Department of Physics, Panjab University, Chandigarh, India

Department seminar

Time and date: 12 March 2012 (Monday), 4:00 PM
Venue: Seminar Hall

Title: Astrophysical reactions with stable and radioactive beams

Speaker: Prof. Michael Hass, Department of Particle Physics and Astrophysics, The Weizmann Institute of Science, Rehovot, Israel

Abstract: The study of nuclear reactions that are relevant to astrophysical issues plays a central role in the basic understanding of astrophysical phenomena and of the origin of the elements. One can discern two categories in this field: 1) The high-precision study of solar fusion reactions at low energy, using stable nuclear beams, in order to shed light on energy generation in the Sun, the solar neutrino issue and Big-Bang nucleo-synthesis. There has been significant progress in this field, resulting in a very good understanding of the relevant reactions, but yet more information is needed and is being produced in order to serve the need of modern neutrino experiments and "precision" neutrino physics. 2) Explosive nucleo-synthesis is one of the fore-front topics in nuclear astrophysics research. The study of the underlying nuclear reactions that govern astrophysical phenomena such as x-ray bursts and super-novae is essential for illuminating the nature and mechanism that trigger and power such objects. For example, reactions such as 14O(α,p)17F and 15O(α,γ)19Ne may relate to the breakout from the "hot-CNO cycle" into the "rp" (rapid proton capture) process with the production of medium mass proton-rich nuclei. Such studies require beams of short-lived radioactive isotopes at unprecedented intensities, and are hence closely linked to present and future large-scale "rare-isotopes" facilities. This talk will present a status report and future prospects of these separate, but closely related activities.