Author/Authors :
Cooper، نويسنده , Paul W , R.L. and Alarcon، نويسنده , , Alex R. and Bales، نويسنده , , M.J. and Bass، نويسنده , , C.D. and Beise، نويسنده , , E.J. and Breuer، نويسنده , , H. and Byrne، نويسنده , , J. and Chupp، نويسنده , , T.E. and Coakley، نويسنده , , K.J. and Dewey، نويسنده , , M.S. and Fu، نويسنده , , C. and Gentile، نويسنده , , T.R. and Mumm، نويسنده , , H.P. and Nico، نويسنده , , J.S. and OʹNeill، نويسنده , , B. and Pulliam، نويسنده , , K. and Thomp، نويسنده ,
Abstract :
As part of an experiment to measure the spectrum of photons emitted in beta-decay of the free neutron, we developed and operated a detector consisting of 12 bismuth germanate (BGO) crystals coupled to avalanche photodiodes (APDs). The detector was operated near liquid nitrogen temperature in the bore of a superconducting magnet and registered photons with energies from 5 keV to 1000 keV. To enlarge the detection range, we also directly detected soft X-rays with energies between 0.2 keV and 20 keV with three large area APDs. The construction and operation of the detector are presented, as well as information on operation of APDs at cryogenic temperatures.
Keywords :
Weak interactions , Avalanche photodiode , Bismuth germanate , Cold neutron , Neutron decay , Photon detection
