The neutron capture cross section of ${}^{62}\mathrm{Ni}$ has been measured in the energy range relevant to the astrophysical $s$-process and Maxwellian-averaged cross sections (MACS) were extracted. The experiment was performed with an enriched ${}^{62}\mathrm{Ni}$ sample at a white neutron source using a 160 segment ${\mathrm{BaF}}_2$ detector array. The experimental results: $31.5\pm 2.5_{\mathrm{stat}}\pm 2.2_{\mathrm{sys}}$ mb (MACS at $\mathrm{kT}=25$ keV) and $25.8\pm 1.8_{\mathrm{stat}}\pm 1.9_{\mathrm{sys}}$ mb (MACS at $\mathrm{kT}=30$ keV) resolve a previous discrepancy between recent experiments.

β-decay properties of neutron-rich Ca isotopes have been obtained. Half-life values were determined for the first time for ${}^{54}\mathrm{Ca}$ ($86\pm 7$ ms), ${}^{55}\mathrm{Ca}$ ($22\pm 2$ ms), and ${}^{56}\mathrm{Ca}$ ($11\pm 2$ ms). The half-life of $230\pm 60$ ms deduced for ${}^{53}\mathrm{Ca}$ is significantly longer than reported previously, where the decay chain ${}^{53}\mathrm{K}$ → ${}^{53}\mathrm{Ca}$ → ${}^{53}\mathrm{Sc}$ was considered. A delayed γ ray with an energy of 247 keV was identified following β decay of ${}^{54}\mathrm{Ca}$ and is proposed to depopulate the $1_1^{+}$ level in ${}^{54}\mathrm{Sc}$. The β-decay properties compare favorably with the results of shell-model calculations completed in the full $\mathit{pf}$ space with the GXPF1 interaction. The half-lives of the neutron-rich Ca isotopes are also compared with gross β-decay theory. The systematic trend of the neutron-rich Ca half-lives is consistent with the presence of a subshell gap at $N=32$.

We analyze the evolution of the spin-orbit splittings in the Ca isotopes and in the $N=28$ isotones. We also focus on the reduction of the spin-orbit splittings associated with $f$ and $p$ orbits from ${}^{48}\mathrm{Ca}$ to ${}^{46}\mathrm{Ar}$. We conclude that adding the tensor contribution can qualitatively explain in most cases the empirical trends, whereas this is not the case if one simply employs existing Skyrme parametrizations without the tensor force.

In scattering theory, the squared relative wave function $|\varphi (\mathbf{q},\mathbf{r})|{}^2$ is often interpreted as a weight, due to final-state interactions, describing the probability enhancement for emission with asymptotic relative momentum $q$. An equivalence relation also links the integral of the squared wave function over all coordinate space to the density of states. This relation, which plays an important role in understanding two-particle correlation phenomenology, is altered for the case where the potential is energy dependent, as is assumed in various forms of reaction theory. Here, the modification to the equivalence relation is derived, and it is shown that the squared wave function should be augmented by a additional factor if it is to represent the emission enhancement for final-state interactions. Examples with relativistic vector interactions, e.g., the Coulomb interaction, are presented.

Signatures of isospin effects were investigated for neutron-rich (${}^{124}\mathrm{Sn}+{}^{64}\mathrm{Ni}$) and neutron-poor (${}^{112}\mathrm{Sn}+{}^{58}\mathrm{Ni}$) systems at 35 MeV/nucleon for noncentral collisions. The centrality dependence of these signatures was tested for several impact parameter estimators. Our main observations are (i) the yields of ${}^1\mathrm{H}$ and ${}^3\mathrm{He}$ particles in the neutron-poor system are strongly enhanced with respect to the neutron-rich system, and the yields of ${}^3\mathrm{H}$, ${}^6\mathrm{He}$, and ${}^{7,8}\mathrm{Li}$ are suppressed at all impact parameters, (ii) the yields of ${}^2\mathrm{H}$, ${}^4\mathrm{He}$, and ${}^6\mathrm{Li}$ particles are almost the same for both systems, (iii) the $N/Z$ ratio of intermediate mass fragments is correlated with the neutron richness of the system and is weakly dependent on the centrality of the collision, and (iv) the neutron richness of the detected fragments increases strongly with decreasing rapidity in the range from that of the projectile-like fragment to the c.m. region. The gross features of experimental data are reproduced by quantum molecular dynamics model calculations. A comparison between model calculations and the data indicates that the fragments produced in the c.m. regions are weakly excited.

