Abstract
A new object is proposed for checking the exponentiality of the decay law of an isolated metastable state at long times — the anomalously low-lying level 3/2+ (3.5±0.5 eV) in 229Th. Highly efficient excitation of this level by laser radiation in combination with optimal collection of optical photons emitted in an isomeric transition make it possible to achieve measurement times longer than 50T 1/2.
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Pis’ma Zh. Éksp. Teor. Fiz. 67, No. 8, 521–525 (25 April 1998)
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Dykhne, A.M., Tkalya, E.V. 229mTh(3/2+, 3.5 eV) and a check of the exponentiality of the decay law. Jetp Lett. 67, 549–552 (1998). https://doi.org/10.1134/1.567724
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DOI: https://doi.org/10.1134/1.567724