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

Petr Victorovich Borisyuk; Dmitrii Anatol’evich Myzin; Konstantin Leonidovich Gubskiy; Nikita Vladimirovich Didenko; Philipp Aleksandrovich Korneev; Andrei Petrovich Kuznetsov; Yurii Yur’evich Lebedinskii; Janibek M. Nauryzbaev; Sergei Vasil’evich Popruzhenko; Elena Vital’evna Chubunova; Valentin Aleksandrovich Shilov; Evgenii V. Tkalya

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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

P.V. Borisyuk^†^a, D.A. Myzin^‡^a, K.L. Gubskiy^a, N.V. Didenko^b, P.A. Korneev^a, A.P. Kuznetsov^a, Yu.Yu. Lebedinskii^a, c, Ja.M. Nauryzbaev^a, S.V. Popruzhenko^a, E.V. Chubunova^a, V.A. Shilov^a, E.V. Tkalya^a, d, e
^aNational Research Nuclear University ‘MEPhI’, Kashirskoe shosse 31, Moscow, 115409, Russian Federation
^bAvesta Project Ltd., Fizicheskaya Street 11, Troitsk, Moscow, 108840, Russian Federation
^cMoscow Institute of Physics and Technology (National Research University), Institutskii per. 9, Dolgoprudny, Moscow Region, 141700, Russian Federation
^dLebedev Physical Institute, Russian Academy of Sciences, Leninsky prosp. 53, Moscow, 119991, Russian Federation
^eNuclear 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.

Typically, an English full text is available in about 1 month from the date of publication of the original article.

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Keywords: ²²⁹Th, nuclear isomeric transition, cryocrystals, Kr, two-photon excitation mechanism, laser generation
PACS: 06.30.Ft, 23.20.Lv, 71.35.−y (all)
DOI: 10.3367/UFNe.2025.12.040103
URL: https://ufn.ru/en/articles/2026/10/e/
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. 69 (10) (2026)

Received: 17th, February 2026, 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 Ж М у, 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 196 1077–1085 (2026); DOI: 10.3367/UFNr.2025.12.040103