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Title: Ionization yield from nuclear recoils in liquid-xenon dark matter detection

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Journal Article: Publisher's Accepted Manuscript
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Astroparticle Physics
Additional Journal Information:
Journal Volume: 62; Journal Issue: C; Related Information: CHORUS Timestamp: 2016-09-04 17:03:49; Journal ID: ISSN 0927-6505
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Citation Formats

Mu, Wei, and Ji, Xiangdong. Ionization yield from nuclear recoils in liquid-xenon dark matter detection. Netherlands: N. p., 2015. Web. doi:10.1016/j.astropartphys.2014.07.013.
Mu, Wei, & Ji, Xiangdong. Ionization yield from nuclear recoils in liquid-xenon dark matter detection. Netherlands. doi:10.1016/j.astropartphys.2014.07.013.
Mu, Wei, and Ji, Xiangdong. 2015. "Ionization yield from nuclear recoils in liquid-xenon dark matter detection". Netherlands. doi:10.1016/j.astropartphys.2014.07.013.
title = {Ionization yield from nuclear recoils in liquid-xenon dark matter detection},
author = {Mu, Wei and Ji, Xiangdong},
abstractNote = {},
doi = {10.1016/j.astropartphys.2014.07.013},
journal = {Astroparticle Physics},
number = C,
volume = 62,
place = {Netherlands},
year = 2015,
month = 3

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Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.astropartphys.2014.07.013

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Cited by: 3works
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  • We report the first measurements of the absolute ionization yield of nuclear recoils in liquid xenon, as a function of energy and electric field. Independent experiments were carried out with two dual-phase time-projection chamber prototypes, developed for the XENON dark matter project. We find that the charge yield increases with decreasing recoil energy, and exhibits only a weak field dependence. These results are the first unambiguous demonstration of the capability of dual-phase xenon detectors to discriminate between electron and nuclear recoils down to 20 keV, a key requirement for a sensitive dark matter search.
  • Liquid xenon (LXe) is an excellent material for experiments designed to detect dark matter in the form of weakly interacting massive particles (WIMPs). A low energy detection threshold is essential for a sensitive WIMP search. The understanding of the relative scintillation efficiency (L{sub eff}) and ionization yield of low energy nuclear recoils in LXe is limited for energies below 10 keV. In this article, we present new measurements that extend the energy down to 4 keV, finding that L{sub eff} decreases with decreasing energy. We also measure the quenching of scintillation efficiency caused by the electric field in LXe, findingmore » no significant field dependence.« less
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  • We have measured the scintillation and ionization yield of recoiling nuclei in liquid argon as a function of applied electric field by exposing a dual-phase liquid argon time projection chamber (LAr-TPC) to a low energy pulsed narrow band neutron beam produced at the Notre Dame Institute for Structure and Nuclear Astrophysics. Liquid scintillation counters were arranged to detect and identify neutrons scattered in the TPC and to select the energy of the recoiling nuclei. We also report measurements of the scintillation yields for nuclear recoils with energies from 10.3 to 57.3 keV and for median applied electric fields from 0more » to 970 V/cm. For the ionization yields, we report measurements from 16.9 to 57.3 keV and for electric fields from 96.4 to 486 V/cm. Furthermore, we report the observation of an anticorrelation between scintillation and ionization from nuclear recoils, which is similar to the anticorrelation between scintillation and ionization from electron recoils. Assuming that the energy loss partitions into excitons and ion pairs from 83mKr internal conversion electrons is comparable to that from 207Bi conversion electrons, we obtained the numbers of excitons (N ex) and ion pairs (N i) and their ratio (N ex/N i) produced by nuclear recoils from 16.9 to 57.3 keV. Motivated by arguments suggesting direction sensitivity in LAr-TPC signals due to columnar recombination, a comparison of the light and charge yield of recoils parallel and perpendicular to the applied electric field is presented for the first time.« less