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

M. Venhart, F. A. Ali, W. Ryssens, J. L. Wood, D. T. Joss, A. N. Andreyev, K. Auranen, B. Bally, M. Balogh, M. Bender, R. J. Carroll, J. L. Easton, P. T. Greenlees, T. Grahn, P.-H. Heenen, A. Herzáifmmode ecknelse n, U. Jakobsson, R. Julin, S. Juutinen, D. Kifmmode lelse ifmmode eckcelse cJ. Konki, E. Lawrie, M. Leino, V. Matouifmmode eckselse sek, C. G. McPeake, D. O'Donnell, R. D. Page, J. Pakarinen, J. Partanen, P. Peura, P. Rahkila, P. Ruotsalainen, M. Sandzelius, J. Sarén, Sayifmmode gelse B., M. Sedlák, C. Scholey, J. Sorri, S. Stolze, A. Thornthwaite, J. Uusitalo, M. Veselský

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Excited states in the proton-unbound nuclide 177Au were populated in the 92Mo(88Sr, p2n) reaction and identified using the Jurogam-II and GREAT spectrometers in conjunction with the RITU gas-filled separator at the University of Jyväskylä Accelerator Laboratory. A strongly coupled band and its decay path to the
11/2− α-decaying isomer have been identified using recoil-decay tagging. Comparisons with cranked HartreeFock-Bogoliubov (HFB) calculations based on Skyrme energy functionals suggest that the band has a prolate
deformation and is based upon coupling the odd 1h11/2 proton hole to the excited 0+
2 configuration in the 178Hg
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 177Au 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+1Hg core occurs below the neutron midshell.
Original languageEnglish
Article number061302
Pages (from-to)1-5
Number of pages5
JournalPhysical Review C - Nuclear Physics
Publication statusPublished - 1 Jun 2017

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