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Issue 3, 2026
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Accepted articles
Conferences and symposia


Two-photon laser generation of exciton states in krypton cryocrystals as a method for excitation of an anomalous low-energy isomeric nuclear state in the Thorium-229 isotope

 a,  a,  a,  b,  a,  a,  a, c,  a,  a,  a,  a,  a, d, e
a National Research Nuclear University ‘MEPhI’, Kashirskoe shosse 31, Moscow, 115409, Russian Federation
b Avesta Project Ltd., Fizicheskaya Street 11, Troitsk, Moscow, 108840, Russian Federation
c Moscow Institute of Physics and Technology (National Research University), Institutskii per. 9, Dolgoprudny, Moscow Region, 141701, Russian Federation
d Lebedev Physical Institute, Russian Academy of Sciences, Leninsky prosp. 53, Moscow, 119991, Russian Federation
e Nuclear Safety Institute, Russian Academy of Sciences, ul. Bolshaya Tulskaya 52, Moscow, 115191, Russian Federation

This article provides a brief overview of the main global trends in applied research aimed at developing a next-generation optical time and frequency standard based on the anomalous low-lying isomeric state of the 229Th nucleus. The results of pioneering research are presented, focusing on the development of an original method for resonant excitation of 229Th nuclei by ultraviolet radiation emitted during the decay of exciton states in xenon and krypton cryocrystals.

Keywords: 229Th, nuclear isomeric transition, cryocrystals, Kr, two-photon excitation mechanism, laser generation
DOI: 10.3367/UFNe.2025.12.040103
Citation: Borisyuk P V, Myzin D A, Gubskiy K L, Didenko N V, Korneev P A, Kuznetsov A P, Lebedinskii Yu Yu, Nauryzbaev Ja M, Popruzhenko S V, Chubunova E V, Shilov V A, Tkalya E V "Two-photon laser generation of exciton states in krypton cryocrystals as a method for excitation of an anomalous low-energy isomeric nuclear state in the Thorium-229 isotope" Phys. Usp., accepted

17th, December 2025

Оригинал: Борисюк П В, Мызин Д А, Губский К Л, Диденко Н В, Корнеев Ф А, Кузнецов А П, Лебединский Ю Ю, Наурызбаев Жанибек Мухтар улы, Попруженко С В, Чубунова Е В, Шилов В А, Ткаля Е В «Двухфотонная лазерная генерация экситонных состояний в криокристаллах криптона как метод возбуждения аномального низкоэнергетического изомерного ядерного состояния в изотопе Тория-229» УФН, принята к публикации; DOI: 10.3367/UFNr.2025.12.040103

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