The near-threshold ϕ-meson production in proton-proton and ${\pi }^{-}p$ collisions is studied with the assumption that the production mechanism is due to the sub-$N\varphi$-threshold $N^{*}(1535)$ resonance. The ${\pi }^0-,\eta -$, and ${\rho }^0$-meson exchanges for proton-proton collisions are considered. It is shown that the contribution to the $\mathit{pp}\to \mathit{pp}\varphi$ reaction from the $t$-channel ${\pi }^0$-meson exchange is dominant. With a significant $N^{*}(1535)N\varphi$ coupling [$g_{N^{*}(1535)N\varphi }^2/4\pi =0.13$], both $\mathit{pp}\to \mathit{pp}\varphi$ and ${\pi }^{-}p\to n\varphi$ data are very well reproduced. The significant coupling of the $N^{*}(1535)$ resonance to $N\varphi$ is compatible with previous indications of a large $s\overline{s}$ component in the quark wave function of the $N^{*}(1535)$ resonance and may be the real origin of the significant enhancement of the ϕ production over the naive OZI-rule predictions.

We study the properties of open-charm mesons ($D$ and $\overline{D}$) in nuclear matter at finite temperature within a self-consistent coupled-channel approach. The meson-baryon interactions are adopted from a type of broken SU(4) $s$-wave Tomozawa-Weinberg term supplemented by an attractive scalar-isoscalar interaction. The in-medium solution at finite temperature incorporates Pauli blocking effects, mean-field binding on all the baryons involved, and π and open-charm meson self-energies in a self-consistent manner. In the $\mathit{DN}$ sector, the ${\Lambda }_c$ and ${\Sigma }_c$ resonances, generated dynamically at 2593 and 2770 MeV in free space, remain close to their free-space position while acquiring a remarkable width due to the thermal smearing of Pauli blocking as well as from the nuclear matter density effects. As a result, the $D$ meson spectral density shows a single pronounced peak for energies close to the $D$ meson free-space mass that broadens with increasing matter density with an extended tail particularly toward lower energies. The $\overline{D}$ potential shows a moderate repulsive behavior coming from the dominant $I=1$ contribution of the $\overline{D}N$ interaction. The low-density theorem is, however, not a good approximation for the $\overline{D}$ self-energy in spite of the absence of resonance-hole contributions close to threshold in this case. We speculate the possibility of $D$-mesic nuclei as well as discuss some consequences for the $J/\Psi$ suppression in heavy-ion collisions, in particular for the future CBM experiment at FAIR.

The exclusive electroproduction process $\overrightarrow{e}p\to e^{\text{'}}n{\pi }^{+}$ was measured in the range of the photon virtuality $Q^2=1.7\text{−}4.5\hspace{1em}{\mathrm{GeV}}^2$, and the invariant mass range for the $n{\pi }^{+}$ system of $W=1.15\text{−}1.7\hspace{1em}\mathrm{GeV}$ using the CEBAF Large Acceptance Spectrometer. For the first time, these kinematics are probed in exclusive ${\pi }^{+}$ production from protons with nearly full coverage in the azimuthal and polar angles of the $n{\pi }^{+}$ center-of-mass system. The $n{\pi }^{+}$ channel has particular sensitivity to the isospin ½ excited nucleon states, and together with the $p{\pi }^0$ final state will serve to determine the transition form factors of a large number of resonances. The largest discrepancy between these results and present modes was seen in the ${\sigma }_{{\mathit{LT}}^{\text{'}}}$ structure function. In this experiment, 31,295 cross section and 4,184 asymmetry data points were measured. Because of the large volume of data, only a reduced set of structure functions and Legendre polynomial moments can be presented that are obtained in model-independent fits to the differential cross sections.

We analyze deep sub-barrier backward quasielastic scattering data for the very massive ${}^{86}\mathrm{Kr}+{}^{208}\mathrm{Pb}$ system, in order to derive the surface diffuseness of the nucleus-nucleus interaction potential in a very massive system, and to compare this value with the ones found in lighter systems. The derived diffuseness value is around 0.70, similar to the ones obtained for lighter quasi-spherical systems.

Radii of sensitivity were estimated for the ${}^6\mathrm{Li}+{}^{58,64}\mathrm{Ni}$ system at energies near the Coulomb barrier. For comparison purposes, such radii were also estimated for stable ${}^{16}\mathrm{O}$ scattered from the same target isotopes. The elastic scattering data were analyzed with folded real potential generated from DDM3Y nucleon-nucleon interaction and an imaginary potential of volume Woods-Saxon form. The most sensitive radii for the ${}^{16}\mathrm{O}+{}^{58,64}\mathrm{Ni}$ system are found to be energy independent and close to the strong absorption radius. For the ${}^6\mathrm{Li}$ projectile, unlike its strongly bound counterpart, the crossing radius increases with decreasing energy. However, no two crossing situation has been observed for either the ${}^6\mathrm{Li}+{}^{58,64}\mathrm{Ni}$ or the ${}^{16}\mathrm{O}+{}^{58,64}\mathrm{Ni}$ system at the top of the barrier.

