Seminarium Fizyki Jądra Atomowego

Beta-delayed neutron emission is the dominant decay mode of very neutron-rich nuclei produced during the rapid neutron capture process (r-process). This form of decay plays a key role determining the r-process path and affects the final abundance distribution in a complex way, shifting the distribution to lower masses, while it provides neutrons for late captures after the freeze-out with the opposite effect. Thus, a good knowledge of beta-delayed neutron emission probabilities and beta-decay half-lives is required for a meaningful comparison of r-process simulations with the observed elemental abundances. Furthermore, some of the nuclei involved in the r-process can emit more than one neutron in the decay. Our current understanding of the beta-delayed multiple neutron emission is incomplete because the scarcity of experimental data. Additionally, neutron emission probabilities are sensitive to the nuclear wave function and can be used as a test of nuclear structure studies.

With these ideas in mind the Beta-delayed neutrons at RIKEN (BRIKEN) Collaboration has set up a powerful detection system based on a state-on-the-art instrumentation, namely an implanted-ion and decay detector AIDA and a large neutron counter. The setup exploits the very intense secondary radioactive beams available at the end of the in-flight separator BigRIPS and ZeroDegree spectrometers, hosted in the RIKEN Nishina Center. The astrophysical impact of new experimental values for 38 nuclei around the doubly-magic nucleus obtained during the RIBF127 experiment will be shown.

Seminarium odbędzie się zdalnie na zoom-ie. Link jest dostępny od 10.00:
https://us02web.zoom.us/j/81630676206?pwd=TGhheWUwR3lLOFdtd0NFZW1VdnMyZz09