Speaker
Description
Determining the equation of state for nuclear matter is one of the primary goals in nuclear physics, and is essential for understanding the macroscopic properties of nuclear matter in equilibrium states in both finite systems (nuclei) and infinite systems (neutron stars). The objective of our study is to derive the density-dependent term L for the symmetry energy, focusing on the symmetry energy term based on the density difference between protons and neutrons, and deduce it from the isotope dependence of neutron skin thickness. To this end, we measured the interaction cross sections and the charge-changing cross sections of $^{63-81}$Cu at 260A MeV using the BigRIPS isotope separator at RIKEN RIBF. This allowed us to determine the nuclear matter radius from the interaction cross sections and the proton distribution radius from the charge-changing cross sections, and thus the neutron skin thickness from the difference between these two. However, for $^{63-81}$Cu, we used the proton distribution radius already measured by the isotope shift method, and for $^{79-81}$Cu, we will derive the proton distribution radius from the charge-changing cross section. In addition, the origin of the odd-even staggering effect of nuclei in the charge radius remains unclear, and insights from the staggering of both charge radius and matter radius of Cu isotopes are anticipated. In this presentation, we will discuss 1) the measurement results of the interaction and charge-changing cross sections of $^{63-81}$Cu, 2) the derived proton and neutron distribution radii, 3) the neutron skin thickness, and 4) the staggering in odd-even nuclei.
| Type of contribution | poster |
|---|---|
| Are you a student or postdoc? | yes |
