A precision measurement by AMS of the positron fraction in primary cosmic rays in the energy range from 0.5 to 500 GeV based on 10.9 million positron and electron events is presented. This measurement extends the energy range of our previous observation and increases its precision. The new results show, for the first time, that above similar to 200 GeV the positron fraction no longer exhibits an increase with energy.
High Statistics Measurement of the Positron Fraction in Primary Cosmic Rays of 0.5-500 GeV with the Alpha Magnetic Spectrometer on the International Space Station / Accardo, L; Aguilar, M; Aisa, D; Alpat, B; Alvino, A; Ambrosi, G; Andeen, K; Arruda, L; Attig, N; Azzarello, P; Bachlechner, A; Barao, F; Barrau, A; Barrin, L; Bartoloni, A; Basara, L; Battarbee, M; Battiston, R; Bazo, J; Becker, U; Behlmann, M; Beischer, B; Berdugo, J; Bertucci, B; Bigongiari, G; Bindi, V; Bizzaglia, S; Bizzarri, M; Boella, G; de Boer, W; Bollweg, K; Bonnivard, V; Borgia, B; Borsini, S; Boschini, Mj; Bourquin, M; Burger, J; Cadoux, F; Cai, Xd; Capell, M; Caroff, S; Carosi, G; Casaus, J; Cascioli, V; Castellini, G; Cernuda, I; Cerreta, D; Cervelli, F; Chae, Mj; Chang, Yh; Chen, Ai; Chen, H; Cheng, Gm; Chen, Hs; Cheng, L; Chikanian, A; Chou, Hy; Choumilov, E; Choutko, V; Chung, Ch; Cindolo, F; Clark, C; Clavero, R; Coignet, G; Consolandi, C; Contin, A; Corti, C; Coste, B; Cui, Z; Dai, M; Delgado, C; Della Torre, S; Demirkoz, Mb; Derome, L; Di Falco, S; Di Masso, L; Dimiccoli, F; Diaz, C; von Doetinchem, P; Du, Wj; Duranti, M; D'Urso, D; Eline, A; Eppling, Fj; Eronen, T; Fan, Yy; Farnesini, L; Feng, J; Fiandrini, E; Fiasson, A; Finch, E; Fisher, P; Galaktionov, Y; Gallucci, G; Garcia, B; Garcia-Lopez, R; Gast, H; Gebauer, I; Gervasi, M; Ghelfi, A; Gillard, W; Giovacchini, F; Goglov, P; Gong, J; Goy, C; Grabski, V; Grandi, D; Graziani, M; Guandalini, C; Guerri, I; Guo, Kh; Haas, D; Habiby, M; Haino, S; Han, Kc; He, Zh; Heil, M; Henning, R; Hoffman, J; Hsieh, Th; Huang, Zc; Huh, C; Incagli, M; Ionica, M; Jang, Wy; Jinchi, H; Kanishev, K; Kim, Gn; Kim, Ks; Kirn, T; Kossakowski, R; Kounina, O; Kounine, A; Koutsenko, V; Krafczyk, Ms; Kunz, S; La Vacca, G; Laudi, E; Laurenti, G; Lazzizzera, I; Lebedev, A; Lee, Ht; Lee, Sc; Leluc, C; Levi, G; Li, Hl; Li, Jq; Li, Q; Li, Q; Li, Tx; Li, W; Li, Y; Li, Zh; Li, Zy; Lim, S; Lin, Ch; Lipari, P; Lippert, T; Liu, D; Liu, H; Lolli, M; Lomtadze, T; Lu, Mj; Lu, Ys; Luebelsmeyer, K; Luo, F; Luo, Jz; Lv, Ss; Majka, R; Malinin, A; Mana, C; Marin, J; Martin, T; Martinez, G; Masi, N; Massera, F; Maurin, D; Menchaca-Rocha, A; Meng, Q; Mo, Dc; Monreal, B; Morescalchi, L; Mott, P; Muller, M; Ni, Jq; Nikonov, N; Nozzoli, F; Nunes, P; Obermeier, A; Oliva, A; Orcinha, M; Palmonari, F; Palomares, C; Paniccia, M; Papi, A; Pauluzzi, M; Pedreschi, E; Pensotti, S; Pereira, R; Pilastrini, R; Pilo, F; Piluso, A; Pizzolotto, C; Plyaskin, V; Pohl, M; Poireau, V; Postaci, E; Putze, A; Quadrani, L; Qi, Xm; Rancoita, Pg; Rapin, D; Ricol, Js; Rodriguez, I; Rosier-Lees, S; Rossi, L; Rozhkov, A; Rozza, D; Rybka, G; Sagdeev, R; Sandweiss, J; Saouter, P; Sbarra, C; Schael, S; Schmidt, Sm; Schuckardt, D; von