Progress in search for antihelium with BESS
Creators
- Sasaki, M.
- Matsumoto, H.
- Nozaki, M.
- Saeki, T.
- Abe, K.
- Anraku, K.
- Asaoka, Y.
- Fujikawa, M.
- Fuke, H.
- Imori, M.
- Haino, S.
- Izumi, K.
- Maeno, T.
- Makida, Y.
- Matsuda, S.
- Matsui, N.
- Matsukawa, T.
- Matsunaga, H.
- Mitchell, J.W.
- Mitsui, T.
- Moiseev, A.
- Motoki, M.
- Nishimura, J.
- Orito, S.
- Ormes, J.F.
- Sanuki, T.
- Shikaze, Y.
- Seo, E.S.
- Sonoda, T.
- Streitmatter, R.
- Suzuki, J.
- Tanaka, K.
- Tanizaki, K.
- Ueda, I.
- Wang, J.Z.
- Yajima, Y.
- Yamagami, Y.
- Yamamoto, A.
- Yamamoto, Y.
- Yamato, K.
- Yoshida, T.
- Yoshimura, K.
Description
We have searched for antihelium nuclei in cosmic rays using the data obtained from balloon flights of the BESS magnetic spectrometer. The search was mainly based on track-quality selection, followed by rigidity analysis, and on the time-of-flight and dE/dx measurements by the scintillation counter hodoscope. We analysed all the data collected during 1993-2000 with a common analysis procedure. No antihelium nuclei events were found in the energy range from 1 to 14 GeV. In order to determine a new upper limit, we have simulated the loss in the air and in the instrument of He (He-bar) using the GEANT/GHEISHA code. Combined with the data collected in 1993 through 2000, a new 95 % confidence upper limit for the ratio of H-bare/He at the top of the atmosphere of 6.8 x 10-7 has been obtained to be after correcting for the interactions in the air and in the instruments
Additional details
Identifiers
- PII
- S092056320201842X;
Publishing Information
- Journal Title
- Nuclear Physics. B, Proceedings Supplements
- Journal Volume
- 113
- Journal Issue
- 1-3
- Journal Page Range
- p. 202-207
- ISSN
- 0920-5632
- CODEN
- NPBSE7
Conference
- Title
- 1. international conference on particle and fundamental physics in space
- Acronym
- SpacePart 2002
- Dates
- 14-19 May 2002
- Place
- La Biodola, Elba (Italy)
INIS
- Country of Publication
- Netherlands
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 34064261
- Subject category
- S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; S46: INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY;
- Resource subtype / Literary indicator
- Conference
- Descriptors DEI
- ANTINUCLEI; BALLOONS; COMPUTERIZED SIMULATION; COSMIC RADIATION; DATA ANALYSIS; GEV RANGE; HELIUM 3; HELIUM 4; MAGNETIC RIGIDITY; MAGNETIC SPECTROMETERS; PARTICLE IDENTIFICATION; PARTICLE TRACKS; TIME-OF-FLIGHT SPECTROMETERS
- Descriptors DEC
- AIRCRAFT; ANTIMATTER; ENERGY RANGE; EVEN-EVEN NUCLEI; EVEN-ODD NUCLEI; HELIUM ISOTOPES; IONIZING RADIATIONS; ISOTOPES; LIGHT NUCLEI; MATTER; MEASURING INSTRUMENTS; NUCLEI; RADIATIONS; SIMULATION; SPECTROMETERS; STABLE ISOTOPES
Optional Information
- Copyright
- Copyright (c) 2002 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.