Search for supermassive relics

S. Nakamura, Kiyotomo Kawagoe, K. Yamamoto, S. Orito, H. Ichinose, T. Doke, T. Hayashi, H. Tawara, K. Ogura

Research output: Contribution to journalArticle

11 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)395-399
Number of pages5
JournalPhysics Letters B
Issue number3-4
Publication statusPublished - Jan 15 1987
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

Nakamura, S., Kawagoe, K., Yamamoto, K., Orito, S., Ichinose, H., Doke, T., ... Ogura, K. (1987). Search for supermassive relics. Physics Letters B, 183(3-4), 395-399.