Towards Understanding the Origin of Cosmic-Ray Positrons

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dc.contributor.authorWei J
dc.contributor.authorWeng ZL
dc.contributor.authorWu H
dc.contributor.authorXiong RQ
dc.contributor.authorXu W
dc.contributor.authorYan Q
dc.contributor.authorYang Y
dc.contributor.authorYi H
dc.contributor.authorYu YJ
dc.contributor.authorYu ZQ
dc.contributor.authorZannoni M
dc.contributor.authorZeissler S
dc.contributor.authorZhang C
dc.contributor.authorZhang F
dc.contributor.authorZhang JH
dc.contributor.authorZhang Z
dc.contributor.authorZhao F
dc.contributor.authorZheng ZM
dc.contributor.authorZhuang HL
dc.contributor.authorZhukov V
dc.contributor.authorZichichi A
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dc.contributor.authorZuccon P
dc.contributor.authorZuccon P
dc.contributor.authorZimmermann N
dc.contributor.authorZichichi A
dc.contributor.organizationfi=avaruustutkimuslaboratorio|en=Space Research Laboratory|
dc.contributor.organization-code1.2.246.10.2458963.20.47833719389
dc.contributor.organization-code2606702
dc.converis.publication-id39591573
dc.converis.urlhttps://research.utu.fi/converis/portal/Publication/39591573
dc.date.accessioned2022-10-28T12:21:36Z
dc.date.available2022-10-28T12:21:36Z
dc.description.abstractPrecision measurements of cosmic ray positrons are presented up to 1 TeV based on 1.9 million positrons collected by the Alpha Magnetic Spectrometer on the International Space Station. The positron flux exhibits complex energy dependence. Its distinctive properties are (a) a significant excess starting from 25.2 +/- 1.8 GeV compared to the lower-energy, power-law trend, (b) a sharp dropoff above 284(-64)(+91) GeV, (c) in the entire energy range the positron flux is well described by the sum of a term associated with the positrons produced in the collision of cosmic rays, which dominates at low energies, and a new source term of positrons, which dominates at high energies, and (d) a finite energy cutoff of the source term of E-s = 810(-180)(+310) GeV is established with a significance of more than 4 sigma. These experimental data on cosmic ray positrons show that, at high energies, they predominantly originate either from dark matter annihilation or from other astrophysical sources.
dc.identifier.eissn1079-7114
dc.identifier.jour-issn0031-9007
dc.identifier.olddbid176099
dc.identifier.oldhandle10024/159193
dc.identifier.urihttps://www.utupub.fi/handle/11111/30935
dc.identifier.urnURN:NBN:fi-fe2021042824275
dc.language.isoen
dc.okm.affiliatedauthorTorsti, Jarmo
dc.okm.affiliatedauthorValtonen, Eino
dc.okm.discipline115 Astronomy and space scienceen_GB
dc.okm.discipline115 Avaruustieteet ja tähtitiedefi_FI
dc.okm.internationalcopublicationinternational co-publication
dc.okm.internationalityInternational publication
dc.okm.typeA1 ScientificArticle
dc.publisherAMER PHYSICAL SOC
dc.publisher.countryUnited Statesen_GB
dc.publisher.countryYhdysvallat (USA)fi_FI
dc.publisher.country-codeUS
dc.relation.articlenumberARTN 041102
dc.relation.doi10.1103/PhysRevLett.122.041102
dc.relation.ispartofjournalPhysical Review Letters
dc.relation.issue4
dc.relation.volume122
dc.source.identifierhttps://www.utupub.fi/handle/10024/159193
dc.titleTowards Understanding the Origin of Cosmic-Ray Positrons
dc.year.issued2019

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