Search for an annual modulation of dark-matter signals with a germanium spectrometer at the Sierra Grande Laboratory

Abriola, D.; Avignone, F.T.; Brodzinski, R. L.; Collar, J. I.; Gregorio, D.E. Di; Farach, Horácio A.; Garcı́a, E.; Gattone, A.O.; Guérard, C.; Hasenbalg, F.; Huck, H.; Miley, H.S.; Morales, A.; Morales, J.; Solórzano, A. Ortíz de; Puimedón, J.; Reeves, J.H.; Salinas, A.; Sarsa, M.L.; Villar, J.A.

doi:10.1016/s0927-6505(98)00047-4

Cited by 29 publications

(13 citation statements)

References 35 publications

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“…Some special features of the WIMP interaction can be exploited to reduce the background problems, such as the modulation effect: this yields a periodic signal due to the motion of the Earth around the Sun. Unfortunately this effect, also proposed a long time ago [22] and subsequently studied by many authors [19,[23][24][25][26][27][28][29][30][31], is small in the case of nuclear recoils, but we expect it to be a bit larger in the case of the electron recoils. There has always been an interest in light WIMPs, see, for example, the recent work [32].…”

Section: Introductionmentioning

confidence: 60%

Light WIMP Searches Involving Electron Scattering

Vergados

Moustakidis

Cheung

et al. 2018

Advances in High Energy Physics

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In the present work we examine the possibility of detecting electrons in light dark matter searches. These detectors are considered to be the most appropriate for detecting dark matter particles with a mass in the MeV region. We analyze theoretically some key issues involved in such detection. More specifically we consider a particle model involving WIMPs interacting with fermions via -exchange. We find that for WIMPs with mass in the electron mass range the cross section for WIMP-atomic electron scattering is affected by the electron binding. For WIMPs more than 20 times heavier than the electron, the binding affects the kinematics very little. As a result, many electrons can be ejected with energy which increases linearly with the WIMP mass, but the cross section is somewhat reduced depending on the bound state wave function employed. On the other hand for lighter WIMPs, the effect of binding is dramatic. More specifically at most 10 electrons, namely, those with binding energy below 10 eV, become available even in the case of WIMPs with a mass as large as 20 times the electron mass. Even fewer electrons contribute if the WIMPs are lighter. The cross section is, however, substantially enhanced by the Fermi function corrections, which become more important at low energies of the outgoing electrons. Thus events of 0.5-2.5 per kg-y become possible.

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Section: Introductionmentioning

confidence: 60%

Light WIMP Searches Involving Electron Scattering

Vergados

Moustakidis

Cheung

et al. 2018

Advances in High Energy Physics

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“…An alternative way of achieving the same suppression of the cosmogenic lines is to use enriched germanium as done by the Heidelberg/Moscow experiment [13]. The Sierra Grande curve in figure 7 is from a long exposure germanium experiment in which a search for both daily and annual modulation has been performed [1, 2], and the results from the daily modulation search are shown in figure 8. No significant signals are seen.…”

Section: Neutralino Detection Principles and Techniquesmentioning

confidence: 99%

Experimental Searches for Dark Matter

Sumner

2002

Living Rev. Relativ.

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There is now an enormously rich variety of experimental techniques being brought to bear on experimental searches for dark matter, covering a wide range of suggested forms for it. The existence of “dark matter”, in some form or other, is inferred from a number of relatively simple observations and the problem has been known for over half a century. To explain “dark matter” is one of the foremost challenges today — the answer will be of fundamental importance to cosmologists, astrophysicists, particle physicists, and general relativists. In this article, I will give a brief review of the observational evidence (concentrating on areas of current significant activity), followed by anequally brief summary of candidate solutions for the ‘dark matter’. I will then discuss experimental searches, both direct and indirect. Finally, I will offer prospects for the future.

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“…Several experiments have already searched for this effect [2][3][4] one of which [5] reports a possible positive signal. The present situation is no doubt exciting, since experimental sensitivities of underground detectors are entering for the first time the supersymmetric parameter space, and a host of new experiments will soon start to probe it with even higher sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity plots for WIMP direct detection using the annual modulation signature

Cebrián

Garcı́a

González

et al. 2001

Astroparticle Physics

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Annual modulation due to the Earth's motion around the Sun is a well known signature of the expected WIMP signal induced in a solid state underground detector. In the present letter we discuss the prospects of this technique on statistical grounds, introducing annual-modulation sensitivity plots for the WIMP-nucleon scalar cross section for different materials and experimental conditions. The highest sensitivity to modulation is found in the WIMP mass interval 10 GeV < ∼ m W < ∼ 130 GeV, the actual upper limit depending from the choice of the astrophysical parameters, while the lowest values of the explorable WIMP-nucleon elastic cross-sections fall in most cases within one order of magnitude of the sensitivities of present direct detection WIMP searches.

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Search for an annual modulation of dark-matter signals with a germanium spectrometer at the Sierra Grande Laboratory

Abstract: Results of a search for dark-matter induced annual modulation using 830.5 kg·days of data collected at the Sierra Grande underground laboratory with a germanium detector are presented. The analysis of the data does not show any indication of seasonal effects. 95.35.+d, 14.60.st

Cited by 29 publications

References 35 publications

Light WIMP Searches Involving Electron Scattering

Light WIMP Searches Involving Electron Scattering

Experimental Searches for Dark Matter

Sensitivity plots for WIMP direct detection using the annual modulation signature

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