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1. Measurements of cosmic-ray proton and helium spectra from the BESS-Polar long-duration balloon flights over Antarctica

Author

Abe, K., Fuke, H., Haino, S., Hams, T., Hasegawa, M., Horikoshi, A., Itazaki, A., Kim, K. C., Kumazawa, T., Kusumoto, A., Lee, M. H., Makida, Y., Matsuda, S., Matsukawa, Y., Matsumoto, K., Mitchell, J. W., Myers, Z., Nishimura, J., Nozaki, M., Orito, R., Ormes, J. F., Picot-Clemente, N., Sakai, K., Sasaki, M., Seo, E. S., Shikaze, Y., Shinoda, R., Streitmatter, R. E., Suzuki, J., Takasugi, Y., Takeuchi, K., Tanaka, K., Thakur, N., Yamagami, T., Yamamoto, A., Yoshida, T., Yoshimura, K., Abe, K., Fuke, H., Haino, S., Hams, T., Hasegawa, M., Horikoshi, A., Itazaki, A., Kim, K. C., Kumazawa, T., Kusumoto, A., Lee, M. H., Makida, Y., Matsuda, S., Matsukawa, Y., Matsumoto, K., Mitchell, J. W., Myers, Z., Nishimura, J., Nozaki, M., Orito, R., Ormes, J. F., Picot-Clemente, N., Sakai, K., Sasaki, M., Seo, E. S., Shikaze, Y., Shinoda, R., Streitmatter, R. E., Suzuki, J., Takasugi, Y., Takeuchi, K., Tanaka, K., Thakur, N., Yamagami, T., Yamamoto, A., Yoshida, T., and Yoshimura, K.

Abstract

The BESS-Polar Collaboration measured the energy spectra of cosmic-ray protons and helium during two long-duration balloon flights over Antarctica in December 2004 and December 2007, at substantially different levels of solar modulation. Proton and helium spectra probe the origin and propagation history of cosmic rays in the galaxy, and are essential to calculations of the expected spectra of cosmic-ray antiprotons, positrons, and electrons from interactions of primary cosmic-ray nuclei with the interstellar gas, and to calculations of atmospheric muons and neutrinos. We report absolute spectra at the top of the atmosphere for cosmic-ray protons in the kinetic energy range 0.2-160 GeV and helium nuclei 0.15-80 GeV/nucleon. The corresponding magnetic rigidity ranges are 0.6-160 GV for protons and 1.1-160 GV for helium. These spectra are compared to measurements from previous BESS flights and from ATIC-2, PAMELA, and AMS-02. We also report the ratio of the proton and helium fluxes from 1.1 GV to 160 GV and compare to ratios from PAMELA and AMS-02., Comment: 23 pages, 11 figures, Accepted for publication in The Astrophysical Journal

Published
2015
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2. Measurement of the cosmic-ray antiproton spectrum at solar minimum with a long-duration balloon flight over Antarctica

Author

安部, 航, 福家, 英之, 灰野, 禎一, Hams, T., 長谷川, 雅也, 堀越, 篤, Kim, K. C., 楠本, 彬, Lee, M. H., 槙田, 康博, 松田, 晋弥, 松川, 陽介, Mitchell, J. W., 西村, 純, 野崎, 光昭, 折戸, 玲子, Ormes, J. F., 坂井, 賢一, 佐々木, 誠, Seo, E. S., 篠田, 遼子, Streitmatter, R. E., 鈴木, 純一, 田中, 賢一, Thakur, N., 山上, 隆正, 山本, 明, 吉田, 哲也, 吉村, 浩司, Abe, K., Fuke, Hideyuki, Haino, S., Hasegawa, M., Horikoshi, A., Kusumoto, A., Makida, Y., Matsuda, S., Matsukawa, Y., Nishimura, Jun, Nozaki, M., Orito, R., Sakai, K., Sasaki, M., Shinoda, R., Suzuki, J., Tanaka, K., Yamagami, T., Yamamoto, A., Yoshida, Tetsuya, Yoshimura, K., 安部, 航, 福家, 英之, 灰野, 禎一, Hams, T., 長谷川, 雅也, 堀越, 篤, Kim, K. C., 楠本, 彬, Lee, M. H., 槙田, 康博, 松田, 晋弥, 松川, 陽介, Mitchell, J. W., 西村, 純, 野崎, 光昭, 折戸, 玲子, Ormes, J. F., 坂井, 賢一, 佐々木, 誠, Seo, E. S., 篠田, 遼子, Streitmatter, R. E., 鈴木, 純一, 田中, 賢一, Thakur, N., 山上, 隆正, 山本, 明, 吉田, 哲也, 吉村, 浩司, Abe, K., Fuke, Hideyuki, Haino, S., Hasegawa, M., Horikoshi, A., Kusumoto, A., Makida, Y., Matsuda, S., Matsukawa, Y., Nishimura, Jun, Nozaki, M., Orito, R., Sakai, K., Sasaki, M., Shinoda, R., Suzuki, J., Tanaka, K., Yamagami, T., Yamamoto, A., Yoshida, Tetsuya, and Yoshimura, K.

Abstract

著者人数: 29名

Published
2015

3. Measurements of cosmic-ray proton and helium spectra from the BESS-Polar long-duration balloon flights over Antarctica

Author

Abe, K., Fuke, H., Haino, S., Hams, T., Hasegawa, M., Horikoshi, A., Itazaki, A., Kim, K. C., Kumazawa, T., Kusumoto, A., Lee, M. H., Makida, Y., Matsuda, S., Matsukawa, Y., Matsumoto, K., Mitchell, J. W., Myers, Z., Nishimura, J., Nozaki, M., Orito, R., Ormes, J. F., Picot-Clemente, N., Sakai, K., Sasaki, M., Seo, E. S., Shikaze, Y., Shinoda, R., Streitmatter, R. E., Suzuki, J., Takasugi, Y., Takeuchi, K., Tanaka, K., Thakur, N., Yamagami, T., Yamamoto, A., Yoshida, T., Yoshimura, K., Abe, K., Fuke, H., Haino, S., Hams, T., Hasegawa, M., Horikoshi, A., Itazaki, A., Kim, K. C., Kumazawa, T., Kusumoto, A., Lee, M. H., Makida, Y., Matsuda, S., Matsukawa, Y., Matsumoto, K., Mitchell, J. W., Myers, Z., Nishimura, J., Nozaki, M., Orito, R., Ormes, J. F., Picot-Clemente, N., Sakai, K., Sasaki, M., Seo, E. S., Shikaze, Y., Shinoda, R., Streitmatter, R. E., Suzuki, J., Takasugi, Y., Takeuchi, K., Tanaka, K., Thakur, N., Yamagami, T., Yamamoto, A., Yoshida, T., and Yoshimura, K.

Abstract

The BESS-Polar Collaboration measured the energy spectra of cosmic-ray protons and helium during two long-duration balloon flights over Antarctica in December 2004 and December 2007, at substantially different levels of solar modulation. Proton and helium spectra probe the origin and propagation history of cosmic rays in the galaxy, and are essential to calculations of the expected spectra of cosmic-ray antiprotons, positrons, and electrons from interactions of primary cosmic-ray nuclei with the interstellar gas, and to calculations of atmospheric muons and neutrinos. We report absolute spectra at the top of the atmosphere for cosmic-ray protons in the kinetic energy range 0.2-160 GeV and helium nuclei 0.15-80 GeV/nucleon. The corresponding magnetic rigidity ranges are 0.6-160 GV for protons and 1.1-160 GV for helium. These spectra are compared to measurements from previous BESS flights and from ATIC-2, PAMELA, and AMS-02. We also report the ratio of the proton and helium fluxes from 1.1 GV to 160 GV and compare to ratios from PAMELA and AMS-02., Comment: 23 pages, 11 figures, Accepted for publication in The Astrophysical Journal

Published
2015
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4. Search for Antihelium with the BESS-Polar Spectrometer

Author

Abe, K., Fuke, H., Haino, S., Hams, T., Hasegawa, M., Horikoshi, A., Itazaki, A., Kim, K. C., Kumazawa, T., Kusumoto, A., Lee, M. H., Makida, Y., Matsuda, S., Matsukawa, Y., Matsumoto, K., Mitchell, J. W., Myers, Z., Nishimura, J., Nozaki, M., Orito, R., Ormes, J. F., Sakai, K., Sasaki, M., Seo, E. S., Shikaze, Y., Shinoda, R., Streitmatter, R. E., Suzuki, J., Takasugi, Y., Takeuchi, K., Tanaka, K., Thakur, N., Yamagami, T., Yamamoto, A., Yoshida, T., Yoshimura, K., Abe, K., Fuke, H., Haino, S., Hams, T., Hasegawa, M., Horikoshi, A., Itazaki, A., Kim, K. C., Kumazawa, T., Kusumoto, A., Lee, M. H., Makida, Y., Matsuda, S., Matsukawa, Y., Matsumoto, K., Mitchell, J. W., Myers, Z., Nishimura, J., Nozaki, M., Orito, R., Ormes, J. F., Sakai, K., Sasaki, M., Seo, E. S., Shikaze, Y., Shinoda, R., Streitmatter, R. E., Suzuki, J., Takasugi, Y., Takeuchi, K., Tanaka, K., Thakur, N., Yamagami, T., Yamamoto, A., Yoshida, T., and Yoshimura, K.

