Ponente
Descripción
Nucleosynthesis in the rapid proton-capture process (rp-process) occurs in high-temperature, proton-rich environments, where nuclei rapidly capture protons and
undergo beta decay to form heavier elements. "Waiting points" emerge when proton captures become energetically unfavorable, temporarily halting nucleosynthesis until beta decay takes place.
These waiting points can be by-passed by sequential two-proton capture reactions through resonances. To understand the significance of waiting points, measurements of the Q-value as well as spin and parity assignments for resonances are crucial. For example, while several studies on the unbound 69Br related to the 68Se waiting point have been conducted, the results remain partially contradictory. For the next waiting point at 72Kr, such measurements have not yet been performed. We propose to investigate beta-delayed proton emissions from 69Br and 73Rb, as well as the recently discovered "sandbank" nuclei 68Br and 72Rb. These studies will provide new insights into the rp-process nucleosynthesis path and may revise our understanding of its endpoint, potentially indicating that it terminates with lighter nuclei than previously expected if the bypassing of waiting points is significantly hindered.
