【摘 要】
:
The double beta decay of 136Xe to excited states of 136Ba (DBD-ES) has not yet been discovered experimentally.The experimen-tal signature of such decays,one or two gamma rays following the beta signals,can be identified more effectively in a gaseous detec
【机 构】
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Institute of Nuclear and Particle Physics (INPAC),Shanghai Laboratory for Particle Physics and Cosmo
【出 处】
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中国科学:物理学 力学 天文学(英文版)
论文部分内容阅读
The double beta decay of 136Xe to excited states of 136Ba (DBD-ES) has not yet been discovered experimentally.The experimen-tal signature of such decays,one or two gamma rays following the beta signals,can be identified more effectively in a gaseous detector with the help of topological signatures.We have investigated key parameters of particle trajectories of DBD-ES with Monte Carlo simulation data of the proposed PandaⅩ-Ⅲ detector as an example.The background rates can be reduced by about one order of magnitude while keeping more than half of signals with topological analysis.The estimated half-life sensitivity of DBD-ES can be improved by 1.8 times to 4.1×1023 year (90% C.L.).Similarly,the half-life sensitivity of neutrinoless double beta decay of 136Xe to excited states of 136Ba can be improved by a factor of 4.8 with topological signatures.
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