Abstract

In two long-duration balloon flights over Antarctica, the BESS-Polar collaboration has searched for antihelium in the cosmic radiation with higher sensitivity than any reported investigation. BESS- Polar I flew in 2004, observing for 8.5 days. BESS-Polar II flew in 2007-2008, observing for 24.5 days. No antihelium candidate was found in BESS-Polar I data among 8.4\times 10^6 |Z| = 2 nuclei from 1.0 to 20 GV or in BESS-Polar II data among 4.0\times 10^7 |Z| = 2 nuclei from 1.0 to 14 GV. Assuming antihelium to have the same spectral shape as helium, a 95% confidence upper limit of 6.9 \times 10^-8 was determined by combining all the BESS data, including the two BESS-Polar flights. With no assumed antihelium spectrum and a weighted average of the lowest antihelium efficiencies from 1.6 to 14 GV, an upper limit of 1.0 \times 10^-7 was determined for the combined BESS-Polar data. These are the most stringent limits obtained to date., Comment: 4 pages, 4 figures

Published
2012
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5. Search for Antihelium with the BESS-Polar Spectrometer

Author

Abe, K., Fuke, H., Haino, S., Hams, T., Hasegawa, M., Horikoshi, A., Itazaki, A., Kim, K. C., Kumazawa, T., Kusumoto, A., Lee, M. H., Makida, Y., Matsuda, S., Matsukawa, Y., Matsumoto, K., Mitchell, J. W., Myers, Z., Nishimura, J., Nozaki, M., Orito, R., Ormes, J. F., Sakai, K., Sasaki, M., Seo, E. S., Shikaze, Y., Shinoda, R., Streitmatter, R. E., Suzuki, J., Takasugi, Y., Takeuchi, K., Tanaka, K., Thakur, N., Yamagami, T., Yamamoto, A., Yoshida, T., Yoshimura, K., Abe, K., Fuke, H., Haino, S., Hams, T., Hasegawa, M., Horikoshi, A., Itazaki, A., Kim, K. C., Kumazawa, T., Kusumoto, A., Lee, M. H., Makida, Y., Matsuda, S., Matsukawa, Y., Matsumoto, K., Mitchell, J. W., Myers, Z., Nishimura, J., Nozaki, M., Orito, R., Ormes, J. F., Sakai, K., Sasaki, M., Seo, E. S., Shikaze, Y., Shinoda, R., Streitmatter, R. E., Suzuki, J., Takasugi, Y., Takeuchi, K., Tanaka, K., Thakur, N., Yamagami, T., Yamamoto, A., Yoshida, T., and Yoshimura, K.

Abstract

In two long-duration balloon flights over Antarctica, the BESS-Polar collaboration has searched for antihelium in the cosmic radiation with higher sensitivity than any reported investigation. BESS- Polar I flew in 2004, observing for 8.5 days. BESS-Polar II flew in 2007-2008, observing for 24.5 days. No antihelium candidate was found in BESS-Polar I data among 8.4\times 10^6 |Z| = 2 nuclei from 1.0 to 20 GV or in BESS-Polar II data among 4.0\times 10^7 |Z| = 2 nuclei from 1.0 to 14 GV. Assuming antihelium to have the same spectral shape as helium, a 95% confidence upper limit of 6.9 \times 10^-8 was determined by combining all the BESS data, including the two BESS-Polar flights. With no assumed antihelium spectrum and a weighted average of the lowest antihelium efficiencies from 1.6 to 14 GV, an upper limit of 1.0 \times 10^-7 was determined for the combined BESS-Polar data. These are the most stringent limits obtained to date., Comment: 4 pages, 4 figures

Published
2012
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6. Measurement of the cosmic-ray antiproton spectrum at solar minimum with a long-duration balloon flight over Antarctica

Author

Abe, K., Fuke, H., Haino, S., Hams, T., Hasegawa, M., Horikoshi, A., Kim, K. C., Kusumoto, A., Lee, M. H., Makida, Y., Matsuda, S., Matsukawa, Y., Mitchell, J. W., Nishimura, J., Nozaki, M., Orito, R., Ormes, J. F., Sakai, K., Sasaki, M., Seo, E. S., Shinoda, R., Streitmatter, R. E., Suzuki, J., Tanaka, K., Thakur, N., Yamagami, T., Yamamoto, A., Yoshida, T., Yoshimura, K., Abe, K., Fuke, H., Haino, S., Hams, T., Hasegawa, M., Horikoshi, A., Kim, K. C., Kusumoto, A., Lee, M. H., Makida, Y., Matsuda, S., Matsukawa, Y., Mitchell, J. W., Nishimura, J., Nozaki, M., Orito, R., Ormes, J. F., Sakai, K., Sasaki, M., Seo, E. S., Shinoda, R., Streitmatter, R. E., Suzuki, J., Tanaka, K., Thakur, N., Yamagami, T., Yamamoto, A., Yoshida, T., and Yoshimura, K.

Abstract

The energy spectrum of cosmic-ray antiprotons from 0.17 to 3.5 GeV has been measured using 7886 antiprotons detected by BESS-Polar II during a long-duration flight over Antarctica near solar minimum in December 2007 and January 2008. This shows good consistency with secondary antiproton calculations. Cosmologically primary antiprotons have been investigated by comparing measured and calculated antiproton spectra. BESS-Polar II data show no evidence of primary antiprotons from evaporation of primordial black holes., Comment: 4 pages, 4 figures, submitted to Physical Review Letters

Published
2011
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7. Measurement of the cosmic-ray antiproton spectrum at solar minimum with a long-duration balloon flight over Antarctica

Author

Abe, K., Fuke, H., Haino, S., Hams, T., Hasegawa, M., Horikoshi, A., Kim, K. C., Kusumoto, A., Lee, M. H., Makida, Y., Matsuda, S., Matsukawa, Y., Mitchell, J. W., Nishimura, J., Nozaki, M., Orito, R., Ormes, J. F., Sakai, K., Sasaki, M., Seo, E. S., Shinoda, R., Streitmatter, R. E., Suzuki, J., Tanaka, K., Thakur, N., Yamagami, T., Yamamoto, A., Yoshida, T., Yoshimura, K., Abe, K., Fuke, H., Haino, S., Hams, T., Hasegawa, M., Horikoshi, A., Kim, K. C., Kusumoto, A., Lee, M. H., Makida, Y., Matsuda, S., Matsukawa, Y., Mitchell, J. W., Nishimura, J., Nozaki, M., Orito, R., Ormes, J. F., Sakai, K., Sasaki, M., Seo, E. S., Shinoda, R., Streitmatter, R. E., Suzuki, J., Tanaka, K., Thakur, N., Yamagami, T., Yamamoto, A., Yoshida, T., and Yoshimura, K.

