"Lifetime measurement in neutron rich Fe and Co isotopes applying the recoil distance Doppler Shift Method to Deep Inelastic Reactions"
Aurore DIJON, GANIL
(id #150)
Seminar: YesPoster: No
Invited talk: No
Lifetime measurement in neutron rich Fe and Co isotopes applying the recoil distance Doppler Shift Method to Deep Inelastic Reactions
A.Dijon, J.Ljungvall, E.Clément, G. de France, A Görgen, A Obertelli, W Korten, A Bürger, JP Delaroche, A Dewald , A Gadea, L Gaudefroy, M Girod, M Hackstein, J Libert, D Mengoni, F Nowacki, T Pissula, A Poves, F Recchia, M Rejmund, W Rother, E Sahin, C Schmitt, A Shrivastava, K Sieja, JJ Valiente-Dobon, KO Zell, M Zielinska
GANIL, Caen, France
CSNSM, Orsay,France
Department of Physics, Univ. of Oslo, Norway
CEA Saclay, IRFU, France
CEA, DAM, France
Institüt für Kernphysik, Köln, Germany
Instituto de Fisica Corpuscular, CSIC, Valencia, Spain
IPNO, Orsay, France
INFN-Padova, Italy
IPHC, Strasbourg, France
Departamento de Fisica Teorica, Madrid, Spain
INFN-Legnaro, Italy
HIL, Warsaw, Poland
Excited states in a wide range of neutron rich nuclei around 68Ni has been studied in multi nucleon transfer reactions in inverse kinematics between 238U at 6.5 A MeV and a 64Ni target using the large acceptance spectrometer VAMOS and the segmented germanium clover detectors EXOGAM at GANIL.
The lifetimes of the first excited 2+ states in 62Fe and 64Fe have been measured for the first time using the recoil-distance Doppler shift method. A sudden increase of collectivity from 62Fe to 64Fe has been observed and probe the weakness of the N=40 subshell gap. This observation is confirmed by the onset of a collective character in the neutron rich zinc and germanium isotopes. Moreover, collective 7/2- states observed in the structure of copper isotopes above nickel can be interpreted as a one proton in the p3/2 orbital coupled to the first 2+ state in nickel isotones. Similarly, a one proton hole in the f7/2 orbital coupled to the first 2+ state in nickel isotones would induce some collectivity in the cobalt isotopes as suggested by D. Pauwels et al. To demonstrate this, the lifetime of the first excited 9/2- state in 63-65Co has been measured and the B(E2) transition probability extracted.
The data extracted from this experiment have been compared with large scale shell model calculations performed with ANTOINE code in the fp model space leading to a better understanding of the mechanism at the origin of the onset of collectivity around 68Ni.
A.Dijon, J.Ljungvall, E.Clément, G. de France, A Görgen, A Obertelli, W Korten, A Bürger, JP Delaroche, A Dewald , A Gadea, L Gaudefroy, M Girod, M Hackstein, J Libert, D Mengoni, F Nowacki, T Pissula, A Poves, F Recchia, M Rejmund, W Rother, E Sahin, C Schmitt, A Shrivastava, K Sieja, JJ Valiente-Dobon, KO Zell, M Zielinska
GANIL, Caen, France
CSNSM, Orsay,France
Department of Physics, Univ. of Oslo, Norway
CEA Saclay, IRFU, France
CEA, DAM, France
Institüt für Kernphysik, Köln, Germany
Instituto de Fisica Corpuscular, CSIC, Valencia, Spain
IPNO, Orsay, France
INFN-Padova, Italy
IPHC, Strasbourg, France
Departamento de Fisica Teorica, Madrid, Spain
INFN-Legnaro, Italy
HIL, Warsaw, Poland
Excited states in a wide range of neutron rich nuclei around 68Ni has been studied in multi nucleon transfer reactions in inverse kinematics between 238U at 6.5 A MeV and a 64Ni target using the large acceptance spectrometer VAMOS and the segmented germanium clover detectors EXOGAM at GANIL.
The lifetimes of the first excited 2+ states in 62Fe and 64Fe have been measured for the first time using the recoil-distance Doppler shift method. A sudden increase of collectivity from 62Fe to 64Fe has been observed and probe the weakness of the N=40 subshell gap. This observation is confirmed by the onset of a collective character in the neutron rich zinc and germanium isotopes. Moreover, collective 7/2- states observed in the structure of copper isotopes above nickel can be interpreted as a one proton in the p3/2 orbital coupled to the first 2+ state in nickel isotones. Similarly, a one proton hole in the f7/2 orbital coupled to the first 2+ state in nickel isotones would induce some collectivity in the cobalt isotopes as suggested by D. Pauwels et al. To demonstrate this, the lifetime of the first excited 9/2- state in 63-65Co has been measured and the B(E2) transition probability extracted.
The data extracted from this experiment have been compared with large scale shell model calculations performed with ANTOINE code in the fp model space leading to a better understanding of the mechanism at the origin of the onset of collectivity around 68Ni.
