This talk explores the effect of dark matter, captured by the strong gravity and high density of neutron stars, on the equation of state (EoS) of neutron stars. We establish a theoretical framework incorporating dark matter interactions and demonstrate potential modifications in the neutron star EoS. These theoretical modifications allow us to explore potential constraints on the properties of...
The 6He nucleus, as the lightest halo nucleus described well by an alpha particle and two weakly bound neutrons, which can be used as a reference for understanding other complex halo nuclei. In order to investigate the continnum effect of 6He excited state (2+) on elastic scattering and further explore the 6He halo structure and the correlation of two neutrons within 6He, the 6He + p...
We are attempting to derive the proton and neutron distribution radii by simultaneous measurements of the interaction cross sections and the charge-changing cross sections. The relationship between the proton distribution radius and the charge-changing cross section can be intuitively understood through geometric considerations. However, previous studies have revealed that the charge-changing...
The beta-delayed gamma-ray spectroscopy of neutron-rich Ru isotopes is investigated at the Radioactive Isotope Beam Factory of RIKEN. The beta-decay schemes of these nuclei are established with the use of prompt-prompt and prompt-delayed gamma-gamma-coincidence measurement by EURICA -ray detection array. The systematic trends of low-lying states and their implications on single-particle orbit...
In this work, we have studied the quartet correlations in the cold infinite symmetric nuclear matter. The hierarchical structure of in-medium cluster formations has been investigated. We have extended the Bardeen-Cooper-Schrieffer-type variational wave function to the systems also with quartet correlations, and discussed how various physical properties will be modified by the quartet...
Neutron stars are known to be one of the densest objects in the universe.
Information on condition in extreme dense matter, which is impossible to measure in the terrestrial experiments, can be obtained through astrophysical observation data.
In particular, the observation results from neutron stars are very useful to constraint the nuclear equation of state (E0S) at high densities.
There...
In some nuclei, a phenomenon called double beta decay, in which two nucleons simultaneously undergo beta decay, is known to occur rarely. In this case, two neutrinos are emitted. Neutrinos may be Majorana particles, which do not distinguish between particles and antiparticles among Fermi particles. In that case, double beta decay without neutrino emission ($0\nu\beta\beta$) may occur. If the...
Double-beta ($\beta\beta$) decay is one of the rarest second-order weak interaction processes with two major decay modes: two-neutrino ($2\nu$) and neutrinoless ($0\nu$). Mayer [1] first introduced the $2\nu\beta\beta$ decay process as a nuclear disintegration with the simultaneous emission of two electrons and two antineutrinos. This process is allowed by lepton number conservation. The study...
