Spatially uniform calibration of a liquid xenon detector at low energies using (83m)Kr.

A difficult task with many particle detectors focusing on interactions below approximately 100 keV is to perform a calibration in the appropriate energy range that adequately probes all regions of the detector. Because detector response can vary greatly in various locations within the device, a spatially uniform calibration is important. We present a new method for calibration of liquid xenon (LXe) detectors, using the short-lived (83m)Kr. This source has transitions at 9.4 and 32.1 keV, and as a noble gas like Xe, it disperses uniformly in all regions of the detector. Even for low source activities, the existence of the two transitions provides a method of identifying the decays that is free of background. We find that at decreasing energies, the LXe light yield increases, while the amount of electric field quenching is diminished. Additionally, we show that if any long-lived radioactive backgrounds are introduced by this method, they will present less than 67x10(-6) events kg(-1) day(-1) keV(-1) in the next generation of LXe dark matter direct detection searches.

[1]  D. Mckinsey,et al.  Calibration of a Liquid Xenon Detector with Kr-83m , 2009, 0905.1766.

[2]  A. J. Hughes,et al.  Results from the first science run of the ZEPLIN-III dark matter search experiment , 2008, 0812.1150.

[3]  C. Winant,et al.  Limits on spin-dependent WIMP-nucleon cross sections from the XENON10 experiment. , 2008, Physical review letters.

[4]  K. Giboni,et al.  Compton Positron Emission Tomography with a Liquid Xenon Time Projection Chamber , 2007 .

[5]  D. Mckinsey,et al.  Preparation of Neutron-activated Xenon for Liquid Xenon Detector Calibration , 2007, 0708.1976.

[6]  C. Winant,et al.  First results from the XENON10 dark matter experiment at the Gran Sasso National Laboratory. , 2007, Physical review letters.

[7]  G. J. Alner,et al.  First limits on WIMP nuclear recoil signals in ZEPLIN-II: A two-phase xenon detector for dark matter detection , 2007, astro-ph/0701858.

[8]  P. Fierlinger,et al.  A Liquid Xenon Ionization Chamber in an All-Fluoropolymer Vessel , 2006, physics/0611183.

[9]  T. Shutt,et al.  Performance and fundamental processes at low energy in a two-phase liquid xenon dark matter detector , 2006, astro-ph/0608137.

[10]  T. Shutt,et al.  Simultaneous measurement of ionization and scintillation from nuclear recoils in liquid xenon for a dark matter experiment. , 2006, Physical review letters.

[11]  D. Vénos,et al.  (83m)Kr radioactive source based on (83)Rb trapped in cation-exchange paper or in zeolite. , 2005, Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine.

[12]  G. J. Alner,et al.  First limits on nuclear recoil events from the ZEPLIN I galactic dark , 2005 .

[13]  G. Bertone,et al.  Particle dark matter: Evidence, candidates and constraints , 2004, hep-ph/0404175.

[14]  S. Suzuki,et al.  Double phase (liquid/gas) xenon scintillation detector for WIMPs direct search , 2003 .

[15]  A. Hitachi,et al.  Absolute Scintillation Yields in Liquid Argon and Xenon for Various Particles , 2002 .

[16]  R. Firestone,et al.  WWW Table of Radioactive Isotopes , 1999 .

[17]  A. Bolozdynya,et al.  Two-phase emission detectors and their applications , 1999 .

[18]  J. D. Lewin,et al.  Review of mathematics, numerical factors, and corrections for dark matter experiments based on elastic nuclear recoil , 1996 .

[19]  W. D. Thomas,et al.  Performance of the HPC calorimeter in DELPHI , 1995 .

[20]  M. Kamionkowski,et al.  Supersymmetric Dark Matter , 1995, hep-ph/9506380.

[21]  Hansen,et al.  ALEPH: A detector for electron-positron annihilations at LEP , 1990 .

[22]  Thomas,et al.  Recombination of electron-ion pairs in liquid argon and liquid xenon. , 1987, Physical review. A, General physics.

[23]  S. Kubota,et al.  Average energy expended per ion pair in liquid xenon , 1975 .

[24]  O. Cheshnovsky,et al.  Temperature dependence of rare gas molecular emission in the vacuum ultraviolet , 1972 .

[25]  W. Spear,et al.  Charge Transport in Solid and Liquid Ar, Kr, and Xe , 1968 .

[26]  G. Baldini.  Ultraviolet Absorption of Solid Argon, Krypton, and Xenon , 1962 .

[27]  N. N. Khovanski,et al.  DELPHI Collaboration , 1998 .

[28]  P. Azzurri,et al.  The ALEPH Collaboration , 1997 .