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242 results on '"Fuke, H."'

1. The Calorimetric Electron Telescope (CALET) on the International Space Station: Results from the first eight years on orbit

Author

Akaike, Y., Adriani, O., Asano, K., Asaoka, Y., Berti, E., Bigongiari, G., Binns, W.R., Bongi, M., Brogi, P., Bruno, A., Cannady, N., Castellini, G., Checchia, C., Cherry, M.L., Collazuol, G., de Nolfo, G.A., Ebisawa, K., Ficklin, A.W., Fuke, H., Gonzi, S., Guzik, T.G., Hams, T., Hibino, K., Ichimura, M., Ishizaki, W., Israel, M.H., Kasahara, K., Kataoka, J., Kataoka, R., Katayose, Y., Kato, C., Kawanaka, N., Kawakubo, Y., Kobayashi, K., Kohri, K., Krawczynski, H.S., Krizmanic, J.F., Maestro, P., Marrocchesi, P.S., Messineo, A.M., Mitchell, J.W., Miyake, S., Moiseev, A.A., Mori, M., Mori, N., Motz, H.M., Munakata, K., Nakahira, S., Nishimura, J., Negro, M., Okuno, S., Ormes, J.F., Ozawa, S., Pacini, L., Papini, P., Rauch, B.F., Ricciarini, S.B., Sakai, K., Sakamoto, T., Sasaki, M., Shimizu, Y., Shiomi, A., Spillantini, P., Stolzi, F., Sugita, S., Sulaj, A., Takita, M., Tamura, T., Terasawa, T., Torii, S., Tsunesada, Y., Uchihori, Y., Vannuccini, E., Wefel, J.P., Yamaoka, K., Yanagita, S., Yoshida, A., Yoshida, K., and Zober, W.V.

Published
2024
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2. Direct measurements of cosmic – Ray iron and nickel with CALET on the International Space Station

Author

Adriani, O., Akaike, Y., Asano, K., Asaoka, Y., Berti, E., Bigongiari, G., Binns, W.R., Bongi, M., Brogi, P., Bruno, A., Cannady, N., Castellini, G., Checchia, C., Cherry, M.L., Collazuol, G., de Nolfo, G.A., Ebisawa, K., Ficklin, A.W., Fuke, H., Gonzi, S., Guzik, T.G., Hams, T., Hibino, K., Ichimura, M., Ioka, K., Ishizaki, W., Israel, M.H., Kasahara, K., Kataoka, J., Kataoka, R., Katayose, Y., Kato, C., Kawanaka, N., Kawakubo, Y., Kobayashi, K., Kohri, K., Krawczynski, H.S., Krizmanic, J.F., Maestro, P., Marrocchesi, P.S., Mattiazzi, M., Messineo, A.M., Mitchell, J.W., Miyake, S., Moiseev, A.A., Mori, M., Mori, N., Motz, H.M., Munakata, K., Nakahira, S., Nishimura, J., Okuno, S., Ormes, J.F., Ozawa, S., Pacini, L., Papini, P., Rauch, B.F., Ricciarini, S.B., Sakai, K., Sakamoto, T., Sasaki, M., Shimizu, Y., Shiomi, A., Spillantini, P., Stolzi, F., Sugita, S., Sulaj, A., Takita, M., Tamura, T., Terasawa, T., Torii, S., Tsunesada, Y., Uchihori, Y., Vannuccini, E., Wefel, J.P., Yamaoka, K., Yanagita, S., Yoshida, A., Yoshida, K., and Zober, W.V.

Published
2024
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3. Sensitivity of the GAPS experiment to low-energy cosmic-ray antiprotons

Author

Rogers, F., Aramaki, T., Boezio, M., Boggs, S.E., Bonvicini, V., Bridges, G., Campana, D., Craig, W.W., von Doetinchem, P., Everson, E., Fabris, L., Feldman, S., Fuke, H., Gahbauer, F., Gerrity, C., Hailey, C.J., Hayashi, T., Kawachi, A., Kozai, M., Lenni, A., Lowell, A., Manghisoni, M., Marcelli, N., Mochizuki, B., Mognet, S.A.I., Munakata, K., Munini, R., Nakagami, Y., Olson, J., Ong, R.A., Osteria, G., Perez, K.M., Quinn, S., Re, V., Riceputi, E., Roach, B., Ryan, J., Saffold, N., Scotti, V., Shimizu, Y., Sparvoli, R., Stoessl, A., Tiberio, A., Vannuccini, E., Wada, T., Xiao, M., Yamatani, M., Yee, K., Yoshida, A., Yoshida, T., Zampa, G., Zeng, J., and Zweerink, J.

Published
2023
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4. Cosmic antihelium-3 nuclei sensitivity of the GAPS experiment

Author

Saffold, N., Aramaki, T., Bird, R., Boezio, M., Boggs, S.E., Bonvicini, V., Campana, D., Craig, W.W., von Doetinchem, P., Everson, E., Fabris, L., Fuke, H., Gahbauer, F., Garcia, I., Gerrity, C., Hailey, C.J., Hayashi, T., Kato, C., Kawachi, A., Kobayashi, S., Kozai, M., Lenni, A., Lowell, A., Manghisoni, M., Marcelli, N., Mognet, S.I., Munakata, K., Munini, R., Nakagami, Y., Olson, J., Ong, R.A., Osteria, G., Perez, K., Pope, I., Quinn, S., Re, V., Reed, M., Riceputi, E., Roach, B., Rogers, F., Ryan, J.L., Scotti, V., Shimizu, Y., Sonzogni, M., Sparvoli, R., Stoessl, A., Tiberio, A., Vannuccini, E., Wada, T., Xiao, M., Yamatani, M., Yoshida, A., Yoshida, T., Zampa, G., and Zweerink, J.

