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; G. de France; P. Delaroche; A. Dewald; D. Doherty; C. Fransen; A. Gengelbach; G. Georgiev; M. Girod; A. Goasduff; A. Gottardo; K. Hadyńska-Klȩk; B. Jacquot; P. Désesquelles; T. Konstantinopoulos; A. Korichi; A. Lemasson; J. Libert; A. Lopez-Martens; C. Michelagnoli; A. Navin; J. Nyberg; R. Pérez-Vidal; S. Roccia; E. Sahin; I. Stefan; E. Stuchbery; M. Zielińska; D. Barrientos; B. Birkenbach; A. Boston; L. Charles; M. Ciemala; J. Dudouet; J. Eberth; A. Gadea; V. González; L. Harkness-Brennan; H. Hess; A. Jungclaus; W. Korten; R. Menegazzo; D. Mengoni; B. Million; A. Pullia; D. Ralet; F. Recchia; P. Reiter; M. D. Salsac; E. Sanchis; O. Stezowski; Ch. Theisen; J. J. Valiente Dobon

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.

Document type :

Journal articles

Domain :

Physics [physics] / Nuclear Experiment [nucl-ex]

Complete list of metadatas

http://hal.in2p3.fr/in2p3-01468946
Contributor : Sylvie Flores <>
Submitted on : Thursday, February 16, 2017 - 8:05:25 AM
Last modification on : Thursday, February 7, 2019 - 2:57:48 PM

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

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

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