Characteristics of alpha, gamma and nuclear recoil pulses from NaI(Tl) at 10-100 keV relevant to dark matter searches

被引：31

作者：

Kudryavtsev, VA ^{[1
]}

Lehner, MJ

Peak, CD

Lawson, TB

Lightfoot, PK

McMillan, JE

Roberts, JW

Spooner, NJC

Tovey, DR

Ward, CK

Smith, PF

Smith, NJT

机构：

[1] Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England

[2] Rutherford Appleton Lab, Chilton OX11 0QX, England

来源：

PHYSICS LETTERS B | 1999年 / 452卷 / 1-2期

关键词：

scintillation detectors; dark matter; WIMP; radioactive sources; pulse-shape discrimination;

D O I：

10.1016/S0370-2693(99)00270-1

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Measurements of the shapes of scintillation pulses produced by nuclear recoils, alpha particles and photons in NaI(Tl) crystals at visible energies of 10-100 keV have been performed in order to investigate possible sources of background in NaI(TI) dark matter experiments and, in particular, the possible origin of the anomalous fast time constant events observed in the UK Dark Matter Collaboration experiments at Boulby mine [P.F. Smith et al., Phys. Rep. 307 (1998) 275]. Pulses initiated by X-rays (via photoelectric effect close to the surface of the crystal) were found not to differ from those produced by high-energy photons (via Compton electrons inside the crystal) within experimental errors. However, pulses induced by alpha particles (degraded from an external MeV source) were found to be similar to 10% faster than those of nuclear recoils, but insufficiently fast to account for the anomalous events. (C) 1999 Published by Elsevier Science B.V. All rights reserved.

引用

页码：167 / 172

页数：6

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