Abstract

The energy spectrum of cosmic-ray antiprotons from 0.17 to 3.5 GeV has been measured using 7886 antiprotons detected by BESS-Polar II during a long-duration flight over Antarctica near solar minimum in December 2007 and January 2008. This shows good consistency with secondary antiproton calculations. Cosmologically primary antiprotons have been investigated by comparing measured and calculated antiproton spectra. BESS-Polar II data show no evidence of primary antiprotons from evaporation of primordial black holes., Comment: 4 pages, 4 figures, submitted to Physical Review Letters

Published
2011
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8. High-energy electron observations by PPB-BETS flight in Antarctica

Author

Torii, S., Yamagami, T., Tamura, T., Yoshida, K., Kitamura, H., Anraku, K., Chang, J., Ejiri, M., Iijima, I., Kadokura, A., Kasahara, K., Katayose, Y., Kobayashi, T., Komori, Y., Matsuzaka, Y., Mizutani, K., Murakami, H., Namiki, M., Nishimura, J., Ohta, S., Saito, Y., Shibata, M., Tateyama, N., Yamagishi, H., Yamashita, T., Yuda, T., Torii, S., Yamagami, T., Tamura, T., Yoshida, K., Kitamura, H., Anraku, K., Chang, J., Ejiri, M., Iijima, I., Kadokura, A., Kasahara, K., Katayose, Y., Kobayashi, T., Komori, Y., Matsuzaka, Y., Mizutani, K., Murakami, H., Namiki, M., Nishimura, J., Ohta, S., Saito, Y., Shibata, M., Tateyama, N., Yamagishi, H., Yamashita, T., and Yuda, T.

Abstract

We have observed cosmic-ray electrons from 10 GeV to 800 GeV by a long duration balloon flight using Polar Patrol Balloon (PPB) in Antarctica. The observation was carried out for 13 days at an average altitude of 35 km in January 2004. The detector is an imaging calorimeter composed of scintillating-fiber belts and plastic scintillators inserted between lead plates with 9 radiation lengths. The performance of the detector has been confirmed by the CERN-SPS beam test and also investigated by Monte-Carlo simulations. New telemetry system using a commercial satellite of Iridium, power supply by solar batteries, and automatic level control using CPU have successfully been developed and operated during the flight. From the long duration balloon observations, we derived the energy spectrum of cosmic-ray electrons in the energy range from 100 GeV to 800 GeV. In addition, for the first time we derived the electron arrival directions above 100 GeV, which is consistent with the isotropic distribution., Comment: 22 pages, 13 figures, submitted to Astropart. Phys

Published
2008

9. Measurement of cosmic-ray low-energy antiproton spectrum with the first BESS-Polar Antarctic flight

Author

Abe, K., Fuke, H., Haino, S., Hams, T., Itazaki, A., Kim, K. C., Kumazawa, T., Lee, M. H., Makida, Y., Matsuda, S., Matsumoto, K., Mitchell, J. W., Moiseev, A. A., Myers, Z., Nishimura, J., Nozaki, M., Orito, R., Ormes, J. F., Sasaki, M., Seo, E. S., Shikaze, Y., Streitmatter, R. E., Suzuki, J., Takasugi, Y., Takeuchi, K., Tanaka, K., Yamagami, T., Yamamoto, A., Yoshida, T., Yoshimura, K., Abe, K., Fuke, H., Haino, S., Hams, T., Itazaki, A., Kim, K. C., Kumazawa, T., Lee, M. H., Makida, Y., Matsuda, S., Matsumoto, K., Mitchell, J. W., Moiseev, A. A., Myers, Z., Nishimura, J., Nozaki, M., Orito, R., Ormes, J. F., Sasaki, M., Seo, E. S., Shikaze, Y., Streitmatter, R. E., Suzuki, J., Takasugi, Y., Takeuchi, K., Tanaka, K., Yamagami, T., Yamamoto, A., Yoshida, T., and Yoshimura, K.

Abstract

The BESS-Polar spectrometer had its first successful balloon flight over Antarctica in December 2004. During the 8.5-day long-duration flight, almost 0.9 billion events were recorded and 1,520 antiprotons were detected in the energy range 0.1-4.2 GeV. In this paper, we report the antiproton spectrum obtained, discuss the origin of cosmic-ray antiprotons, and use antiprotons to probe the effect of charge sign dependent drift in the solar modulation., Comment: 18 pages, 1 table, 5 figures, submitted to Physics Letters B

Published
2008
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10. High-energy electron observations by PPB-BETS flight in Antarctica

Author

Torii, S., Yamagami, T., Tamura, T., Yoshida, K., Kitamura, H., Anraku, K., Chang, J., Ejiri, M., Iijima, I., Kadokura, A., Kasahara, K., Katayose, Y., Kobayashi, T., Komori, Y., Matsuzaka, Y., Mizutani, K., Murakami, H., Namiki, M., Nishimura, J., Ohta, S., Saito, Y., Shibata, M., Tateyama, N., Yamagishi, H., Yamashita, T., Yuda, T., Torii, S., Yamagami, T., Tamura, T., Yoshida, K., Kitamura, H., Anraku, K., Chang, J., Ejiri, M., Iijima, I., Kadokura, A., Kasahara, K., Katayose, Y., Kobayashi, T., Komori, Y., Matsuzaka, Y., Mizutani, K., Murakami, H., Namiki, M., Nishimura, J., Ohta, S., Saito, Y., Shibata, M., Tateyama, N., Yamagishi, H., Yamashita, T., and Yuda, T.

Abstract

We have observed cosmic-ray electrons from 10 GeV to 800 GeV by a long duration balloon flight using Polar Patrol Balloon (PPB) in Antarctica. The observation was carried out for 13 days at an average altitude of 35 km in January 2004. The detector is an imaging calorimeter composed of scintillating-fiber belts and plastic scintillators inserted between lead plates with 9 radiation lengths. The performance of the detector has been confirmed by the CERN-SPS beam test and also investigated by Monte-Carlo simulations. New telemetry system using a commercial satellite of Iridium, power supply by solar batteries, and automatic level control using CPU have successfully been developed and operated during the flight. From the long duration balloon observations, we derived the energy spectrum of cosmic-ray electrons in the energy range from 100 GeV to 800 GeV. In addition, for the first time we derived the electron arrival directions above 100 GeV, which is consistent with the isotropic distribution., Comment: 22 pages, 13 figures, submitted to Astropart. Phys

Published
2008

11. Measurement of cosmic-ray low-energy antiproton spectrum with the first BESS-Polar Antarctic flight

Author

Abe, K., Fuke, H., Haino, S., Hams, T., Itazaki, A., Kim, K. C., Kumazawa, T., Lee, M. H., Makida, Y., Matsuda, S., Matsumoto, K., Mitchell, J. W., Moiseev, A. A., Myers, Z., Nishimura, J., Nozaki, M., Orito, R., Ormes, J. F., Sasaki, M., Seo, E. S., Shikaze, Y., Streitmatter, R. E., Suzuki, J., Takasugi, Y., Takeuchi, K., Tanaka, K., Yamagami, T., Yamamoto, A., Yoshida, T., Yoshimura, K., Abe, K., Fuke, H., Haino, S., Hams, T., Itazaki, A., Kim, K. C., Kumazawa, T., Lee, M. H., Makida, Y., Matsuda, S., Matsumoto, K., Mitchell, J. W., Moiseev, A. A., Myers, Z., Nishimura, J., Nozaki, M., Orito, R., Ormes, J. F., Sasaki, M., Seo, E. S., Shikaze, Y., Streitmatter, R. E., Suzuki, J., Takasugi, Y., Takeuchi, K., Tanaka, K., Yamagami, T., Yamamoto, A., Yoshida, T., and Yoshimura, K.

Abstract

The BESS-Polar spectrometer had its first successful balloon flight over Antarctica in December 2004. During the 8.5-day long-duration flight, almost 0.9 billion events were recorded and 1,520 antiprotons were detected in the energy range 0.1-4.2 GeV. In this paper, we report the antiproton spectrum obtained, discuss the origin of cosmic-ray antiprotons, and use antiprotons to probe the effect of charge sign dependent drift in the solar modulation., Comment: 18 pages, 1 table, 5 figures, submitted to Physics Letters B

Published
2008
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12. Measurements of 0.2 to 20 GeV/n cosmic-ray proton and helium spectra from 1997 through 2002 with the BESS spectrometer

Author

Shikaze, Y., Haino, S., Abe, K., Fuke, H., Hams, T., Kim, K. C., Makida, Y., Matsuda, S., Mitchell, J. W., Moiseev, A. A., Nishimura, J., Nozaki, M., Orito, S., Ormes, J. F., Sanuki, T., Sasaki, M., Seo, E. S., Streitmatter, R. E., Suzuki, J., Tanaka, K., Yamagami, T., Yamamoto, A., Yoshida, T., Yoshimura, K., Shikaze, Y., Haino, S., Abe, K., Fuke, H., Hams, T., Kim, K. C., Makida, Y., Matsuda, S., Mitchell, J. W., Moiseev, A. A., Nishimura, J., Nozaki, M., Orito, S., Ormes, J. F., Sanuki, T., Sasaki, M., Seo, E. S., Streitmatter, R. E., Suzuki, J., Tanaka, K., Yamagami, T., Yamamoto, A., Yoshida, T., and Yoshimura, K.

