Speaker
Description
The equation of state of nuclear matter plays essential roles not only in the nuclear structure and dynamics but also in the size and mass relation of neutron stars and in the dynamics of making and merging compact stars. Among various EoS parameters, the incompressibility (K) is particularly crucial as it directly reflects the sound velocity in nuclear matter and provides a robust constraint on the EoS with minimal model dependence.
However, determining the incompressibility presents unique challenges. The incompressibility of the nucleus differs from that of the the infinite matter due to finite-size and surface effects. Furthermore, the experimental access of the proton-neutron asymmetry is limited to the stable isotopes. Therefore Therefore, a comprehensive understanding requires the systematic determination of incompressibility across both stable and unstable nuclei.
The incompressibility of the nucleus can be calculated from the energy of isoscalar giant monopole resonance (ISGMR), which can be selectively populated by inelastic scattering of isoscalar probes such as alpha particles and deuterons. The measurements of the stable nuclei have been intensively performed at RCNP, while the measurements of the unstable nuclei have just started using the gaseous active target around the world. An active target CAT-M has been developed in Japan for inverse-kinematics experiments with high-intensity heavy ion beam, which enables us to perform the systematic measurement in a wide region of the nuclear chart.
In this paper, the recent activities on the measurement of the ISGMR in the world will be briefly reviewed and the development and recent activities with the CAT-M will be introduced.
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