Published
2021
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7. On-orbit operations and offline data processing of CALET onboard the ISS

Author

Asaoka, Y., Ozawa, S., Torii, S., Adriani, O., Akaike, Y., Asano, K., Bagliesi, M.G., Bigongiari, G., Binns, W.R., Bonechi, S., Bongi, M., Brogi, P., Buckley, J.H., Cannady, N., Castellini, G., Checchia, C., Cherry, M.L., Collazuol, G., Di Felice, V., Ebisawa, K., Fuke, H., Guzik, T.G., Hams, T., Hareyama, M., Hasebe, N., Hibino, K., Ichimura, M., Ioka, K., Ishizaki, W., Israel, M.H., Javaid, A., Kasahara, K., Kataoka, J., Kataoka, R., Katayose, Y., Kato, C., Kawanaka, N., Kawakubo, Y., Krawczynski, H.S., Krizmanic, J.F., Kuramata, S., Lomtadze, T., Maestro, P., Marrocchesi, P.S., Messineo, A.M., Mitchell, J.W., Miyake, S., Mizutani, K., Moiseev, A.A., Mori, K., Mori, M., Mori, N., Motz, H.M., Munakata, K., Murakami, H., Nakahira, S., Nishimura, J., de Nolfo, G.A., Okuno, S., Ormes, J.F., Pacini, L., Palma, F., Papini, P., Penacchioni, A.V., Rauch, B.F., Ricciarini, S.B., Sakai, K., Sakamoto, T., Sasaki, M., Shimizu, Y., Shiomi, A., Sparvoli, R., Spillantini, P., Stolzi, F., Takahashi, I., Takayanagi, M., Takita, M., Tamura, T., Tateyama, N., Terasawa, T., Tomida, H., Tsunesada, Y., Uchihori, Y., Ueno, S., Vannuccini, E., Wefel, J.P., Yamaoka, K., Yanagita, S., Yoshida, A., Yoshida, K., and Yuda, T.

Published
2018
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8. The results from BESS-Polar experiment

Author

Abe, K., Fuke, H., 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., Picot-Clemente, N., Sakai, K., Sasaki, M., Seo, E.S., Streitmatter, R.E., Suzuki, J., Tanaka, K., Thakur, N., Yamamoto, A., Yoshida, T., and Yoshimura, K.

Published
2017
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9. Energy calibration of CALET onboard the International Space Station

Author

Asaoka, Y., Akaike, Y., Komiya, Y., Miyata, R., Torii, S., Adriani, O., Asano, K., Bagliesi, M.G., Bigongiari, G., Binns, W.R., Bonechi, S., Bongi, M., Brogi, P., Buckley, J.H., Cannady, N., Castellini, G., Checchia, C., Cherry, M.L., Collazuol, G., Di Felice, V., Ebisawa, K., Fuke, H., Guzik, T.G., Hams, T., Hareyama, M., Hasebe, N., Hibino, K., Ichimura, M., Ioka, K., Ishizaki, W., Israel, M.H., Javaid, A., Kasahara, K., Kataoka, J., Kataoka, R., Katayose, Y., Kato, C., Kawanaka, N., Kawakubo, Y., Kitamura, H., Krawczynski, H.S., Krizmanic, J.F., Kuramata, S., Lomtadze, T., Maestro, P., Marrocchesi, P.S., Messineo, A.M., Mitchell, J.W., Miyake, S., Mizutani, K., Moiseev, A.A., Mori, K., Mori, M., Mori, N., Motz, H.M., Munakata, K., Murakami, H., Nakagawa, Y.E., Nakahira, S., Nishimura, J., Okuno, S., Ormes, J.F., Ozawa, S., Pacini, L., Palma, F., Papini, P., Penacchioni, A.V., Rauch, B.F., Ricciarini, S., Sakai, K., Sakamoto, T., Sasaki, M., Shimizu, Y., Shiomi, A., Sparvoli, R., Spillantini, P., Stolzi, F., Takahashi, I., Takayanagi, M., Takita, M., Tamura, T., Tateyama, N., Terasawa, T., Tomida, H., Tsunesada, Y., Uchihori, Y., Ueno, S., Vannuccini, E., Wefel, J.P., Yamaoka, K., Yanagita, S., Yoshida, A., Yoshida, K., and Yuda, T.

Published
2017
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12. Direct Measurement of the Cosmic-Ray Helium Spectrum from 40 GeV to 250 TeV with the Calorimetric Electron Telescope on the International Space Station

Author

Adriani, O, Akaike, Y, Asano, K, Asaoka, Y, Berti, E, Bigongiari, G, Binns, W R, Bongi, M, Brogi, P, Bruno, A, Buckley, J H, Cannady, N, Castellini, G, Checchia, C, Cherry, M L, Collazuol, G, de Nolfo, G A, Ebisawa, K, Ficklin, A W, Fuke, H, Gonzi, S, Guzik, T G, Hams, T, Hibino, K, Ichimura, M, Ioka, K, Ishizaki, W, Israel, M H, Kasahara, K, Kataoka, J, Kataoka, R, Katayose, Y, Kato, C, Kawanaka, N, Kawakubo, Y, Kobayashi, K, Kohri, K, Krawczynski, H S, Krizmanic, J F, Maestro, P, Marrocchesi, P S, Messineo, A M, Mitchell, J W, Miyake, S, Moiseev, A A, Mori, M, Mori, N, Motz, H M, Munakata, K, Nakahira, S, Nishimura, J, Okuno, S, Ormes, J F, Ozawa, S, Pacini, L, Papini, P, Rauch, B F, Ricciarini, S B, Sakai, K, Sakamoto, T, Sasaki, M, Shimizu, Y, Shiomi, A, Spillantini, P, Stolzi, F, Sugita, S, Sulaj, A, Takita, M, Tamura, T, Terasawa, T, Torii, S, Tsunesada, Y, Uchihori, Y, Vannuccini, E, Wefel, J P, Yamaoka, K, Yanagita, S, Yoshida, A, Yoshida, K, and Zober, W V

Subjects
Cosmic Rays Composition and Propagation Cosmic Rays and Astroparticle Detectors
Published
2023

13. Cosmic-ray Boron Flux Measured from 8.4 GeV$/n$ to 3.8 TeV$/n$ with the Calorimetric Electron Telescope on the International Space Station

Author

Adriani, O., Akaike, Y., Asano, K., Asaoka, Y., Berti, E., Bigongiari, G., Binns, W. R., Bongi, M., Brogi, P., Bruno, A., Buckley, J. H., Cannady, N., Castellini, G., Checchia, C., Cherry, M. L., Collazuol, G., de Nolfo, G. A., Ebisawa, K., Ficklin, A. W., Fuke, H., Gonzi, S., Guzik, T. G., Hams, T., Hibino, K., Ichimura, M., Ioka, K., Ishizaki, W., Israel, M. H., Kasahara, K., Kataoka, J., Kataoka, R., Katayose, Y., Kato, C., Kawanaka, N., Kawakubo, Y., Kobayashi, K., Kohri, K., Krawczynski, H. S., Krizmanic, J. F., Maestro, P., Marrocchesi, P. S., Messineo, A. M., Mitchell, J. W., Miyake, S., Moiseev, A. A., Mori, M., Mori, N., Motz, H. M., Munakata, K., Nakahira, S., Nishimura, J., Okuno, S., Ormes, J. F., Ozawa, S., Pacini, L., Papini, P., Rauch, B. F., Ricciarini, S. B., Sakai, K., Sakamoto, T., Sasaki, M., Shimizu, Y., Shiomi, A., Spillantini, P., Stolzi, F., Sugita, S., Sulaj, A., Takita, M., Tamura, T., Terasawa, T., Torii, S., Tsunesada, Y., Uchihori, Y., Vannuccini, E., Wefel, J. P., Yamaoka, K., Yanagita, S., Yoshida, A., Yoshida, K., and Zober, W. V.

