The nuclear rainbow, observed in the elastic α-nucleus and light heavy-ion (HI) scattering at medium energies, is proven to be due to the refraction of the incident wave by the attractive nucleus-nucleus optical potential. The rainbow pattern is usually associated with a broad oscillation of the Airy minima in elastic scattering cross section, as a result of an interference of the refracted...
We study multistrange Ca, Sn and Pb hypernuclei with $\Lambda\Lambda$ pairing correlations by using the multidimensionally-constraint relativistic Hartree-Bogoliubov (MDC-RHB) model. The axial deformation is allowed and the $\Lambda\Lambda\omega$-tensor coupling is included to reproduce the small spin-orbit splittings for $\Lambda$ hyperon. The separable pairing force of finite-range form is...
By involving the constraints of the slope of nuclear symmetry energy L into the question of determination of the high-density symmetry energy, one needs to probe the curvature of nuclear symmetry energy $K_{sym}$. Based on the Isospin-dependent Boltzmann-Uehling-Uhlenbeck (IBUU) transport model, effects of the curvature of nuclear symmetry energy on the squeezed-out nucleons are demonstrated...
To reach heavy neutron rich nuclei region and superheavy stability island, multinucleon transfer reaction is the most possible way, which has been investigated within dinuclear system model. The calculated transfer cross sections can reproduce the experimental data nicely. The transfer dynamics in the reaction of $^{124,132}$ Sn+$^{238}$ U/$^{248}$ Cm near Coulomb barrier energies is...
nuclear fission is a large amplitude collective motion. It is particularly important in the areas of energy production and nuclear waste disposal. Microsopic study of fission phenomenon is a truly predictive theory. We use the TDHF method to study the fission process after the fission barrier. we compare the fission process and fission fragment disturbution at different inital deformation...
The ($p,n$) reaction at intermediate energies (about 200MeV) is a very effective tool to investigate spin-isospin excitations in nuclei. Gamow-Teller (GT) states is one of the most basic spin-isospin excitations. GT states are changed spin and isospin of the nuclei by one unit without being changed the orbital angular momentum from the initial quantum state. Fermi states are also one of the...
Nuclear mass plays an essential role in the understanding of the r-process which is responsible for the synthesis of about one-half of elements heavier than iron up to bismuth and all of thorium and uranium. The nuclei around the doubly magic numbers N=50, N=82 and N=126 are believed to be waiting points were matter accumulate and therefore form the major peaks in the r-process abundance....
The particle production and their ratios for $\pi$, k, p are studied in different collisions system at different centre of mass energy based on a blast-wave model with thermal equilibrium mechanism.
The transverse momentum spectra of the above-mentioned particles at the kinetic freeze-out stage are also discussed.
The kinematics freeze-out properties were fitted by the blast wave model. For...
We study the properties of hot beta-stable nuclear matter using equations of state derived within the Brueckner-Hartree-Fock approach at finite temperature including consistent three-body forces. Simple and accurate parametrizations of the finite-temperature equations of state are provided. The properties of hot neutron stars are then investigated within this framework, in particular the...
Chemical properties of trans-uranium and super-heavy elements, i.e., electronic properties in their isolated atomic form, are interesting objects of research as well as the nuclear properties. The ionization energy of lawrencium ($ Z = 103 $) was recently measured to be $ 4.96 \, \mathrm{eV} $ at the tandem accelerator at the Japan Atomic Energy Agency (JAEA) [1]. This result and the...
We discuss the electron screening effects on the nuclear burning stages of stars. There is a dense electron cloud in the environment of fully ionized stellar plasma. The nucleus, which has a positive charge, streams in the electron cloud. This nucleus seems to have smaller charge than the original one. This phenomenon is called the electron screening effect. In this situation, the reaction...
A multiphase transport model (AMPT) is successful in describing the experimental data, mainly from heavy ion collisions at the BNL Relativistic Heavy Ion Collider. By using this AMPT model,
the initial geometry effect on collective flows, which are inherited from initial projectile structure, is studied in 4He+12C system. Elliptic flow (v2) and triangular flow (v3) which are significantly...
Collective reaction paths for fusion reactions are microscopically determined on the basis of the adiabatic self-consistent collective coordinate (ASCC) method. This path is maximally decoupled from other intrinsic degrees of freedom. The reaction paths turn out to deviate from those obtained with standard mean-field calculations with constraints on quadrupole and octupole moments. The...
