Measurement of Ionization Produced by 254 eVnr Nuclear Recoils in Germanium
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arXiv
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866913513312616448 |
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| author | Kavner, A. R. L. Jovanovic, I. |
| author_facet | Kavner, A. R. L. Jovanovic, I. |
| contents | Ionization produced by low-energy nuclear recoils is among the primary direct signatures of dark matter interactions. Despite the urgency of dark matter detection and the recent measurements of coherent elastic neutrino-nucleus scattering, detector response to nuclear recoils is not well characterized in the keVnr and sub-keVnr regime across a variety of materials. We have re-performed a measurement of the ionization produced by monoenergetic 254 eVnr nuclear recoils in Ge with improved digital electronics and additional systematic studies. Our results indicate an ionization yield of 64 +/- 8 eVee corresponding to a quenching factor of 25 +/- 3%, greater than the 14% predicted by the Lindhard model. This ionization enhancement could greatly improve the sensitivity of high-purity Ge detectors in dark matter detection and measurement of neutrinos via coherent scattering. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_10405 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Measurement of Ionization Produced by 254 eVnr Nuclear Recoils in Germanium Kavner, A. R. L. Jovanovic, I. Nuclear Experiment Instrumentation and Detectors Ionization produced by low-energy nuclear recoils is among the primary direct signatures of dark matter interactions. Despite the urgency of dark matter detection and the recent measurements of coherent elastic neutrino-nucleus scattering, detector response to nuclear recoils is not well characterized in the keVnr and sub-keVnr regime across a variety of materials. We have re-performed a measurement of the ionization produced by monoenergetic 254 eVnr nuclear recoils in Ge with improved digital electronics and additional systematic studies. Our results indicate an ionization yield of 64 +/- 8 eVee corresponding to a quenching factor of 25 +/- 3%, greater than the 14% predicted by the Lindhard model. This ionization enhancement could greatly improve the sensitivity of high-purity Ge detectors in dark matter detection and measurement of neutrinos via coherent scattering. |
| title | Measurement of Ionization Produced by 254 eVnr Nuclear Recoils in Germanium |
| topic | Nuclear Experiment Instrumentation and Detectors |
| url | https://arxiv.org/abs/2405.10405 |