α-decay spectroscopy of the N=130 isotones Ra218 and Th220: Mitigation of α-particle energy summing with implanted nuclei

E. Parr et al.
Phys. Rev. C 100, 044323 – Published 30 October 2019

Abstract

An analysis technique has been developed in order to mitigate energy summing due to sequential short-lived α decays from nuclei implanted into a silicon detector. Using this technique, α-decay spectroscopy of the N=130 isotones Ra218 (Z=88) and Th220 (Z=90) has been performed. The energies of the α particles emitted in the Ra218Rn214 and Th220Ra216 ground-state-to-ground-state decays have been measured to be 8381(4) keV and 8818(13) keV, respectively. The half-lives of the ground states of Ra218 and Th220 have been measured to be 25.99(10) μs and 10.4(4) μs, respectively. The half-lives of the ground states of the α-decay daughters, Rn214 and Ra216, have been measured to be 259(3) ns and 161(11) ns, respectively. Fine structure in the α decay of Ra218 has been observed for the first time, populating the 695-keV 21+ state in Rn214. The fine-structure α decay has an α-particle energy of 7715(40) keV and branching ratio bα=0.123(11)%.

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  • Received 22 July 2019

DOI:https://doi.org/10.1103/PhysRevC.100.044323

©2019 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 100, Iss. 4 — October 2019

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