Results 21 to 30 of about 1,179,358 (368)

The cosmic-ray contribution to galactic abundances of the light elements: Interpretation of GCR LiBeB abundance measurements from ACE/CRIS [PDF]

, 2001
Inelastic collisions between the galactic cosmic rays (GCRs) and the interstellar medium (ISM) are responsible for producing essentially all of the light elements Li, Be, and B (LiBeB) observed in the cosmic rays.
Binns, W. R., Christian, E. R., Cummings, A. C., Davis, A. J., de Nolfo, G. A., George, J. S., Hink, P. L., Israel, M. H., Leske, R. A., Lijowski, M., Mewaldt, R. A., Stone, E. C., von Rosenvinge, T. T., Wiedenbeck, M. E., Yanasak, N. E.   +14 more
core   +1 more source

Oxygen isotopic ratios in cool R Coronae Borealis stars [PDF]

, 2010
We investigate the relationship between R Coronae Borealis (RCB) stars and hydrogen-deficient carbon (HdC) stars by measuring precise 16O/18O ratios for five cool RCB stars.
Alvarez, Asplund, Asplund, Asplund, Clayton, Clayton, Cottrell, D. A. García-Hernández, David L. Lambert, García-Hernández, Ken H. Hinkle, Kjell Eriksson, Lawson, N. Kameswara Rao, Pandey, Rao, Rao, Warner   +17 more
core   +3 more sources

Models for Galactic cosmic-ray propagation [PDF]

, 2001
A new numerical model of particle propagation in the Galaxy has been developed, which allows the study of cosmic-ray and gamma-ray production and propagation in 2D or 3D, including a full reaction network.
A.W. Strong, Anders, Bergström, Binns, Connell, Connell, Connell, Davis, DuVernois, DuVernois, DuVernois, DuVernois, Engelmann, Hareyama, Hesse, I.V. Moskalenko, Lukasiak, Lukasiak, Lukasiak, Moskalenko, Moskalenko, Orito, Ptuskin, Seo, Simon, Simpson, Stephens, Stochaj, Strong, Strong, Strong, Strong, Strong, Thayer, Webber, Webber, Webber, Webber, Yanasak   +38 more
core   +3 more sources

AGB Stars and Their Circumstellar Envelopes. I. the VULCAN Code

Universe, 2021
The interplay between AGB interiors and their outermost layers, where molecules and dust form, is a problem of high complexity. As a consequence, physical processes like mass loss, which depend on the chemistry of the circumstellar envelope, are often ...
Sergio Cristallo, Luciano Piersanti, David Gobrecht, Lucio Crivellari, Ambra Nanni   +4 more
doaj   +1 more source

Neon in interior of the asteroid Vesta and comparison with the terrestrial planets

Journal of Asian Earth Sciences: X, 2022
We investigate the neon isotopic composition and elemental abundance in eucrites and diogenites and compare them with the inventories from interiors of the terrestrial planets.
Satvika Jaiswal, Ramakant R. Mahajan, Mamata Ngangom   +2 more
doaj   +1 more source

Isotope abundance in platinum

Proceedings of the Indian Academy of Sciences - Section A, 1935
The relative abundance of the isotopes of platinum is estimated from an analysis of the microphotograms of the structure pattern of Pt I λ 3408·13 A (a3F4—z5D4°). Assuming a positive isotope shift, the isotopes of platinum with their relative abundance are as follows:— Mass Number .. 196 195 194 192 Relative abundance ..
Venkatesachar, B., Sibaiya, L.
openaire   +2 more sources

Isotopic Abundances in Comets [PDF]

Symposium - International Astronomical Union, 1987
It is belived that the unprocessed material of the solar nebula may be preserved in comets. Thus the data concerning the chemical composition and the abundance of stable isotopes in these primitive bodies are of some importance in cosmological and cosmogonical context.
openaire   +1 more source

The Chemical Evolution of Magnesium Isotopic Abundances in the Solar Neighbourhood [PDF]

Publications Astronomical Society of Australia, 2003
The abundance of the neutron-rich magnesium isotopes observed in metal-poor stars is explained quantitatively with a chemical evolution model of the local Galaxy that considers — for the first time — the metallicity-dependent contribution from ...
Y. Fenner, B. Gibson, H.-c. Lee, A. Karakas, J. Lattanzio, A. Chieffi, M. Limongi, D. University, U. Obs., M. University, Istituto di Astrofisica Spaziale, Cnr, I. Roma, U. Texas   +13 more
semanticscholar   +1 more source

Estimates of woody biomass and mixed effects improve isoscape predictions across a northern mixed forest

Frontiers in Ecology and Evolution, 2023
Contemporary methods used to predict isotopic variation at regional scales have yet to include underlying distributions of the abundance of isotopic substrates.
John L. Berini, John L. Berini, Bryan Runck, Jody Vogeler, David L. Fox, James D. Forester, James D. Forester   +6 more
doaj   +1 more source

E-Process - Its Components And Their Neutron Excesses [PDF]

, 1974
NSF GP-18335, GP-32051NASA NGR-44-006 ...
Arnett, W. David, Clayton, Donald D., Hainebac.Kem L., Woosley, S. E.   +3 more
core   +2 more sources