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Search for Antideuterons of Cosmic Origin Using the BESS-Polar II Magnetic-Rigidity Spectrometer.
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.
Affiliation
  • Sakai K; NASA-Goddard Space Flight Center (NASA-GSFC), Greenbelt, Maryland 20771, USA.
  • Fuke H; Center for Research and Exploration in Space Science and Technology (CRESST).
  • Yoshimura K; Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA), Sagamihara, Kanagawa 252-5210, Japan.
  • Sasaki M; Okayama University, Okayama, Okayama 700-8530, Japan.
  • Abe K; NASA-Goddard Space Flight Center (NASA-GSFC), Greenbelt, Maryland 20771, USA.
  • Haino S; Center for Research and Exploration in Space Science and Technology (CRESST).
  • Hams T; Kobe University, Kobe, Hyogo 657-8501, Japan.
  • Hasegawa M; High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan.
  • Kim KC; NASA-Goddard Space Flight Center (NASA-GSFC), Greenbelt, Maryland 20771, USA.
  • Lee MH; Center for Research and Exploration in Space Science and Technology (CRESST).
  • Makida Y; High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan.
  • Mitchell JW; IPST, University of Maryland, College Park, Maryland 20742, USA.
  • Nishimura J; IPST, University of Maryland, College Park, Maryland 20742, USA.
  • Nozaki M; High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan.
  • Orito R; NASA-Goddard Space Flight Center (NASA-GSFC), Greenbelt, Maryland 20771, USA.
  • Ormes JF; Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (ISAS/JAXA), Sagamihara, Kanagawa 252-5210, Japan.
  • Seo ES; The University of Tokyo, Bunkyo, Tokyo 113-0033, Japan.
  • Streitmatter RE; High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan.
  • Thakur N; Kobe University, Kobe, Hyogo 657-8501, Japan.
  • Yamamoto A; University of Denver, Denver, Colorado 80208, USA.
  • Yoshida T; IPST, University of Maryland, College Park, Maryland 20742, USA.
Phys Rev Lett ; 132(13): 131001, 2024 Mar 29.
Article in En | MEDLINE | ID: mdl-38613296
ABSTRACT
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.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2024 Type: Article Affiliation country: United States
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2024 Type: Article Affiliation country: United States