In this talk, we will discuss two new parameter sets for the energy density functional such as G3 and IOPB-I for finite nuclei, and infinite nuclear matter system within the effective field theory motivated relativistic mean-field (ERMF) formalism. The isovector part of the ERMF model employed in the present study includes the coupling of nucleons to the δ and ρ mesons and the cross-coupling...
The Density functional theory (DFT) is a microscopic method to get the ground-state energy of quantum many-body systems.
Due to the low numerical cost, it is widely applicable to nuclear, atomic and molecule physics.
In the DFT, the Hohenberg-Kohn theorem ensures that energy can be expressed as a functional of density, so-called “energy density functional (EDF)” and the EDF is uniquely...
Recent cluster-model calculation predict that $\alpha$ condensed states emerge in self-conjugate $N=4n$ nuclei. In the $\alpha$ condensed states, all of the $\alpha$ clusters are condensed in the lowest orbit, and their matter density is as low as 1/4--1/5 of normal nuclear states. Therefore, observation of the $\alpha$ condensed states is very important for clarifying physical properties of...
This research presents the calculated results of the thermal neutron inelastic scattering cross sections of Bismuth and Sapphire crystals. In this calculations, the effects of thermal neutron scattering on crystal’s phonon vibration and lattice parameters were taken into account by using the NJOY code. This calculated results were updated into the related ACE format data file for MCNP...
Laser wakefield acceleration is a novel concept for particle acceleration which can provide for a significant reduction of the accelerator length compared to conventional accelerators. The main issue in this field is a lack of control over the injection of electrons into the wakefield, resulting in a large spread in energy of the accelerated electron bunches. For producing this particular...
New and next generation RIB facilities provide new insight into the nuclear structure and reaction dynamics of exotic nuclei. However, many of the most interesting species are always produced with very low intensities. Active target Time Projection Chamber (AT-TPC) is one powerful device with several significant features, including 4π acceptance of the reaction products, full detection...
Experimental studies on single-event effects of static random access memories (SRAMs) with different feature sizes were carried out at 100 MeV cyclotron proton accelerator of China Institute of Atomic Energy. Single-event upset (SEU) cross-section curves with different proton energies and different incident angles were obtained for three SRAMs. The effects of incident proton energies and...
The generalized parton distributions(GPDs) is constructed in the high limit of the virtuality. The leading twist is only considered to make the process factorizable. In this presentation the higher twist order, cat’s ears contribution, is included to confirm the correction in the low virtuality. To solve the integration with complicated singularities and to avoid the regularization problem, we...
The black hole accretion disks contain highly ionized Fe, including C$_{IV}$, N$_V$, and O$_{VI}$ at a temperature of about $10^8$K. The relatively hot accretion disk ($10^8$K) and the relatively cool surrounding medium ($10^6$K) are mixed and the iron is ionized and recombined to release the X-ray. This paper investigate the physical properties of turbulent mixing layers and the production of...
CT image ring artifacts are caused by the unsatisfactory response of detector pixels, which degrades the reconstructed image and affects the subsequent processing and quantitative analysis of the image. A novel algorithm based on deep learning is proposed to correct CT ring artifacts. The proposed correction procedure includes the following steps: (1) transfrom the training reconstructed...
Proton charge radius puzzle is a big problem that the size of protons measured by electron scattering and hydrogen spectroscopy is different from the size of protons measured by μ hydrogen spectroscopy. To solve this problem, we are going to perform proton charge radius measurement by electron-proton elastic scattering using a low energy electron linear accelerator at ELPH, Tohoku University....
We will present our recent study of tetraneutron(4n) by using the 8He(p,2p) reaction with inverse kinematics, which was performed at RIKEN RIBF facility in 2017.
Many-neutron systems, in particular the tetraneutron, have attracted lots of attention in the last decades. Their existence of itself, whether as bound or resonate state, is of fundamental importance in nuclear physics, serving as a...
A (p,n) reaction experiment on two N=Z nuclei, Cr-48, was performed in RIBF. In this study, we used inverse kinematics with 190MeV/u Cr-48 beam. We would like to make missing mass spectra using time of flight of neutrons. As neutrons are quite easy to pass through materials and heavy particles carrying up to 190MeV/u don’t loss much energy in liquid hydrogen, a 6mm-thick liquid hydrogen target...
