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Article Dans Une Revue Physical Review Letters Année : 2024

Is there a dark decay of neutrons in $^6$He ?

H. Savajols
L. Hayen
D. Testov
  • Fonction : Auteur

Résumé

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 6He into 4He+n+χ provides an exceptionally clean detection signature when combined with a high efficiency neutron detector. Using a high-intensity 6He+ beam at Grand Accélérateur National d’Ions Lourds, a search for a coincident neutron signal resulted in an upper limit on a dark decay branching ratio of Brχ≤4.0×10−10 (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 O(10−5), improving over global constraints by one to several orders of magnitude depending on mχ.
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Dates et versions

hal-04527177 , version 1 (29-04-2024)

Identifiants

Citer

M. Le Joubioux, H. Savajols, W. Mittig, X. Fléchard, L. Hayen, et al.. Is there a dark decay of neutrons in $^6$He ?. Physical Review Letters, 2024, 132 (13), pp.132501. ⟨10.1103/PhysRevLett.132.132501⟩. ⟨hal-04527177⟩
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