^-$$3- state to the ground state, providing direct evidence for octupole collectivity in $$^{172}{\mathrm {Pt}}$$172Pt. Large-scale shell model (LSSM) and total Routhian surface (TRS) calculations have been performed, supporting the interpretation of the $$3^-$$3- state as a collective octupole-vibrational state.
Funder
Royal Institute of Technology
Publisher
Springer Science and Business Media LLC
Subject
Nuclear and High Energy Physics