Effect of thallium impurities in the DAMA experiment on the allowed parameter space for inelastic dark matter

Spencer Chang, Rafael F. Lang, Neal Weiner

    Research output: Contribution to journalArticle

    Abstract

    The inelastic dark matter scenario was proposed to reconcile the DAMA annual modulation with null results from other experiments. In this scenario, weakly interacting massive particles (WIMPs) scatter into an excited state, split from the ground state by an energy δ comparable to the available kinetic energy of a galactic WIMP. We note that for large splittings δ the dominant scattering at DAMA can occur off of thallium nuclei, with A∼205, which are present as a dopant at the 10⊃-3 level in NaI(Tl) crystals. For a WIMP mass mX≈ 100GeV/c2 and δ≈200keV, we find a region in δ-mχ-parameter space which is consistent with all experiments. These parameters, in particular, can be probed in experiments with thallium in their targets, such as KIMS, but are inaccessible to lighter target experiments. Depending on the tail of the WIMP velocity distribution, a highly modulated signal may or may not appear at CRESST-II.

    Original languageEnglish (US)
    Article number011301
    JournalPhysical Review Letters
    Volume106
    Issue number1
    DOIs
    StatePublished - Jan 5 2011

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    demand assignment multiple access
    weakly interacting massive particles
    thallium
    dark matter
    impurities
    particle mass
    velocity distribution
    kinetic energy
    modulation
    nuclei
    ground state
    scattering
    excitation
    crystals
    energy

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

    Cite this

    Effect of thallium impurities in the DAMA experiment on the allowed parameter space for inelastic dark matter. / Chang, Spencer; Lang, Rafael F.; Weiner, Neal.

    In: Physical Review Letters, Vol. 106, No. 1, 011301, 05.01.2011.

    Research output: Contribution to journalArticle

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