6533b836fe1ef96bd12a1b41
RESEARCH PRODUCT
α -decay spectroscopy of the N=130 isotones Ra 218 and Th 220: Mitigation of α -particle energy summing with implanted nuclei
E ParrJf SmithPt GreenleesK AuranenPa ButlerR ChapmanDm CoxDm CullenLp GaffneyT GrahnEt GregorL GrocuttA HerzáňRd HerzbergD HodgeU JakobssonR JulinS JuutinenJ KeatingsJ KonkiM LeinoPp MckeeC McpeakeD MengoniAk MistryKf MulhollandBs Nara SinghGg O'neillJ PakarinenP PapadakisJ PartanenP PeuraP RahkilaP RuotsalainenM SandzeliusJ SarénM ScheckC ScholeyM SicilianoM SmolenJ SorriP SpagnolettiKm SpohrS StolzeMj TaylorJ Uusitalosubject
description
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)%.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-10-30 |