Abstract

We measured low energy cosmic-ray proton and helium spectra in the kinetic energy range 0.215 - 21.5 GeV/n at different solar activities during a period from 1997 to 2002. The observations were carried out with the BESS spectrometer launched on a balloon at Lynn Lake, Canada. A calculation for the correction of secondary particle backgrounds from the overlying atmosphere was improved by using the measured spectra at small atmospheric depths ranging from 5 through 37 g/cm^2. The uncertainties including statistical and systematic errors of the obtained spectra at the top of atmosphere are 5-7 % for protons and 6-9 % for helium nuclei in the energy range 0.5 - 5 GeV/n., Comment: 27 pages, 7 Tables, 9 figures, Submitted to Astroparticle Physics

Published
2006
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13. Measurements of 0.2 to 20 GeV/n cosmic-ray proton and helium spectra from 1997 through 2002 with the BESS spectrometer

Author

Shikaze, Y., Haino, S., Abe, K., Fuke, H., Hams, T., Kim, K. C., Makida, Y., Matsuda, S., Mitchell, J. W., Moiseev, A. A., Nishimura, J., Nozaki, M., Orito, S., Ormes, J. F., Sanuki, T., Sasaki, M., Seo, E. S., Streitmatter, R. E., Suzuki, J., Tanaka, K., Yamagami, T., Yamamoto, A., Yoshida, T., Yoshimura, K., Shikaze, Y., Haino, S., Abe, K., Fuke, H., Hams, T., Kim, K. C., Makida, Y., Matsuda, S., Mitchell, J. W., Moiseev, A. A., Nishimura, J., Nozaki, M., Orito, S., Ormes, J. F., Sanuki, T., Sasaki, M., Seo, E. S., Streitmatter, R. E., Suzuki, J., Tanaka, K., Yamagami, T., Yamamoto, A., Yoshida, T., and Yoshimura, K.

Abstract

We measured low energy cosmic-ray proton and helium spectra in the kinetic energy range 0.215 - 21.5 GeV/n at different solar activities during a period from 1997 to 2002. The observations were carried out with the BESS spectrometer launched on a balloon at Lynn Lake, Canada. A calculation for the correction of secondary particle backgrounds from the overlying atmosphere was improved by using the measured spectra at small atmospheric depths ranging from 5 through 37 g/cm^2. The uncertainties including statistical and systematic errors of the obtained spectra at the top of atmosphere are 5-7 % for protons and 6-9 % for helium nuclei in the energy range 0.5 - 5 GeV/n., Comment: 27 pages, 7 Tables, 9 figures, Submitted to Astroparticle Physics

Published
2006
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14. Measurements of Atmospheric Antiprotons

Author

Yamato, K., Abe, K., Fuke, H., Haino, S., Makida, Y., Matsuda, S., Matsumoto, H., Mitchell, J. W., Moiseev, A. A., Nishimura, J., Nozaki, M., Orito, S., Ormes, J. F., Sanuki, T., Sasaki, M., Seo, E. S., Shikaze, Y., Streitmatter, R. E., Suzuki, J., Tanaka, K., Yamagami, T., Yamamoto, A., Yoshida, T., Yoshimura, K., Yamato, K., Abe, K., Fuke, H., Haino, S., Makida, Y., Matsuda, S., Matsumoto, H., Mitchell, J. W., Moiseev, A. A., Nishimura, J., Nozaki, M., Orito, S., Ormes, J. F., Sanuki, T., Sasaki, M., Seo, E. S., Shikaze, Y., Streitmatter, R. E., Suzuki, J., Tanaka, K., Yamagami, T., Yamamoto, A., Yoshida, T., and Yoshimura, K.

Abstract

We measured atmospheric antiproton spectra in the energy range 0.2 to 3.4 GeV, at sea level and at balloon altitude in the atmospheric depth range 4.5 to 26 g/cm^2. The observed energy spectra, including our previous measurements at mountain altitude, were compared with estimated spectra calculated on various assumptions regarding the energy distribution of antiprotons that interacted with air nuclei., Comment: Accepted for publication in PLB

Published
2005
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15. Search for Cosmic-Ray Antideuterons

Author

Fuke, H., Maeno, T., Abe, K., Haino, S., Makida, Y., Matsuda, S., Matsumoto, H., Mitchell, J. W., Moiseev, A. A., Nishimura, J., Nozaki, M., Orito, S., Ormes, J. F., Sasaki, M., Seo, E. S., Shikaze, Y., Streitmatter, R. E., Suzuki, J., Tanaka, K., Tanizaki, K., Yamagami, T., Yamamoto, A., Yamamoto, Y., Yamato, K., Yoshida, T., Yoshimura, K., Fuke, H., Maeno, T., Abe, K., Haino, S., Makida, Y., Matsuda, S., Matsumoto, H., Mitchell, J. W., Moiseev, A. A., Nishimura, J., Nozaki, M., Orito, S., Ormes, J. F., Sasaki, M., Seo, E. S., Shikaze, Y., Streitmatter, R. E., Suzuki, J., Tanaka, K., Tanizaki, K., Yamagami, T., Yamamoto, A., Yamamoto, Y., Yamato, K., Yoshida, T., and Yoshimura, K.

Abstract

We performed a search for cosmic-ray antideuterons using data collected during four BESS balloon flights from 1997 to 2000. No candidate was found. We derived, for the first time, an upper limit of 1.9E-4 (m^2 s sr GeV/nucleon)^(-1) for the differential flux of cosmic-ray antideuterons, at the 95% confidence level, between 0.17 and 1.15 GeV/nucleon at the top of the atmosphere., Comment: 4 pages, 3 figures, submitted to Phys. Rev. Lett

Published
2005
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16. Search for Cosmic-Ray Antideuterons

Author

Fuke, H., Maeno, T., Abe, K., Haino, S., Makida, Y., Matsuda, S., Matsumoto, H., Mitchell, J. W., Moiseev, A. A., Nishimura, J., Nozaki, M., Orito, S., Ormes, J. F., Sasaki, M., Seo, E. S., Shikaze, Y., Streitmatter, R. E., Suzuki, J., Tanaka, K., Tanizaki, K., Yamagami, T., Yamamoto, A., Yamamoto, Y., Yamato, K., Yoshida, T., Yoshimura, K., Fuke, H., Maeno, T., Abe, K., Haino, S., Makida, Y., Matsuda, S., Matsumoto, H., Mitchell, J. W., Moiseev, A. A., Nishimura, J., Nozaki, M., Orito, S., Ormes, J. F., Sasaki, M., Seo, E. S., Shikaze, Y., Streitmatter, R. E., Suzuki, J., Tanaka, K., Tanizaki, K., Yamagami, T., Yamamoto, A., Yamamoto, Y., Yamato, K., Yoshida, T., and Yoshimura, K.

Abstract

We performed a search for cosmic-ray antideuterons using data collected during four BESS balloon flights from 1997 to 2000. No candidate was found. We derived, for the first time, an upper limit of 1.9E-4 (m^2 s sr GeV/nucleon)^(-1) for the differential flux of cosmic-ray antideuterons, at the 95% confidence level, between 0.17 and 1.15 GeV/nucleon at the top of the atmosphere., Comment: 4 pages, 3 figures, submitted to Phys. Rev. Lett

Published
2005
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17. Measurements of Atmospheric Antiprotons

Author

Yamato, K., Abe, K., Fuke, H., Haino, S., Makida, Y., Matsuda, S., Matsumoto, H., Mitchell, J. W., Moiseev, A. A., Nishimura, J., Nozaki, M., Orito, S., Ormes, J. F., Sanuki, T., Sasaki, M., Seo, E. S., Shikaze, Y., Streitmatter, R. E., Suzuki, J., Tanaka, K., Yamagami, T., Yamamoto, A., Yoshida, T., Yoshimura, K., Yamato, K., Abe, K., Fuke, H., Haino, S., Makida, Y., Matsuda, S., Matsumoto, H., Mitchell, J. W., Moiseev, A. A., Nishimura, J., Nozaki, M., Orito, S., Ormes, J. F., Sanuki, T., Sasaki, M., Seo, E. S., Shikaze, Y., Streitmatter, R. E., Suzuki, J., Tanaka, K., Yamagami, T., Yamamoto, A., Yoshida, T., and Yoshimura, K.

