| Issue |
EPL
Volume 151, Number 1, July 2025
|
|
|---|---|---|
| Article Number | 14002 | |
| Number of page(s) | 5 | |
| Section | Nuclear and plasma physics, particles and fields | |
| DOI | https://doi.org/10.1209/0295-5075/ade561 | |
| Published online | 16 July 2025 | |
Search for the inelastic scattering of dark matter massive particles on the 
Hf isomer
1 Institute for Nuclear Research - Nauky Av. 47, 03028 Kyiv, Ukraine
2 Institute of Physiology, University Medical Center of the Johannes Gutenberg University - Duesbergweg 6, 55128 Mainz, Germany
Received: 27 January 2025
Accepted: 17 June 2025
The results of the new experimental search for dark matter using the 
isomer are presented. The γ-rays that are not emitted during the spontaneous decay of this isomer but might arise from the population of excited nuclear levels in 178Hf due to the inelastic scattering with dark matter massive particles are analyzed in detail. The limits on the half-life of the dark-matter–induced transitions, obtained from limits on these γ-ray intensities, have been improved by about 55 times, from 1.79 × 105 y to 
105 y. Further progress of such experimental efforts is discussed.
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