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α decay of Re159 and proton emission from Ta155

R. D. Page et al.
Phys. Rev. C 75, 061302(R) – Published 26 June 2007

Abstract

The α decay of Re159 has been observed for the first time in reactions of 300 MeV Ni58 ions with an isotopically enriched Cd106 target. The Re159 ions were separated in-flight using the RITU separator and implanted into the GREAT spectrometer. The α decay emanates from the proton-emitting πh11/2 state in Re159 with an energy of Eα=6776±26 keV and a branching ratio of 7.5 ± 3.5%. This α decay populates a state in the closed neutron shell nucleus Ta155, which decays by emitting 1444 ± 15 keV protons with a half-life of 2.91.1+1.5 ms. These values are consistent with the emission of the proton from a πh11/2 orbital. These results fit in with the systematics of proton and α-particle separation energies in the region, but disagree with the previously reported decay properties of Ta155.

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  • Received 14 March 2007

DOI:https://doi.org/10.1103/PhysRevC.75.061302

©2007 American Physical Society

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Vol. 75, Iss. 6 — June 2007

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