A precision measurement by the Alpha Magnetic Spectrometer on the International Space Station of the positron fraction in primary cosmic rays in the energy range from 0.5 to 350 GeV based on 6.8 x 10(6) positron and electron events is presented. The very accurate data show that the positron fraction is steadily increasing from 10 to similar to 250 GeV, but, from 20 to 250 GeV, the slope decreases by an order of magnitude. The positron fraction spectrum shows no fine structure, and the positron to electron ratio shows no observable anisotropy. Together, these features show the existence of new physical phenomena. DOI: 10.1103/PhysRevLett.110.141102
First Result from the Alpha Magnetic Spectrometer on the International Space Station: Precision Measurement of the Positron Fraction in Primary Cosmic Rays of 0.5-350 GeV / Aguilar, M; Alberti, G; Alpat, B; Alvino, A; Ambrosi, G; Andeen, K; Anderhub, H; Arruda, L; Azzarello, P; Bachlechner, A; Barao, F; Baret, B; Barrau, A; Barrin, L; Bartoloni, A; Basara, L; Basili, A; Batalha, L; Bates, J; Battiston, R; Bazo, J; Becker, R; Becker, U; Behlmann, M; Beischer, B; Berdugo, J; Berges, P; Bertucci, B; Bigongiari, G; Biland, A; Bindi, V; Bizzaglia, S; Boella, G; de Boer, W; Bollweg, K; Bolmont, J; Borgia, B; Borsini, S; Boschini, Mj; Boudoul, G; Bourquin, M; Brun, P; Buenerd, M; Burger, J; Burger, W; Cadoux, F; Cai, Xd; Capell, M; Casadei, D; Casaus, J; Cascioli, V; Castellini, G; Cernuda, I; Cervelli, F; Chae, Mj; Chang, Yh; Chen, Ai; Chen, Cr; Chen, H; Cheng, Gm; Chen, Hs; Cheng, L; Chernoplyiokov, N; Chikanian, A; Choumilov, E; Choutko, V; Chung, Ch; Clark, C; Clavero, R; Coignet, G; Commichau, V; Consolandi, C; Contin, A; Corti, C; Dios, Mtc; Coste, B; Crespo, D; Cui, Z; Dai, M; Delgado, C; Della Torre, S; Demirkoz, B; Dennett, P; Derome, L; Di Falco, S; Diao, Xh; Diago, A; Djambazov, L; Diaz, C; von Doetinchem, P; Du, Wj; Dubois, Jm; Duperay, R; Duranti, M; D'Urso, D; Egorov, A; Eline, A; Eppling, Fj; Eronen, T; van Es, J; Esser, H; Falvard, A; Fiandrini, E; Fiasson, A; Finch, E; Fisher, P; Flood, K; Foglio, R; Fohey, M; Fopp, S; Fouque, N; Galaktionov, Y; Gallilee, M; Gallin-Martel, L; Gallucci, G; Garcia, B; Garcia, J; Garcia-Lopez, R; Garcia-Tabares, L; Gargiulo, C; Gast, H; Gebauer, I; Gentile, S; Gervasi, M; Gillard, W; Giovacchini, F; Girard, L; Goglov, P; Gong, J; Goy-Henningsen, C; Grandi, D; Graziani, M; Grechko, A; Gross, A; Guerri, I; de la