Search Publications
Progress on nuclear reaction rates affecting the stellar production of 26Al
Meynet, G.; Diehl, R.; Vink, J. S. +24 more
The radioisotope 26Al is a key observable for nucleosynthesis in the Galaxy and the environment of the early Solar System. To properly interpret the large variety of astronomical and meteoritic data, it is crucial to understand both the nuclear reactions involved in the production of 26Al in the relevant stellar sites and the…
Primordial black holes as a dark matter candidate
Kavanagh, Bradley J.; Green, Anne M.
The detection of gravitational waves from mergers of tens of Solar mass black hole binaries has led to a surge in interest in primordial black holes (PBHs) as a dark matter candidate. We aim to provide a (relatively) concise overview of the status of PBHs as a dark matter candidate, circa Summer 2020. First we review the formation of PBHs in the e…
Constraint on the cosmic age from the solar r-process abundances
Heng, T. H.; Xu, X. D.; Niu, Z. M. +2 more
The cosmic age is an important physical quantity in cosmology. Based on the radiometric method, a reliable lower limit of the cosmic age is derived to be 15.68+/- 1.94 Gyr, using the r-process abundances inferred for the solar system and observations in metal-poor stars. If the central value is taken, this value is larger than the latest cosmic ag…
COMMENT: Comment on 'Particle charge evolution during acceleration processes in solar flares' by M D Rodríguez-Frías, L del Peral and J Pérez-Peraza
Torsti, J.; Kocharov, L.; Kovaltsov, G. A.
Attention is drawn to the fact that results of the model obtained by Rodríguez-Frías et al are in conflict with both the straightforward physical consideration and the results of other models of charge-changing acceleration in solar flares. The numerical code given by Rodríguez-Frías et al generates an erroneous result that charge states of ions a…