Scintillation efficiency measurement of Na recoils in NaI(Tl) below the DAMA/LIBRA energy threshold

Jingke Xu; Emily Shields; Frank Calaprice; Shawn Westerdale; Francis Froborg; Burkhant Suerfu; Thomas Alexander; Ani Aprahamian; Henning O. Back; Clark Casarella; Xiao Fang; Yogesh K. Gupta; Aldo Ianni; Edward Lamere; W. Hugh Lippincott; Qian Liu; Stephanie Lyons; Kevin Siegl; Mallory Smith; Wanpeng Tan; Bryant Vande Kolk

doi:10.1103/PhysRevC.92.015807

Scintillation efficiency measurement of Na recoils in NaI(Tl) below the DAMA/LIBRA energy threshold

Jingke Xu, Emily Shields, Frank Calaprice, Shawn Westerdale, Francis Froborg, Burkhant Suerfu, Thomas Alexander, Ani Aprahamian, Henning O. Back, Clark Casarella, Xiao Fang, Yogesh K. Gupta, Aldo Ianni, Edward Lamere, W. Hugh Lippincott, Qian Liu, Stephanie Lyons, Kevin Siegl, Mallory Smith, Wanpeng TanBryant Vande Kolk

Physics

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Abstract

The dark matter interpretation of the DAMA modulation signal depends on the NaI(Tl) scintillation efficiency of nuclear recoils. Previous measurements for Na recoils have large discrepancies, especially in the DAMA/LIBRA modulation energy region. We report a quenching effect measurement of Na recoils in NaI(Tl) from 3 to 52 keVnr, covering the whole DAMA/LIBRA energy region for dark matter-Na scattering interpretations. By using a low-energy, pulsed neutron beam, a double time-of-flight technique, and pulse-shape discrimination methods, we obtained the most accurate measurement of this kind for NaI(Tl) to date. The results differ significantly from the DAMA reported values at low energies but fall between the other previous measurements. We present the implications of the new quenching results for the dark matter interpretation of the DAMA modulation signal.

Original language	English (US)
Article number	015807
Journal	Physical Review C - Nuclear Physics
Volume	92
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevC.92.015807
State	Published - Jul 30 2015

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

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10.1103/PhysRevC.92.015807

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Xu, J., Shields, E., Calaprice, F., Westerdale, S., Froborg, F., Suerfu, B., Alexander, T., Aprahamian, A., Back, H. O., Casarella, C., Fang, X., Gupta, Y. K., Ianni, A., Lamere, E., Lippincott, W. H., Liu, Q., Lyons, S., Siegl, K., Smith, M., ... Kolk, B. V. (2015). Scintillation efficiency measurement of Na recoils in NaI(Tl) below the DAMA/LIBRA energy threshold. Physical Review C - Nuclear Physics, 92(1), Article 015807. https://doi.org/10.1103/PhysRevC.92.015807

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title = "Scintillation efficiency measurement of Na recoils in NaI(Tl) below the DAMA/LIBRA energy threshold",

abstract = "The dark matter interpretation of the DAMA modulation signal depends on the NaI(Tl) scintillation efficiency of nuclear recoils. Previous measurements for Na recoils have large discrepancies, especially in the DAMA/LIBRA modulation energy region. We report a quenching effect measurement of Na recoils in NaI(Tl) from 3 to 52 keVnr, covering the whole DAMA/LIBRA energy region for dark matter-Na scattering interpretations. By using a low-energy, pulsed neutron beam, a double time-of-flight technique, and pulse-shape discrimination methods, we obtained the most accurate measurement of this kind for NaI(Tl) to date. The results differ significantly from the DAMA reported values at low energies but fall between the other previous measurements. We present the implications of the new quenching results for the dark matter interpretation of the DAMA modulation signal.",

author = "Jingke Xu and Emily Shields and Frank Calaprice and Shawn Westerdale and Francis Froborg and Burkhant Suerfu and Thomas Alexander and Ani Aprahamian and Back, {Henning O.} and Clark Casarella and Xiao Fang and Gupta, {Yogesh K.} and Aldo Ianni and Edward Lamere and Lippincott, {W. Hugh} and Qian Liu and Stephanie Lyons and Kevin Siegl and Mallory Smith and Wanpeng Tan and Kolk, {Bryant Vande}",

note = "Publisher Copyright: {\textcopyright} 2015 American Physical Society. {\textcopyright}2015 American Physical Society.",

year = "2015",

month = jul,

day = "30",

doi = "10.1103/PhysRevC.92.015807",

language = "English (US)",

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Xu, J, Shields, E, Calaprice, F, Westerdale, S, Froborg, F, Suerfu, B, Alexander, T, Aprahamian, A, Back, HO, Casarella, C, Fang, X, Gupta, YK, Ianni, A, Lamere, E, Lippincott, WH, Liu, Q, Lyons, S, Siegl, K, Smith, M, Tan, W & Kolk, BV 2015, 'Scintillation efficiency measurement of Na recoils in NaI(Tl) below the DAMA/LIBRA energy threshold', Physical Review C - Nuclear Physics, vol. 92, no. 1, 015807. https://doi.org/10.1103/PhysRevC.92.015807

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T1 - Scintillation efficiency measurement of Na recoils in NaI(Tl) below the DAMA/LIBRA energy threshold

AU - Xu, Jingke

AU - Shields, Emily

AU - Calaprice, Frank

AU - Westerdale, Shawn

AU - Froborg, Francis

AU - Suerfu, Burkhant

AU - Alexander, Thomas

AU - Aprahamian, Ani

AU - Back, Henning O.

AU - Casarella, Clark

AU - Fang, Xiao

AU - Gupta, Yogesh K.

AU - Ianni, Aldo

AU - Lamere, Edward

AU - Lippincott, W. Hugh

AU - Liu, Qian

AU - Lyons, Stephanie

AU - Siegl, Kevin

AU - Smith, Mallory

AU - Tan, Wanpeng

AU - Kolk, Bryant Vande

PY - 2015/7/30

Y1 - 2015/7/30

N2 - The dark matter interpretation of the DAMA modulation signal depends on the NaI(Tl) scintillation efficiency of nuclear recoils. Previous measurements for Na recoils have large discrepancies, especially in the DAMA/LIBRA modulation energy region. We report a quenching effect measurement of Na recoils in NaI(Tl) from 3 to 52 keVnr, covering the whole DAMA/LIBRA energy region for dark matter-Na scattering interpretations. By using a low-energy, pulsed neutron beam, a double time-of-flight technique, and pulse-shape discrimination methods, we obtained the most accurate measurement of this kind for NaI(Tl) to date. The results differ significantly from the DAMA reported values at low energies but fall between the other previous measurements. We present the implications of the new quenching results for the dark matter interpretation of the DAMA modulation signal.

AB - The dark matter interpretation of the DAMA modulation signal depends on the NaI(Tl) scintillation efficiency of nuclear recoils. Previous measurements for Na recoils have large discrepancies, especially in the DAMA/LIBRA modulation energy region. We report a quenching effect measurement of Na recoils in NaI(Tl) from 3 to 52 keVnr, covering the whole DAMA/LIBRA energy region for dark matter-Na scattering interpretations. By using a low-energy, pulsed neutron beam, a double time-of-flight technique, and pulse-shape discrimination methods, we obtained the most accurate measurement of this kind for NaI(Tl) to date. The results differ significantly from the DAMA reported values at low energies but fall between the other previous measurements. We present the implications of the new quenching results for the dark matter interpretation of the DAMA modulation signal.

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Scintillation efficiency measurement of Na recoils in NaI(Tl) below the DAMA/LIBRA energy threshold

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