Search for a neutron dark decay in $^6$He

Fuente: arXiv

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Bibliographic Details
Main Authors:	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.
Format:	Preprint
Published:	2023
Subjects:	Nuclear Experiment
Online Access:	Acceder al recurso
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_version_	1866929306942308352
author	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.
author_facet	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.
contents	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 $+$ $n$ + $χ$ 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$_χ\leq 4.0\times10^{-10}$ (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 $m_χ$.
format	Preprint
id	arxiv_https___arxiv_org_abs_2308_16536
institution	arXiv
publishDate	2023
record_format	arxiv
spellingShingle	Search for a neutron dark decay in $^6$He 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. Nuclear Experiment 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 $+$ $n$ + $χ$ 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$_χ\leq 4.0\times10^{-10}$ (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 $m_χ$.
title	Search for a neutron dark decay in $^6$He
topic	Nuclear Experiment
url	https://arxiv.org/abs/2308.16536