Advancing physics at next RIBF (ADRIB26)

A New “Skin Thickness” in High-spin Isomers as a Probe for Equation of State of Spin-polarized Matter

Not scheduled

20m

Nishina hall, Nishina Bldg.(E02 in the map), (RIKEN Wako campus)

Contributed talk

Speaker

Toi Tachibana (Department of Physics, Kyoto University)

Description

In T. Tachibana et al., Phys. Rev. C 112 (2025) 065806, the equation of state of spin-polarized nuclear matter was studied and the spin slope parameter of the corresponding spin-symmetry energy was discussed, which plays an important role in characterizing spin-dependent properties of nuclear systems.
To explore a possible experimental probe for constraining the spin slope parameter, we investigate a new type of “skin thickness” in high-spin isomers. In analogy with the well-known linear correlation between the neutron skin thickness and the slope parameter in nuclear matter, we examine the correlation between the “spin skin thickness” of the high-spin isomer of $^{52}$Fe and the spin slope parameter. For this purpose, two possible definitions of the spin skin thickness are introduced and analyzed within the framework of the relativistic density functional theory. We find that both definitions exhibit clear positive correlations with the spin slope parameter. Although the experimental observation of the spin skin thickness may be challenging, the present study suggests that high-spin isomers could provide a novel avenue for constraining spin-dependent properties of nuclear matter.