Decay of neutron-rich Mn nuclides and deformation of heavy Fe isotopes

Details Decay of neutron-rich Mn nuclides and deformation of heavy Fe isotopes Decay of neutron-rich Mn nuclides and deformation of heavy Fe isotopes

1998-12-21

arxiv.org/abs/nucl-ex/9812008v1

Phys.Rev.Lett. 82 (1999) 1391-1394

Physics

Nuclear Physics

Nuclear Experiment

Latex-file with 4 figures, 5 pages, Phys. Rev. Lett., in print

Scientific paper

10.1103/PhysRevLett.82.1391

The use of chemically selective laser ionization combined with beta-delayed neutron counting at CERN/ISOLDE has permitted identification and half-life measurements for 623-ms Mn-61 up through 14-ms Mn-69. The measured half-lives are found to be significantly longer near N=40 than the values calculated with a QRPA shell model using ground-state deformations from the FRDM and ETFSI models. Gamma-ray singles and coincidence spectroscopy has been performed for Mn-64 and Mn-66 decays to levels of Fe-64 and Fe-66, revealing a significant drop in the energy of the first 2+ state in these nuclides that suggests an unanticipated increase in collectivity near N=40.

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