Guia, C; Guo, Kh; Habiby, M; Haino, S; Hauler, F; He, Zh; Heil, M; Heilig, J; Hermel, R; Hofer, H; Huang, Zc; Hungerford, W; Incagli, M; Ionica, M; Jacholkowska, A; Jang, Wy; Jinchi, H; Jongmanns, M; Journet, L; Jungermann, L; Karpinski, W; Kim, Gn; Kim, Ks; Kirn, T; Kossakowski, R; Koulemzine, A; Kounina, O; Kounine, A; Koutsenko, V; Krafczyk, Ms; Laudi, E; Laurenti, G; Lauritzen, C; Lebedev, A; Lee, Mw; Lee, Sc; Leluc, C; Vargas, Hl; Lepareur, V; Li, Jq; Li, Q; Li, Tx; Li, W; Li, Zh; Lipari, P; Lin, Ch; Liu, D; Liu, H; Lomtadze, T; Lu, Ys; Lucidi, S; Lubelsmeyer, K; Luo, Jz; Lustermann, W; Lv, S; Madsen, J; Majka, R; Malinin, A; Mana, C; Marin, J; Martin, T; Martinez, G; Masciocchi, F; Masi, N; Maurin, D; Mcinturff, A; Mcintyre, P; Menchaca-Rocha, A; Meng, Q; Menichelli, M; Mereu, I; Millinger, M; Mo, Dc; Molina, M; Mott, P; Mujunen, A; Natale, S; Nemeth, P; Ni, Jq; Nikonov, N; Nozzoli, F; Nunes, P; Obermeier, A; Oh, S; Oliva, A; Palmonari, F; Palomares, C; Paniccia, M; Papi, A; Park, Wh; Pauluzzi, M; Pauss, F; Pauw, A; Pedreschi, E; Pensotti, S; Pereira, R; Perrin, E; Pessina, G; Pierschel, G; Pilo, F; Piluso, A; Pizzolotto, C; Plyaskin, V; Pochon, J; Pohl, M; Poireau, V; Porter, S; Pouxe, J; Putze, A; Quadrani, L; Qi, Xn; Rancoita, Pg; Rapin, D; Ren, Zl; Ricol, Js; Riihonen, E; Rodriguez, I; Roeser, U; Rosier-Lees, S; Rossi, L; Rozhkov, A; Rozza, D; Sabellek, A; Sagdeev, R; Sandweiss, J; Santos, B; Saouter, P; Sarchioni, M; Schael, S; Schinzel, D; Schmanau, M; Schwering, G; von Dratzig, As; Scolieri, G; Seo, Es; Shan, Bs; Shi, Jy; Shi, Ym; Siedenburg, T; Siedling, R; Son, D; Spada, F; Spinella, F; Steuer, M; Stiff, K; Sun, W; Sun, Wh; Sun, Xh; Tacconi, M; Tang, Cp; Tang, Xw; Tang, Zc; Tao, L; Tassan-Viol, J; Ting, Scc; Ting, Sm; Titus, C; Tomassetti, N; Toral, F; Torsti, J; Tsai, Jr; Tutt, Jc; Ulbricht, J; Urban, T; Vagelli, V; Valente, E; Vannini, C; Valtonen, E; Trevino, Mv; Vaurynovich, S; Vecchi, M; Vergain, M; Verlaat, B; Vescovi, C; Vialle, Jp; Viertel, G; Volpini, G; Wang, D; Wang, Nh; Wang, Ql; Wang, Rs; Wang, X; Wang, Zx; Wallraff, W; Weng, Zl; Willenbrock, M; Wlochal, M; Wu, H; Wu, Ky; Wu, Zs; Xiao, Wj; 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, Jg; Zhang, Z; Zhang, Mm; Zheng, Zm; Zhuang, Hl; Zhukov, V; Zichichi, A; Zuccon, P; Zurbach, C. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 110:14(2013). [10.1103/PhysRevLett.110.141102]
First Result from the Alpha Magnetic Spectrometer on the International Space Station: Precision Measurement of the Positron Fraction in Primary Cosmic Rays of 0.5-350 GeV
