We have conducted an underground search for supermassive relic particles by an 80 m2 array consisting of three layers of track detector CR-39. The non-observation of penetrating tracks places the velocity-dependent flux upper limits down to 2 × 10-14 cm-2 s -1 sr-1 for various electrically or magnetically charged particles under assumptions on their energy losses in the low- velocity region. Assuming that the nuclear recoils are effective to the track formation of CR-39, this experiment sets the best flux limits for such relic particles in the velocity region 4 × 10-5 <β<2 × 10-4.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics