Speaker
Description
Since the discovery of the kilonova GRB130603B (Tanvir et al. 2013) and the gravitational-wave event GW170817 (Villar et al. 2017), neutron-star mergers (NSMs) have been regarded as the leading candidates for the r-process nucleosynthesis site. Although MeV gamma rays from unstable r-process nuclei would provide direct evidence of the r-process site, their expected luminosities are very dim (Hotokezaka et al. 2016), falling below the sensitivities of current high-energy astronomical missions. An alternative strategy is to search for nearby Galactic NSMs using long-lived r-process nuclei (Terada et al. 2022), which can in turn constrain the local NSM event rate. However, the required sensitivity remains beyond the sensitivity of present and near-future gamma-ray missions. A more promising approach is to target internal-conversion X-rays (ICX) from r-process nuclei through high-resolution X-ray spectroscopy with the latest observatory, XRISM, focusing on multiple NSM remnants in globular clusters. In our presentation, we will show the detailed feasibility of X-ray observations and prospects.
| Category | Observation |
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