| Autor: |
Joubioux, M. Le, Savajols, H., Mittig, W., Fléchard, X., Hayen, L., Penionzhkevich, Yu. E., Ackermann, D., Borcea, C., Caceres, L., Delahaye, P., Didierjean, F., Franchoo, S., Grillet, A., Jacquot, B., Lebois, M., Ledoux, X., Lecesne, N., Liénard, E., Lukyanov, S., Naviliat-Cuncic, O., Piot, J., Singh, A., Smirnov, V., Stodel, C., Testov, D., Thomas, J. C., Verney, D. |
| Rok vydání: |
2023 |
| Předmět: |
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| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevLett.132.132501 |
| Popis: |
Neutron dark decays have been suggested as a solution to the discrepancy between bottle and beam experiments, providing a dark matter candidate that can be searched for in halo nuclei. The free neutron in the final state following the decay of $^6$He into $^4$He $+$ $n$ + $\chi$ provides an exceptionally clean detection signature when combined with a high efficiency neutron detector. Using a high-intensity $^6$He$^+$ beam at GANIL, a search for a coincident neutron signal resulted in an upper limit on a dark decay branching ratio of Br$_\chi \leq 4.0\times10^{-10}$ (95\% C.L.). Using the dark neutron decay model proposed originally by Fornal and Grinstein, we translate this into an upper bound on a dark neutron branching ratio of $\mathcal{O}(10^{-5})$, improving over global constraints by one to several orders of magnitude depending on $m_\chi$. |
| Databáze: |
arXiv |
| Externí odkaz: |
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