A new version of Chinese Evaluated Nuclear Data Library, namely CENDL-3.2, has been completed under the joint efforts CENDL working group. This library is constructed with general purpose to provide high-quality nuclear data for modern science and engineering. 272 nuclides from light heavy are covered in CENDL-3.2 total 134 or updated evaluations energy region 10 -5 eV-20 MeV. The most key application like U, Pu, Th, Fe et al. have revised improved, various evaluation techniques developed...

The pion production mechanism is explored based on the ultrarelativistic quantum molecular dynamics model (UrQMD) in which $\mathrm{\ensuremath{\Delta}}$-mass dependence of $\mathcal{M}$ matrix and momentum ${p}_{N\mathrm{\ensuremath{\Delta}}}$ $N\mathrm{\ensuremath{\Delta}}\ensuremath{\rightarrow}NN$ cross sections are taken into account. By analyzing time evolution rate density overlapped region for reaction Au+Au at beam energy $0.4A$ GeV, we find that characteristic observable 1--2 times...

The three-dimensional Langevin model plus a constraint on the heavy fragment deformation is used to study fission dynamics for uranium and plutonium isotopes at low excitation energies. potential energy surface calculated with macroscopic-microscopic based two-center shell model. Werner-Wheeler approximation calculate inertia tensor wall-and-window applied friction tensor. In this work, influence of parameters mass distribution investigated. distributions $^{234,236,239}\mathrm{U}$...

The Langevin approach is extendedly applied to study the dynamical process of nuclear fission within Fourier shape parametrization, where potential energy calculated with macroscopic-microscopic model based on Lublin-Strasbourg drop and Yukawa-folded potential. fragment mass distribution total kinetic as a function heavy in 14 MeV $n+^{235}\mathrm{U}$ are compared evaluated data from ENDF/B-VIII.0 experimental data. It found that Wall for friction tensor available describe both (TKE) present...

We propose a new, rapidly convergent shape parametrization, the so-called Fourier-over-spheroid (FoS) approach, to model fission of heavy nuclei. Four collective coordinates are used characterize fissioning system: its elongation, left-right asymmetry, neck size, and nonaxiality. The potential energy landscape is computed within macroscopic-microscopic on top which multidimensional Langevin equation solved describe dynamics. Charge equilibration at scission deexcitation primary fragments...

The influence of the spin cut-off parameter on isomeric cross-section ratio $(n,2n)$ reaction is studied within Huizenga-Vandenbosch method, in which neutron transmission coefficient evaluated from optical model, and treated for residual nucleus following first emission $({\ensuremath{\sigma}}_{1})$ that second $({\ensuremath{\sigma}}_{2})$ separately. It found definitely sensitive to parameters, especially ${\ensuremath{\sigma}}_{2}$. Moreover, various formulas parameters are compared...

Structural optimization of Lennard-Jones (LJ) clusters is a classical NP problem. There are many local minima locating near the global minimum, and optima number increased exponentially. Social cognitive algorithm (SCOA) new swarm intelligent technique by simulating human society. However, its search capability still weak. Therefore, in this paper, novel strategy, Limited memory Broyden-Fletcher-Goldfarb-Shanno (LBFGS) employed to enhance exploitation SCOA. Simulation results show proposed...

An effective Fourier nuclear shape parametrization, which describes well the most relevant degrees of freedom on way to fission is used construct a three-dimensional collective model. The potential energy surface evaluated within macroscopic-microscopic approach based Lublin-Strasbourg drop macroscopic and Yukawa-folded single-particle potential. A phenomenological inertia parameter describe kinetic properties fissioning system. fragment mass yields are obtained by using an approximate...

Potential energy surfaces and fission barriers of superheavy nuclei are analyzed in the macroscopic-microscopic model. The Lublin-Strasbourg Drop (LSD) is used to obtain macroscopic part energy, whereas shell pairing corrections evaluated using Yukawa-folded potential. A standard flooding technique has been determine barrier heights. It was shown Fourier shape parametrization containing only three deformation parameters reproduces well nuclear shapes on their way fission. In addition,...

The asymmetric fission dynamics of $^{180}\mathrm{Hg}$ has been analyzed in the framework time-dependent generator coordinate method (TDGCM) based on covariant density functional theory (CDFT) with relativistic PC-PK1 functional. Three-dimensional $({\ensuremath{\beta}}_{2},{\ensuremath{\beta}}_{3},{q}_{N})$ constrained CDFT calculations have performed to determine scission configurations. Remarkably, an valley is observed potential energy surface...

