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Identification of the one-quadrupole phonon state of 204Hg

Stegmann, R. and Stahl, C. and Rainovski, G. and Pietralla, N. and Stoyanov, C. and Carpenter, M. P. and Janssens, R. V. F. and Lettmann, M. and Möller, T. and Möller, O. and Werner, V. and Zhu, S. (2017):
Identification of the one-quadrupole phonon state of 204Hg.
In: Physics Letters B, pp. 77 - 82, 770, ISSN 0370-2693,
[Online-Edition: http://www.sciencedirect.com/science/article/pii/S0370269317...],
[Article]

Abstract

Abstract One-phonon states of vibrational nuclei with mixed proton–neutron symmetry have been observed throughout the nuclear chart besides the mass A ≈ 200 region. Very recently, it has been proposed that the 2 2 + state of 212Po is of isovector nature. This nucleus has two valence protons and two valence neutrons outside the doubly-magic 208Pb nucleus. The stable isotope 204Hg, featuring two valence-proton and valence-neutron holes, with respect to 208Pb, is the particle-hole mirror of 212Po. In order to compare the properties of low-lying isovector excitations in these particle-hole mirror nuclei, we have studied 204Hg by using the projectile Coulomb-excitation technique. The measured absolute B ( M 1 ; 2 2 + → 2 1 + ) strength of 0.20 ( 2 ) μ N 2 indicates that the 2 2 + level of 204Hg is at least the main fragment of the 2 1 , m s + state. For the first time in this mass region, both lowest-lying, one-quadrupole phonon excitations are established together with the complete set of their decay strengths. This allows for a microscopic description of their structures, achieved in the framework of the Quasi-particle Phonon Model.

Item Type: Article
Erschienen: 2017
Creators: Stegmann, R. and Stahl, C. and Rainovski, G. and Pietralla, N. and Stoyanov, C. and Carpenter, M. P. and Janssens, R. V. F. and Lettmann, M. and Möller, T. and Möller, O. and Werner, V. and Zhu, S.
Title: Identification of the one-quadrupole phonon state of 204Hg
Language: English
Abstract:

Abstract One-phonon states of vibrational nuclei with mixed proton–neutron symmetry have been observed throughout the nuclear chart besides the mass A ≈ 200 region. Very recently, it has been proposed that the 2 2 + state of 212Po is of isovector nature. This nucleus has two valence protons and two valence neutrons outside the doubly-magic 208Pb nucleus. The stable isotope 204Hg, featuring two valence-proton and valence-neutron holes, with respect to 208Pb, is the particle-hole mirror of 212Po. In order to compare the properties of low-lying isovector excitations in these particle-hole mirror nuclei, we have studied 204Hg by using the projectile Coulomb-excitation technique. The measured absolute B ( M 1 ; 2 2 + → 2 1 + ) strength of 0.20 ( 2 ) μ N 2 indicates that the 2 2 + level of 204Hg is at least the main fragment of the 2 1 , m s + state. For the first time in this mass region, both lowest-lying, one-quadrupole phonon excitations are established together with the complete set of their decay strengths. This allows for a microscopic description of their structures, achieved in the framework of the Quasi-particle Phonon Model.

Journal or Publication Title: Physics Letters B
Volume: 770
Uncontrolled Keywords: Shell structure
Divisions: 05 Department of Physics
05 Department of Physics > Institute of Nuclear Physics
Date Deposited: 05 May 2017 10:44
Official URL: http://www.sciencedirect.com/science/article/pii/S0370269317...
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