BLACKBODY SOURCE AND DETECTOR OF BALLISTIC QUASI-PARTICLES IN HE-3-B - EMISSION ANGLE FROM A WIRE MOVING AT SUPERCRITICAL VELOCITY

被引:84
作者
FISHER, SN
GUENAULT, AM
KENNEDY, CJ
PICKETT, GR
机构
[1] School of Physics and Materials, Lancaster University
关键词
D O I
10.1103/PhysRevLett.69.1073
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Using a new quasiparticle detector and source consisting of a blackbody radiator, we have made the first measurements of the divergence of a beam of quasiparticles produced by a vibrating-wire resonator moving at supercritical velocities in superfluid He-3-B at the zero-temperature limit. At velocities just above the critical velocity of DELTA/3PF we see a very narrow beam directed along the direction of motion of the wire. As the maximum wire velocity increases the beam spreads to saturate at a half-angle divergence of approximately 55-degrees at a maximum velocity of order DELTA/PF.
引用
收藏
页码:1073 / 1076
页数:4
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