Aguilar M; Alberti G; Alpat B; Alvino A; Ambrosi G; Andeen K; Anderhub H; Arruda L; Azzarello P; Bachlechner A; Barao F; Baret B; Barrau A; Barrin L; Bartoloni A; Basara L; Basili A; Batalha L; Bates J; Battiston R; Bazo J; Becker R; Becker U; Behlmann M; Beischer B; Berdugo J; Berges P; Bertucci B; Bigongiari G; Biland A; Bindi V; Bizzaglia S; Boella G; de Boer W; Bollweg K; Bolmont J; Borgia B; Borsini S; Boschini MJ; Boudoul G; Bourquin M; Brun P; Buenerd M; Burger J; Burger W; Cadoux F; Cai XD; Capell M; Casadei D; Casaus J; Cascioli V; Castellini G; Cernuda I; Cervelli F; Chae MJ; Chang YH; Chen AI; Chen CR; Chen H; Cheng GM; Chen HS; Cheng L; Chernoplyiokov N; Chikanian A; Choumilov E; Choutko V; Chung CH; Clark C; Clavero R; Coignet G; Commichau V; Consolandi C; Contin A; Corti C; Dios MTC; Coste B; Crespo D; Cui Z; Dai M; Delgado C; Della Torre S; Demirkoz B; Dennett P; Derome L; Di Falco S; Diao XH; Diago A; Djambazov L; Diaz C; von Doetinchem P; Du WJ; Dubois JM; Duperay R; Duranti M; D'Urso D ;Egorov A; Eline A; Eppling FJ; Eronen T; van Es J; Esser H; Falvard A; Fiandrini E; Fiasson A; Finch E; Fisher P; Flood K; Foglio R; Fohey M; Fopp S; Fouque N; Galaktionov Y; Gallilee M; Gallin-Martel L; Gallucci G; Garcia B; Garcia J; Garcia-Lopez R; Garcia-Tabares L; Gargiulo C; Gast H; Gebauer I; Gentile S; Gervasi M; Gillard W; Giovacchini F; Girard L; Goglov P; Gong J; Goy-Henningsen C; Grandi D; Graziani M; Grechko A; Gross A; Guerri I; de la Guia C; Guo KH; Habiby M; Haino S; Hauler F; He ZH; Heil M; Heilig J; Hermel R; Hofer H; Huang ZC; Hungerford W; Incagli M; Ionica M; Jacholkowska A; Jang WY; Jinchi H; Jongmanns M; Journet L; Jungermann L; Karpinski W; Kim GN; Kim KS; Kirn T; Kossakowski R; Koulemzine A; Kounina O; Kounine A; Koutsenko V; Krafczyk MS; Laudi E; Laurenti G; Lauritzen C; Lebedev A; Lee MW; Lee SC; Leluc C; Vargas HL; Lepareur V; Li JQ; Li Q; Li TX; Li W; Li ZH; Lipari P; Lin CH; Liu D; Liu H; Lomtadze T; Lu YS; Lucidi S; Lubelsmeyer K; Luo JZ; Lustermann W; Lv S; Madsen J; Majka R; Malinin A; Mana C; Marin J; Martin T; Martinez G; Masciocchi F; Masi N; Maurin D; McInturff A; McIntyre P; Menchaca-Rocha A; Meng Q; Menichelli M; Mereu I; Millinger M; Mo DC; Molina M; Mott P; Mujunen A; Natale S; Nemeth P; Ni JQ; Nikonov N; Nozzoli F; Nunes P; Obermeier A; Oh S; Oliva A; Palmonari F; Palomares C; Paniccia M; Papi A; Park WH; Pauluzzi M; Pauss F; Pauw A; Pedreschi E; Pensotti S; Pereira R; Perrin E; Pessina G; Pierschel G; Pilo F; Piluso A; Pizzolotto C; Plyaskin V; Pochon J; Pohl M; Poireau V; Porter S; Pouxe J; Putze A; Quadrani L; Qi XN; Rancoita PG; Rapin D; Ren ZL; Ricol JS; Riihonen E; Rodriguez I; Roeser U; Rosier-Lees S; Rossi L; Rozhkov A; Rozza D ;Sabellek A; Sagdeev R; Sandweiss J; Santos B; Saouter P; Sarchioni M; Schael S; Schinzel D; Schmanau M; Schwering G; von Dratzig AS; Scolieri G; Seo ES; Shan BS; Shi JY; Shi YM; Siedenburg T; Siedling R; Son D; Spada F; Spinella F; Steuer M; Stiff K; Sun W; Sun WH; Sun XH; Tacconi M; Tang CP; Tang XW; Tang ZC; Tao L; Tassan-Viol J; Ting SCC; Ting SM; Titus C; Tomassetti