Identification of the one-quadrupole phonon state of 204Hg
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) μ 2 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. In conclusion, this allows for a microscopic description of their structures, achieved in the framework of the Quasi-particle Phonon Model.
- Authors:
-
[1];
[1];
[2];
[1];
[3] ; [4]; [4]; [1]; [1]; [1]; [1]; [4]
- Technische Univ. Darmstadt, Darmstadt (Germany)
- Univ. of Sofia St. Kliment Ohridski, Sofia (Bulgaria)
- Bulgarian Academy of Sciences, Sofia (Bulgaria)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Publication Date:
- Grant/Contract Number:
- AC02-06CH11357
- Type:
- Published Article
- Journal Name:
- Physics Letters. Section B
- Additional Journal Information:
- Journal Volume: 770; Journal Issue: C; Journal ID: ISSN 0370-2693
- Publisher:
- Elsevier
- Research Org:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org:
- USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; γ ray spectroscopy; Coulomb excitation; Quadrupole collectivity; Isospin degree of freedom; Shell structure
- OSTI Identifier:
- 1352288
- Alternate Identifier(s):
- OSTI ID: 1389632