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. 2023 May 26;130(21):211802.
doi: 10.1103/PhysRevLett.130.211802.

Observation of a Nuclear Recoil Peak at the 100 eV Scale Induced by Neutron Capture

H Abele  1 , G Angloher  2 , A Bento  2   3 , L Canonica  2 , F Cappella  4 , L Cardani  4 , N Casali  4 , R Cerulli  5   6 , A Chalil  7 , A Chebboubi  8 , I Colantoni  4   9 , J-P Crocombette  10 , A Cruciani  4 , G Del Castello  4   11 , M Del Gallo Roccagiovine  4   11 , D Desforge  7 , A Doblhammer  1 , E Dumonteil  7 , S Dorer  1 , A Erhart  12 , A Fuss  1   13 , M Friedl  13 , A Garai  2 , V M Ghete  13 , A Giuliani  14 , C Goupy  7 , F Gunsing  7 , D Hauff  2 , F Jeanneau  7 , E Jericha  1 , M Kaznacheeva  12 , A Kinast  12 , H Kluck  13 , A Langenkämper  2 , T Lasserre  7   12 , A Letourneau  7 , D Lhuillier  7 , O Litaize  8 , M Mancuso  2 , P de Marcillac  14 , S Marnieros  14 , T Materna  7 , B Mauri  7 , A Mazzolari  15 , E Mazzucato  7 , H Neyrial  7 , C Nones  7 , L Oberauer  12 , T Ortmann  12 , A Ouzriat  7 , L Pattavina  12   16 , L Peters  12 , F Petricca  2 , D V Poda  14 , W Potzel  12 , F Pröbst  2 , F Reindl  1   13 , R Rogly  7 , M Romagnoni  15 , J Rothe  12 , N Schermer  12 , J Schieck  1   13 , S Schönert  12 , C Schwertner  1   13 , L Scola  7 , O Serot  8 , G Soum-Sidikov  7 , L Stodolsky  2 , R Strauss  12 , M Tamisari  15   17 , L Thulliez  7 , C Tomei  4 , M Vignati  4   11 , M Vivier  7 , V Wagner  12 , A Wex  12 ; CRAB Collaboration; NUCLEUS Collaboration
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Free article

Observation of a Nuclear Recoil Peak at the 100 eV Scale Induced by Neutron Capture

H Abele et al. Phys Rev Lett. .
Free article

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.

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