N; Toral F; Torsti J; Tsai JR; Tutt JC; Ulbricht J; Urban T; Vagelli V; Valente E; Vannini C; Valtonen E; Trevino MV; Vaurynovich S; Vecchi M; Vergain M; Verlaat B; Vescovi C; Vialle JP; Viertel G; Volpini G; Wang D; Wang NH; Wang QL; Wang RS; Wang X; Wang ZX; Wallraff W; Weng ZL; Willenbrock M; Wlochal M; Wu H; Wu KY; Wu ZS; Xiao WJ; 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 JG; Zhang Z; Zhang MM; Zheng ZM; Zhuang HL; Zhukov V; Zichichi A; Zuccon P; Zurbach C
2013-01-01
Abstract
A precision measurement by the Alpha Magnetic Spectrometer on the International Space Station of the positron fraction in primary cosmic rays in the energy range from 0.5 to 350 GeV based on 6.8 x 10(6) positron and electron events is presented. The very accurate data show that the positron fraction is steadily increasing from 10 to similar to 250 GeV, but, from 20 to 250 GeV, the slope decreases by an order of magnitude. The positron fraction spectrum shows no fine structure, and the positron to electron ratio shows no observable anisotropy. Together, these features show the existence of new physical phenomena. DOI: 10.1103/PhysRevLett.110.141102
Citazione
First Result from the Alpha Magnetic Spectrometer on the International Space Station: Precision Measurement of the Positron Fraction in Primary Cosmic Rays of 0.5-350 GeV / Aguilar, M; Alberti, G; Alpat, B; Alvino, A; Ambrosi, G; Andeen, K; Anderhub, H; Arruda, L; Azzarello, P; Bachlechner, A; Barao, F; Baret, B; Barrau, A; Barrin, L; Bartoloni, A; Basara, L; Basili, A; Batalha, L; Bates, J; Battiston, R; Bazo, J; Becker, R; Becker, U; Behlmann, M; Beischer, B; Berdugo, J; Berges, P; Bertucci, B; Bigongiari, G; Biland, A; Bindi, V; Bizzaglia, S; Boella, G; de Boer, W; Bollweg, K; Bolmont, J; Borgia, B; Borsini, S; Boschini, Mj; Boudoul, G; Bourquin, M; Brun, P; Buenerd, M; Burger, J; Burger, W; Cadoux, F; Cai, Xd; Capell, M; Casadei, D; Casaus, J; Cascioli, V; Castellini, G; Cernuda, I; Cervelli, F; Chae, Mj; Chang, Yh; Chen, Ai; Chen, Cr; Chen, H; Cheng, Gm; Chen, Hs; Cheng, L; Chernoplyiokov, N; Chikanian, A; Choumilov, E; Choutko, V; Chung, Ch; Clark, C; Clavero, R; Coignet, G; Commichau, V; Consolandi, C; Contin, A; Corti, C; Dios, Mtc; Coste, B; Crespo, D; Cui, Z; Dai, M; Delgado, C; Della Torre, S; Demirkoz, B; Dennett, P; Derome, L; Di Falco, S; Diao, Xh; Diago, A; Djambazov, L; Diaz, C; von Doetinchem, P; Du, Wj; Dubois, Jm; Duperay, R; Duranti, M; D'Urso, D; Egorov, A; Eline, A; Eppling, Fj; Eronen, T; van