The issue of the existence reflection asymmetry in $^{145}\mathrm{Ba}$ has stood for past 30 years without a common conclusion. recent experimental data show number low-lying rotational bands with alternative parities, providing more strict constraints on relevant modeling. With proper octupole deformation, all observed six have been well reproduced by asymmetric shell model (RASM). three deformed neutron single-particle orbitals just above gap 88, $K=1/2,K=3/2$, and $K=5/2$, respectively,...

Abstract Fission properties of the actinide nuclei are deduced from theoretical analysis. We investigate potential energy surfaces and fission barriers predict fragment mass yields isotopes. The results compared with experimental data where available. calculations were performed in macroscopic-microscopic approximation Lublin-Strasbourg Drop (LSD) for macroscopic part, microscopic corrections evaluated Yukawa-folded potential. Fourier nuclear shape parametrization is used to describe shape,...

The impact of nuclear dissipation on the dynamics fission at low excitation energy is studied with a three-dimensional Langevin approach in which two-center shell model adopted to describe shape and single-particle potential. With three types formulas for friction tensor, such as wall formula, wall-and-window formula without term related mass asymmetry change, fragment total kinetic (TKE) distributions low-energy are calculated. calculated almost identical both results consistent evaluated...

In recent years, marine ranching, as an emerging model of industry development, has become a research hotspot in the industries many countries. A ranching is ecological aquaculture fishing ground formed within specific sea area to increase and restore fishery resources, combined with artificial nurseries construction fish reefs. As major maritime country, China attaches great importance supports them important means conserving aquatic providing fishermen jobs, building civilization....

The effects of the pairing force on fission process including static and dynamics aspects are systematically studied, taking induced $^{240}\mathrm{Pu}$ as an example. Skyrme density functional theory (DFT) is adopted to calculate potential energy surface (PES), nucleon localization function, etc. with Hartree-Fock-Bogoliubov (HFB) HFB--Lipkin-Nogami (HFBLN) methods for part. studied based time-dependent generator coordinate method (TDGCM). sensitivity calculation results investigated by...

The role of pairing interactions on the scission configurations, total kinetic energy, and mass distributions in U isotopes is investigated using deformed mean-field plus standard model. energy $^{232--238}\mathrm{U}$ obtained shape-dependent probability distribution expressed by Wigner function reproduces experimental data remarkably well. model calculations show that region sensitive to variation interaction strength, particularly for asymmetric symmetric points. apparent changes...

The role of pairing interactions on fission barriers and static paths in Th, U Pu isotopes is investigated by using the deformed mean-field plus standard model. It found that interaction plays different roles stages process. first second saddle point process are sensitive to strength, while ground-state prescission points mainly driven nuclear deformation. also demonstrated play a crucial region inner outer barriers. barrier heights obtained present model reproduce experimental data...

Abstract We have calculated the potential energy surfaces for 240 Pu up to scission point using density functional theory with different pairing strengths investigate effect of correlations on its fission properties. An enhancement in lowers barrier heights, isomeric state, and ridge between symmetric asymmetric valleys significantly. Moreover, it weakens microscopic shell structure around Fermi surface, shrinks frontiers, especially very regions, lifts total kinetic energies (TKEs) region....

For the n+235U fission reaction, total excitation energy partition of fragments, average neutron kinetic ⟨ε⟩(A) and energies Ēγ(A) removed by γ rays as a function fragment mass are given at incident up to 20 MeV. The prompt multiplicity mass, ν(A), for neutron-induced 235U different is calculated. calculated results checked with multiplicities compared experimental evaluated data. Some emission mechanisms discussed.

Abstract To study the neutron-induced fission of Pu, potential energy surface (PES) calculations were performed using zero and finite-temperature density functional theory (FT-DFT) with Skyrme force. The incident neutron was simulated by temperature FT-DFT. variations least-energy path, barrier, total kinetic energy, scission line, mass distribution fragments analyzed. It learned that an increase in lowers barrier height, isomeric-state ridge between symmetric asymmetric valleys....

Structural optimisation of Lennard-Jones clusters (LJ) is a classical NP-hard problem due to the exponential increased local optima. In this paper, hybrid particle swarm (PSO) designed solve problem. To increase escaping probability from optimum, each maintains two different phase motion: attraction and repulsion in which aims exploitation, while motion tends make exploration capability. further population diversity, one-Gaussian mutation applied best location found by entire swarm. Then,...

The prompt fission neutron spectra for the neutron-induced of 235U at En < 5 MeV are calculated using nuclear evaporation theory with a semi-empirical model, in which nonconstant and constant temperatures related to Fermi gas model taken into account. reproduce experimental data well. For n(thermal)+ reaction, average temperature fragment, probability distribution temperature, discussed compared Los Alamos model. energy carried away by γ rays emitted from each fragment is also obtained...