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), FOS: Physical sciences, Cosmic Rays and Astroparticle Detector Cosmic Rays Propagation and Composition, Astrophysics - High Energy Astrophysical Phenomena
Abstract

We present the measurement of the energy dependence of the boron flux in cosmic rays and its ratio to the carbon flux \textcolor{black}{in an energy interval from 8.4 GeV$/n$ to 3.8 TeV$/n$} based on the data collected by the CALorimetric Electron Telescope (CALET) during $\sim 6.4$ years of operation on the International Space Station. An update of the energy spectrum of carbon is also presented with an increase in statistics over our previous measurement. The observed boron flux shows a spectral hardening at the same transition energy $E_0 \sim 200$ GeV$/n$ of the C spectrum, though B and C fluxes have different energy dependences. The spectral index of the B spectrum is found to be $\gamma = -3.047\pm0.024$ in the interval $25 < E < 200$ GeV$/n$. The B spectrum hardens by $\Delta \gamma_B=0.25\pm0.12$, while the best fit value for the spectral variation of C is $\Delta \gamma_C=0.19\pm0.03$. The B/C flux ratio is compatible with a hardening of $0.09\pm0.05$, though a single power-law energy dependence cannot be ruled out given the current statistical uncertainties. A break in the B/C ratio energy dependence would support the recent AMS-02 observations that secondary cosmic rays exhibit a stronger hardening than primary ones. We also perform a fit to the B/C ratio with a leaky-box model of the cosmic-ray propagation in the Galaxy in order to probe a possible residual value $\lambda_0$ of the mean escape path length $\lambda$ at high energy. We find that our B/C data are compatible with a non-zero value of $\lambda_0$, which can be interpreted as the column density of matter that cosmic rays cross within the acceleration region., Comment: main text: 7 pages, 3 figures; supplemental material: 13 pages, 8 figures, 3 tables

Published
2022

14. Observation of Spectral Structures in the Flux of Cosmic-Ray Protons from 50 GeV to 60 TeV with the Calorimetric Electron Telescope on the International Space Station

Author

Adriani, O., Akaike, Y., Asano, K., Asaoka, Y., Berti, E., Bigongiari, G., Binns, W. R., Bongi, M., Brogi, P., Bruno, A., Buckley, J. H., Cannady, N., Castellini, G., Checchia, C., Cherry, M. L., Collazuol, G., Ebisawa, K., Ficklin, A. W., Fuke, H., Gonzi, S., Guzik, T. G., Hams, T., Hibino, K., Ichimura, M., Ioka, K., Ishizaki, W., Israel, M. H., Kasahara, K., Kataoka, J., Kataoka, R., Katayose, Y., Kato, C., Kawanaka, N., Kawakubo, Y., Kobayashi, K., Kohri, K., Krawczynski, H. S., Krizmanic, J. F., Maestro, P., Marrocchesi, P. S., Messineo, A. M., Mitchell, J. W., Miyake, S., Moiseev, A. A., Mori, M., Mori, N., Motz, H. M., Munakata, K., Nakahira, S., Nishimura, J., De Nolfo, G. A., Okuno, S., Ormes, J. F., Ozawa, S., Pacini, L., Papini, P., Rauch, B. F., Ricciarini, S. B., Sakai, K., Sakamoto, T., Sasaki, M., Shimizu, Y., Shiomi, A., Spillantini, P., Stolzi, F., Sugita, S., Sulaj, A., Takita, M., Tamura, T., Terasawa, T., Torii, S., Tsunesada, Y., Uchihori, Y., Vannuccini, E., Wefel, J. P., Yamaoka, K., Yanagita, S., Yoshida, A., Yoshida, K., and Zober, W. V.

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), General Physics and Astronomy, FOS: Physical sciences, Astrophysics - High Energy Astrophysical Phenomena, Cosmic Rays Propagation and Composition Cosmic Rays and Astroparticle Detectors
Abstract

A precise measurement of the cosmic-ray proton spectrum with the Calorimetric Electron Telescope (CALET) is presented in the energy interval from 50 GeV to 60 TeV, and the observation of a softening of the spectrum above 10 TeV is reported. The analysis is based on the data collected during $\sim$6.2 years of smooth operations aboard the International Space Station and covers a broader energy range with respect to the previous proton flux measurement by CALET, with an increase of the available statistics by a factor of $\sim$2.2. Above a few hundred GeV we confirm our previous observation of a progressive spectral hardening with a higher significance (more than 20 sigma). In the multi-TeV region we observe a second spectral feature with a softening around 10 TeV and a spectral index change from =2.6 to -2.9 consistently, within the errors, with the shape of the spectrum reported by DAMPE. We apply a simultaneous fit of the proton differential spectrum which well reproduces the gradual change of the spectral index encompassing the lower energy power-law regime and the two spectral features observed at higher energies., main text: 8 pages, 5 figures, supplemental material: 9 pages, 7 figures, 1 table, marked as a PRL Editor's Suggestion

Published
2022

16. Time variations of cosmic-ray helium isotopes with BESS-Polar I

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., Moiseev, A.A., Nishimura, J., Nozaki, M., Orito, R., Ormes, J.F., Picot-Clémente, 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.

Published
2014
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18. The flight of the GAPS prototype experiment

Author

von Doetinchem, P., Aramaki, T., Bando, N., Boggs, S.E., Fuke, H., Gahbauer, F.H., Hailey, C.J., Koglin, J.E., Mognet, S.A.I., Madden, N., Okazaki, S., Ong, R.A., Perez, K.M., Yoshida, T., and Zweerink, J.

