Measurement of the secondary radionuclides 10Be, 26Al, 36Cl, 54Mn, and 14C and implications for the galactic cosmic-ray age

Nathan Eugene Yanasak, M. E. Wiedenbeck, R. A. Mewaldt, A. J. Davis, A. C. Cummings, J. S. George, R. A. Leske, E. C. Stone, E. R. Christian, T. T. Von Rosenvinge, W. R. Binns, P. L. Hink, M. H. Israel

Research output: Contribution to journalArticle

120 Citations (Scopus)

Abstract

We report on abundance measurements of 10Be, 26Al, 36Cl, and 54Mn in the Galactic cosmic rays (GCRs) using the Cosmic-Ray Isotope Spectrometer (CRIS) instrument aboard the Advanced Composition Explorer spacecraft at energies from ∼70 to ∼400 MeV nucleon-1. We also report an upper limit on the abundance of GCR 14C. The high statistical significance of these measurements allows the energy dependence of their relative abundances to be studied. A steady-state, leaky-box propagation model, incorporating observations of the local interstellar medium (ISM) composition and density and recent partial fragmentation cross section measurements, is used to interpret these abundances. Using this model, the individual galactic confinement times derived using data for each species are consistent with a unique confinement time value of τesc = 15.0 ± 1.6 Myr. The CRIS abundance measurements are consistent with propagation through an average ISM hydrogen number density nH = 0.34 ± 0.04 H atoms cm-3. The surviving fractions, f, for each radioactive species have been calculated. From predictions of the diffusion models of Ptuskin & Soutoul, the values of f indicate an interstellar cosmic-ray diffusion coefficient of D = (3.5 ± 2.0) × 1028 cm2 s-1.

Original languageEnglish (US)
Pages (from-to)768-792
Number of pages25
JournalAstrophysical Journal
Volume563
Issue number2 PART 1
DOIs
StatePublished - Dec 20 2001

Fingerprint

radioactive isotopes
cosmic ray
radionuclide
cosmic rays
spectrometer
isotopes
Advanced Composition Explorer
isotope
spectrometers
propagation
energy
boxes
relative abundance
fragmentation
spacecraft
diffusion coefficient
cross section
hydrogen
cross sections
prediction

Keywords

  • Cosmic rays
  • Galaxy: general
  • Galaxy: halo
  • ISM: abundances

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Yanasak, N. E., Wiedenbeck, M. E., Mewaldt, R. A., Davis, A. J., Cummings, A. C., George, J. S., ... Israel, M. H. (2001). Measurement of the secondary radionuclides 10Be, 26Al, 36Cl, 54Mn, and 14C and implications for the galactic cosmic-ray age. Astrophysical Journal, 563(2 PART 1), 768-792. https://doi.org/10.1086/323842

Measurement of the secondary radionuclides 10Be, 26Al, 36Cl, 54Mn, and 14C and implications for the galactic cosmic-ray age. / Yanasak, Nathan Eugene; Wiedenbeck, M. E.; Mewaldt, R. A.; Davis, A. J.; Cummings, A. C.; George, J. S.; Leske, R. A.; Stone, E. C.; Christian, E. R.; Von Rosenvinge, T. T.; Binns, W. R.; Hink, P. L.; Israel, M. H.

In: Astrophysical Journal, Vol. 563, No. 2 PART 1, 20.12.2001, p. 768-792.

Research output: Contribution to journalArticle

Yanasak, NE, Wiedenbeck, ME, Mewaldt, RA, Davis, AJ, Cummings, AC, George, JS, Leske, RA, Stone, EC, Christian, ER, Von Rosenvinge, TT, Binns, WR, Hink, PL & Israel, MH 2001, 'Measurement of the secondary radionuclides 10Be, 26Al, 36Cl, 54Mn, and 14C and implications for the galactic cosmic-ray age', Astrophysical Journal, vol. 563, no. 2 PART 1, pp. 768-792. https://doi.org/10.1086/323842
Yanasak, Nathan Eugene ; Wiedenbeck, M. E. ; Mewaldt, R. A. ; Davis, A. J. ; Cummings, A. C. ; George, J. S. ; Leske, R. A. ; Stone, E. C. ; Christian, E. R. ; Von Rosenvinge, T. T. ; Binns, W. R. ; Hink, P. L. ; Israel, M. H. / Measurement of the secondary radionuclides 10Be, 26Al, 36Cl, 54Mn, and 14C and implications for the galactic cosmic-ray age. In: Astrophysical Journal. 2001 ; Vol. 563, No. 2 PART 1. pp. 768-792.
@article{f690724fa3fd4e9e81b18321cdcb0bb1,
title = "Measurement of the secondary radionuclides 10Be, 26Al, 36Cl, 54Mn, and 14C and implications for the galactic cosmic-ray age",
abstract = "We report on abundance measurements of 10Be, 26Al, 36Cl, and 54Mn in the Galactic cosmic rays (GCRs) using the Cosmic-Ray Isotope Spectrometer (CRIS) instrument aboard the Advanced Composition Explorer spacecraft at energies from ∼70 to ∼400 MeV nucleon-1. We also report an upper limit on the abundance of GCR 14C. The high statistical significance of these measurements allows the energy dependence of their relative abundances to be studied. A steady-state, leaky-box propagation model, incorporating observations of the local interstellar medium (ISM) composition and density and recent partial fragmentation cross section measurements, is used to interpret these abundances. Using this model, the individual galactic confinement times derived using data for each species are consistent with a unique confinement time value of τesc = 15.0 ± 1.6 Myr. The CRIS abundance measurements are consistent with propagation through an average ISM hydrogen number density nH = 0.34 ± 0.04 H atoms cm-3. The surviving fractions, f, for each radioactive species have been calculated. From predictions of the diffusion models of Ptuskin & Soutoul, the values of f indicate an interstellar cosmic-ray diffusion coefficient of D = (3.5 ± 2.0) × 1028 cm2 s-1.",
keywords = "Cosmic rays, Galaxy: general, Galaxy: halo, ISM: abundances",
author = "Yanasak, {Nathan Eugene} and Wiedenbeck, {M. E.} and Mewaldt, {R. A.} and Davis, {A. J.} and Cummings, {A. C.} and George, {J. S.} and Leske, {R. A.} and Stone, {E. C.} and Christian, {E. R.} and {Von Rosenvinge}, {T. T.} and Binns, {W. R.} and Hink, {P. L.} and Israel, {M. H.}",
year = "2001",
month = "12",
day = "20",
doi = "10.1086/323842",
language = "English (US)",
volume = "563",
pages = "768--792",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "2 PART 1",

