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oai:gredos.usal.es:10366/1375412025-04-30T19:46:44Zcom_10366_4092com_10366_4055com_10366_3946com_10366_3823col_10366_4093

00925njm 22002777a 4500 dc Quintana Arnés, Begoña author Litzinger, J. author Blazhev, A. author 2015-12-29 [EN] Reduced quadrupole transition probabilities for low-lying transitions in neutron-rich Se-84,Se-86 are investigated with a recoil distance Doppler shift (RDDS) experiment. The experiment was performed at the Istituto Nazionale di Fisica Nucleare (INFN) Laboratori Nazionali di Legnaro using the Cologne Plunger device for the RDDS technique and the AGATA Demonstrator array for the gamma-ray detection coupled to the PRISMA magnetic spectrometer for an event-by-event particle identification. In Se-86 the level lifetime of the yrast 2(1)(+) state and an upper limit for the lifetime of the 4(1)(+) state are determined for the first time. The results of Se-86 are in agreement with previously reported predictions of large-scale shell-model calculations using Ni78-I and Ni78-II effective interactions. In addition, intrinsic shape parameters of lowest yrast states in Se-86 are calculated. In semimagic Se-84 level lifetimes of the yrast 4(1)(+) and 6(1)(+) states are determined for the first time. Large-scale shell-model calculations using effective interactions Ni78-II, JUN45, jj4b, and jj4pna are performed. The calculations describe B(E2; 2(1)(+) -> 0(1)(+)) and B(E2; 6(1)(+) -> 4(1)(+)) fairly well and point out problems in reproducing the experimental B(E2; 4(1)(+) -> 2(1)(+)). Quintana, B., Litzinger, J., Blazhev, A. (2015). Transition probabilities in neutron-rich Se-84, Se-86. Physical Review C, 92. Retrieved from Web of Science database. 0556-2813 http://hdl.handle.net/10366/137541 10.1103/PhysRevC.92.064322 Physics Shell-model Lifetime measurements Excited-states Excitations Transition probabilities in neutron-rich Se-84,Se-86