Dratzig, As; Schwering, G; Scolieri, G; Seo, Es; Shan, Bs; Shan, Yh; Shi, Jy; Shi, Xy; Shi, Ym; Siedenburg, T; Son, D; Spada, F; Spinella, F; Sun, W; Sun, Wh; Tacconi, M; Tang, Cp; Tang, Xw; Tang, Zc; Tao, L; Tescaro, D; Ting, Scc; Ting, Sm; Tomassetti, N; Torsti, J; Turkoglu, C; Urban, T; Vagelli, V; Valente, E; Vannini, C; Valtonen, E; Vaurynovich, S; Vecchi, M; Velasco, M; Vialle, Jp; Vitale, V; Volpini, G; Wang, Lq; Wang, Ql; Wang, Rs; Wang, X; Wang, Zx; Weng, Zl; Whitman, K; Wienkenhover, J; Wu, H; Wu, Ky; Xia, X; Xie, M; Xie, S; Xiong, Rq; Xin, Gm; Xu, Ns; Xu, W; Yan, Q; Yang, J; Yang, M; Ye, Qh; Yi, H; Yu, Yj; Yu, Zq; Zeissler, S; Zhang, Jh; Zhang, Mt; Zhang, Xb; Zhang, Z; Zheng, Zm; Zhou, F; Zhuang, Hl; Zhukov, V; Zichichi, A; Zimmermann, N; Zuccon, P; Zurbach, C. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 113:12(2014). [10.1103/PhysRevLett.113.121101]
High Statistics Measurement of the Positron Fraction in Primary Cosmic Rays of 0.5-500 GeV with the Alpha Magnetic Spectrometer on the International Space Station
Accardo L; Aguilar M; Aisa D; Alpat B; Alvino A; Ambrosi G; Andeen K; Arruda L; Attig N; Azzarello P; Bachlechner A; Barao F; Barrau A; Barrin L; Bartoloni A; Basara L; Battarbee M; Battiston R; Bazo J; Becker U; Behlmann M; Beischer B; Berdugo J; Bertucci B; Bigongiari G; Bindi V; Bizzaglia S; Bizzarri M; Boella G; de Boer W; Bollweg K; Bonnivard V; Borgia B; Borsini S; Boschini MJ; Bourquin M; Burger J; Cadoux F; Cai XD; Capell M; Caroff S; Carosi G; Casaus J; Cascioli V; Castellini G; Cernuda I; Cerreta D; Cervelli F; Chae MJ; Chang YH; Chen AI; Chen H; Cheng GM; Chen HS; Cheng L; Chikanian A; Chou HY; Choumilov E; Choutko V; Chung CH; Cindolo F; Clark C; Clavero R; Coignet G; Consolandi C; Contin A; Corti C; Coste B; Cui Z; Dai M; Delgado C; Della Torre S; Demirkoz MB; Derome L; Di Falco S; Di Masso L; Dimiccoli F; Diaz C; von Doetinchem P; Du WJ; Duranti M; D'Urso D ;Eline A; Eppling FJ; Eronen T; Fan YY; Farnesini L; Feng J; Fiandrini E; Fiasson A; Finch E; Fisher P; Galaktionov Y; Gallucci G; Garcia B; Garcia-Lopez R; Gast H; Gebauer I; Gervasi M; Ghelfi A; Gillard W; Giovacchini F; Goglov P; Gong J; Goy C; Grabski V; Grandi D; Graziani M; Guandalini C; Guerri I; Guo KH; Haas D; Habiby M; Haino S; Han KC; He ZH; Heil M; Henning R; Hoffman J; Hsieh TH; Huang ZC; Huh C; Incagli M; Ionica M; Jang WY; Jinchi H; Kanishev K; Kim GN; Kim KS; Kirn T; Kossakowski R; Kounina O; Kounine A; Koutsenko V; Krafczyk MS; Kunz S; La Vacca G; Laudi E; Laurenti G; Lazzizzera