Author/Authors :
M. Sasaki، نويسنده , , S. Haino، نويسنده , , K. Abe، نويسنده , , H. Fuke، نويسنده , , T. Hams، نويسنده , , K.C. Kim، نويسنده , , M.H. Lee، نويسنده , , Y. Makida، نويسنده , , S. Matsuda، نويسنده , , J.W Mitchell، نويسنده , , A.A Moiseev، نويسنده , , J. Nishimura، نويسنده , , M. Nozaki، نويسنده , , S. Orito، نويسنده , , J.F. Ormes، نويسنده , , T. Sanuki، نويسنده , , E.S. Seo، نويسنده , , Y. Shikaze، نويسنده , , R.E. Streitmatter، نويسنده , , J. Suzuki، نويسنده , , et al.، نويسنده ,
Abstract :
In this paper, we report searches for antihelium in cosmic rays using two recently flown magnetic rigidity spectrometers. BESS-TeV had extended rigidity with an MDR of 1.4 TV and had a flight duration of one day. BESS-Polar was optimized for collecting power. It was flown for 8.5 days and had an MDR of 240 GV. The former flight allows us to explore a previously unexplored rigidity band and the latter flight yields a factor of three improvement in the overall BESS limit. No antihelium candidate was found in the rigidity ranges of 1–500 GV, and 0.6–20 GV, among 7 × 104 events taken with BESS-TeV, and 8 × 106 events taken with BESS-Polar, respectively.
Keywords :
BESS , Cosmic ray , BESS-TeV , Antimatter , Antihelium , BESS-Polar
