Channeling Effect and Improvement of the Efficiency of Charged Particle Registration With Crystal Scintillators

Drobyshevski, E. M.

doi:10.1142/s0217732308028430

Cited by 52 publications

(58 citation statements)

References 29 publications

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“…In Refs. [38,39] it has been pointed out that the socalled channeling effect could be relevant, implying that for a certain fraction of events no quenching would occur due to the special orientation of the recoil with respect to the crystal. So far this effect has not been confirmed experimentally in the relevant energy range.…”

Section: Event Ratesmentioning

confidence: 99%

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DAMA/LIBRA data and leptonically interacting dark matter

et al. 2009

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We consider the hypothesis that dark matter (DM) has tree-level interactions only with leptons. Such a framework, where DM recoils against electrons bound in atoms, has been proposed as an explanation for the annually modulated scintillation signal in DAMA/LIBRA data versus the absence of a signal for nuclear recoils in experiments like CDMS or XENON10. However, even in such a leptophilic DM scenario there are loop-induced DM-hadron interactions, where photons emitted from virtual leptons couple to the charge of a nucleus. Using a general effective field theory approach we show that, if such an interaction is induced at one-or two-loop level, then DM-nucleus scattering dominates over DM-electron scattering. This is because the latter is suppressed by the bound state wave function. One obtains a situation similar to standard DM-nucleus scattering analyses with considerable tension between the results of DAMA and CDMS/XENON10. This conclusion does not apply in the case of pseudoscalar or axialvector coupling between DM and leptons, where the loop diagrams vanish. In this case the explanation of the DAMA signal in terms of DM-electron scattering is strongly disfavored by the spectral shape of the signal. Furthermore, if DM can annihilate into neutrinos or tau leptons, the required cross sections are excluded by many orders of magnitude using the Super-Kamiokande bound on neutrinos from DM annihilations in the Sun.

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Section: Event Ratesmentioning

confidence: 99%

“…Details on how we calculate the matrix elements involving the wave function in Eq. (38) are given in Appendix C.…”

Section: B Wimp-atom Scatteringmentioning

confidence: 99%

DAMA/LIBRA data and leptonically interacting dark matter

et al. 2009

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“…by Drobyshevski [1] and subsequently by the DAMA collaboration [2] in 2007. In 2008, Avignone, Creswick, and Nussinov [3] suggested that a daily modulation due to channeling could occur in NaI crystals, which would be a background free dark matter signature.…”

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confidence: 99%

Daily modulation due to channeling in direct dark matter crystalline detectors

Bozorgnia¹,

Gelmini²,

Gondolo

2011

Phys. Rev. D

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The channeling of the ion recoiling after a collision with a WIMP in direct dark matter crystalline detectors produces a larger scintillation or ionization signal than otherwise expected. Channeling is a directional effect which depends on the velocity distribution of WIMPs in the dark halo of our Galaxy and could lead to a daily modulation of the signal. Here we compute upper bounds to the expected amplitude of daily modulation due to channeling using channeling fractions that we obtained with analytic models in prior work. After developing the general formalism, we examine the possibility of finding a daily modulation due to channeling in the data already collected by the DAMA/NaI and DAMA/LIBRA experiments. We find that even the largest daily modulation amplitudes (of the order of 10% in some instances) would not be observable for WIMPs in the standard halo in the 13 years of data taken by the DAMA collaboration. For these to be observable the DAMA total rate should be 1/40 of what it is or the total DAMA exposure should be 40 times larger. The daily modulation due to channeling will be difficult to measure in future experiments.

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“…[48] Most (∼ 97%) of DAMA's data are in the 3 − 6 keV range. If we identify these as the unchanneled sample then the true energies are ∼ 30−60 keV and channeling effects are much smaller.…”

Section: Dama/libra the Annual Modulations And Prospects Of Daimentioning

confidence: 99%

Some Aspects of New CDM Models and CDM Detection Methods

Nussinov

2009

Mod. Phys. Lett. A

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We briefly review some recent Cold Dark Matter (CDM) models. Our main focus are charge symmetric models of WIMPs which are not the standard SUSY LSP's (Lightest Supersymmetric Partners). We indicate which experiments are most sensitive to certain aspects of the models. In particular we discuss the manifestations of the new models in neutrino telescopes and other setups. We also discuss some direct detection experiments and comment on measuring the direction of recoil ions-which is correlated with the direction of the incoming WIMP. This could yield daily variations providing along with the annual modulation signatures for CDM.

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Channeling Effect and Improvement of the Efficiency of Charged Particle Registration With Crystal Scintillators

Cited by 52 publications

References 29 publications

DAMA/LIBRA data and leptonically interacting dark matter

DAMA/LIBRA data and leptonically interacting dark matter

Daily modulation due to channeling in direct dark matter crystalline detectors

Some Aspects of New CDM Models and CDM Detection Methods

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