The equation of states of (EoS) of the spin polarized, asymmetric nuclear matter (NM) is studied within the nonrelativistic Hartree-Fock (HF) formalism using realistic choices for the in-medium (density dependent) nucleon-nucleon (NN) interaction, dubbed as CDM3Y4, CDM3Y5, CDM3Y6 and CDM3Y8. Two scenarios for the density dependence of the spin polarization $\Delta$ of baryons in NM are...
It has been well-known that the pairing correlations decrease with increasing temperature T. However, recent studies have reported a possible increase of pairing correlation in excited (hot) odd nuclei at low temperature (T < 0.5 – 1 MeV), which is associated to the pairing reentrance phenomenon [1, 2]. The latter has been explained due to the blocking effect of odd nucleon in odd nuclei at...
The next new superheavy element(SHE) locates the 8th period, is the notable element that provides the view on the existence of the predicted "island of stability (114-protons, 184-neutrons)" in the superheavy element region. In addition, neutron-rich nucleus far from the valley of stability in the nuclear chart are thought to have been produced by the r-process caused by supernova explosions...
Many-body tunneling is an important phenomenon in many fields of physics and chemistry.
In nuclear physics, tunneling effects appear, e.g., in low-energy fusion reactions, spontanious fission and so on.
The microscopic description of such tunneling effects is one of the major goals of nuclear reaction theory.
The time-dependent Hartree-Fock (TDHF) method, or the time-dependent density...
The nuclei having A ~120 (50 ≤ Z ≤ 56) are of considerable interest because of the competing shape driving tendencies of their orbitals occupied by the neutrons and the protons. Due to presence of both quadrupole and the octupole collectivity in the neutron deficient Ba, Cs and Xe nuclei with mass A ~ 120 have attracted much attention in recent years. For nuclei with A < 120, due to their...
In this research, we tested a new idea to measure proton-distribution radii ($r_{\rm{p}}$) by heavy-ion secondary beam experiments. It is important for understanding the structures of nuclei to know the proton- and the neutron-distribution radii independently. From this point of view, we tried to develop a new method to deduce proton-distribution radii ($r_{\rm{p}}$) very efficiently using...
$^{100}$Sn (N=Z=50) and its neighboring nuclei have drawn great attention due to its possible doubly-magic nature and location around the proton drip-line. Being predicted as the end point of rp-process path, the properties of these nuclei also directly affect the synthesis of heavier elements. We therefore performed in-beam $\gamma$-ray spectroscopy of $^{100}$Sn and the neighboring nuclei...
Understanding the nature of two sequential occurrences of the Gamow-Teller transition is important not only for the nuclear structure but also for the particle physics. However, there is little experimental information about the double Gamow-Teller transition at present. Especially, although the existence of a giant resonance state in double Gamow-Teller transition (Double Gamow-Teller Giant...
Differential cross sections of (p,n) and (3He,t) charge-exchange reactions leading to the excitation of the isobaric analog state (IAS) of the target nucleus are calculated with the distorted wave Born approximation. The G-matrix double-folding method is employed to determine the nucleus-nucleus optical potential within the framework of the Lane model. G matrices are obtained from a...
The decay for number of compound nuclei formed in low energy heavy ion reactions have been successfully studied using dynamical cluster decay model (DCM) [R. K. Gupta, W. Scheid, C. Beck et al., Phys. Rev. C {68} (2003) 014610]. In a previous study the decay of $^{24,25}$${Mg}^*$ compound nuclei (CN) for the experimentally observed intermediate mass fragments (IMFs) that are $^{6,7}$Li and...
The evolution of shell structure with neutron and proton excess is a compelling interest in nuclear physics over the decade. The existence of the single-proton (single-neutron) shifts is well known experimentally in a series of isotopes (isotones) [1]. Although shell gaps, defined within a given theoretical framework as differences of effective single particle energies (ESPE), are not...
In general, the quantum many-body wave function obtained by theoretical calculation contains an enormous amount of information about many-body correlation. However, theoretical analyses in nuclear physics are mainly performed for quantities such as one- and two-body densities, which are obtained after integrating out most of the information in a many-body wave function.
On the other hand,...
Radiation Portal Monitors (RPMs) are highly sensitive fixed installation systems designed to detect illicit radioactive material trafficking. RPMs are typically installed with detectors that have a high detection efficiency, such as plastic detectors. However, due to these detectors' limited energy resolution, radioisotope identification from their spectra is often not of interest. This...
A gas detector with a size of 140×140×140 mm$^3$, named the Compact Active Target Time Projection Chamber (CAT-TPC), has been developed aiming to measure resonant scattering associated with cluster structures in unstable nuclei. The CAT-TPC consists of an electronic field cage, double thick gas-electron-multiplier foils, a general purpose digital data acquisition system, and especially a newly...
The GRAMS (Gamma-Ray and AntiMatter Survey) project that aims to observe MeV gamma rays and to search for dark matter at the same time started in 2021 on full scale. The MeV gamma-ray region is important for understanding phenomena in the universe such as nucleosynthesis and high-energy particle acceleration. The detector for the project is a large LArTPC (Liquid Argon Time Projection Chamber)...
The nuclear matter compressibility ($K_{\tau}$) is an important physical quantity that can directly determine a part of the equation of state of nuclear matter. In order to determine $K_{\tau}$ with high accuracy, it is indispensable to determine the compressibility of many nuclei ($K_{\mathrm{A}}$). We have been developing an active target CAT-M for the purpose of systematic measurement of an...
The existence of the permanent Electric Dipole Moment (EDM) implies the time reversal symmetry violation. This violation directly means CP violation by the CPT theorem, and it would be expected to explain the observed matter-antimatter asymmetry.
The T-violation predicted by the Standard Model (SM) of particle physics for the electron EDM is too small to be measured with current experimental...
