Speaker
Description
Deducing the neutron skin thickness, defined as the difference between the neutron and proton distribution radii ($r_n$ and $r_p$), is important for understanding the equation of state of neutron matter [1]. Reaction cross section ($\sigma_R$) measurements provide an effective experimental approach for determining nuclear radii. Based on the isospin asymmetry of the nucleon-nucleon cross-section, $\sigma_R$ measurements using proton and neutron targets are thought to be effective to extract $r_n$ and $r_p$ separately. However, the fabrication of a stable neutron target is not feasible.
We are developing a thick solid deuterium target (SDT) because a theoretical study suggests that $\sigma_R$ on a neutron target can be indirectly extracted from measurements of $\sigma_R$ on deuteron and proton targets [2]. To evaluate the performance of our SDT system, we measured nucleon removal cross sections of $^{90}$Sr at RIKEN RIBF. The present results are consistent with the data reported in Ref. [3], indicating the reliable performance of the SDT system. We will report the details of experimental method and the results.
Reference
[1] X. Roca-Maza et al., Phys. Rev. Lett. 206, 252501 (2011).
[2] W. Horiuchi et al., Phys. Rev. C 102, 054601 (2020).
[3] H. Wang et al., Phys. Lett.B754,104(2016).