|Author||Rao Appa, M. V. K.|
|Source||United States Department of Energy Office of Scientific and Technical Information|
|Subject Keyword||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|
|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/ at the source of cosmic rays, or may be a reflection of local production within the solar system. (auth)|
|Learning Resource Type||Article|
|Publisher Department||Univ. of Rochester, N.Y.|
|Technical Publication No.||NYO-9553|
|Organization||Univ. of Rochester, N.Y.|
Ministry of Human Resource Development (MHRD) under its National Mission on Education through Information and Communication Technology (NMEICT) has initiated the National Digital Library of India (NDLI) project to develop a framework of virtual repository of learning resources with a single-window search facility. Filtered and federated searching is employed to facilitate focused searching so that learners can find out the right resource with least effort and in minimum time. NDLI is designed to hold content of any language and provides interface support for leading vernacular languages, (currently Hindi, Bengali and several other languages are available). It is designed to provide support for all academic levels including researchers and life-long learners, all disciplines, all popular forms of access devices and differently-abled learners. It is being developed to help students to prepare for entrance and competitive examinations, to enable people to learn and prepare from best practices from all over the world and to facilitate researchers to perform inter-linked exploration from multiple sources. It is being developed at Indian Institute of Technology Kharagpur.
NDLI is a conglomeration of freely available or institutionally contributed or donated or publisher managed contents. Almost all these contents are hosted and accessed from respective sources. The responsibility for authenticity, relevance, completeness, accuracy, reliability and suitability of these contents rests with the respective organization and NDLI has no responsibility or liability for these. Every effort is made to keep the NDLI portal up and running smoothly unless there are some unavoidable technical issues.
Ministry of Human Resource Development (MHRD), through its National Mission on Education through Information and Communication Technology (NMEICT), has sponsored and funded the National Digital Library of India (NDLI) project.
For any issue or feedback, please write to firstname.lastname@example.org