Abstract

We measured atmospheric antiproton spectra in the energy range 0.2 to 3.4 GeV, at sea level and at balloon altitude in the atmospheric depth range 4.5 to 26 g/cm^2. The observed energy spectra, including our previous measurements at mountain altitude, were compared with estimated spectra calculated on various assumptions regarding the energy distribution of antiprotons that interacted with air nuclei., Comment: Accepted for publication in PLB

Published
2005
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18. Measurements of Primary and Atmospheric Cosmic-Ray Spectra with the BESS-TeV Spectrometer

Author

Haino, S., Sanuki, T., Abe, K., Anraku, K., Asaoka, Y., Fuke, H., Imori, M., Itasaki, A., Maeno, T., Makida, Y., Matsuda, S., Matsui, N., Matsumoto, H., Mitchell, J. W., Moiseev, A. A., Nishimura, J., Nozaki, M., Orito, S., Ormes, J. F., Sasaki, M., Seo, E. S., Shikaze, Y., Streitmatter, R. E., Suzuki, J., Takasugi, Y., Tanaka, K., Tanizaki, K., Yamagami, T., Yamamoto, A., Yamamoto, Y., Yamato, K., Yoshida, T., Yoshimura, K., Haino, S., Sanuki, T., Abe, K., Anraku, K., Asaoka, Y., Fuke, H., Imori, M., Itasaki, A., Maeno, T., Makida, Y., Matsuda, S., Matsui, N., Matsumoto, H., Mitchell, J. W., Moiseev, A. A., Nishimura, J., Nozaki, M., Orito, S., Ormes, J. F., Sasaki, M., Seo, E. S., Shikaze, Y., Streitmatter, R. E., Suzuki, J., Takasugi, Y., Tanaka, K., Tanizaki, K., Yamagami, T., Yamamoto, A., Yamamoto, Y., Yamato, K., Yoshida, T., and Yoshimura, K.

Abstract

Primary and atmospheric cosmic-ray spectra were precisely measured with the BESS-TeV spectrometer. The spectrometer was upgraded from BESS-98 to achieve seven times higher resolution in momentum measurement. We report absolute fluxes of primary protons and helium nuclei in the energy ranges, 1-540 GeV and 1-250 GeV/n, respectively, and absolute flux of atmospheric muons in the momentum range 0.6-400 GeV/c., Comment: 26 pages, 9 figures, 3 tables, Submitted to Phys. Lett. B

Published
2004
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19. Measurements of Primary and Atmospheric Cosmic-Ray Spectra with the BESS-TeV Spectrometer

Author

Haino, S., Sanuki, T., Abe, K., Anraku, K., Asaoka, Y., Fuke, H., Imori, M., Itasaki, A., Maeno, T., Makida, Y., Matsuda, S., Matsui, N., Matsumoto, H., Mitchell, J. W., Moiseev, A. A., Nishimura, J., Nozaki, M., Orito, S., Ormes, J. F., Sasaki, M., Seo, E. S., Shikaze, Y., Streitmatter, R. E., Suzuki, J., Takasugi, Y., Tanaka, K., Tanizaki, K., Yamagami, T., Yamamoto, A., Yamamoto, Y., Yamato, K., Yoshida, T., Yoshimura, K., Haino, S., Sanuki, T., Abe, K., Anraku, K., Asaoka, Y., Fuke, H., Imori, M., Itasaki, A., Maeno, T., Makida, Y., Matsuda, S., Matsui, N., Matsumoto, H., Mitchell, J. W., Moiseev, A. A., Nishimura, J., Nozaki, M., Orito, S., Ormes, J. F., Sasaki, M., Seo, E. S., Shikaze, Y., Streitmatter, R. E., Suzuki, J., Takasugi, Y., Tanaka, K., Tanizaki, K., Yamagami, T., Yamamoto, A., Yamamoto, Y., Yamato, K., Yoshida, T., and Yoshimura, K.

Abstract

Primary and atmospheric cosmic-ray spectra were precisely measured with the BESS-TeV spectrometer. The spectrometer was upgraded from BESS-98 to achieve seven times higher resolution in momentum measurement. We report absolute fluxes of primary protons and helium nuclei in the energy ranges, 1-540 GeV and 1-250 GeV/n, respectively, and absolute flux of atmospheric muons in the momentum range 0.6-400 GeV/c., Comment: 26 pages, 9 figures, 3 tables, Submitted to Phys. Lett. B

Published
2004
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20. Measurements of Proton, Helium and Muon Spectra at Small Atmospheric Depths with the BESS Spectrometer

Author

Abe, K., Sanuki, T., Anraku, K., Asaoka, Y., Fuke, H., Haino, S., Ikeda, N., Imori, M., Izumi, K., Maeno, T., Makida, Y., Matsuda, S., Matsui, N., Matsukawa, T., Matsumoto, H., Mitchell, J. W., Moiseev, A. A., Nishimura, J., Nozaki, M., Orito, S., Ormes, J. F., Sasaki, M., Seo, E. S., Shikaze, Y., Sonoda, T., Streitmatter, R. E., Suzuki, J., Tanaka, K., Tanizaki, K., Yamagami, T., Yamamoto, A., Yamamoto, Y., Yamato, K., Yoshida, T., Yoshimura, K., Abe, K., Sanuki, T., Anraku, K., Asaoka, Y., Fuke, H., Haino, S., Ikeda, N., Imori, M., Izumi, K., Maeno, T., Makida, Y., Matsuda, S., Matsui, N., Matsukawa, T., Matsumoto, H., Mitchell, J. W., Moiseev, A. A., Nishimura, J., Nozaki, M., Orito, S., Ormes, J. F., Sasaki, M., Seo, E. S., Shikaze, Y., Sonoda, T., Streitmatter, R. E., Suzuki, J., Tanaka, K., Tanizaki, K., Yamagami, T., Yamamoto, A., Yamamoto, Y., Yamato, K., Yoshida, T., and Yoshimura, K.

Abstract

The cosmic-ray proton, helium, and muon spectra at small atmospheric depths of 4.5 -- 28 g/cm^2 were precisely measured during the slow descending period of the BESS-2001 balloon flight. The variation of atmospheric secondary particle fluxes as a function of atmospheric depth provides fundamental information to study hadronic interactions of the primary cosmic rays with the atmosphere., Comment: 21 pages, 11 figures, 4 tables

Published
2003
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21. Measurements of Proton, Helium and Muon Spectra at Small Atmospheric Depths with the BESS Spectrometer

Author

Abe, K., Sanuki, T., Anraku, K., Asaoka, Y., Fuke, H., Haino, S., Ikeda, N., Imori, M., Izumi, K., Maeno, T., Makida, Y., Matsuda, S., Matsui, N., Matsukawa, T., Matsumoto, H., Mitchell, J. W., Moiseev, A. A., Nishimura, J., Nozaki, M., Orito, S., Ormes, J. F., Sasaki, M., Seo, E. S., Shikaze, Y., Sonoda, T., Streitmatter, R. E., Suzuki, J., Tanaka, K., Tanizaki, K., Yamagami, T., Yamamoto, A., Yamamoto, Y., Yamato, K., Yoshida, T., Yoshimura, K., Abe, K., Sanuki, T., Anraku, K., Asaoka, Y., Fuke, H., Haino, S., Ikeda, N., Imori, M., Izumi, K., Maeno, T., Makida, Y., Matsuda, S., Matsui, N., Matsukawa, T., Matsumoto, H., Mitchell, J. W., Moiseev, A. A., Nishimura, J., Nozaki, M., Orito, S., Ormes, J. F., Sasaki, M., Seo, E. S., Shikaze, Y., Sonoda, T., Streitmatter, R. E., Suzuki, J., Tanaka, K., Tanizaki, K., Yamagami, T., Yamamoto, A., Yamamoto, Y., Yamato, K., Yoshida, T., and Yoshimura, K.

