Evidence for Octupole Collectivity in 172Pt

David Cullen; Michael Giles; Duncan Hodge; B S Nara Singh; Michael Taylor

doi:10.1140/epja/s10050-020-00071-6

Evidence for Octupole Collectivity in 172Pt

David Cullen, Michael Giles, Duncan Hodge, B S Nara Singh, Michael Taylor

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Abstract

Excited states in the extremely neutron-deﬁcient 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 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 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 language	English
Journal	The European Physical Journal
Early online date	20 Feb 2020
DOIs	https://doi.org/10.1140/epja/s10050-020-00071-6
Publication status	E-pub ahead of print - 20 Feb 2020

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172Pt_octupole_EPJ_v4Accepted author manuscript, 14.3 MB

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title = "Evidence for Octupole Collectivity in 172Pt",

abstract = "Excited states in the extremely neutron-deﬁcient 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 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 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.",

author = "David Cullen and Michael Giles and Duncan Hodge and Singh, {B S Nara} and Michael Taylor",

year = "2020",

month = feb,

day = "20",

doi = "10.1140/epja/s10050-020-00071-6",

language = "English",

journal = "The European Physical Journal",

issn = "1286-0042",

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TY - JOUR

T1 - Evidence for Octupole Collectivity in 172Pt

AU - Cullen, David

AU - Giles, Michael

AU - Hodge, Duncan

AU - Singh, B S Nara

AU - Taylor, Michael

PY - 2020/2/20

Y1 - 2020/2/20

N2 - Excited states in the extremely neutron-deﬁcient 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 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 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.

AB - Excited states in the extremely neutron-deﬁcient 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 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 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.

U2 - 10.1140/epja/s10050-020-00071-6

DO - 10.1140/epja/s10050-020-00071-6

M3 - Article

SN - 1286-0042

JO - The European Physical Journal

JF - The European Physical Journal

ER -

Evidence for Octupole Collectivity in 172Pt

Abstract

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