The collective dipole dynamics evolving in intermediate dinuclear systems with exotic shape and charge distributions formed in charge asymmetric fusion entrance channels are systematically studied by solving a microscopic transport Boltzmann-Nordheim-Vlasov (BNV) equation and analyzing the obtained dipole signal. The BNV analysis shows a typical transition in the dipole oscillation frequency related to a transition from soft-to-hard mode in the dynamical dipole mode. The relative pre-equilibrium γ-ray emission probability is also evaluated by using the classical bremsstrahlung approach. In particular, by using this approach an analytical formula that gives the time-dependent γ rate during the equilibration of the collective mode versus the statistical GDR is extrapolated. The results are in agreement with other models and the few existing experimental data.

To understand baryon stopping we analyze new Relativistic Heavy Ion Collider and Fermilab data within the framework of the multichain Monte Carlo DPMJET-III. The present consideration is restricted to hadron-hadron and $d$-Au collisions, where the present version of the model can be trusted.

We develop the real stabilization method within the framework of the relativistic mean-field (RMF) model. With the self-consistent nuclear potentials from the RMF model, the real stabilization method is used to study single-particle resonant states in spherical nuclei. As examples, the energies, widths, and wave functions of low-lying neutron resonant states in ${}^{120}\mathrm{Sn}$ are obtained. These results are compared with those from the scattering phase-shift method and the analytic continuation in the coupling constant approach and satisfactory agreements are found.

The fast Monte Carlo procedure of hadron generation developed in our previous work is extended to describe noncentral collisions of nuclei. We consider different possibilities to introduce appropriate asymmetry of the freeze-out hypersurface and flow velocity profile. For comparison with other models and experimental data, we demonstrate the results based on the standard parametrizations of the hadron freeze-out hypersurface and flow velocity profile assuming either a common chemical and thermal freeze-out or the chemically frozen evolution from chemical to thermal freeze-out. The ++ generator code is written under the framework and is available for public use at http://uhkm.jinr.ru/.

In this paper, we calculate properties of the spin polarized asymmetrical nuclear matter and neutron star matter, using the lowest order constrained variational (LOCV) method with the ${\mathrm{AV}}_{18}$, Reid93, ${\mathrm{UV}}_{14}$, and ${\mathrm{AV}}_{14}$ potentials. According to our results, the spontaneous phase transition to a ferromagnetic state in the asymmetrical nuclear matter as well as neutron star matter do not occur.

We compare several definitions of the density of a self-bound system, such as a nucleus, in relation with its center-of-mass zero-point motion. A trivial deconvolution relates the internal density to the density defined in the laboratory frame. This result is useful for the practical definition of density functionals.

Experiments have been carried out to explore the reaction dynamics leading to incomplete fusion of heavy ions at moderate excitation energies. Excitation functions for ${}^{168}\mathrm{Lu}$${}^{\mathrm{m}}$, ${}^{167}\mathrm{Lu}$, ${}^{167}\mathrm{Yb}$, ${}^{166}\mathrm{Tm}$, ${}^{179}\mathrm{Re}$, ${}^{177}\mathrm{Re}$, ${}^{177}\mathrm{W}$, ${}^{178}\mathrm{Ta}$, and ${}^{177}\mathrm{Hf}$ radio-nuclides populated via complete and/or incomplete fusion of ${}^{16}\mathrm{O}$ with ${}^{159}\mathrm{Tb}$ and ${}^{169}\mathrm{Tm}$ have been studied over the wide projectile energy range $E_{\mathrm{proj}}\approx 75\text{−}95$ MeV. Recoil-catcher technique followed by off-line γ-spectrometry has been employed in the present measurements. Experimental data have been compared with the predictions of theoretical model code PACE2. The experimentally measured production cross sections of α-emitting channels were found to be larger as compared to the theoretical model predictions and may be attributed to incomplete fusion at these energies. During the analysis of experimental data, incomplete fusion has been found to be competing with complete fusion. As such, an attempt has been made to estimate the incomplete fusion fraction for both the systems, and has been found to be sensitive for projectile energy and mass asymmetry of interacting partners.

The neutron capture cross section of ${}^{14}\mathrm{C}$ is of relevance for several nucleosynthesis scenarios such as inhomogeneous Big Bang models, neutron induced CNO cycles, and neutrino driven wind models for the $r$ process. The ${}^{14}\mathrm{C}$($n,\gamma$) reaction is also important for the validation of the Coulomb dissociation method, where the ($n,\gamma$) cross section can be indirectly obtained via the time-reversed process. So far, the example of ${}^{14}\mathrm{C}$ is the only case with neutrons where both, direct measurement and indirect Coulomb dissociation, have been applied. Unfortunately, the interpretation is obscured by discrepancies between several experiments and theory. Therefore, we report on new direct measurements of the ${}^{14}\mathrm{C}$($n,\gamma$) reaction with neutron energies ranging from 20 to 800 keV.