Speaker
Description
The weak r-process in core-collapse supernovae is a proposed source of intermediate-mass elements. Under the conditions where the neutrino-driven winds that drive the supernova explosion are slightly neutron-rich, it has been found that (α,n) reactions are the main driver of nucleosynthesis [1]. In contrast with the “main” r-process, nucleosynthesis in the weak r-process proceeds close to the line of stability making it possible to study these reactions using radioactive ion beam facilities. To date, only a few (α,n) reactions on intermediate-mass elements have been studied at the relevant energies.
Recently, experiments have been conducted at the TRIUMF ISAC-II facility, using the EMMA recoil mass spectrometer to separate reaction products from unreacted beam ions and the TIGRESS gamma-ray spectrometer array for coincident gamma ray detection. These studies looked at several (α,n) reactions, each having been identified as significant in astrophysical models of weak r-process nucleosynthesis [2]. This presentation will discuss results from these studies, reporting on measured partial cross-sections, from both the 86Kr(α,n)89Sr experiment and the 94Sr(α,n)97Zr and 93Sr(α,n)96Zr experiments with radioactive beams.
[1] Bliss et al. (2017) J. Phys. G: Nuclear. Part. Phys. 44 054003.
[2] Bliss et al. (2020) Phys. Rev. C. 101 055807.
| Email address | cangus@triumf.ca |
|---|---|
| Classification | Applications of radioactive ion beams |
