Evidence for the Scissors Mode in Tb-160 from the Two-Step Gamma Cascades Measurement

0486768 - ÚJF 2018 US eng C - Conference Paper (international conference)
Kroll, J. - Bečvář, F. - Krtička, M. - Tomandl, Ivo
Evidence for the Scissors Mode in Tb-160 from the Two-Step Gamma Cascades Measurement.
AIP Conferenece Proceedings. Vol. 1377. Melville: American Institute of Physics, 2011, s. 371-373. ISBN 978-0-7354-0937-8. ISSN 0094-243X.
[3rd International Conference on Frontiers in Nuclear Structure, Astrophysics and Reactions (FINUSTAR). Rhodes (GR), 23.08.2010-27.08.2010]
Institutional support: RVO:61389005
Keywords : photon strength functions * level density * Scissors Mode
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders

pectra of two-step gamma cascades (TSCs) following the neutron capture in Tb-159 were measured by the sum-coincidence technique with a two-HPGe-detector facility [1] installed at a pure sub-thermal neutron beam of the 15 MW light-water research reactor at Rez near Prague. In order to obtain information about the quantities governing the gamma decay of Tb-160 levels - the photon strength functions (PSFs) and the level density (LD) - experimental TSC spectra were compared with the output of simulations of the gamma cascade decay based on the validity of extreme statistical model. These simulations were performed with the aid of the DICEBOX algorithm [2] assuming various combinations of the PSFs and LD. The results obtained lead to an inescapable conclusion that the Scissors Mode (SM) plays a crucial role in the cascade gamma decay of the product nucleus Tb-160. This finding represents the first evidence for the existence of the SM in an odd-odd nucleus.
Permanent Link: http://hdl.handle.net/11104/0281497