Published
2014
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19. LiteBIRD: Mission Overview and Focal Plane Layout

Author

Matsumura, T., Akiba, Y., Arnold, K., Borrill, J., Chendra, R., Chinone, Y., Cukierman, A., de Haan, T., Dobbs, M., Dominjon, A., Elleflot, T., Errard, J., Fujino, T., Fuke, H., Goeckner-wald, N., Halverson, N., Harvey, P., Hasegawa, M., Hattori, K., Hattori, M., Hazumi, M., Hill, C., Hilton, G., Holzapfel, W., Hori, Y., Hubmayr, J., Ichiki, K., Inatani, J., Inoue, M., Inoue, Y., Irie, F., Irwin, K., Ishino, H., Ishitsuka, H., Jeong, O., Karatsu, K., Kashima, S., Katayama, N., Kawano, I., Keating, B., Kibayashi, A., Kibe, Y., Kida, Y., Kimura, K., Kimura, N., Kohri, K., Komatsu, E., Kuo, C. L., Kuromiya, S., Kusaka, A., Lee, A., Linder, E., Matsuhara, H., Matsuoka, S., Matsuura, S., Mima, S., Mitsuda, K., Mizukami, K., Morii, H., Morishima, T., Nagai, M., Nagasaki, T., Nagata, R., Nakajima, M., Nakamura, S., Namikawa, T., Naruse, M., Natsume, K., Nishibori, T., Nishijo, K., Nishino, H., Nitta, T., Noda, A., Noguchi, T., Ogawa, H., Oguri, S., Ohta, I. S., Otani, C., Okada, N., Okamoto, A., Okamoto, A., Okamura, T., Rebeiz, G., Richards, P., Sakai, S., Sato, N., Sato, Y., Segawa, Y., Sekiguchi, S., Sekimoto, Y., Sekine, M., Seljak, U., Sherwin, B., Shinozaki, K., Shu, S., Stompor, R., Sugai, H., Sugita, H., Suzuki, T., Suzuki, A., Tajima, O., Takada, S., Takakura, S., Takano, K., Takei, Y., Tomaru, T., Tomita, N., Turin, P., Utsunomiya, S., Uzawa, Y., Wada, T., Watanabe, H., Westbrook, B., Whitehorn, N., Yamada, Y., Yamasaki, N., Yamashita, T., Yoshida, M., Yoshida, T., and Yotsumoto, Y.

Published
2016
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20. The CALorimetric Electron Telescope (CALET) on the International Space Station: Results from the First Two Years of Operation

Author

Asaoka Y, Adriani O, Akaike Y, Asano K, Bagliesi MG, Berti E, Bigongiari G, Binns WR, Bonechi S, Bongi M, Bruno A, Brogi P, Buckley J H, Cannady N, Castellini G, Checchia C, Cherry M L, Collazuol G, Di Felice V, Ebisawa K, Fuke H, Guzik T G, Hams T, Hasebe N, Hibinov K, Ichimura M, Ioka K, Ishizaki W, Israel M H, Kasahara K, Kataoka J, Kataoka R, Katayose Y, Kato C, Kawanaka N, Kawakubo Y, Kohri K, Krawczynski H S, Krizmanic J F, Lomtadze T, Maestro P, Marrocchesi P S, Messineo A M, Mitchell J W, Miyake S, Moiseev A A, Mori K, Mori M, Mori N, Motz H M, Munakata K, Murakami H, Nakahira S, Nishimura J, De Nolfo G A, Okuno S, Ormes J F, Ozawa S, Pacini L, Palma F, Pal'shin V, Papini P, Penacchioni A V, Rauch B F, Ricciarini S B, Sakai K, Sakamoto T, Sasaki M, Shimizu Y, Shiomi A, Sparvoli R, Spillantini P, Stolzi F, Sugita S, Suh J E, Sulaj A, Takahashi I, Takayanagi M, Takita M, Tamura T, Tateyama N, Terasawa T, Tomida H, Torii S, Tsunesada Y, Uchihori Y, Ueno S, Vannuccini E, Wefel J P, Yamaoka K, Yanagita S, Yoshida A, and Yoshida K

Subjects
Physics, QC1-999
Abstract

The CALorimetric Electron Telescope (CALET) space experiment, which has been developed by Japan in collaboration with Italy and the United States, is a high-energy astroparticle physics mission on the International Space Station (ISS). The primary goals of the CALET mission include investigation of possible nearby sources of high-energy electrons, detailed study of galactic cosmic-ray acceleration and propagation, and search for dark matter signatures. With a long-term observation onboard the ISS, the CALET experiment measures the flux of cosmic-ray electrons (including positrons) up to 20 TeV, gamma-rays to 10 TeV, and nuclei up to 1,000 TeV based on its charge separation capability from Z = 1 to 40. Since the start of science operation in mid-October, 2015, a continuous observation has been maintained without any major interruptions. The number of triggered events over 10 GeV is nearly 20 million per month. By using the data obtained during the first two-years, here we present a summary of the CALET observations: 1) Electron+positron energy spectrum, 2) Nuclei analysis, 3) Gamma-ray observation with a characterization of the on-orbit performance. The search results for the electromagnetic counterparts of LIGO/Virgo gravitational wave events are also discussed.

Published
2019
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23. Search for cosmic-ray antiproton origins and for cosmological antimatter with BESS

Author

Yamamoto, A., Mitchell, J.W., 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., Moiseev, A.A., 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., Taniguchi, T., Thakur, N., Yamagami, T., and Yoshida, T.

Published
2013
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25. In Search of Cosmic-Ray Antinuclei from Dark Matter with the GAPS Experiment

Author

Xiao, M., Aramaki, T., Bird, R., Boezio, M., Boggs, S. E., Bonvicini, V., Campana, D., Craig, W. W., Everson, E., Fabris, L., Fuke, H., Gahbauer, F., Garcia, I., Gerrity, C., Hailey, C. J., Hayashi, T., Kato, C., Kawachi, A., Kobayashi, S., Kozai, M., Lenni, A., Lowell, A., Manghisoni, Massimo, Marcelli, N., Mochizuki, B., Mognet, S. A. I., Munakata, K., Munini, R., Nakagami, Y., Olson, J., Ong, R. A., Osteria, G., Perez, K., Quinn, S., Re, Valerio, Riceputi, Elisa, Roach, B., Rogers, F., Ryan, J. A., Saffold, N., Scotti, V., Shimizu, Y., Sonzogni, M., Sparvoli, R., Stoessl, A., Tiberio, A., Vannuccini, E., von Doetinchem, P., Wada, T., Yamatami, M., Yoshida, A., Yoshida, T., Zampa, G., and Zweerink, J.

