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Physics Letters

The effect of chemical state on the decay constant of a nuclear isomer, 235mU

Sakae Shimizu, Hiromasa Mazaki

Published Jul 1, 1965• 19 citations
Publisher
DOI
10.1016/0031-9163(65)90529-9

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The Th-229 nuclear isomeric state has the lowest energy of all known nuclear excited states, placing it within the reach of current table-top laser technology. This extraordinary property has made this nuclear isomer an attractive candidate for a nuclear optical clock of incredibly high precision and accuracy, both as isolated trapped Th-229 ions and embedded into solid-state platforms. Activity around Th-229 has surged in recent years, driven by breakthroughs in its direct laser excitation. The underlying nuclear physics that gives rise to this unique isomer will be elucidated, as well as the nearly half-century of efforts that led to its direct excitation. The design and systematics of a Th-229 nuclear clock will be discussed, both in ion traps and in the solid-state. These systematics, such as frequency shifts and quenching channels, can be leveraged both to probe the local chemical environment, and as a control knob during clock operation. Finally, the nuclear clock's high sensitivity to the variations of fundamental constants will be discussed.

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Conceptual Design of an X-ray-Centric Nuclear Isomer Computing Architecture and Its Integration with All-Photonics Networks

sakaguchi noriaki

This project presents the conceptual design of an X-ray-Centric Nuclear Isomer Computing Architecture, a next-generation computing paradigm that shifts information storage and processing from electron orbitals to nuclear isomer states. The architecture integrates nuclear physics, solid-state physics, X-ray optics, and photonic communication technologies to achieve ultra-high information density, centralized processor-less computing, and seamless integration with All-Photonics Networks (APN). This repository contains the preprint, supporting materials, and future revisions of the proposed architecture.

•Jan 1, 2026•0 citations
The Th-229 nuclear isomeric state has the lowest energy of all known nuclear excited states, placing it within the reach of current table-top laser technology. This extraordinary property has made this nuclear isomer an attractive candidate for a nuclear optical clock of incredibly high precision and accuracy, both as isolated trapped Th-229 ions and embedded into solid-state platforms. Activity around Th-229 has surged in recent years, driven by breakthroughs in its direct laser excitation. The underlying nuclear physics that gives rise to this unique isomer will be elucidated, as well as the nearly half-century of efforts that led to its direct excitation. The design and systematics of a Th-229 nuclear clock will be discussed, both in ion traps and in the solid-state. These systematics, such as frequency shifts and quenching channels, can be leveraged both to probe the local chemical environment, and as a control knob during clock operation. Finally, the nuclear clock's high sensitivity to the variations of fundamental constants will be discussed.
Abstract Mutiple experimental results indicate the existence of cosmophysical effects which influence parameters of nuclear decays and chemical reactions in lab. conditions. In particular, variations of nucleus decay parameters are detected which amplitudes are of the order 10−3 and periods of one year, 24 hours or about one month. Similar influence of solar activity on nuclear decays and chemical reactions also was reported. We argue that such deviations from radioactive decay law and other similar effects can be described by novel quantum nonlocality mechanism, different from standard EPR-Bohm nonlocality. Modified Doebner-Goldin model applied for the description of dynamical nonlocal effects concerned with nuclear decays.
This project presents the conceptual design of an X-ray-Centric Nuclear Isomer Computing Architecture, a next-generation computing paradigm that shifts information storage and processing from electron orbitals to nuclear isomer states. The architecture integrates nuclear physics, solid-state physics, X-ray optics, and photonic communication technologies to achieve ultra-high information density, centralized processor-less computing, and seamless integration with All-Photonics Networks (APN). This repository contains the preprint, supporting materials, and future revisions of the proposed architecture.