Measurement of nuclear recoil quenching factors in CaWO4

被引：13

作者：

Jagemann, Th.

v. Fellitzsch, F.

Hagn, H.

Jochum, J.

Potzel, W.

Rau, W.

Stark, M.

Westphal, W.

机构：

[1] Univ Tubingen, Inst Phys, D-72076 Tubingen, Germany

[2] Tech Univ Munich, Phys Dept E15, D-85748 Garching, Germany

来源：

ASTROPARTICLE PHYSICS | 2006年 / 26卷 / 4-5期

关键词：

quenching factor; nuclear recoils; dark matter; neutron scattering; scintillation;

D O I：

10.1016/j.astropartphys.2006.06.010

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The CRESST experiment, aiming at the direct detection of WIMPs via nuclear recoils, is currently using scintillating CaWO4 crystals. The WIMP-nucleus cross section for elastic scattering as well as the scintillation efficiency differ considerably for recoils from Ca, W and 0 in these crystals. Therefore a discriminating detector calibration is essential in order to improve WIMP parameter claims. At the tandem accelerator of the Maier-Leibnitz-Laboratory (MLL) in Garching, Germany, a neutron scattering facility is operated for the determination of the individual quenching factors (QF) in the bulk of a CaWO4 crystal to better understand the detector response to neutron background and a possible WIMP signal. First measurements at room temperature reveal QF(O) = 7.8 +/- 0.3% (recoil energy 1.0-2.2 MeV), QF(Ca) = 6.3 +/- 1.6% (recoil energy 0.4-1 MeV), QF(W) < 3.0% (2 sigma, recoil energy 0.1 MeV). (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：269 / 281

页数：13

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