Subjects
Dark matter, readout electronics, Astroparticle physics, detectors, Settore ING-INF/01 - Elettronica
Published
2022

26. The GAPS Instrument: A Large Area Time of Flight and High Resolution Exotic Atom Spectrometer for Cosmic Antinuclei

Author

Quinn, S., Aramaki, T., Bird, R., Boezio, M., Boggs, S. E., Bonvicini, V., Campana, D., Craig, W. W., Everson, E., Fabris, L., Fuke, H., Gahbauer, F., Garcia, I., Gerrity, C., Hailey, C. J., Hayashi, T., Kato, C., Kawachi, A., Kobayashi, S., Kozai, M., Lenni, A., Lowell, A., Manghisoni, Massimo, Marcelli, N., Martucci, M., Mognet, S. I., Munakata, K., Munini, R., Nakagami, Y., Okazaki, S., Olson, J., Ong, R. A., Osteria, G., Perez, K., Re, Valerio, Riceputi, Elisa, Roach, B., Rogers, F., Ryan, J. A., Saffold, N., Saijo, M., Scotti, V., Shimizu, Y., Sonzogni, M., Sparvoli, R., Stoessl, A., Tokunaga, K., Vannuccini, E., von Doetinchem, P., Wada, T., Xiao, M., Yoshida, A., Yoshida, T., Zampa, G., and Zweerink, J.

Subjects
Settore ING-INF/01 - Elettronica
Published
2022

27. Neural Networks approach to event reconstruction for the GAPS experiment

Author

Marcelli, N., Aramaki, T., Bird, R., Boezio, M., Boggs, S. E., Bonvicini, V., Campana, D., Craig, W. W., Everson, E., Fabris, L., Fuke, H., Gahbauer, F., Garcia, I., Gerrity, C., Hailey, C. J., Hayashi, T., Kato, C., Kawachi, A., Kobayashi, S., Kozai, M., Lenni, A., Lowell, A., Manghisoni, Massimo, Mochizuki, B., Mognet, S. A. I., Munakata, K., Munini, R., Nakagami, Y., Olson, J., Ong, R. A., Osteria, G., Perez, K., Quinn, S., Re, Valerio, Riceputi, Elisa, Roach, B., Rogers, F., Ryan, J. A., Saffold, N., Scotti, V., Shimizu, Y., Sonzogni, M., Sparvoli, R., Stoessl, A., Tiberio, A., Vannuccini, E., von Doetinchem, P., Wada, T., Xiao, M., Yamatami, M., Yoshida, A., Yoshida, T., Zampa, G., and Zweerink, J.

Subjects
Settore ING-INF/01 - Elettronica
Published
2022

28. A challenge to the highest balloon altitude

Author

Saito, Y., Akita, D., Fuke, H., Iijima, I., Izutsu, N., Kato, Y., Kawada, J., Matsuzaka, Y., Mizuta, E., Namiki, M., Nonaka, N., Ohta, S., Sato, T., Seo, M., Takada, A., Tamura, K., Toriumi, M., Yamagami, T., Yamada, K., Yoshida, T., Matsushima, K., and Tanaka, S.

Published
2012
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29. Searching for cosmic antihelium nuclei with the GAPS experiment

Author

Stoessl, A., Aramaki, T., Bird, R., Boezio, M., Boggs, S. E., Bonvicini, V., Campana, D., Craig, W. W., Everson, E., Fabris, L., Fuke, H., Gahbauer, F., Garcia, I., Gerrity, C., Hailey, C. J., Hayashi, T., Kato, C., Kawachi, A., Kobayashi, S., Kozai, M., Lenni, A., Lowell, A., Manghisoni, Massimo, Marcelli, N., Mognet, S. A. I., Munakata, K., Munini, R., Nakagami, Y., Olson, J., Ong, R. A., Osteria, G., Perez, K., Quinn, S., Re, Valerio, Riceputi, Elisa, Roach, B., Rogers, F., Ryan, J. A., Saffold, N., Scotti, V., Shimizu, Y., Sonzogni, M., Sparvoli, R., Tiberio, A., Vannuccini, E., von Doetinchem, P., Wada, T., Xiao, M., Yamatami, M., Yoshida, A., Yoshida, T., Zampa, G., Zweerink, J., Aramaki, T., Bird, R., Boezio, M., Boggs, S. E., Bonvicini, V., Campana, D., Craig, W. W., Everson, E., Fabris, L., Fuke, H., Gahbauer, F., Garcia, I., Gerrity, C., Hailey, C. J., Hayashi, T., Kato, C., Kawachi, A., Kobayashi, S., Kozai, M., Lenni, A., Lowell, A., Manghisoni, M., Marcelli, N., Mochizuki, B., Mognet, S. A. I., Munakata, K., Munini, R., Nakagami, Y., Olson, J., Ong, R. A., Osteria, G., Perez, K., Quinn, S., Re, V., Riceputi, E., Roach, B., Rogers, F., Ryan, J. A., Saffold, N., Scotti, V., Shimizu, Y., Sonzogni, M., Sparvoli, R., Stoessl, A., Tiberio, A., Vannuccini, E., von Doetinchem, P., Wada, T., Xiao, M., Yamatani, M., Yoshida, A., Yoshida, T., Zampa, G., and Zweerink, J.

Subjects
Astroparticle Physics, cosmic rays, Readout electronics, Dark matter, Detectors, GAPS, cosmic antihelium, Settore ING-INF/01 - Elettronica, cosmic ray
Abstract

At low energies, cosmic antideuterons and antihelium provide an ultra-low background signature of dark matter annihilation, decay, and other beyond the Standard Model phenomena. The General Antiparticle Spectrometer (GAPS) is an Antarctic balloon experiment designed to search for lowenergy (0.1−0.3 GeV/n) antinuclei, and is planned to launch in the austral summer of 2022. While optimized for an antideuteron search, GAPS also has unprecedented capabilites for the detection of low-energy antihelium nuclei, utilizing a novel detection technique based on the formation, decay, and annihilation of exotic atoms. The AMS-02 collaboration has recently reported several antihelium nuclei candidate events, which sets GAPS in a unique position to set constraints on the cosmic antihelium flux in an energy region which is essentially free of astrophysical background. In this contribution, we illustrate the capabilities of GAPS to search for cosmic antihelium-3 utilizing complete instrument simulations, event reconstruction, and the inclusion of atmospheric effects. We show that GAPS is capable of setting unprecedented limits on the cosmic antihelium flux, opening a new window on exotic cosmic physics.

