Results of a direct search using synchrotron radiation for the low-energy ²²⁹Th nuclear isomeric transition

2015/02/07 by Justin Jeet, J. Jeet, Jeet, Justin +16 · 2 citations
Engineering · Physics and Astronomy · #Atomic Physics (physics.atom-ph) #Atomic and Subatomic Physics Research #FOS: Physical sciences #Nuclear Experiment (nucl-ex) #Nuclear physics research studies #Particle Accelerators and Free-Electron Lasers #nucl-ex #physics.atom-ph

paper · pdf · doi:10.48550/arxiv.1502.02189

6 pages, 4 figures

openalex publication_date 2015/02/07 · arxiv created 2015/02/18 · arxiv updated 2015/02/19 · openalex created_date 2022/10/03 · openalex updated_date 2026/07/28

Abstract

We report the results of a direct search for the ²²⁹Th (I^p = 3/2⁺← 5/2⁺) nuclear isomeric transition, performed by exposing ²²⁹Th-doped LiSrAlF₆ crystals to tunable vacuum-ultraviolet synchrotron radiation and observing any resulting fluorescence. We also use existing nuclear physics data to establish a range of possible transition strengths for the isomeric transition. We find no evidence for the thorium nuclear transition between 7.3 eV and 8.8 eV with transition lifetime (1-2)s \lesssim τ\lesssim (2000-5600)s. This measurement excludes roughly half of the favored transition search area and can be used to direct future searches.

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