%0 Journal Article
%T Measurement of lifetimes in Fe-62,Fe-64, Co-61,Co-63, and Mn-59
%A AGATA Collaboration (Klintefjord, M. et al
%A Gadea, A.
%A Perez-Vidal, R. M.
%J Physical Review C
%D 2017
%V 95
%N 2
%I Amer Physical Soc
%@ 2469-9985
%G English
%F AGATACollaborationKlintefjord_etal2017
%O WOS:000393743300002
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=2958), last updated on Thu, 23 Mar 2017 12:12:31 +0000
%X Lifetimes of the 4(1)(+) states in Fe-62,Fe-64 and the 11/2(1)(-) states in Co-61,Co-63 and Mn-59 were measured at the Grand Accelerateur National d'Ions Lourds (GANIL) facility by using the Advanced Gamma Tracking Array (AGATA) and the large-acceptance variable mode spectrometer (VAMOS++). The states were populated through multinucleon transfer reactions with a U-238 beam impinging on a Ni-64 target, and lifetimes in the picosecond range were measured by using the recoil distance Doppler shift method. The data show an increase of collectivity in the iron isotopes approaching N = 40. The reduction of the subshell gap between the nu 2p(1/2) and nu 1g(9/2) orbitals leads to an increased population of the quasi-SU(3) pair (nu 1g(9/2), nu 2d(5/2)), which causes an increase in quadrupole collectivity. This is not observed for the cobalt isotopes withN < 40 for which the neutron subshell gap is larger due to the repulsive monopole component of the tensor nucleon-nucleon interaction. The extracted experimental B(E2) values are compared with large-scale shell-model calculations and with beyond-mean-field calculations with the Gogny D1S interaction. A good agreement between calculations and experimental values is found, and the results demonstrate in particular the spectroscopic quality of the Lenzi, Nowacki, Poves, and Sieja (LNPS) shell-model interaction.
%R 10.1103/PhysRevC.95.024312
%U https://doi.org/10.1103/PhysRevC.95.024312
%P 024312-11pp