Published
2021

30. Neural Networks approach to event reconstruction for the GAPS experiment

Author

Aramaki, T., Bird, R., Boezio, M., Boggs, S. E., Bonvicini, V., Campana, D., Craig, W. W., Everson, E., Fabris, L., Fuke, H., Gahbauer, F., Garcia, I., Gerrity, C., Hailey, C. J., Hayashi, T., Kato, C., Kawachi, A., Kobayashi, S., Kozai, M., Lenni, A., Lowell, A., Manghisoni, M., Marcelli, N., Mochizuki, B., Mognet, S. A. I., Munakata, K., Munini, R., Nakagami, Y., Olson, J., Ong, R. A., Osteria, G., Perez, K., Quinn, S., Re, V., Riceputi, E., Roach, B., Rogers, F., Ryan, J. A., Saffold, N., Scotti, V., Shimizu, Y., Sonzogni, M., Sparvoli, R., Stoessl, A., Tiberio, A., Vannuccini, E., von Doetinchem, P., Wada, T., Xiao, M., Yamatani, M., Yoshida, A., Yoshida, T., Zampa, G., Zweerink, J., Aramaki, T., Bird, R., Boezio, M., Boggs, S. E., Bonvicini, V., Campana, D., Craig, W. W., Everson, E., Fabris, L., Fuke, H., Gahbauer, F., Garcia, I., Gerrity, C., Hailey, C. J., Hayashi, T., Kato, C., Kawachi, A., Kobayashi, S., Kozai, M., Lenni, A., Lowell, A., Manghisoni, M., Marcelli, N., Mochizuki, B., Mognet, S. A. I., Munakata, K., Munini, R., Nakagami, Y., Olson, J., Ong, R. A., Osteria, G., Perez, K., Quinn, S., Re, V., Riceputi, E., Roach, B., Rogers, F., Ryan, J. A., Saffold, N., Scotti, V., Shimizu, Y., Sonzogni, M., Sparvoli, R., Stoessl, A., Tiberio, A., Vannuccini, E., von Doetinchem, P., Wada, T., Xiao, M., Yamatani, M., Yoshida, A., Yoshida, T., Zampa, G., and Zweerink, J.

Subjects
GAPS, neural networks, event reconstruction, neural network
Abstract

The General Antiparticle Spectrometer (GAPS) is a balloon-borne experiment, scheduled for a first flight in the austral summer 2022. It is designed to measure low energy (< 0.25 GeV/n) cosmic antinuclei. A particular focus is on antideuterons, which are predicted to have an ultra-low astrophysical background as compared to signals from dark matter annihilation or decay in the Galactic halo. GAPS uses a novel technique for particle identification based on the formation and decay of exotic atoms. To achieve sufficient rejection power for particle identification, an accurate determination of several fundamental quantities is needed. The precise reconstruction of the energy deposition pattern on the primary track is a particularly intricate problem and we developed a strategy devised to solve this using modern machine learning techniques. In the future, this approach can also be used for particle identification. Here, we present preliminary results of these efforts obtained from simulations.

Published
2021

32. Mission Design of LiteBIRD

Author

Matsumura, T., Akiba, Y., Borrill, J., Chinone, Y., Dobbs, M., Fuke, H., Ghribi, A., Hasegawa, M., Hattori, K., Hattori, M., Hazumi, M., Holzapfel, W., Inoue, Y., Ishidoshiro, K., Ishino, H., Ishitsuka, H., Karatsu, K., Katayama, N., Kawano, I., Kibayashi, A., Kibe, Y., Kimura, K., Kimura, N., Koga, K., Kozu, M., Komatsu, E., Lee, A., Matsuhara, H., Mima, S., Mitsuda, K., Mizukami, K., Morii, H., Morishima, T., Murayama, S., Nagai, M., Nagata, R., Nakamura, S., Naruse, M., Natsume, K., Nishibori, T., Nishino, H., Noda, A., Noguchi, T., Ogawa, H., Oguri, S., Ohta, I., Otani, C., Richards, P., Sakai, S., Sato, N., Sato, Y., Sekimoto, Y., Shimizu, A., Shinozaki, K., Sugita, H., Suzuki, T., Suzuki, A., Tajima, O., Takada, S., Takakura, S., Takei, Y., Tomaru, T., Uzawa, Y., Wada, T., Watanabe, H., Yoshida, M., Yamasaki, N., Yoshida, T., and Yotsumoto, K.

Published
2014
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34. A new balloon base in Japan

Author

Fuke, H., Akita, D., Iijima, I., Izutsu, N., Kato, Y., Kawada, J., Matsuzaka, Y., Mizuta, E., Namiki, M., Nonaka, N., Ohta, S., Saito, Y., Seo, M., Takada, A., Tamura, K., Toriumi, M., Yamada, K., Yamagami, T., and Yoshida, T.

Published
2010
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37. CALET Search for Electromagnetic Counterparts of Gravitational Waves during the LIGO/Virgo O3 Run.

Author

Adriani, O., Akaike, Y., Asano, K., Asaoka, Y., Berti, E., Bigongiari, G., Binns, W. R., Bongi, M., Brogi, P., Bruno, A., Buckley, J. H., Cannady, N., Castellini, G., Checchia, C., Cherry, M. L., Collazuol, G., Ebisawa, K., Ficklin, A. W., Fuke, H., and Gonzi, S.

