Data taken with ACT2 and ACT3 between 1995 and 1997 are used to search for 0.1 s bursts of TeV gamma ray from evaporating primordial black holes(PBHs).There is no evidence for such bursts in the dataset.Using the resu...Data taken with ACT2 and ACT3 between 1995 and 1997 are used to search for 0.1 s bursts of TeV gamma ray from evaporating primordial black holes(PBHs).There is no evidence for such bursts in the dataset.Using the result,the upper limit of 3×10^(8) pc^(-3)yr^(-1) on the rate-density of evaporating PBHs is set in the vicinity of the solar system at a 99%confidence level.展开更多
An acoustic radiation effect may be produced by ultrahigh energy particles while traversing water. The idea of using the acoustic radiation effect to detect ultrahigh energy particle interaction was first suggested in...An acoustic radiation effect may be produced by ultrahigh energy particles while traversing water. The idea of using the acoustic radiation effect to detect ultrahigh energy particle interaction was first suggested in 1975. This is a new subject for research. In the U.S.A. and the U.S.S.R., experiments of this idea were begun on the accelerator around 1976. In order to understand sound signal’s basic properties and their relations with the parameters of the medium and the energy of the particle beam so as to analyse the mechanism of sound production, more systematic experiments of the acoustic radiation effect produced by the electron beam were carried out on the 30 MeV electron linac in October 1979. All the walls and the bottom of the water tank展开更多
基金Supported by the President Foundation of the Chinese Academy of Sciencesthe National Natural Science Foundation of China under Grant No.19135032.
文摘Data taken with ACT2 and ACT3 between 1995 and 1997 are used to search for 0.1 s bursts of TeV gamma ray from evaporating primordial black holes(PBHs).There is no evidence for such bursts in the dataset.Using the result,the upper limit of 3×10^(8) pc^(-3)yr^(-1) on the rate-density of evaporating PBHs is set in the vicinity of the solar system at a 99%confidence level.
文摘An acoustic radiation effect may be produced by ultrahigh energy particles while traversing water. The idea of using the acoustic radiation effect to detect ultrahigh energy particle interaction was first suggested in 1975. This is a new subject for research. In the U.S.A. and the U.S.S.R., experiments of this idea were begun on the accelerator around 1976. In order to understand sound signal’s basic properties and their relations with the parameters of the medium and the energy of the particle beam so as to analyse the mechanism of sound production, more systematic experiments of the acoustic radiation effect produced by the electron beam were carried out on the 30 MeV electron linac in October 1979. All the walls and the bottom of the water tank