Abstract

The cosmic-ray proton, helium, and muon spectra at small atmospheric depths of 4.5 -- 28 g/cm^2 were precisely measured during the slow descending period of the BESS-2001 balloon flight. The variation of atmospheric secondary particle fluxes as a function of atmospheric depth provides fundamental information to study hadronic interactions of the primary cosmic rays with the atmosphere., Comment: 21 pages, 11 figures, 4 tables

Published
2003
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22. Precise Measurements of Atmospheric Muon Fluxes with the BESS Spectrometer

Author

Motoki, M., Sanuki, T., Orito, S., Abe, K., Anraku, K., Asaoka, Y., Fujikawa, M., Fuke, H., Haino, S., Imori, M., Izumi, K., Maeno, T., Makida, Y., Matsui, N., Matsumoto, H., Matsunaga, H., Mitchell, J., Mitsui, T., Moiseev, A., Nishimura, J., Nozaki, M., Ormes, J., Saeki, T., Sasaki, M., Seo, E. S., Shikaze, Y., Sonoda, T., Streitmatter, R., Suzuki, J., Tanaka, K., Ueda, I., Wang, J. Z., Yajima, N., Yamagami, T., Yamamoto, A., Yamamoto, Y., Yamato, K., Yoshida, T., Yoshimura, K., Motoki, M., Sanuki, T., Orito, S., Abe, K., Anraku, K., Asaoka, Y., Fujikawa, M., Fuke, H., Haino, S., Imori, M., Izumi, K., Maeno, T., Makida, Y., Matsui, N., Matsumoto, H., Matsunaga, H., Mitchell, J., Mitsui, T., Moiseev, A., Nishimura, J., Nozaki, M., Ormes, J., Saeki, T., Sasaki, M., Seo, E. S., Shikaze, Y., Sonoda, T., Streitmatter, R., Suzuki, J., Tanaka, K., Ueda, I., Wang, J. Z., Yajima, N., Yamagami, T., Yamamoto, A., Yamamoto, Y., Yamato, K., Yoshida, T., and Yoshimura, K.

Abstract

The vertical absolute fluxes of atmospheric muons and muon charge ratio have been measured precisely at different geomagnetic locations by using the BESS spectrometer. The observations had been performed at sea level (30 m above sea level) in Tsukuba, Japan, and at 360 m above sea level in Lynn Lake, Canada. The vertical cutoff rigidities in Tsukuba (36.2 N, 140.1 E) and in Lynn Lake (56.5 N, 101.0 W) are 11.4 GV and 0.4 GV, respectively. We have obtained vertical fluxes of positive and negative muons in a momentum range from 0.6 to 20 GeV/c with systematic errors less than 3 % in both measurements. By comparing the data collected at two different geomagnetic latitudes, we have seen an effect of cutoff rigidity. The dependence on the atmospheric pressure and temperature, and the solar modulation effect have been also clearly observed. We also clearly observed the decrease of charge ratio of muons at low momentum side with at higher cutoff rigidity region., Comment: 35 pages, 9 figures. Submitted to Astroparticle Physics

Published
2002
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23. Atmospheric gamma-ray observation with the BETS detectorfor calibrating atmospheric neutrino flux calculations

Author

Kasahara, K., Mochizuki, E., Torii, S., Tamura, T., Tateyama, N., Yoshida, K., Yamagami, T., Saito, Y., Nishimura, J., Murakami, H., Kobayashi, T., Komori, Y., Honda, M., Ohuchi, T., Midorikawa, S., Yuda, T., Kasahara, K., Mochizuki, E., Torii, S., Tamura, T., Tateyama, N., Yoshida, K., Yamagami, T., Saito, Y., Nishimura, J., Murakami, H., Kobayashi, T., Komori, Y., Honda, M., Ohuchi, T., Midorikawa, S., and Yuda, T.

Abstract

We observed atmospheric gamma-rays around 10 GeV at balloon altitudes (15~25 km) and at a mountain (2770 m a.s.l). The observed results were compared with Monte Carlo calculations to find that an interaction model (Lund Fritiof1.6) used in an old neutrino flux calculation was not good enough for describing the observed values. In stead, we found that two other nuclear interaction models, Lund Fritiof7.02 and dpmjet3.03, gave much better agreement with the observations. Our data will serve for examining nuclear interaction models and for deriving a reliable absolute atmospheric neutrino flux in the GeV region., Comment: 9 pages 12 figures

Published
2002
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24. Atmospheric gamma-ray observation with the BETS detectorfor calibrating atmospheric neutrino flux calculations

Author

Kasahara, K., Mochizuki, E., Torii, S., Tamura, T., Tateyama, N., Yoshida, K., Yamagami, T., Saito, Y., Nishimura, J., Murakami, H., Kobayashi, T., Komori, Y., Honda, M., Ohuchi, T., Midorikawa, S., Yuda, T., Kasahara, K., Mochizuki, E., Torii, S., Tamura, T., Tateyama, N., Yoshida, K., Yamagami, T., Saito, Y., Nishimura, J., Murakami, H., Kobayashi, T., Komori, Y., Honda, M., Ohuchi, T., Midorikawa, S., and Yuda, T.

Abstract

We observed atmospheric gamma-rays around 10 GeV at balloon altitudes (15~25 km) and at a mountain (2770 m a.s.l). The observed results were compared with Monte Carlo calculations to find that an interaction model (Lund Fritiof1.6) used in an old neutrino flux calculation was not good enough for describing the observed values. In stead, we found that two other nuclear interaction models, Lund Fritiof7.02 and dpmjet3.03, gave much better agreement with the observations. Our data will serve for examining nuclear interaction models and for deriving a reliable absolute atmospheric neutrino flux in the GeV region., Comment: 9 pages 12 figures

Published
2002
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25. Precise Measurements of Atmospheric Muon Fluxes with the BESS Spectrometer

Author

Motoki, M., Sanuki, T., Orito, S., Abe, K., Anraku, K., Asaoka, Y., Fujikawa, M., Fuke, H., Haino, S., Imori, M., Izumi, K., Maeno, T., Makida, Y., Matsui, N., Matsumoto, H., Matsunaga, H., Mitchell, J., Mitsui, T., Moiseev, A., Nishimura, J., Nozaki, M., Ormes, J., Saeki, T., Sasaki, M., Seo, E. S., Shikaze, Y., Sonoda, T., Streitmatter, R., Suzuki, J., Tanaka, K., Ueda, I., Wang, J. Z., Yajima, N., Yamagami, T., Yamamoto, A., Yamamoto, Y., Yamato, K., Yoshida, T., Yoshimura, K., Motoki, M., Sanuki, T., Orito, S., Abe, K., Anraku, K., Asaoka, Y., Fujikawa, M., Fuke, H., Haino, S., Imori, M., Izumi, K., Maeno, T., Makida, Y., Matsui, N., Matsumoto, H., Matsunaga, H., Mitchell, J., Mitsui, T., Moiseev, A., Nishimura, J., Nozaki, M., Ormes, J., Saeki, T., Sasaki, M., Seo, E. S., Shikaze, Y., Sonoda, T., Streitmatter, R., Suzuki, J., Tanaka, K., Ueda, I., Wang, J. Z., Yajima, N., Yamagami, T., Yamamoto, A., Yamamoto, Y., Yamato, K., Yoshida, T., and Yoshimura, K.

Abstract

The vertical absolute fluxes of atmospheric muons and muon charge ratio have been measured precisely at different geomagnetic locations by using the BESS spectrometer. The observations had been performed at sea level (30 m above sea level) in Tsukuba, Japan, and at 360 m above sea level in Lynn Lake, Canada. The vertical cutoff rigidities in Tsukuba (36.2 N, 140.1 E) and in Lynn Lake (56.5 N, 101.0 W) are 11.4 GV and 0.4 GV, respectively. We have obtained vertical fluxes of positive and negative muons in a momentum range from 0.6 to 20 GeV/c with systematic errors less than 3 % in both measurements. By comparing the data collected at two different geomagnetic latitudes, we have seen an effect of cutoff rigidity. The dependence on the atmospheric pressure and temperature, and the solar modulation effect have been also clearly observed. We also clearly observed the decrease of charge ratio of muons at low momentum side with at higher cutoff rigidity region., Comment: 35 pages, 9 figures. Submitted to Astroparticle Physics

Published
2002
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26. ASCA Detection of Pulsed X-ray Emission from PSR J0631+1036

Author

Torii, Ken'ichi, Saito, Y., Nagase, F., Yamagami, T., Kamae, T., Hirayama, M., Kawai, N., Sakurai, I., Namiki, M., Shibata, S., Gunji, S., Finley, J. P., Torii, Ken'ichi, Saito, Y., Nagase, F., Yamagami, T., Kamae, T., Hirayama, M., Kawai, N., Sakurai, I., Namiki, M., Shibata, S., Gunji, S., and Finley, J. P.

