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Title: ISOTOPIC COMPOSITION OF THE LO ENERGY HELIUM NUCLEI IN THE PRIMARY COSMIC RADIATION

Abstract

The isotopic composition of low-energy helium nuclei in the primary cosmic radiation is determined by using the "constant sagitta" scattering method on tracks of helium nuclei stopping in a nuclear-emulsion stack flown at a geomagnetic latitude of 55 deg N and at a mean atmospheric depth of 8.5 g/cm/sup 2/; tracks with zenith angles less than 30 deg are accepted. The ratio of He/ sup 3//(He/sup 3/ + He4) for the same energy per nucleon (between 200 and 400 Mev) is found to be 0.41 plus or minus 0.09 at flight altitude. The correction for production of secondary He/sup 3/ in the residual atmosphere is calculated to be 4%. If one assumes that no He/sup 3/ nuclei are present at the source, the observed ratio corresponds to a traversal of 14 plus or minus 3 g of interstellar matter by the lowenergy helium nuclei. The value of He/sup 3//(He/ sup 3/ + He/sup 4/) corresponding to the same magnetic rigidity (between 1.3 and 1.6 Bv) is found to be 0.36 plus or minus 0.11 which corresponds to a traversal of 12.2 plus or minus 3.5 g of interstellar matter. The observed ratio may indicate the presence of He/sup 3/ atmore » the source of cosmic rays, or may be a reflection of local production within the solar system. (auth)« less

Authors:
Publication Date:
Research Org.:
Univ. of Rochester, N.Y.
OSTI Identifier:
4029703
Report Number(s):
NYO-9553
Journal ID: PHRVA; 0031-899X
NSA Number:
NSA-15-024198
Resource Type:
Journal Article
Journal Name:
Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
Additional Journal Information:
Journal Volume: Vol: 123; Other Information: NYO-9553. Orig. Receipt Date: 31-DEC-61
Country of Publication:
Country unknown/Code not available
Language:
English
Subject:
PHYSICS; ANGULAR DISTRIBUTION; BALLOONS; COSMIC RADIATION; EARTH; ENERGY RANGE; FISSION; GEOMAGNETIC COORDINATES; HELIUM 3; HELIUM 4; HELIUM ISOTOPES; HYDROGEN; INTERACTIONS; LEVELS; MAGNETIC FIELDS; MEASURED VALUES; MOMENTUM; NUCLEAR EMULSIONS; NUCLEI; PARTICLE TRACKS; PRIMARY COSMIC RADIATION; QUANTITY RATIO; RADIATION SOURCES; SCATTERING; SPACE; STARS; STRATOSPHERE

Citation Formats

Rao Appa, M V.K. ISOTOPIC COMPOSITION OF THE LO ENERGY HELIUM NUCLEI IN THE PRIMARY COSMIC RADIATION. Country unknown/Code not available: N. p., 1961. Web. doi:10.1103/PhysRev.123.295.
Rao Appa, M V.K. ISOTOPIC COMPOSITION OF THE LO ENERGY HELIUM NUCLEI IN THE PRIMARY COSMIC RADIATION. Country unknown/Code not available. doi:10.1103/PhysRev.123.295.
Rao Appa, M V.K. Sat . "ISOTOPIC COMPOSITION OF THE LO ENERGY HELIUM NUCLEI IN THE PRIMARY COSMIC RADIATION". Country unknown/Code not available. doi:10.1103/PhysRev.123.295.
@article{osti_4029703,
title = {ISOTOPIC COMPOSITION OF THE LO ENERGY HELIUM NUCLEI IN THE PRIMARY COSMIC RADIATION},
author = {Rao Appa, M V.K.},
abstractNote = {The isotopic composition of low-energy helium nuclei in the primary cosmic radiation is determined by using the "constant sagitta" scattering method on tracks of helium nuclei stopping in a nuclear-emulsion stack flown at a geomagnetic latitude of 55 deg N and at a mean atmospheric depth of 8.5 g/cm/sup 2/; tracks with zenith angles less than 30 deg are accepted. The ratio of He/ sup 3//(He/sup 3/ + He4) for the same energy per nucleon (between 200 and 400 Mev) is found to be 0.41 plus or minus 0.09 at flight altitude. The correction for production of secondary He/sup 3/ in the residual atmosphere is calculated to be 4%. If one assumes that no He/sup 3/ nuclei are present at the source, the observed ratio corresponds to a traversal of 14 plus or minus 3 g of interstellar matter by the lowenergy helium nuclei. The value of He/sup 3//(He/ sup 3/ + He/sup 4/) corresponding to the same magnetic rigidity (between 1.3 and 1.6 Bv) is found to be 0.36 plus or minus 0.11 which corresponds to a traversal of 12.2 plus or minus 3.5 g of interstellar matter. The observed ratio may indicate the presence of He/sup 3/ at the source of cosmic rays, or may be a reflection of local production within the solar system. (auth)},
doi = {10.1103/PhysRev.123.295},
journal = {Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D},
number = ,
volume = Vol: 123,
place = {Country unknown/Code not available},
year = {1961},
month = {7}
}