Results from a Search for Light-Mass Dark Matter with a p-Type Point Contact Germanium Detector

被引：659

作者：

Aalseth, C. E. ^{[1
]}

Barbeau, P. S. ^{[2
,3
]}

Bowden, N. S. ^{[4
]}

Cabrera-Palmer, B. ^{[5
]}

Colaresi, J. ^{[6
]}

Collar, J. I. ^{[2
,3
]}

Dazeley, S. ^{[4
]}

de Lurgio, P. ^{[7
]}

Fast, J. E. ^{[1
]}

Fields, N. ^{[2
,3
]}

Greenberg, C. H. ^{[2
,3
]}

Hossbach, T. W. ^{[1
,2
,3
]}

Keillor, M. E. ^{[1
]}

Kephart, J. D. ^{[1
]}

Marino, M. G. ^{[8
,9
]}

Miley, H. S. ^{[1
]}

Miller, M. L. ^{[8
,9
]}

Orrell, J. L. ^{[1
]}

Radford, D. C. ^{[10
]}

Reyna, D. ^{[5
]}

Tench, O. ^{[6
]}

Van Wechel, T. D. ^{[8
,9
]}

Wilkerson, J. F. ^{[8
,9
,11
]}

Yocum, K. M. ^{[6
]}

机构：

[1] Pacific NW Natl Lab, Richland, WA 99352 USA

[2] Univ Chicago, Kavli Inst Cosmol Phys, Chicago, IL 60637 USA

[3] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA

[4] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[5] Sandia Natl Labs, Livermore, CA 94550 USA

[6] CANBERRA Ind, Meriden, CT 06450 USA

[7] Argonne Natl Lab, Argonne, IL 60439 USA

[8] Univ Washington, Ctr Expt Nucl Phys & Astrophys, Seattle, WA 98195 USA

[9] Univ Washington, Dept Phys, Seattle, WA 98195 USA

[10] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[11] Univ N Carolina, Dept Phys & Astron, Chapel Hill, NC 27599 USA

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 13期

关键词：

Galaxies; -; Germanium;

D O I：

10.1103/PhysRevLett.106.131301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on several features in the energy spectrum from an ultralow-noise germanium detector operated deep underground. By implementing a new technique able to reject surface events, a number of cosmogenic peaks can be observed for the first time. We discuss an irreducible excess of bulklike events below 3 keV in ionization energy. These could be caused by unknown backgrounds, but also dark matter interactions consistent with DAMA/LIBRA. It is not yet possible to determine their origin. Improved constraints are placed on a cosmological origin for the DAMA/LIBRA effect.

引用

页数：4