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

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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 languageEnglish (US)
Article number015807
JournalPhysical Review C - Nuclear Physics
Volume92
Issue number1
DOIs
StatePublished - Jul 30 2015

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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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), [015807]. https://doi.org/10.1103/PhysRevC.92.015807