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Phys Rev Lett ; 130(21): 211802, 2023 May 26.
Artigo em Inglês | MEDLINE | ID: mdl-37295094

RESUMO

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.


Assuntos
Núcleo Celular , Nêutrons , Califórnio , Método de Monte Carlo
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