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

M. Klintefjord J. Ljungvall A. Görgen M. Lenzi F. Bello Garrote A. Blazhev E. Clément 1 G. de France 1 P. Delaroche 2 A. Dewald D. Doherty 3 C. Fransen A. Gengelbach G. Georgiev 4 M. Girod 2 A. Goasduff A. Gottardo K. Hadyńska-Klȩk B. Jacquot 1 P. Désesquelles 4 T. Konstantinopoulos 4 A. Korichi 4 A. Lemasson 1 J. Libert 2 A. Lopez-Martens 4 C. Michelagnoli 1 A. Navin 1 J. Nyberg R. Pérez-Vidal S. Roccia 4 E. Sahin I. Stefan E. Stuchbery M. Zielińska 3 D. Barrientos B. Birkenbach A. Boston L. Charles 5 M. Ciemala J. Dudouet 6 J. Eberth A. Gadea V. González L. Harkness-Brennan H. Hess A. Jungclaus W. Korten 3 R. Menegazzo D. Mengoni B. Million A. Pullia D. Ralet 4 F. Recchia P. Reiter M. D. Salsac 3 E. Sanchis O. Stezowski 6 Ch. Theisen 3 J. J. Valiente Dobon
1 GANIL - Grand Accélérateur National d'Ions Lourds
2 DAM/DIF - DAM Île-de-France
3 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
4 CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière
5 IPHC - Institut Pluridisciplinaire Hubert Curien
6 IPNL - Institut de Physique Nucléaire de Lyon
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
Last modification on : Tuesday, January 14, 2020 - 9:06:02 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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