Abstract

ASCA's long look at the 288 millisecond radio pulsar, PSR J0631+1036, reveals coherent X-ray pulsation from this source for the first time. The source was first detected in the serendipitous Einstein observation and later identified as a radio pulsar. Possible pulsation in the gamma-ray band has been detected from the CGRO EGRET data (Zepka, et al. 1996). The X-ray spectrum in the ASCA band is characterized by a hard power-law type emission with a photon index of about 2.3, when fitted with a single power-law function modified with absorption. An additional blackbody component of about 0.14 keV increases the quality of the spectral fit. The observed X-ray flux is 2.1e-13 ergs/s/cm2 in the 1-10 keV band. We find that many characteristics of PSR J0631+1036 are similar to those of middle-aged gamma-ray pulsars such as PSR B1055-52, PSR B0633+17 (Geminga), and PSR B0656+14., Comment: To appear in ApJ Letters

Published
2001
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27. ASCA Detection of Pulsed X-ray Emission from PSR J0631+1036

Author

Torii, Ken'ichi, Saito, Y., Nagase, F., Yamagami, T., Kamae, T., Hirayama, M., Kawai, N., Sakurai, I., Namiki, M., Shibata, S., Gunji, S., Finley, J. P., Torii, Ken'ichi, Saito, Y., Nagase, F., Yamagami, T., Kamae, T., Hirayama, M., Kawai, N., Sakurai, I., Namiki, M., Shibata, S., Gunji, S., and Finley, J. P.

Abstract

ASCA's long look at the 288 millisecond radio pulsar, PSR J0631+1036, reveals coherent X-ray pulsation from this source for the first time. The source was first detected in the serendipitous Einstein observation and later identified as a radio pulsar. Possible pulsation in the gamma-ray band has been detected from the CGRO EGRET data (Zepka, et al. 1996). The X-ray spectrum in the ASCA band is characterized by a hard power-law type emission with a photon index of about 2.3, when fitted with a single power-law function modified with absorption. An additional blackbody component of about 0.14 keV increases the quality of the spectral fit. The observed X-ray flux is 2.1e-13 ergs/s/cm2 in the 1-10 keV band. We find that many characteristics of PSR J0631+1036 are similar to those of middle-aged gamma-ray pulsars such as PSR B1055-52, PSR B0633+17 (Geminga), and PSR B0656+14., Comment: To appear in ApJ Letters

Published
2001
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28. Precise Measurement of Cosmic-Ray Proton and Helium Spectra with the BESS Spectrometer

Author

Sanuki, T., Motoki, M., Matsumoto, H., Seo, E. S., Wang, J. Z., Abe, K., Anraku, K., Asaoka, Y., Fujikawa, M., Imori, M., Maeno, T., Makida, Y., Matsui, N., Matsunaga, H., Mitchell, J., Mitsui, T., Moiseev, A., Nishimura, J., Nozaki, M., Orito, S., Ormes, J., Saeki, T., Sasaki, M., Shikaze, Y., Sonoda, T., Streitmatter, R., Suzuki, J., Tanaka, K., Ueda, I., Yajima, N., Yamagami, T., Yamamoto, A., Yoshida, T., Yoshimura, K., Sanuki, T., Motoki, M., Matsumoto, H., Seo, E. S., Wang, J. Z., Abe, K., Anraku, K., Asaoka, Y., Fujikawa, M., Imori, M., Maeno, T., Makida, Y., Matsui, N., Matsunaga, H., Mitchell, J., Mitsui, T., Moiseev, A., Nishimura, J., Nozaki, M., Orito, S., Ormes, J., Saeki, T., Sasaki, M., Shikaze, Y., Sonoda, T., Streitmatter, R., Suzuki, J., Tanaka, K., Ueda, I., Yajima, N., Yamagami, T., Yamamoto, A., Yoshida, T., and Yoshimura, K.

Abstract

We report cosmic-ray proton and helium spectra in energy ranges of 1 to 120 GeV and 1 to 54 GeV/nucleon, respectively, measured by a balloon flight of the BESS spectrometer in 1998. The magnetic-rigidity of the cosmic-rays was reliably determined by highly precise measurement of the circular track in a uniform solenoidal magnetic field of 1 Tesla. Those spectra were determined within overall uncertainties of +-5 % for protons and +- 10 % for helium nuclei including statistical and systematic errors., Comment: 12 pages, 4 figures

Published
2000
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29. Precise Measurement of Cosmic-Ray Proton and Helium Spectra with the BESS Spectrometer

Author

Sanuki, T., Motoki, M., Matsumoto, H., Seo, E. S., Wang, J. Z., Abe, K., Anraku, K., Asaoka, Y., Fujikawa, M., Imori, M., Maeno, T., Makida, Y., Matsui, N., Matsunaga, H., Mitchell, J., Mitsui, T., Moiseev, A., Nishimura, J., Nozaki, M., Orito, S., Ormes, J., Saeki, T., Sasaki, M., Shikaze, Y., Sonoda, T., Streitmatter, R., Suzuki, J., Tanaka, K., Ueda, I., Yajima, N., Yamagami, T., Yamamoto, A., Yoshida, T., Yoshimura, K., Sanuki, T., Motoki, M., Matsumoto, H., Seo, E. S., Wang, J. Z., Abe, K., Anraku, K., Asaoka, Y., Fujikawa, M., Imori, M., Maeno, T., Makida, Y., Matsui, N., Matsunaga, H., Mitchell, J., Mitsui, T., Moiseev, A., Nishimura, J., Nozaki, M., Orito, S., Ormes, J., Saeki, T., Sasaki, M., Shikaze, Y., Sonoda, T., Streitmatter, R., Suzuki, J., Tanaka, K., Ueda, I., Yajima, N., Yamagami, T., Yamamoto, A., Yoshida, T., and Yoshimura, K.

Abstract

We report cosmic-ray proton and helium spectra in energy ranges of 1 to 120 GeV and 1 to 54 GeV/nucleon, respectively, measured by a balloon flight of the BESS spectrometer in 1998. The magnetic-rigidity of the cosmic-rays was reliably determined by highly precise measurement of the circular track in a uniform solenoidal magnetic field of 1 Tesla. Those spectra were determined within overall uncertainties of +-5 % for protons and +- 10 % for helium nuclei including statistical and systematic errors., Comment: 12 pages, 4 figures

Published
2000
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35. Precision Measurement of Cosmic-Ray Antiproton Spectrum

Author

Orito, S., Maeno, T., Matsunaga, H., Abe, K., Anraku, K., Asaoka, Y., Fujikawa, M., Imori, M., Ishino, M., Makida, Y., Matsui, N., Matsumoto, H., Mitchell, J., Mitsui, T., Moiseev, A., Motoki, M., Nishimura, J., Nozaki, M., Ormes, J., Saeki, T., Sanuki, T., Sasaki, M., Seo, E. S., Shikaze, Y., Sonoda, T., Streitmatter, R., Suzuki, J., Tanaka, K., Ueda, I., Yajima, N., Yamagami, T., Yamamoto, A., Yoshida, T., Yoshimura, K., Orito, S., Maeno, T., Matsunaga, H., Abe, K., Anraku, K., Asaoka, Y., Fujikawa, M., Imori, M., Ishino, M., Makida, Y., Matsui, N., Matsumoto, H., Mitchell, J., Mitsui, T., Moiseev, A., Motoki, M., Nishimura, J., Nozaki, M., Ormes, J., Saeki, T., Sanuki, T., Sasaki, M., Seo, E. S., Shikaze, Y., Sonoda, T., Streitmatter, R., Suzuki, J., Tanaka, K., Ueda, I., Yajima, N., Yamagami, T., Yamamoto, A., Yoshida, T., and Yoshimura, K.

