De-excitation of the strongly coupled band in Au-177 and implications for core intruder configurations in the light Hg isotopes

Venhart, M.; Ali, F.; Ryssens, W.; Wood, J.; Joss, D.; Andreyev, A.; Auranen, K.; Bally, B.; Balogh, M.; Bender, M.; Carroll, R.; Easton, J.; Greenlees, P.; Grahn, T.; Heenen, P.; Herzan, A.; Jakobsson, U.; Julin, R.; Juutinen, S.; Kic, D.; Konki, J.; Lawrie, E.; Leino, M.; Matousek, V.; McPeake, C.; O'Donnell, D.; Page, R.; Pakarinen, J.; Partanen, J.; Peura, P.; Rahkila, P.; Ruotsalainen, P.; Sandzelius, M.; Saren, J.; Saygi, BAHADIR; Sedlak, M.; Scholey, C.; Sorri, J.; Stolze, S.; Thornthwaite, A.; Uusitalo, J.; Veselsky, M.

doi:10.1103/physrevc.95.061302

De-excitation of the strongly coupled band in Au-177 and implications for core intruder configurations in the light Hg isotopes

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Venhart M., Ali F. A., Ryssens W., Wood J. L., Joss D. T., Andreyev A. N., ...More

PHYSICAL REVIEW C, vol.95, no.6, 2017 (SCI-Expanded)

Publication Type: Article / Article
Volume: 95 Issue: 6
Publication Date: 2017
Doi Number: 10.1103/physrevc.95.061302
Journal Name: PHYSICAL REVIEW C
Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
Ankara University Affiliated: No

Abstract

Excited states in the proton-unbound nuclide Au-177 were populated in the Mo-92(Sr-88, p2n) reaction and identified using the Jurogam-II and GREAT spectrometers in conjunction with the RITU gas-filled separator at the University of Jyvaskyla Accelerator Laboratory. A strongly coupled band and its decay path to the 11/2 alpha-decaying isomer have been identified using recoil-decay tagging. Comparisons with cranked Hartree-Fock-Bogoliubov (HFB) calculations based on Skyrme energy functionals suggest that the band has a prolate deformation and is based upon coupling the odd 1h(11/2) proton hole to the excited 0(2)(+) configuration in the Hg-178 core. Although these configurations might be expected to follow the parabolic trend of core Hg(0(2)(+)) states as a function of neutron number, the electromagnetic decay paths from the strongly coupled band in Au-177 are markedly different from those observed in the heavier isotopes above the midshell. This indicates that a significant change in the structure of the underlying (A+) Hg-1 core occurs below the neutron midshell.