11 papers
LiBeB, O and Fe Evolution: Refractory Element and Cosmic Ray Transport Delays
R. Ramaty, B. Kozlovsky, R. E. Lingenfelter
Employing a Monte-Carlo based evolutionary code, we show that the delay of Fe deposition relative to O, due to the incorporation of supernova ejecta refractories in high velocity g…
LiBeB Evolution: Three Models
R. Ramaty, R. E. Lingenfelter, B. Kozlovsky
We consider the three principal LiBeB evolutionary models, CRI in which the cosmic-ray source at all epochs of Galactic evolution is the average ISM, CRI+LECR in which metal enrich…
Nonthermal X-Rays from the Galactic Ridge: a Tracer of Low Energy Cosmic Rays ?
V. Tatischeff, R. Ramaty, A. Valinia
A distinct low energy cosmic-ray component has been proposed to explain the essentially constant Be/Fe ratio at low metallicities. Atomic collisions of such low energy ions produce…
Spallogenic Light Elements and Cosmic-Ray Origin
R. Ramaty, R. E. Lingenfelter
Using a Monte Carlo code which incorporates the delayed mixing into the ISM of supernovae nucleosynthetic yields and ejecta kinetic energies (including events with very large energ…
Solar Flares: Gamma Rays
Reuven Ramaty, Natalie Mandzhavidze
We briefly review the theory of gamma ray production in solar flares and present the highlights of the observations and their implications. Specifically: (i) the gamma ray data sho…
Early Galactic Li, Be and B: Implications on Cosmic Ray Origin
Reuven Ramaty, Richard Lingenfelter
Be abundances of old, low metallicity halo stars have major implications on cosmic-ray origin, requiring acceleration out of fresh supernova ejecta. The observed, essentially const…