Coherent elastic neutrino-nucleus scattering and low-mass dark matter detectors rely crucially on the understanding of their response to nuclear recoils. We report the first observation of a nuclear recoil peak at around 112 eV induced by neutron capture. The measurement was performed with a CaWO_{4} cryogenic detector from the NUCLEUS experiment exposed to a ^{252}Cf source placed in a compact moderator. We identify the expected peak structure from the single-γ de-excitation of ^{183}W with 3σ and its origin by neutron capture with 6σ significance. This result demonstrates a new method for precise, in situ, and nonintrusive calibration of low-threshold experiments.
Observation of a nuclear recoil peak at the 100 eV scale induced by neutron capture / Abele, H., Angloher, G., Bento, A., Canonica, L., Cappella, F., Cardani, L., Casali, N., Cerulli, R., Chalil, A., Chebboubi, A., Colantoni, I., Crocombette, J., Cruciani, A., Del Castello, G., Del Gallo Roccagiovine, M., Desforge, D., Doblhammer, A., Dumonteil, E., Dorer, S., Erhart, A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 130:21(2023), pp. 1-6. [10.1103/PhysRevLett.130.211802]
Observation of a nuclear recoil peak at the 100 eV scale induced by neutron capture
Cappella, F;Cardani, L;Casali, N;Colantoni, I;Cruciani, A;Del Castello, G;Del Gallo Roccagiovine, M;Vignati, M;
2023
Abstract
Coherent elastic neutrino-nucleus scattering and low-mass dark matter detectors rely crucially on the understanding of their response to nuclear recoils. We report the first observation of a nuclear recoil peak at around 112 eV induced by neutron capture. The measurement was performed with a CaWO_{4} cryogenic detector from the NUCLEUS experiment exposed to a ^{252}Cf source placed in a compact moderator. We identify the expected peak structure from the single-γ de-excitation of ^{183}W with 3σ and its origin by neutron capture with 6σ significance. This result demonstrates a new method for precise, in situ, and nonintrusive calibration of low-threshold experiments.| File | Dimensione | Formato | |
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