I; Lebedev A; Lee HT; Lee SC; Leluc C; Levi G; Li HL; Li JQ; Li Q; Li Q; Li TX; Li W; Li Y; Li ZH; Li ZY; Lim S; Lin CH; Lipari P; Lippert T; Liu D; Liu H; Lolli M; Lomtadze T; Lu MJ; Lu YS; Luebelsmeyer K; Luo F; Luo JZ; Lv SS; Majka R; Malinin A; Mana C; Marin J; Martin T; Martinez G; Masi N; Massera F; Maurin D; Menchaca-Rocha A; Meng Q; Mo DC; Monreal B; Morescalchi L; Mott P; Muller M; Ni JQ; Nikonov N; Nozzoli F; Nunes P; Obermeier A; Oliva A; Orcinha M; Palmonari F; Palomares C; Paniccia M; Papi A; Pauluzzi M; Pedreschi E; Pensotti S; Pereira R; Pilastrini R; Pilo F; Piluso A; Pizzolotto C; Plyaskin V; Pohl M; Poireau V; Postaci E; Putze A; Quadrani L; Qi XM; Rancoita PG; Rapin D; Ricol JS; Rodriguez I; Rosier-Lees S; Rossi L; Rozhkov A; Rozza D ;Rybka G; Sagdeev R; Sandweiss J; Saouter P; Sbarra C; Schael S; Schmidt SM; Schuckardt D; von Dratzig AS; Schwering G; Scolieri G; Seo ES; Shan BS; Shan YH; Shi JY; Shi XY; Shi YM; Siedenburg T; Son D; Spada F; Spinella F; Sun W; Sun WH; Tacconi M; Tang CP; Tang XW; Tang ZC; Tao L; Tescaro D; Ting SCC; Ting SM; Tomassetti N; Torsti J; Turkoglu C; Urban T; Vagelli V; Valente E; Vannini C; Valtonen E; Vaurynovich S; Vecchi M; Velasco M; Vialle JP; Vitale V; Volpini G; Wang LQ; Wang QL; Wang RS; Wang X; Wang ZX; Weng ZL; Whitman K; Wienkenhover J; Wu H; Wu KY; Xia X; Xie M; Xie S; Xiong RQ; Xin GM; Xu NS; Xu W; Yan Q; Yang J; Yang M; Ye QH; Yi H; Yu YJ; Yu ZQ; Zeissler S; Zhang JH; Zhang MT; Zhang XB; Zhang Z; Zheng ZM; Zhou F; Zhuang HL; Zhukov V; Zichichi A; Zimmermann N; Zuccon P; Zurbach C
2014-01-01
Abstract
A precision measurement by AMS of the positron fraction in primary cosmic rays in the energy range from 0.5 to 500 GeV based on 10.9 million positron and electron events is presented. This measurement extends the energy range of our previous observation and increases its precision. The new results show, for the first time, that above similar to 200 GeV the positron fraction no longer exhibits an increase with energy.
Citazione
High Statistics Measurement of the Positron Fraction in Primary Cosmic Rays of 0.5-500 GeV with the Alpha Magnetic Spectrometer on the International Space Station / Accardo, L; Aguilar, M; Aisa, D; Alpat, B; Alvino, A; Ambrosi, G; Andeen, K; Arruda, L; Attig, N; Azzarello, P; Bachlechner, A; Barao, F; Barrau, A; Barrin, L; Bartoloni, A; Basara, L; Battarbee, M; Battiston, R; Bazo, J; Becker, U; Behlmann, M; Beischer, B; Berdugo, J; Bertucci, B; Bigongiari, G; Bindi, V; Bizzaglia, S; Bizzarri, M; Boella, G; de Boer, W; Bollweg, K; Bonnivard, V; Borgia, B; Borsini, S; Boschini, Mj; Bourquin, M; Burger, J; Cadoux, F; Cai, Xd; Capell, M; Caroff, S; Carosi, G; Casaus, J; Cascioli, V; Castellini, G; Cernuda, I; Cerreta, D; Cervelli, F; Chae, Mj; Chang, Yh; Chen, Ai; Chen, H; Cheng, Gm; Chen, Hs; Cheng, L; Chikanian, A; Chou, Hy; Choumilov, E; Choutko, V; Chung, Ch; Cindolo, F; Clark, C; Clavero, R; Coignet, G; Consolandi, C; Contin, A; Corti, C; Coste, B; Cui, Z; Dai, M; Delgado, C; Della