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Beta-decay of Mn-65 to Fe-65

Abstract : The low energy structure of Fe-65 has been studied by means of gamma- and fast-timing spectroscopy. A level scheme of Fe-65 populated following the beta-decay of Mn-65 was established for the first time. It includes 41 levels and 85 transitions. The excitation energy of the beta-decaying isomer in Fe-65 has been precisely determined at 393.7(2) keV. The beta delayed neutron emission branch was measured as Pn = 7.9(12)%, which cannot be reconciled with the previously reported value of 21.0(5)%. Four gamma-rays and four excited states in Fe-64 were identified as being populated following the beta-n decay. Four lifetimes and five lifetime limits in the subnanosecond range have been measured using the Advanced Time-Delayed Method. The level scheme is compared with shell-model calculations. Tentative spin and parity assignments are proposed based on the observed transition rates, the calculations and the systematics of the region.
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Submitted on : Thursday, August 29, 2013 - 8:25:22 AM
Last modification on : Thursday, November 19, 2020 - 12:58:52 PM

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B. Olaizola, L. M. Fraile, H. Mach, A. Aprahamian, J. A. Briz, et al.. Beta-decay of Mn-65 to Fe-65. Physical Review C, American Physical Society, 2013, 88, pp.044306. ⟨10.1103/PhysRevC.88.044306⟩. ⟨in2p3-00855155⟩



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