A study of antineutrino spectra from spent nuclear fuel at Daya Bay  

作　　者：ZHOU Bin RUAN Xi-Chao NIE Yang-Bo ZHOU Zu-Ying AN Feng-Peng CAO Jun 周斌;阮锡超;聂阳波;周祖英;安丰鹏;曹俊(Science and Technology on Nuclear Data Laboratory,China Institute of Atomic Energy,Beijing 102413,China;Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;Northwest Institute of Nuclear Technology,Xi’an 710024,China)

机构地区：[1]Science and Technology on Nuclear Data Laboratory,China Institute of Atomic Energy,Beijing 102413,China [2]Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [3]Northwest Institute of Nuclear Technology,Xi’an 710024,China

出　　处：《Chinese Physics C》2012年第1期1-5,共5页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China (10890094)

摘　　要：The Daya Bay Reactor Antineutrino Experiment is designed to determine the as yet unknown neutrino mixing angle,θ13,by measuring the disappearance of electron antineutrinos from several nuclear reactor cores.The projected sensitivity in sin2（2θ13） of better than 0.01 at a 90% CL should be achieved after three years of data-taking.Antineutrinos emitted from spent nuclear fuel （SNF） distort the soft part of the energy spectrum.In this article,a calculation of the antineutrino spectra from the long-life isotopes in SNF is performed.A non-equilibrium generation of long half-life isotopes during the running time of the reactor is also analyzed.Finally,we show that the antineutrino event rate contribution from SNF,which has been stored in the SNF pool for several years,may be non-negligible.The Daya Bay Reactor Antineutrino Experiment is designed to determine the as yet unknown neutrino mixing angle,θ13,by measuring the disappearance of electron antineutrinos from several nuclear reactor cores.The projected sensitivity in sin2（2θ13） of better than 0.01 at a 90% CL should be achieved after three years of data-taking.Antineutrinos emitted from spent nuclear fuel （SNF） distort the soft part of the energy spectrum.In this article,a calculation of the antineutrino spectra from the long-life isotopes in SNF is performed.A non-equilibrium generation of long half-life isotopes during the running time of the reactor is also analyzed.Finally,we show that the antineutrino event rate contribution from SNF,which has been stored in the SNF pool for several years,may be non-negligible.

关 键 词：spent nuclear fuel antineutrino spectrum NON-EQUILIBRIUM event rate 

分 类 号：O572.321[理学—粒子物理与原子核物理] TH744.1[理学—物理]