Configuration Mixing in Particle Decay and Reaction

摘要

Recent controversy on the existence (versus non-existence) of variability in the observationof decay rate can be settled by considering mixing in decay configuration.Variability in decay rate was investigated based on the available information of betadecay rate data, solar neutrino flux, and energy distribution. Full systematic analysis ofthe oscillatory behavior was carried out. Based on the zero threshold energy for neutrinoabsorption in beta emitters, a model for configuration mixing between two distinctbeta disintegration modes -disintegration (electron from neutrino interaction) and the ??-disintegration (electron from natural decay) was proposed. The phenomenon of variabilityin beta decay rate was related to the possible exothermic neutrino absorption byunstable nuclei which, in principle, should include the whole range of flux energiesinvolving flux with energy below the 71Ga threshold at 0.23 MeV. These two disintegrationmodes occur independently and model for their apparent mixing rate was proposed.The configuration mixing between the two modes cause depletion of radioactive nucleiwhich is subject to change with seasonal solar neutrino variability. Ability to detect thisvariability was found to be dependent on the Q-value of the disintegration and detectioninstrument setup. Value of neutrino cross section, weighted by the ratio between and ?? detection e ciencies, was found to be in the range 10??44 to 10??36 cm2. Forexperiments that uses the end point to determine the neutrino mass, interference due tomixing should be taken into account.