α -decay spectroscopy of the N=130 isotones Ra 218 and Th 220: Mitigation of α -particle energy summing with implanted nuclei



Parr, E, Smith, JF, Greenlees, PT, Auranen, K, Butler, PA, Chapman, R, Cox, DM, Cullen, DM, Gaffney, LP ORCID: 0000-0002-2938-3696, Grahn, T
et al (show 36 more authors) (2019) α -decay spectroscopy of the N=130 isotones Ra 218 and Th 220: Mitigation of α -particle energy summing with implanted nuclei. Physical Review C, 100 (4).

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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 Ra218→Rn214 and Th220→Ra216 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)%.

Item Type: Article
Depositing User: Symplectic Admin
Date Deposited: 01 Oct 2019 07:19
Last Modified: 25 Jan 2022 18:21
DOI: 10.1103/PhysRevC.100.044323
URI: https://livrepository.liverpool.ac.uk/id/eprint/3056466