The Rare RI-ring is a newly constructed mass storage ring at RIKEN, built with the purpose of measuring the mass' of exotic nuclei, such as those produced during the r-process. In order to develop the rings mass measuring capabilities, in ring beam diagnostics is required. For this purpose, a large area, non-isochronous, position sensitive detector with low energy loss is being developed to...
Equation of States for Neutron Stars Constructed by Machine Learning from GW170817
In a nuclear physics study using high intensity RI beam, high resolution position and timing detector is required for particle discrimination. We are developing Parallel Plate Avalanche
Counter directory and independently reading out signals from strip electrodes, Strip Readout PPAC(SR-PPAC). It has no delay and high position resolution corresponding to strip size and charge resolution, and it...
The gamma-ray detector array composed of 24 LaBr3(Ce) scintillators is now in preparation for the decay spectroscopy with the fast-timing gamma-ray measurements by the Center for Extreme Nuclear Matters (CENuM) in Korea. Accordingly, the simulation based on the Geant4 framework has been performed for various purposes.
The encapsulated LaBr3(Ce) crystal with a size of 1.5-inch diameter was...
In nuclear physics, the precise measurement on the lifetime of the quantum state is essential to understand the many-body quantum system. Specifically, the lifetime information of first 2+ level in even-Z even-N nucleus provides crucial information on the nuclear structure. As the rare-isotope beams could be produced, the nuclear shell or shape evolution toward the drip-line has become...
Theoretical calculation indicates the existence of molecule configuration in 16C. Linear-chain configuration is a current research hotspot of various molecule configurations. The excited states of 16C with π2σ2 configuration for the four valence neutrons is one of the most promising candidates for the linear-chain structure. The linear-chain configuration generates a rotational band built on...
A real-time testing system consisting of a large-area array of 72 QDR II+ SRAMs (larger than 10-Gbit manufactured in 65 nm CMOS technology) was developed and assembled on the Tibetan Plateau at an altitude of 4,300 m. A new topological structure with 9 QDR II+ devices operating synchronously by a single FPGA was proposed and the signal integrity of the large-area high-speed QDR II+ SRAMs was...
An upgraded Isochronous Mass Spectrometry (IMS) with two new Time-of-Flight
(ToF) detectors has been established in the experimental cooler storage ring (CSRe) in
Institute of Modern Physics in Lanzhou. The double-ToF IMS can measure the velocity
of an ion stored in CSRe. Some preliminary results of the projectile fragments of $^{58}Ni^{19+}$
experiment conducted at the double-ToF IMS are...
Large Acceptance Multi-Purpose Spectrometer (LAMPS) experiment aims to measure the nuclear symmetry energy for rare isotopes with a wide range of N-Z at Rare isotope Accelerator Complex for ON-line experiment (RAON) in Korea. Neutrons have no net charge so that they cannot be detected by a device using electromagnetic force. The neutron detector for LAMPS is made of 4 layers of scintillators...
Francium (Fr) is expected to be a powerful probe for measuring the electron electric dipole moment (eEDM) in high precision, due to its large EDM enhancement factor. We have developed a surface ionizer to produce a high-intensity Fr ion beam at RIKEN. Due to spatial constraints of the experimental area, the yielded ions must be extracted from the ion source at an angle of 45 degrees with...
Recent developments in nuclear potentials based on chiral effective field theory and in various ab-initio approaches have enlarged our microscopic understandings to a wide range of nuclear chart including doubly open-shell nuclei.
However, is it enough to consider only those bottom-up approaches for making reliable predictions about exotic nuclei for which experimental verification is...
There are two types of atomic nuclei: "stable nuclei" and "unstable nuclei". The unstable nuclei make up about 97\% of all nuclides, including those expected to theoretically exist. It has become clear that many of their characteristics such as shape and structure cannot be explained by the standard nuclear structure models. So far, the internal structure of the atomic nuclei have been...
$\alpha$ clustering is a well-known phenomenon in light nuclei where two neutrons and two protons strongly correlate to constitute an $\alpha$ particle as a building block of atomic nuclei. A linear alignment of the $\alpha$ clusters, referred to as linear-chain cluster state (LCCS), has been of great interest since 1950s but until now there is no clear experimental evidence demonstrating the...
