File Download
Links for fulltext
(May Require Subscription)
- Publisher Website: 10.1103/PhysRevLett.123.181102
- Scopus: eid_2-s2.0-85074894958
- PMID: 31763896
- WOS: WOS:000493903400004
- Find via
Supplementary
- Citations:
- Appears in Collections:
Article: Properties of cosmic helium isotopes measured by the alpha magnetic spectrometer
Title | Properties of cosmic helium isotopes measured by the alpha magnetic spectrometer |
---|---|
Authors | |
Issue Date | 2019 |
Publisher | American Physical Society. The Journal's web site is located at https://journals.aps.org/prl/ |
Citation | Physical Review Letters, 2019, v. 123 n. 18, p. article no. 181102 How to Cite? |
Abstract | Precision measurements by the Alpha Magnetic Spectrometer (AMS) on the International Space Station of He3 and He4 fluxes are presented. The measurements are based on 100 million He4 nuclei in the rigidity range from 2.1 to 21 GV and 18 million He3 from 1.9 to 15 GV collected from May 2011 to November 2017. We observed that the He3 and He4 fluxes exhibit nearly identical variations with time. The relative magnitude of the variations decreases with increasing rigidity. The rigidity dependence of the He3/He4 flux ratio is measured for the first time. Below 4 GV, the He3/He4 flux ratio was found to have a significant long-term time dependence. Above 4 GV, the He3/He4 flux ratio was found to be time independent, and its rigidity dependence is well described by a single power law ∈RΔ with Δ=-0.294±0.004. Unexpectedly, this value is in agreement with the B/O and B/C spectral indices at high energies. © 2019 authors. Published by the American Physical Society. |
Persistent Identifier | http://hdl.handle.net/10722/293386 |
ISSN | 2023 Impact Factor: 8.1 2023 SCImago Journal Rankings: 3.040 |
ISI Accession Number ID |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Wang, LQ | - |
dc.contributor.author | AMS Collaboration | - |
dc.date.accessioned | 2020-11-23T08:16:00Z | - |
dc.date.available | 2020-11-23T08:16:00Z | - |
dc.date.issued | 2019 | - |
dc.identifier.citation | Physical Review Letters, 2019, v. 123 n. 18, p. article no. 181102 | - |
dc.identifier.issn | 0031-9007 | - |
dc.identifier.uri | http://hdl.handle.net/10722/293386 | - |
dc.description.abstract | Precision measurements by the Alpha Magnetic Spectrometer (AMS) on the International Space Station of He3 and He4 fluxes are presented. The measurements are based on 100 million He4 nuclei in the rigidity range from 2.1 to 21 GV and 18 million He3 from 1.9 to 15 GV collected from May 2011 to November 2017. We observed that the He3 and He4 fluxes exhibit nearly identical variations with time. The relative magnitude of the variations decreases with increasing rigidity. The rigidity dependence of the He3/He4 flux ratio is measured for the first time. Below 4 GV, the He3/He4 flux ratio was found to have a significant long-term time dependence. Above 4 GV, the He3/He4 flux ratio was found to be time independent, and its rigidity dependence is well described by a single power law ∈RΔ with Δ=-0.294±0.004. Unexpectedly, this value is in agreement with the B/O and B/C spectral indices at high energies. © 2019 authors. Published by the American Physical Society. | - |
dc.language | eng | - |
dc.publisher | American Physical Society. The Journal's web site is located at https://journals.aps.org/prl/ | - |
dc.relation.ispartof | Physical Review Letters | - |
dc.rights | Copyright [2019] by The American Physical Society. This article is available online at [http://dx.doi.org/10.1103/PhysRevLett.123.181102]. | - |
dc.rights | This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. | - |
dc.title | Properties of cosmic helium isotopes measured by the alpha magnetic spectrometer | - |
dc.type | Article | - |
dc.identifier.email | Wang, L: lqwang@hku.hk | - |
dc.identifier.authority | Wang, L=rp00184 | - |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.1103/PhysRevLett.123.181102 | - |
dc.identifier.pmid | 31763896 | - |
dc.identifier.scopus | eid_2-s2.0-85074894958 | - |
dc.identifier.hkuros | 319553 | - |
dc.identifier.volume | 123 | - |
dc.identifier.issue | 18 | - |
dc.identifier.spage | article no. 181102 | - |
dc.identifier.epage | article no. 181102 | - |
dc.identifier.isi | WOS:000493903400004 | - |
dc.publisher.place | United States | - |
dc.identifier.issnl | 0031-9007 | - |