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

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 calculat...

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Detalles Bibliográficos
Autores principales: Hannawald, M, Kautzsch, T, Wöhr, A, Walters, W B, Kratz, K L, Fedosseev, V, Mishin, V I, Böhmer, W, Pfeiffer, B, Sebastian, V, Jading, Y, Köster, U, Lettry, Jacques, Ravn, H L
Lenguaje:eng
Publicado: 1999
Materias:
Nuclear Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1103/PhysRevLett.82.1391
http://cds.cern.ch/record/375032
Descripción
Sumario: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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