A systematic study on α-decay half-lives for the nuclei in the range
We propose that fast radio bursts (FRBs) can be used as the probes to constrain the possible anisotropic distribution of baryon matter in the Universe. Monte Carlo simulations show that, 400 (800) FRBs are enough to detect the anisotropy at 95% (99%) confidence level, if the dipole amplitude is at the order of magnitude 0.01. However, much more FRBs are required to tightly constrain the dipole direction. Even 1000 FRBs are far from enough to constrain the dipole direction within angular uncertainty
The flux-weighted average cross sections of natCd(γ, xn)115g,m,111m,109,107,105,104Cd and natCd(γ, x)113g,112,111g,110mAg reactions were measured at the bremsstrahlung end-point energies of 50 and 60 MeV with the activation and off-line γ-ray spectrometric technique using the 100 MeV electron linac at the Pohang Accelerator Laboratory, Korea. The natCd(γ, xn) reaction cross sections as a function of photon energy were theoretically calculated using the TALYS-1.95 and the EMPIRE-3.2 malata codes. Then the flux-weighted average cross sections were obtained from the theoretical values of mono-energetic photons. These values were compared with the flux-weighted values of the present work and are found to be in general agreement. The measured experimental reaction cross-sections and integral yields are described for cadmium and silver isotopes in the natCd(γ, xn)115g,m,111m,109,107,105,104Cd and natCd(γ, x)113g,112,111g,110mAg reactions. The isomeric yield ratio (IR) of 115g,mCd in the natCd(γ, xn) reaction was also determined for above two bremsstrahlung end-point energies. The measured isomeric yield ratios of 115g,mCd in the natCd(γ, xn) reaction were also compared with the theoretical values of the nuclear model codes and the earlier published literature data in the 116Cd(γ,n) and 116Cd(n,2n) reactions. It was found that with the increase of projectile energy IR value increases, which demonstrate the characteristic of excitation energy. However, the higher IR value of 115g,mCd in the 116Cd(n,2n) reaction compared to the 116Cd(γ,n) reaction indicates the role of compound nuclear spin besides excitation energy.
We perform a systematic study on the effect of non-uniform track efficiency correction in higher-order cumulant analysis in heavy-ion collisions. Through analytical derivation, we find that the true values of cumulants can be successfully reproduced by the efficiency correction with an average of the realistic detector efficiency for particles with the same charges within each single phase space. During a toy model simulation by tuning the non-uniformity of the efficiency employed in the track-by-track efficiency correction method, the theoretical conclusions are supported and the valid averaged efficiency is found to suppress the statistical uncertainties of the reproduced cumulants dramatically. Thus, the usage of the averaged efficiency requires a careful study for the phase space dependence. This study is important for carrying out precision measurements of higher-order cumulants in heavy-ion collision experiments at present and in future.
We investigate in detail both transverse momentum and threshold resummation effects on the scalar-pseudoscalar pair production via quark-antiquark annihilation at the
Firstly, a unified fission model is extended to study the two-proton radioactivity of ground states of nuclei, a good agreement between the experimental half-lives and the calculated ones is found. Meanwhile, the two-proton radioactivity half-lives of the ground states of some probable candidates are predicted within this model by inputting the released energies taken from the AME2020 table. It is shown that the predictive accuracy of the half-lives is comparable to that of other models. Then, the two-proton radioactivity of the excited states of 14O, 17,18Ne, 22Mg, 29S and 94Ag is discussed within the unified fission model and two analytical formulas. It is found that the experimental half-lives of the excited states are reproduced better within the unified fission model. Furthermore, the two formulas are not suitable for the study of the two-proton radioactivity of excited states because not only their physical picture deviates from the mechanism of a quantum tunneling but also the parameters involved are obtained without including the experimental data of the excited states.
In this work, we systematically study the two-proton(
A systematic survey of the accurate measurements of heavy-ion fusion cross sections at extreme sub-barrier energies has been carried out by using the coupled-channels (CC) theory that is based on the proximity formalism. The present work theoretically explores the role of surface energy coefficient and energy-dependent nucleus-nucleus proximity potential in mechanism of the fusion hindrance of 14 typical colliding systems with negative
Experimental data sets of nuclear reactions have been systematically collected in hundreds of thousands and are still growing rapidly. The data and their correlations compose a complex system, which underpins nuclear science and technology. We model the nuclear reaction data as weighted evolving networks for the purpose of data verification and validation. The networks are employed to study the growing cross-section data of a neutron induced threshold reaction (n,2n) and photoneutron reaction. In the networks, nodes are the historical data and weights of the links are the relative deviation between the data points. It is found that the networks exhibit the small-world behavior, and their discovery processes are well described by the Heaps law. What makes the networks novel is the mapping relation between the network properties and the salient features of the database: Heaps exponent corresponds to the exploration efficiency of the specific data set, the distribution of the edge-weights corresponds to the global uncertainty of the data set, and the mean node weight corresponds to the uncertainty of the individual data point. This new perspective to understand the database would be helpful for nuclear data analysis and compilation.
We investigate the semi-inclusive production of hidden-charm exotic states, including
The scission point model is improved by considering the excitation-dependent liquid drop model to calculate mass distributions for neutron-induced actinide nuclei fission. Excitation energy effects are influencing the deformations of light fragment and heavy fragment. The improved scission point model shows a significant advance with regard to accuracy for calculating pre-neutron-emission mass distributions of neutron-induced typical actinide fission with incident-neutron-energies up to 99.5 MeV. The theoretical frame assures that the improved scission point model is suitable for evaluating of the fission fragments mass distributions, which will guide for studying the fission physics, designing nuclear fission engineering and nuclear transmutation system.
We calculate the
We apply an equal-velocity quark combination model to study the production of light-flavor hadrons and single-charmed hadrons at midrapidity in
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