}

TY - JOUR

T1 - Measurement of the secondary radionuclides 10Be, 26Al, 36Cl, 54Mn, and 14C and implications for the galactic cosmic-ray age

AU - Yanasak, Nathan Eugene

AU - Wiedenbeck, M. E.

AU - Mewaldt, R. A.

AU - Davis, A. J.

AU - Cummings, A. C.

AU - George, J. S.

AU - Leske, R. A.

AU - Stone, E. C.

AU - Christian, E. R.

AU - Von Rosenvinge, T. T.

AU - Binns, W. R.

AU - Hink, P. L.

AU - Israel, M. H.

PY - 2001/12/20

Y1 - 2001/12/20

N2 - We report on abundance measurements of 10Be, 26Al, 36Cl, and 54Mn in the Galactic cosmic rays (GCRs) using the Cosmic-Ray Isotope Spectrometer (CRIS) instrument aboard the Advanced Composition Explorer spacecraft at energies from ∼70 to ∼400 MeV nucleon-1. We also report an upper limit on the abundance of GCR 14C. The high statistical significance of these measurements allows the energy dependence of their relative abundances to be studied. A steady-state, leaky-box propagation model, incorporating observations of the local interstellar medium (ISM) composition and density and recent partial fragmentation cross section measurements, is used to interpret these abundances. Using this model, the individual galactic confinement times derived using data for each species are consistent with a unique confinement time value of τesc = 15.0 ± 1.6 Myr. The CRIS abundance measurements are consistent with propagation through an average ISM hydrogen number density nH = 0.34 ± 0.04 H atoms cm-3. The surviving fractions, f, for each radioactive species have been calculated. From predictions of the diffusion models of Ptuskin & Soutoul, the values of f indicate an interstellar cosmic-ray diffusion coefficient of D = (3.5 ± 2.0) × 1028 cm2 s-1.

AB - We report on abundance measurements of 10Be, 26Al, 36Cl, and 54Mn in the Galactic cosmic rays (GCRs) using the Cosmic-Ray Isotope Spectrometer (CRIS) instrument aboard the Advanced Composition Explorer spacecraft at energies from ∼70 to ∼400 MeV nucleon-1. We also report an upper limit on the abundance of GCR 14C. The high statistical significance of these measurements allows the energy dependence of their relative abundances to be studied. A steady-state, leaky-box propagation model, incorporating observations of the local interstellar medium (ISM) composition and density and recent partial fragmentation cross section measurements, is used to interpret these abundances. Using this model, the individual galactic confinement times derived using data for each species are consistent with a unique confinement time value of τesc = 15.0 ± 1.6 Myr. The CRIS abundance measurements are consistent with propagation through an average ISM hydrogen number density nH = 0.34 ± 0.04 H atoms cm-3. The surviving fractions, f, for each radioactive species have been calculated. From predictions of the diffusion models of Ptuskin & Soutoul, the values of f indicate an interstellar cosmic-ray diffusion coefficient of D = (3.5 ± 2.0) × 1028 cm2 s-1.

KW - Cosmic rays

KW - Galaxy: general

KW - Galaxy: halo

KW - ISM: abundances

UR - http://www.scopus.com/inward/record.url?scp=4244031093&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=4244031093&partnerID=8YFLogxK

U2 - 10.1086/323842

DO - 10.1086/323842

M3 - Article

VL - 563

SP - 768

EP - 792

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2 PART 1

ER -