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Identification of the one-quadrupole phonon21,ms+state of 204 Hg

Stegmann, Robert ; Stahl, Christian ; Rainovski, Georgi ; Pietralla, Norbert A. ; Stoyanov, Chavdar ; Carpenter, Michael P. ; Janssens, Robert V. F. ; Lettmann, Marc ; Möller, Th. ; Möller, Oliver ; Werner, Volker ; Zhu, Shaofei (2022):
Identification of the one-quadrupole phonon21,ms+state of 204 Hg. (Publisher's Version)
In: Physics Letters B, 770, pp. 77-82. Elsevier, ISSN 0370-2693, e-ISSN 1873-2445,
DOI: 10.26083/tuprints-00012732,
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Item Type: Article
Origin: Secondary publication
Status: Publisher's Version
Title: Identification of the one-quadrupole phonon21,ms+state of 204 Hg
Language: English
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(M1; 2+2 → 2+1 )strength of 0.20 (2)μ2 N indicates that the 2+2 level of ²⁰⁴Hg is at least the main fragment of the 2+1,ms 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
Journal volume: 770
Publisher: Elsevier
Classification DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Divisions: 05 Department of Physics > Institute of Nuclear Physics
Date Deposited: 24 Mar 2022 13:21
Last Modified: 24 Mar 2022 13:21
DOI: 10.26083/tuprints-00012732
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-127327
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/12732
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