Improved spin-dependent limits from the PICASSO dark matter search experiment

被引：75

作者：

Barnabé-Heider, M

Di Marco, M

Doane, P

Genest, MH

Gornea, R

Guénette, R

Leroy, C

Lessard, L

Martin, JP

Wichoski, U

Zacek, V

Clark, K

Krauss, C

Noble, A

Behnke, E

Feighery, W

Levine, I

Muthusi, C

Kanagalingam, S

Noulty, R

机构：

[1] Univ Montreal, Dept Phys, Montreal, PQ H3C 3J7, Canada

[2] Queens Univ, Dept Phys, Kingston, ON K7L 3NG, Canada

[3] Indiana Univ, Dept Phys, South Bend, IN 46634 USA

[4] Indiana Univ, Dept Astron, South Bend, IN 46634 USA

[5] Bubble Technol Ind, Chalk River, ON K0J 1J0, Canada

来源：

PHYSICS LETTERS B | 2005年 / 624卷 / 3-4期

基金：

加拿大创新基金会; 加拿大自然科学与工程研究理事会;

关键词：

D O I：

10.1016/j.physletb.2005.08.021

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The PICASSO experiment reports an improved limit for the existence of cold dark matter WIMPs interacting via spin-dependent interactions with nuclei. The experiment is installed in the Sudbury Neutrino Observatory at a depth of 2070 m. With superheated C4F10 droplets as the active material, and an exposure of 1.98 +/- 0.19 kg day, no evidence for a WIMP signal was found. For a WIMP mass of 29 GeV/c(2), limits on the spin-dependent cross section on protons of sigma(p) = 1.31 pb and on neutrons of sigma(n) = 21.5 pb have been obtained at 90% C.L. In both cases, some new parameter space in the region of WIMP masses below 20 GeV/c2 has now been ruled out. The results of these measurements are also presented in terms of limits on the effective WIMP-proton and neutron coupling strengths a(p) and a(n). (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：186 / 194

页数：9

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