Parr, E, Smith, JF, Greenlees, PT, Auranen, K, Butler, PA 
ORCID: 0000-0001-6080-9205, 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).
044323-.
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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: | 15 Mar 2024 11:03 |
| DOI: | 10.1103/PhysRevC.100.044323 |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3056466 |
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