Evidence for octupole collectivity in 172 Pt
Excited states in the extremely neutron-deficient nucleus 172 Pt were populated via 96 Ru( 78 Kr,2p) and 92 Mo( 83 Kr,3n) reactions. The level scheme has been extended up to an excitation energy of ~ 5 MeV and tentative spin-parity assignments up to I π = 18 + . Linear polarization and angular dis...
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Published in | The European physical journal. A, Hadrons and nuclei Vol. 56; no. 2 |
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Main Authors | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
2020
|
Online Access | Get full text |
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Summary: | Excited states in the extremely neutron-deficient nucleus 172 Pt were populated via 96 Ru( 78 Kr,2p) and 92 Mo( 83 Kr,3n) reactions. The level scheme has been extended up to an excitation energy of ~ 5 MeV and tentative spin-parity assignments up to I π = 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 - . In addition, we observed an E3 transition from this 3 - state to the ground state, providing direct evidence for octupole collectivity in 172 Pt. 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. |
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ISSN: | 1434-6001 1434-601X |
DOI: | 10.1140/epja/s10050-020-00071-6 |