Abstract

The energy spectrum of cosmic-ray antiprotons has been measured in the range 0.18 to 3.56 GeV, based on 458 antiprotons collected by BESS in recent solar-minimum period. We have detected for the first time a distinctive peak at 2 GeV of antiprotons originating from cosmic-ray interactions with the interstellar gas. The peak spectrum is reproduced by theoretical calculations, implying that the propagation models are basically correct and that different cosmic-ray species undergo a universal propagation. Future BESS flights toward the solar maximum will help us to study the solar modulation and the propagation in detail and to search for primary antiproton components., Comment: REVTeX, 4 pages including 4 eps figures

Published
1999
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37. Precision Measurement of Cosmic-Ray Antiproton Spectrum

Author

Orito, S., Maeno, T., Matsunaga, H., Abe, K., Anraku, K., Asaoka, Y., Fujikawa, M., Imori, M., Ishino, M., Makida, Y., Matsui, N., Matsumoto, H., Mitchell, J., Mitsui, T., Moiseev, A., Motoki, M., Nishimura, J., Nozaki, M., Ormes, J., Saeki, T., Sanuki, T., Sasaki, M., Seo, E. S., Shikaze, Y., Sonoda, T., Streitmatter, R., Suzuki, J., Tanaka, K., Ueda, I., Yajima, N., Yamagami, T., Yamamoto, A., Yoshida, T., Yoshimura, K., Orito, S., Maeno, T., Matsunaga, H., Abe, K., Anraku, K., Asaoka, Y., Fujikawa, M., Imori, M., Ishino, M., Makida, Y., Matsui, N., Matsumoto, H., Mitchell, J., Mitsui, T., Moiseev, A., Motoki, M., Nishimura, J., Nozaki, M., Ormes, J., Saeki, T., Sanuki, T., Sasaki, M., Seo, E. S., Shikaze, Y., Sonoda, T., Streitmatter, R., Suzuki, J., Tanaka, K., Ueda, I., Yajima, N., Yamagami, T., Yamamoto, A., Yoshida, T., and Yoshimura, K.

Abstract

The energy spectrum of cosmic-ray antiprotons has been measured in the range 0.18 to 3.56 GeV, based on 458 antiprotons collected by BESS in recent solar-minimum period. We have detected for the first time a distinctive peak at 2 GeV of antiprotons originating from cosmic-ray interactions with the interstellar gas. The peak spectrum is reproduced by theoretical calculations, implying that the propagation models are basically correct and that different cosmic-ray species undergo a universal propagation. Future BESS flights toward the solar maximum will help us to study the solar modulation and the propagation in detail and to search for primary antiproton components., Comment: REVTeX, 4 pages including 4 eps figures

Published
1999
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38. Measurement of Low-Energy Cosmic-Ray Antiprotons at Solar Minimum

Author

Matsunaga, H., Orito, S., Matsumoto, H., Yoshimura, K., Moiseev, A., Anraku, K., Golden, R., Imori, M., Makida, Y., Mitchell, J., Motoki, M., Nishimura, J., Nozaki, M., Ormes, J., Saeki, T., Sanuki, T., Streitmatter, R., Suzuki, J., Tanaka, K., Ueda, I., Yajima, N., Yamagami, T., Yamamoto, A., Yoshida, T., Matsunaga, H., Orito, S., Matsumoto, H., Yoshimura, K., Moiseev, A., Anraku, K., Golden, R., Imori, M., Makida, Y., Mitchell, J., Motoki, M., Nishimura, J., Nozaki, M., Ormes, J., Saeki, T., Sanuki, T., Streitmatter, R., Suzuki, J., Tanaka, K., Ueda, I., Yajima, N., Yamagami, T., Yamamoto, A., and Yoshida, T.

Abstract

The absolute fluxes of the cosmic-ray antiprotons at solar minimum are measured in the energy range 0.18 to 1.4 GeV, based on 43 events unambiguously detected in BESS '95 data. The resultant energy spectrum appears to be flat below 1 GeV, compatible with a possible admixture of primary antiproton component with a soft energy spectrum, while the possibility of secondary antiprotons alone explaining the data cannot be excluded with the present accuracy. Further improvement of statistical accuracy and extension of the energy range are planned in future BESS flights., Comment: REVTeX, 4 pages including 4 eps figures. Submitted to PRL

Published
1998
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39. Measurement of Low-Energy Cosmic-Ray Antiprotons at Solar Minimum

Author

Matsunaga, H., Orito, S., Matsumoto, H., Yoshimura, K., Moiseev, A., Anraku, K., Golden, R., Imori, M., Makida, Y., Mitchell, J., Motoki, M., Nishimura, J., Nozaki, M., Ormes, J., Saeki, T., Sanuki, T., Streitmatter, R., Suzuki, J., Tanaka, K., Ueda, I., Yajima, N., Yamagami, T., Yamamoto, A., Yoshida, T., Matsunaga, H., Orito, S., Matsumoto, H., Yoshimura, K., Moiseev, A., Anraku, K., Golden, R., Imori, M., Makida, Y., Mitchell, J., Motoki, M., Nishimura, J., Nozaki, M., Ormes, J., Saeki, T., Sanuki, T., Streitmatter, R., Suzuki, J., Tanaka, K., Ueda, I., Yajima, N., Yamagami, T., Yamamoto, A., and Yoshida, T.

Abstract

The absolute fluxes of the cosmic-ray antiprotons at solar minimum are measured in the energy range 0.18 to 1.4 GeV, based on 43 events unambiguously detected in BESS '95 data. The resultant energy spectrum appears to be flat below 1 GeV, compatible with a possible admixture of primary antiproton component with a soft energy spectrum, while the possibility of secondary antiprotons alone explaining the data cannot be excluded with the present accuracy. Further improvement of statistical accuracy and extension of the energy range are planned in future BESS flights., Comment: REVTeX, 4 pages including 4 eps figures. Submitted to PRL

Published
1998
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40. A New Limit on the Flux of Cosmic Antihelium

Author

Saeki, T., Anraku, K., Orito, S., Ormes, J., Imori, M., Kimbell, B., Makida, Y., Matsumoto, H., Matsunaga, H., Mitchell, J., Motoki, M., Nishimura, J., Nozaki, M., Otoba, M., Sanuki, T., Streitmatter, R., Suzuki, J., Tanaka, K., Ueda, I., Yajima, N., Yamagami, T., Yamamoto, A., Yoshida, T., Yoshimura, K., Saeki, T., Anraku, K., Orito, S., Ormes, J., Imori, M., Kimbell, B., Makida, Y., Matsumoto, H., Matsunaga, H., Mitchell, J., Motoki, M., Nishimura, J., Nozaki, M., Otoba, M., Sanuki, T., Streitmatter, R., Suzuki, J., Tanaka, K., Ueda, I., Yajima, N., Yamagami, T., Yamamoto, A., Yoshida, T., and Yoshimura, K.

Abstract

A very sensitive search for cosmic-ray antihelium was performed using data obtained from three scientific flights of BESS magnetic rigidity spectrometer. We have not observed any antihelium; this places a model-independent upper limit (95 % C.L.) on the antihelium flux of 6*10**(-4) m**(-2)sr**(-1)s**(-1) at the top of the atmosphere in the rigidity region 1 to 16 GV, after correcting for the estimated interaction loss of antihelium in the air and in the instrument. The corresponding upper limit on the Hebar/He flux ratio is 3.1*10**(-6), 30 times more stringent than the limits obtained in similar rigidity regions with magnetic spectrometers previous to BESS., Comment: REVTeX, 4 pages (including 5 EPS figures). Submitted to PRL

Published
1997
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41. A New Limit on the Flux of Cosmic Antihelium

Author

Saeki, T., Anraku, K., Orito, S., Ormes, J., Imori, M., Kimbell, B., Makida, Y., Matsumoto, H., Matsunaga, H., Mitchell, J., Motoki, M., Nishimura, J., Nozaki, M., Otoba, M., Sanuki, T., Streitmatter, R., Suzuki, J., Tanaka, K., Ueda, I., Yajima, N., Yamagami, T., Yamamoto, A., Yoshida, T., Yoshimura, K., Saeki, T., Anraku, K., Orito, S., Ormes, J., Imori, M., Kimbell, B., Makida, Y., Matsumoto, H., Matsunaga, H., Mitchell, J., Motoki, M., Nishimura, J., Nozaki, M., Otoba, M., Sanuki, T., Streitmatter, R., Suzuki, J., Tanaka, K., Ueda, I., Yajima, N., Yamagami, T., Yamamoto, A., Yoshida, T., and Yoshimura, K.

Abstract

A very sensitive search for cosmic-ray antihelium was performed using data obtained from three scientific flights of BESS magnetic rigidity spectrometer. We have not observed any antihelium; this places a model-independent upper limit (95 % C.L.) on the antihelium flux of 6*10**(-4) m**(-2)sr**(-1)s**(-1) at the top of the atmosphere in the rigidity region 1 to 16 GV, after correcting for the estimated interaction loss of antihelium in the air and in the instrument. The corresponding upper limit on the Hebar/He flux ratio is 3.1*10**(-6), 30 times more stringent than the limits obtained in similar rigidity regions with magnetic spectrometers previous to BESS., Comment: REVTeX, 4 pages (including 5 EPS figures). Submitted to PRL

Published
1997
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