Properties of Cosmic Helium Isotopes Measured by the Alpha Magnetic Spectrometer

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dc.contributor.authorAguilar M
dc.contributor.authorCavasonza LA
dc.contributor.authorAmbrosi G
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dc.contributor.authorAcosta MV
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dc.contributor.authorVelasco M
dc.contributor.authorVialle JP
dc.contributor.authorWang LQ
dc.contributor.authorWang NH
dc.contributor.authorWang QL
dc.contributor.authorWang X
dc.contributor.authorWang XQ
dc.contributor.authorWang ZX
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
dc.contributor.authorZimmermann N
dc.contributor.authorZuccon P
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-id43848394
dc.converis.urlhttps://research.utu.fi/converis/portal/Publication/43848394
dc.date.accessioned2022-10-27T12:16:04Z
dc.date.available2022-10-27T12:16:04Z
dc.description.abstractPrecision measurements by the Alpha Magnetic Spectrometer (AMS) on the International Space Station of He-3 and He-4 fluxes are presented. The measurements are based on 100 million He-4 nuclei in the rigidity range from 2.1 to 21 GV and 18 million He-3 from 1.9 to 15 GV collected from May 2011 to November 2017. We observed that the He-3 and He-4 fluxes exhibit nearly identical variations with time. The relative magnitude of the variations decreases with increasing rigidity. The rigidity dependence of the He-3/He-4 flux ratio is measured for the first time. Below 4 GV, the He-3/He-4 flux ratio was found to have a significant long-term time dependence. Above 4 GV, the He-3/He-4 flux ratio was found to be time independent, and its rigidity dependence is well described by a single power law proportional to R-Delta with Delta = 0.294 0.004. Unexpectedly, this value is in agreement with the B/O and B/C spectral indices at high energies.
dc.identifier.eissn1079-7114
dc.identifier.jour-issn0031-9007
dc.identifier.olddbid174324
dc.identifier.oldhandle10024/157418
dc.identifier.urihttps://www.utupub.fi/handle/11111/34121
dc.identifier.urnURN:NBN:fi-fe2021042822873
dc.language.isoen
dc.okm.affiliatedauthorTorsti, Jarmo
dc.okm.affiliatedauthorVainio, Rami
dc.okm.affiliatedauthorValtonen, Eino
dc.okm.discipline114 Physical sciencesen_GB
dc.okm.discipline115 Astronomy and space scienceen_GB
dc.okm.discipline114 Fysiikkafi_FI
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 181102
dc.relation.doi10.1103/PhysRevLett.123.181102
dc.relation.ispartofjournalPhysical Review Letters
dc.relation.issue18
dc.relation.volume123
dc.source.identifierhttps://www.utupub.fi/handle/10024/157418
dc.titleProperties of Cosmic Helium Isotopes Measured by the Alpha Magnetic Spectrometer
dc.year.issued2019

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