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Measurement of lifetimes in Fe-62,Fe-64, Co-61,Co-63, and Mn-59
Univ Oslo, Dept Phys, N-0316 Oslo, Norway..
Univ Paris Saclay, Univ Paris Sud, CNRS IN2P3, CSNSM, F-91405 Orsay, France..
Univ Oslo, Dept Phys, N-0316 Oslo, Norway..
Dipartimento Fis Astron Univ, I-35131 Padua, Italy.;INFN, Sez Padova, I-35131 Padua, Italy..
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2017 (English)In: PHYSICAL REVIEW C, ISSN 2469-9985, Vol. 95, no 2, 024312Article in journal (Refereed) Published
Abstract [en]

Lifetimes of the 4(1)(+) states in Fe-62,Fe-64 and the 11/2(1)(-) states in Co-61,Co-63 and Mn-59 were measured at the Grand Accelerateur 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 U-238 beam impinging on a Ni-64 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 nu 2p(1/2) and nu 1g(9/2) orbitals leads to an increased population of the quasi-SU(3) pair (nu 1g(9/2), nu 2d(5/2)), which causes an increase in quadrupole collectivity. This is not observed for the cobalt isotopes withN < 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.

Place, publisher, year, edition, pages
2017. Vol. 95, no 2, 024312
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:uu:diva-317948DOI: 10.1103/PhysRevC.95.024312ISI: 000393743300002OAI: oai:DiVA.org:uu-317948DiVA: diva2:1086351
Available from: 2017-04-01 Created: 2017-04-01 Last updated: 2017-04-01Bibliographically approved

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