Subjects
GAMMA rays, GAMMA ray bursts, COSMIC rays, HARD X-rays, GRAVITATIONAL waves, SPACE stations, SCINTILLATORS
Abstract

The CALorimetric Electron Telescope (CALET) on the International Space Station consists of a high-energy cosmic-ray CALorimeter (CAL) and a lower-energy CALET Gamma-ray Burst Monitor (CGBM). CAL is sensitive to electrons up to 20 TeV, cosmic-ray nuclei from Z = 1 through Z ∼ 40, and gamma rays over the range 1 GeVâ€"10 TeV. CGBM observes gamma rays from 7 keV to 20 MeV. The combined CAL-CGBM instrument has conducted a search for gamma-ray bursts (GRBs) since 2015 October. We report here on the results of a search for X-ray/gamma-ray counterparts to gravitational-wave events reported during the LIGO/Virgo observing run O3. No events have been detected that pass all acceptance criteria. We describe the components, performance, and triggering algorithms of the CGBMâ€"the two Hard X-ray Monitors consisting of LaBr3(Ce) scintillators sensitive to 7 keVâ€"1 MeV gamma rays and a Soft Gamma-ray Monitor BGO scintillator sensitive to 40 keVâ€"20 MeVâ€"and the high-energy CAL consisting of a charge detection module, imaging calorimeter, and the fully active total absorption calorimeter. The analysis procedure is described and upper limits to the time-averaged fluxes are presented. [ABSTRACT FROM AUTHOR]

Published
2022
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38. BESS-Polar experiment: Progress and future prospects

Author

Yoshimura, K., Abe, K., Fuke, H., Haino, S., Hams, T., Hasegawa, M., Horikoshi, A., Kim, K.C., Kumazawa, T., Kusumoto, A., Lee, M.-H., Makida, Y., Matsuda, S., Matsukawa, Y., Mitchell, J.W., Moiseev, A.A., 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., Takeuchi, K., Thakur, N., Tanaka, K., Yamagami, T., Yamamoto, A., and Yoshida, T.

Published
2008
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40. CALET on the International Space Station: The first three years of observations

Author

Brogi, P, Adriani, O, Akaike, Y, Asano, K, Asaoka, Y, Bagliesi, Mg, Berti, E, Bigongiari, G, Binns, Wr, Bonechi, S, Bongi, M, Bruno, A, Buckley, Jh, Cannady, N, Castellini, G, Checchia, C, Cherry, Ml, Collazuol, G, Di Felice, V, Ebisawa, K, Fuke, H, Guzik, Tg, Hams, T, Hibino, K, Ichimura, M, Ioka, K, Ishizaki, W, Israel, Mh, Kasahara, K, Kataoka, J, Kataoka, R, Katayose, Y, Kato, C, Kawanaka, N, Kawakubo, Y, Kohri, K, Krawczynski, Hs, Krizmanic, Jf, Link, J, Maestro, P, Marrocchesi, Ps, Messineo, Am, Mitchell, Jw, Miyake, S, Moiseev, Aa, Mori, M, Mori, N, Motz, Hm, Munakata, K, Murakami, H, Nakahira, S, Nishimura, J, De Nolfo, Ga, Okuno, S, Ormes, Jf, Ospina, N, Ozawa, S, Pacini, L, Palma, F, Papini, P, Rauch, Bf, Ricciarini, Sb, Sakai, K, Sakamoto, T, Sasaki, M, Shimizu, Y, Shiomi, A, Sparvoli, R, Spillantini, P, Stolzi, F, Sugita, S, Suh, Je, Sulaj, A, Takahashi, I, Takita, M, Tamura, T, Terasawa, T, Torii, S, Tsunesada, Y, Uchihori, Y, Vannuccini, E, Wefel, Jp, Yamaoka, K, Yanagita, S, Yoshida, A, and Yoshida, K

Subjects
Physics, electron, Spectrometer, DARK MATTER, Settore FIS/04, Astrophysics::High Energy Astrophysical Phenomena, Gamma ray, Astronomy, Cosmic ray, CALET, Electron, Condensed Matter Physics, Electromagnetic radiation, Atomic and Molecular Physics, and Optics, Spectral line, ANTIPROTONS, gamma rays, Cosmic rays, nuclei, International Space Station, Measuring instrument, Mathematical Physics
Abstract

The CALorimetric Electron Telescope CALET is a space instrument designed to carry out precision measurements of high energy cosmic-rays on the JEM-EF external platform on the International Space Station, where it has been collecting science data continuously since mid October 2015. In addition to its primary goal of identifying nearby sources of high-energy electrons and possible signatures of dark matter in the electron spectrum, CALET is carrying out extensive measurements of the energy spectra, relative abundances and secondary-to-primary ratios of elements from proton to iron, and even above (up to Z = 40), studying the details of galactic particle propagation and acceleration. An overview of CALET based on the data taken during the first three years of observations is presented, including a direct measurement of the electron+positron energy spectrum from 11 GeV to 4.8 TeV. The proton spectrum has been measured from 50 GeV to 10 TeV covering, for the first time with a single space-borne instrument, the whole energy interval previously investigated in separate sub-ranges by magnetic spectrometers and calorimetric instruments. Preliminary spectra of cosmic-ray nuclei are also presented, together with gamma-ray observations and searches for an e.m. counterpart of LIGO/Virgo GW events.

Published
2020

42. The BESS Program

Author

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

Published
2007
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43. Time Variations of Cosmic-Ray Helium Isotopes with BESS-Polar I

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, Moiseev, A. A, Nishimura, J, Nozaki, M, Orito, R, Ormes, J. F, Picot-Clemente, N, Sakai, K, Sasaki, M, Seo, E. S, Shikaze, Y, and Streitmatter, R. E

Subjects
Astronomy
Abstract

The Balloon-borne Experiment with a Superconducting Spectrometer (BESS) is configured with a solenoidal superconducting magnet and a suite of precision particle detectors, including time-of-flight hodoscopes based on plastic scintillators, a silica-aerogel Cherenkov detector, and a high resolution tracking system with a central jet-type drift chamber. The charges of incident particles are determined from energy losses in the scintillators. Their magnetic rigidities (momentum/charge) are measured by reconstructing each particle trajectory in the magnetic field, and their velocities are obtained by using the time-of-flight system. Together, these measurements can accurately identify helium isotopes among the incoming cosmic-ray helium nuclei up to energies in the GeV per nucleon region. The BESS-Polar I instrument flew for 8.5 days over Antarctica from December 13th to December 21st, 2004. Its long-duration flight and large geometric acceptance allow the time variations of isotopic fluxes to be studied for the first time. The time variations of helium isotope fluxes are presented here for rigidities from 1.2 to 2.5 GV and results are compared to previously reported proton data and neutron monitor data.

