abstract

The feasibility study of an underground laboratory in the Polkowice-Sieroszowice mine in Poland (SUNLAB) as a host of a far detector in a long-baseline neutrino oscillation experiment was performed. The SUNLAB location was previously studied under the LAGUNA FP7 project as a location for the underground multipurpose laboratory. The complementary study of the long-baseline neutrino experiment presented in this paper was performed as a continuation of this idea. A neutrino beam produced at CERN and a far LAr TPC detector hosted in the SUNLAB Laboratory were simulated. The sensitivity of such an experiment for the determination of the CP-symmetry violation in neutrino sector was calculated. The experiment at SUNLAB equipped with the 100 kton LAr TPC detector after 10 years of data taking can give the coverage of \(\delta _{\mathrm {CP}}\) parameter space of 58% (60%) for the normal (inverted) neutrino mass hierarchy at \(3\sigma \) level and in the both cases reaches \(5\sigma \) level in the case of the maximal violation.

abstract

We discuss positronium decays with emphasis on tests of fundamental symmetries and the constraints from measurements of other precision observables involving electrons and photons.

abstract

In this article, we construct the axialvector-diquark–axialvector-antidi-quark type currents to study both the vector and axialvector \(QQ\bar {Q}\bar {Q}\) tetra-quark states with the QCD sum rules, and obtain the masses \(M_{Y(cc\bar {c}\bar {c},1^{+-})} =6.05\pm 0.08\,\rm {GeV}\), \(M_{Y(cc\bar {c}\bar {c},1^{--})} =6.11\pm 0.08\,\rm {GeV}\), \(M_{Y(bb\bar {b}\bar {b},1^{+-})} =18.84\pm 0.09\,\rm {GeV}\), \(M_{Y(bb\bar {b}\bar {b},1^{--})} =18.89\pm 0.09\,\rm {GeV}\). The vector tetraquark states lie \(40\,\rm {MeV}\) above the corresponding centroids of the \(0^{++}\), \(1^{+-}\) and \(2^{++}\) tetraquark states, which is a typical feature of the vector tetraquark states consisting of four heavy quarks.

abstract

Cluster decay half-lives of some cluster emitters were calculated by using microscopic potential in framework of semiclassical WKB method with considering the Bohr–Sommerfeld quantization. The microscopic double-folding potential was used for cluster–daughter nuclear potential. By considering the uncertainty of the radius and surface diffuseness in double folding nuclear potential, the uncertainties of the cluster decay half-lives have been determined. The calculated half-lives with double folding potential were in reasonable agreement with experimental data.

abstract

We present theoretical research on the optimal atomic resonance conditions for long-lived (T\(_{1/2}\) \(\sim \) 6.85 h) \(^{93m}\)Mo isomer depletion via nuclear excitation by electron capture (NEEC) in a beam-based scenario. Analysis of potentially possible NEEC-resonance kinetic energy and predictions of the mean equilibrium charge state for the \(^{93m}\)Mo recoil ion as a function of its kinetic energy in the He, C, Mg, and Al stopping media have been performed. We have found for the solid targets the high probability of observing the NEEC process for electron capture into \(M\) subshells for \(q=+33\) charge state, and also significant probability for electron capture into \(N\) subshells for \(q=+34\). Moreover, we have concluded that, for the studied solid targets, the occurrence of NEEC seems to be more probable than for a He gas target. The results of our study should be an important step toward the controlled release of energy stored in the nuclear isomer of some elements and may also be useful in the development of a new class of nuclear energy sources.

abstract

The question of the termination of a periodic spatial structure of Turing type in a growing system is addressed in a chemical engineering perspective and a biomimetic approach. The effects of the dynamical parameters on the stability and the wavelength of the structure are analytically studied and used to propose experimental conditions for which a Turing pattern stops by itself with a decreasing wavelength. The proposed mechanism is successfully checked by the numerical integration of the equations governing the dynamics of the activator and the inhibitor. We conclude that a local increase of the concentration of the reservoir which controls the injection rate of the inhibitor into the system can be used to achieve the appropriate termination of a Turing pattern.