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Title	Measurement of lifetimes in $^{62,64}$Fe,$^{61,63}$Co , and $^{59}$Mn
Author(s)	Klintefjord, M (Oslo U.) ; Ljungvall, J (CSNSM, Orsay) ; Görgen, A (Oslo U.) ; Lenzi, S M (INFN, Padua ; Padua U.) ; Bello Garrote, F L (Oslo U) ; Blazhev, A (Cologne U.) ; Clément, E (GANIL) ; de France, G (GANIL) ; Delaroche, J P (CEA DAM) ; Désesquelles, P (CSNSM, Orsay) ; Dewald, A (Cologne U.) ; Doherty, D T (IRFU, Saclay) ; Fransen, C (Cologne U.) ; Gengelbach, A (Uppsala U.) ; Georgiev, G (CSNSM, Orsay) ; Girod, M (CEA DAM) ; Goasduff, A (INFN, Legnaro) ; Gottardo, A (Orsay, IPN) ; Hadyńska-Klȩk, K (Oslo U.) ; Jacquot, B (GANIL) ; Konstantinopoulos, T (CSNSM, Orsay) ; Korichi, A (CSNSM, Orsay) ; Lemasson, A (GANIL) ; Libert, J (Orsay, IPN) ; Lopez-Martens, A (CSNSM, Orsay) ; Michelagnoli, C (GANIL) ; Navin, A (GANIL) ; Nyberg, J (Uppsala U.) ; Pérez-Vidal, R M (Valencia U., IFIC) ; Roccia, S (CSNSM, Orsay) ; Sahin, E (Uppsala U.) ; Stefan, I (Orsay, IPN) ; Stuchbery, A E (Australian Natl. U., Canberra (main)) ; Zielińska, M (IRFU, Saclay) ; Barrientos, D (CERN) ; Birkenbach, B (Cologne U.) ; Boston, A (Liverpool U.) ; Charles, L (Strasbourg, IPHC) ; Ciemala, M (Cracow, INP) ; Dudouet, J (Lyon, IPN) ; Eberth, J (Cologne U.) ; Gadea, A (Valencia U., IFIC) ; González, V (Valencia U., Dept. Ing. Electronica) ; Harkness-Brennan, L (Liverpool U.) ; Hess, H (Cologne U.) ; Jungclaus, A (Madrid, Inst. Estructura Materia) ; Korten, W (IRFU, Saclay) ; Menegazzo, R (INFN, Padua) ; Mengoni, D (INFN, Padua ; Padua U.) ; Million, B (INFN, Padua) ; Pullia, A ; Ralet, D (CSNSM, Orsay ; Darmstadt, Tech. Hochsch. ; Darmstadt, GSI) ; Recchia, F (INFN, Padua ; Padua U.) ; Reiter, P (Cologne U.) ; Salsac, M D (IRFU, Saclay) ; Sanchis, E (Valencia U., Dept. Ing. Electronica) ; Stezowski, O (Lyon, IPN) ; Theisen, Ch (IRFU, Saclay) ; Valiente Dobon, J J (INFN, Legnaro)
Publication	2017
Number of pages	11
In:	Phys. Rev. C 95 (2017) 024312
DOI	10.1103/PhysRevC.95.024312
Subject category	Nuclear Physics - Experiment
Accelerator/Facility, Experiment	AGATA
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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