Numerical simulation of energy relaxation processes in a ZnMoO4 single crystal

We present the results of our experimental investigation and numerical simulation of excitation-energy relaxation processes in zinc molybdate crystals. We show that our kinetic model of the energy relaxation makes it possible to describe basic features of experimental results. Using this model, we estimate the trap concentration in ZnMoO4 upon irradiation of the crystal by VUV synchrotron radiation and X-ray radiation. We conclude that prolonged phosphorescence of ZnMoO4 that is observed after irradiation of the crystal by X-ray radiation can be caused by the occurrence of additional traps with a low activation energy.

[1]  N. Sonoyama,et al.  Analysis of the Excitation and Emission Spectra of Tungstates and Molybdate , 1996 .

[2]  A. Watterich,et al.  Luminescence study of self-trapped holes in pure and Fe- or Mo-doped ZnWO4 crystals , 2004 .

[3]  A. Vedda,et al.  Intrinsic trapping and recombination centers in CdWO 4 investigated using thermally stimulated luminescence , 2009 .

[4]  V. Mikhailik,et al.  Studies of electronic excitations in MgMoO4, CaMoO4 and CdMoO4 crystals using VUV synchrotron radiation , 2005 .

[5]  G. Zimmerer.  SUPERLUMI: A unique setup for luminescence spectroscopy with synchrotron radiation , 2007 .

[6]  A. Vasil’ev,et al.  Trapping and self-trapping in ytterbium-doped oxides with charge transfer luminescence , 2009 .

[7]  T. Weber,et al.  Mischkristallbildung im System CuMoO4/ZnMoO4 , 2000 .

[8]  V. Mikhailin,et al.  Luminescence investigation of zinc molybdate single crystals , 2009 .

[9]  V. Laguta,et al.  Electron spin resonance study of self-trapped holes in CdWO4 scintillator crystals , 2008 .

[10]  Giorgio Spinolo,et al.  Shallow traps in PbWO4 studied by wavelength-resolved thermally stimulated luminescence , 1999 .

[11]  J. Beeman,et al.  Scintillating double-beta-decay bolometers , 2005, nucl-ex/0510074.

[12]  M. Nikl.  Scintillation detectors for x-rays , 2006 .

[13]  H. Ehrenberg,et al.  Optical and luminescence studies of ZnMoO4 using vacuum ultraviolet synchrotron radiation , 2006 .

[14]  W. Ji,et al.  Raman spectroscopic studies on tetragonal ZrO2 supported MoO3 and ZnO–MoO3 systems , 1998 .

[15]  P. Lykov,et al.  Growth and properties of ZnMoO4 single crystals , 2008 .

[16]  J. Beeman,et al.  Performance of ZnMoO4crystal as cryogenic scintillating bolometer to search for double beta decay of molybdenum , 2010, 1010.0103.

[17]  F. Danevich,et al.  Tungstate and Molybdate Scintillators to Search for Dark Matter and Double Beta Decay , 2009, IEEE Transactions on Nuclear Science.

[18]  J. Brophy,et al.  FREQUENCY FACTOR AND ENERGY DISTRIBUTION OF SHALLOW TRAPS IN CADMIUM SULFIDE , 1960 .

[19]  S. Kim,et al.  Development of CaMoO(4) crystal scintillators for double beta decay experiment with Mo-100 , 2007 .