Published
2013
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44. The CALorimetric Electron Telescope (CALET) for high-energy astroparticle physics on the International Space Station

Author

Adriani O., Akaike Y., Asano K., Asaoka Y., Bagliesi M.G., Bigongiari G., Binns W.R., Bonechi S., Bongi M., Buckley J.H., Castellini G., Cherry M.L., Collazuol G., Ebisawa K., Di Felice V., Fuke H., Guzik T.G., Hams T., Hareyama M., Hasebe N., Hibino K., Ichimura M., Ioka K., Israel M.H., Javaid A., Kamioka E., Kasahara K., Kataoka J., Kataoka R., Katayose Y., Kawanaka N., Kitamura H., Kotani T., Krawczynski H.S., Krizmanic J.F., Kubota A., Kuramata S., Lomtadze T., Maestro P., Marcelli L., Marrocchesi P.S., Mitchell J.W., Miyake S., Mizutani K., Moiseev A.A., Mori K., Mori M., Mori N., Motz H.M., Munakata K., Murakami H., Nakagawa Y.E., Nakahira S., Nishimura J., Okuno S., Ormes J.F., Ozawa S., Palma F., Papini P., Rauch B.F., Ricciarini S.B., Sakamoto T., Sasaki M., Shibata M., Shimizu Y., Shiomi A., Sparvoli R., Spillantini P., Takahashi I., Takayanagi M., Takita M., Tamura T., Tateyama N., Terasawa T., Tomida H., Torii S., Tunesada Y., Uchihori Y., Ueno S., Vannuccini E., Wefel J.P., Yamaoka K., Yanagita S., Yoshida A., Yoshida K., and Yuda T.

Subjects
Physics, QC1-999
Abstract

The CALorimetric Electron Telescope (CALET) is a space experiment, currently under development by Japan in collaboration with Italy and the United States, which will measure the flux of cosmic-ray electrons (and positrons) up to 20 TeV energy, of gamma rays up to 10 TeV, of nuclei with Z from 1 to 40 up to 1 PeV energy, and will detect gamma-ray bursts in the 7 keV to 20 MeV energy range during a 5 year mission. These measurements are essential to investigate possible nearby astrophysical sources of high energy electrons, study the details of galactic particle propagation and search for dark matter signatures. The main detector of CALET, the Calorimeter, consists of a module to identify the particle charge, followed by a thin imaging calorimeter (3 radiation lengths) with tungsten plates interleaving scintillating fibre planes, and a thick energy measuring calorimeter (27 radiation lengths) composed of lead tungstate logs. The Calorimeter has the depth, imaging capabilities and energy resolution necessary for excellent separation between hadrons, electrons and gamma rays. The instrument is currently being prepared for launch (expected in 2015) to the International Space Station ISS, for installation on the Japanese Experiment Module - Exposure Facility (JEM-EF).

Published
2015
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45. 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, and Thakur, N

Subjects
Astrophysics
Abstract

The energy spectrum of cosmic-ray antiprotons (p-bar's) from 0.17 to 3.5 GeV has been measured using 7886 p-bar's 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 p-bar calculations. Cosmologically primary p-bar's have been investigated by comparing measured and calculated p-bar spectra. BESS-Polar II data.show no evidence of primary p-bar's from the evaporation of primordial black holes.

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

Author

Sasaki, M, Mitchell, J. W, Hams, T, Abe, K, Fuke, H, Haino, S, Hasegawa, M, Horikoshi, A, Itazaki, A, Kim, K. C, Kumazawa, T, Kusumoto, A, Lee, M. H, Makida, Y, Matsuda, S, Matsukawa, Y, Matsumoto, K, Streitmatter, R. E, Myers, Z, Nishimura, J, Nozaki, M, Orito, R, Ormes, J. F, Sakai, K, and Seo, E. S

Subjects
Physics (General)
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. BESSPolar 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 x 10(exp 6) [Z] = 2 nuclei from 1.0 to 20 GV or in BESS-Polar II data among 4.0 x 10(exp 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 x 10(exp -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 x 10(exp -7) was determined for the combined BESS-Polar data. These are the most stringent limits obtained to date.

Published
2012

47. Search for Cosmic-Ray Antiproton Origins and for Cosmological Antimatter with BESS

Author

Yamamoto, A, Mitchell, J. W, 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, M, Matsuda, S, Matsukawa, Y, Matsumoto, K, Moiseev, A. A, Myers, Z, Nishimura, J, Nozaki, M, Orito, R, Sasaki, M, and Streitmatter, R. E

Subjects
Astronomy
Abstract

The balloon-borne experiment with a superconducting spectrometer (BESS) has performed cosmic-ray observations as a US-Japan cooperative space science program, and has provided fundamental data on cosmic rays to study elementary particle phenomena in the early Universe. The BESS experiment has measured the energy spectra of cosmic-ray antiprotons to investigate signatures of possible exotic origins such as dark matter candidates or primordial black holes. and searched for heavier antinuclei that might reach Earth from antimatter domains formed in the early Universe. The apex of the BESS program was reached with the Antarctic flight of BESS-Polar II, during the 2007- 2008 Austral Summer, that obtained over 4.7 billion cosmic-ray events from 24.5 days of observation. The flight took place at the expected solar minimum, when the sensitivity of the low-energy antiproton measurements to a primary source is greatest. Here, we report the scientific restults, focusing on the long-duration flights of BESS-Polar I (2004) and BESS-Polar II (2007-2008).

Published
2011
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48. Measurement of Cosmic-Ray Antiproton Spectrum at Solar Minimum with a Long-Duration Balloon Flight in 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, and Thakur, N

Subjects
Astronomy
Abstract

The energy spectrum of cosmic-ray antiprotons (p(raised bar)'s) collected by the BESS-Polar II instrument during a long-duration flight over Antarctica in the solar minimum period of December 2007 through January 2008. The p(raised bar) spectrum measured by BESS-Polar II shows good consistency with secondary p(raised bar) calculations. Cosmologically primary p(raised bar)'s have been searched for by comparing the observed and calculated p(raised bar) spectra. The BESSPolar II result shows no evidence of primary p(raised bar)'s originating from the evaporation of PBH.

Published
2011

50. The BESS Program

Author

Mitchell, J.W., Abe, K., Anraku, K., Fuke, H., Haino, S., Hams, T., Imori, M., Itazaki, A., Izumi, K., Kumazawa, T., Lee, M.H., Maeno, T., Makida, Y., Matsuda, S., Matsumoto, H., Matsumoto, K., Moiseev, A., Myers, Z.D., Nishimura, J., Nozaki, M., Omiya, H., Orito, S., Ormes, J.F., Sanuki, T., 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.

Published
2004
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