Measurement of lifetimes in $^{62,64}$Fe, $^{61,63}$Co, and $^{59}$Mn

Abstract : Lifetimes of the 41+ states in 62,64Fe and the 11/21− states in 61,63Co and 59Mn were measured at the Grand Accélérateur 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 U238 beam impinging on a Ni64 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 ν2p1/2 and ν1g9/2 orbitals leads to an increased population of the quasi-SU(3) pair (ν1g9/2,ν2d5/2), which causes an increase in quadrupole collectivity. This is not observed for the cobalt isotopes with N<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.
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Submitted on : Thursday, February 16, 2017 - 8:05:25 AM
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M. Klintefjord, J. Ljungvall, A. Görgen, M. Lenzi, F. Bello Garrote, et al.. Measurement of lifetimes in $^{62,64}$Fe, $^{61,63}$Co, and $^{59}$Mn. Physical Review C, American Physical Society, 2017, 95 (2), pp.024312. ⟨10.1103/PhysRevC.95.024312⟩. ⟨in2p3-01468946⟩

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