Torre, S; Demirkoz, Mb; Derome, L; Di Falco, S; Di Masso, L; Dimiccoli, F; Diaz, C; von Doetinchem, P; Du, Wj; Duranti, M; D'Urso, D; Eline, A; Eppling, Fj; Eronen, T; Fan, Yy; Farnesini, L; Feng, J; Fiandrini, E; Fiasson, A; Finch, E; Fisher, P; Galaktionov, Y; Gallucci, G; Garcia, B; Garcia-Lopez, R; Gast, H; Gebauer, I; Gervasi, M; Ghelfi, A; Gillard, W; Giovacchini, F; Goglov, P; Gong, J; Goy, C; Grabski, V; Grandi, D; Graziani, M; Guandalini, C; Guerri, I; Guo, Kh; Haas, D; Habiby, M; Haino, S; Han, Kc; He, Zh; Heil, M; Henning, R; Hoffman, J; Hsieh, Th; Huang, Zc; Huh, C; Incagli, M; Ionica, M; Jang, Wy; Jinchi, H; Kanishev, K; Kim, Gn; Kim, Ks; Kirn, T; Kossakowski, R; Kounina, O; Kounine, A; Koutsenko, V; Krafczyk, Ms; Kunz, S; La Vacca, G; Laudi, E; Laurenti, G; Lazzizzera, I; Lebedev, A; Lee, Ht; Lee, Sc; Leluc, C; Levi, G; Li, Hl; Li, Jq; Li, Q; Li, Q; Li, Tx; Li, W; Li, Y; Li, Zh; Li, Zy; Lim, S; Lin, Ch; Lipari, P; Lippert, T; Liu, D; Liu, H; Lolli, M; Lomtadze, T; Lu, Mj; Lu, Ys; Luebelsmeyer, K; Luo, F; Luo, Jz; Lv, Ss; Majka, R; Malinin, A; Mana, C; Marin, J; Martin, T; Martinez, G; Masi, N; Massera, F; Maurin, D; Menchaca-Rocha, A; Meng, Q; Mo, Dc; Monreal, B; Morescalchi, L; Mott, P; Muller, M; Ni, Jq; Nikonov, N; Nozzoli, F; Nunes, P; Obermeier, A; Oliva, A; Orcinha, M; Palmonari, F; Palomares, C; Paniccia, M; Papi, A; Pauluzzi, M; Pedreschi, E; Pensotti, S; Pereira, R; Pilastrini, R; Pilo, F; Piluso, A; Pizzolotto, C; Plyaskin, V; Pohl, M; Poireau, V; Postaci, E; Putze, A; Quadrani, L; Qi, Xm; Rancoita, Pg; Rapin, D; Ricol, Js; Rodriguez, I; Rosier-Lees, S; Rossi, L; Rozhkov, A; Rozza, D; Rybka, G; Sagdeev, R; Sandweiss, J; Saouter, P; Sbarra, C; Schael, S; Schmidt, Sm; Schuckardt, D; von Dratzig, As; Schwering, G; Scolieri, G; Seo, Es; Shan, Bs; Shan, Yh; Shi, Jy; Shi, Xy; Shi, Ym; Siedenburg, T; Son, D; Spada, F; Spinella, F; Sun, W; Sun, Wh; Tacconi, M; Tang, Cp; Tang, Xw; Tang, Zc; Tao, L; Tescaro, D; Ting, Scc; Ting, Sm; Tomassetti, N; Torsti, J; Turkoglu, C; Urban, T; Vagelli, V; Valente, E; Vannini, C; Valtonen, E; Vaurynovich, S; Vecchi, M; Velasco, M; Vialle, Jp; Vitale, V; Volpini, G; Wang, Lq; Wang, Ql; Wang, Rs; Wang, X; Wang, Zx; Weng, Zl; Whitman, K; Wienkenhover, J; Wu, H; Wu, Ky; Xia, X; Xie, M; Xie, S; Xiong, Rq; Xin, Gm; Xu, Ns; Xu, W; Yan, Q; Yang, J; Yang, M; Ye, Qh; Yi, H; Yu, Yj; Yu, Zq; Zeissler, S; Zhang, Jh; Zhang, Mt; Zhang, Xb; Zhang, Z; Zheng, Zm; Zhou, F; Zhuang, Hl; Zhukov, V; Zichichi, A; Zimmermann, N; Zuccon, P; Zurbach, C. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 113:12(2014). [10.1103/PhysRevLett.113.121101]
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