Es, J; Esser, H; Falvard, A; Fiandrini, E; Fiasson, A; Finch, E; Fisher, P; Flood, K; Foglio, R; Fohey, M; Fopp, S; Fouque, N; Galaktionov, Y; Gallilee, M; Gallin-Martel, L; Gallucci, G; Garcia, B; Garcia, J; Garcia-Lopez, R; Garcia-Tabares, L; Gargiulo, C; Gast, H; Gebauer, I; Gentile, S; Gervasi, M; Gillard, W; Giovacchini, F; Girard, L; Goglov, P; Gong, J; Goy-Henningsen, C; Grandi, D; Graziani, M; Grechko, A; Gross, A; Guerri, I; de la Guia, C; Guo, Kh; Habiby, M; Haino, S; Hauler, F; He, Zh; Heil, M; Heilig, J; Hermel, R; Hofer, H; Huang, Zc; Hungerford, W; Incagli, M; Ionica, M; Jacholkowska, A; Jang, Wy; Jinchi, H; Jongmanns, M; Journet, L; Jungermann, L; Karpinski, W; Kim, Gn; Kim, Ks; Kirn, T; Kossakowski, R; Koulemzine, A; Kounina, O; Kounine, A; Koutsenko, V; Krafczyk, Ms; Laudi, E; Laurenti, G; Lauritzen, C; Lebedev, A; Lee, Mw; Lee, Sc; Leluc, C; Vargas, Hl; Lepareur, V; Li, Jq; Li, Q; Li, Tx; Li, W; Li, Zh; Lipari, P; Lin, Ch; Liu, D; Liu, H; Lomtadze, T; Lu, Ys; Lucidi, S; Lubelsmeyer, K; Luo, Jz; Lustermann, W; Lv, S; Madsen, J; Majka, R; Malinin, A; Mana, C; Marin, J; Martin, T; Martinez, G; Masciocchi, F; Masi, N; Maurin, D; Mcinturff, A; Mcintyre, P; Menchaca-Rocha, A; Meng, Q; Menichelli, M; Mereu, I; Millinger, M; Mo, Dc; Molina, M; Mott, P; Mujunen, A; Natale, S; Nemeth, P; Ni, Jq; Nikonov, N; Nozzoli, F; Nunes, P; Obermeier, A; Oh, S; Oliva, A; Palmonari, F; Palomares, C; Paniccia, M; Papi, A; Park, Wh; Pauluzzi, M; Pauss, F; Pauw, A; Pedreschi, E; Pensotti, S; Pereira, R; Perrin, E; Pessina, G; Pierschel, G; Pilo, F; Piluso, A; Pizzolotto, C; Plyaskin, V; Pochon, J; Pohl, M; Poireau, V; Porter, S; Pouxe, J; Putze, A; Quadrani, L; Qi, Xn; Rancoita, Pg; Rapin, D; Ren, Zl; Ricol, Js; Riihonen, E; Rodriguez, I; Roeser, U; Rosier-Lees, S; Rossi, L; Rozhkov, A; Rozza, D; Sabellek, A; Sagdeev, R; Sandweiss, J; Santos, B; Saouter, P; Sarchioni, M; Schael, S; Schinzel, D; Schmanau, M; Schwering, G; von Dratzig, As; Scolieri, G; Seo, Es; Shan, Bs; Shi, Jy; Shi, Ym; Siedenburg, T; Siedling, R; Son, D; Spada, F; Spinella, F; Steuer, M; Stiff, K; Sun, W; Sun, Wh; Sun, Xh; Tacconi, M; Tang, Cp; Tang, Xw; Tang, Zc; Tao, L; Tassan-Viol, J; Ting, Scc; Ting, Sm; Titus, C; Tomassetti, N; Toral, F; Torsti, J; Tsai, Jr; Tutt, Jc; Ulbricht, J; Urban, T; Vagelli, V; Valente, E; Vannini, C; Valtonen, E; Trevino, Mv; Vaurynovich, S; Vecchi, M; Vergain, M; Verlaat, B; Vescovi, C; Vialle, Jp; Viertel, G; Volpini, G; Wang, D; Wang, Nh; Wang, Ql; Wang, Rs; Wang, X; Wang, Zx; Wallraff, W; Weng, Zl; Willenbrock, M; Wlochal, M; Wu, H; Wu, Ky; Wu, Zs; Xiao, Wj; 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, Jg; Zhang, Z; Zhang, Mm; Zheng, Zm; Zhuang, Hl; Zhukov, V; Zichichi, A; Zuccon, P; Zurbach, C. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 110:14(2013). [10.1103/PhysRevLett.110.141102]
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