Responses of Superheated Superconducting Tin Granules to α-Ray Irradiations in Various Energy

概要

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By sampling spherical tin granules of diameter from 145 through 250 /fill one byone, we studied responses of them in the superheated superconducting state to inci-dent GV particles of energies less than 4.7 MeV in a range of temperature from 2.25 to3.00 K in magnetic fields. Line shapes of the signals obtained in the phase transitionwere found out to have a half-width of 4 - 8 ps in time. The energy sensitivity of thespecimens was ascertained to increase with decreasing temperature. The superheatedstate turns normal with an energy deposit two orders of magnitude less than that is re-quired for the whole of a granule to be uniformly heated up. This means that heating- 0.1 % of the volume is enough to trigger the full penetration of an applied field intoa hit granule. Our results offer elements indispensable for applying the breakdown ofthe Meissner effect to the detection of weakly-interacting particles.
社団法人日本物理学会の論文
1991-04-15