Details

Autor(en) / Beteiligte

• Sakai, K
• Fuke, H
• Yoshimura, K
• Sasaki, M
• Abe, K
• Haino, S
• Hams, T
• Hasegawa, M
• Kim, K C
• Lee, M H
• Makida, Y
• Mitchell, J W
• Nishimura, J
• Nozaki, M
• Orito, R
• Ormes, J F
• Seo, E S
• Streitmatter, R E
• Thakur, N
• Yamamoto, A
• Yoshida, T

Titel

Search for Antideuterons of Cosmic Origin Using the BESS-Polar II Magnetic-Rigidity Spectrometer

Ist Teil von

• Physical review letters, 2024-03, Vol.132 (13), p.131001-131001, Article 131001

Ort / Verlag

United States

Erscheinungsjahr

2024

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• We searched for antideuterons (d[over ¯]'s) in the 4.7×10^{9} cosmic-ray events observed during the BESS-Polar II flight at solar minimum in 2007-2008 but found no candidates. The resulting 95% C.L. upper limit on the d[over ¯] flux is 6.7×10^{-5}  (m^{2} s sr GeV/n)^{-1} in an energy range from 0.163 to 1.100  GeV/n. The result has improved by more than a factor of 14 from the upper limit of BESS97, which had a potential comparable to that of BESS-Polar II in the search for cosmic-origin d[over ¯]'s and was conducted during the former solar minimum. The upper limit of d[over ¯] flux from BESS-Polar II is the first result achieving the sensitivity to constrain the latest theoretical predictions.