The purpose of this note is threefold: (i) to recall (with some points made more explicit) the mathematical Weyl algebra model formulation, given before, of the Staruszkiewicz theory of quantum Coulomb field; (ii) to add some new elements to the discussion of the representation of the Lorentz group within this model; (iii) to comment on some statements on the structure of the theory which appeared recently.

Suitability of the O-16(B-10; Be-9)F-17 reaction near the Coulomb barrier energy for extraction of the ANC values and indirect determination of the astrophysical S -factor for proton radiative capture by O-16 nucleus is studied. New experimental data on this reaction to the ground (5/2(+)) and excited (1/2(+), E* = 0:495 MeV) states of F-17 at the B-10 beam energy of 41.3 MeV from the U-200P cyclotron (HIL, University of Warsaw) are presented. The ANC squared values 1.03 +/- 0.13 fm and 5430 +/- 950 fm(-1) for the ground and first excited states of the F-17 nucleus, respectively, were obtained using the modified DWBA analysis. The value S(0) = 9.0 +/- 1.5 keVb was found for the O-16(p, gamma)F-17 reaction using the ANC values.

The total neutron cross sections for nitrogen, oxygen, aluminum, and silicon of natural isotopic composition were measured at the energy of E-n = 14.1 MeV. The measurements are the continuation of the previous study using a new simple method based on the NG-150 neutron generator of the INP AS, Uzbekistan. The obtained values are in good agreement with the literature data at the nearby energies. These and the published experimental sigma(tot), as well as the available data on the elastic neutron scattering, were used to specify the parameters of the phenomenological optical n+A potentials, which are now in demand for calculations of cross sections of nuclear-astrophysical processes involving light nuclei.

To measure the total neutron cross sections, the authors developed a convenient technique using silicon semiconductor detectors with the simple and compact detecting system. The created technique was used to measure A + n total cross sections at the energy E n = 14.1 MeV for several nuclei in different mass region. The neutron generator NG-150 in D + T regime of neutrons generation is used as fast neutrons source. The results of measurements and their comparison with the appropriate literature values are also presented.

To measure the total neutron cross sections, the authors developed a convenient technique using silicon semiconductor detectors with the simple and compact detecting system. The created technique was used to measure A + n total cross sections at the energy En = 14.1 MeV for several nuclei in different mass region. The neutron generator NG-150 in D + T regime of neutrons generation is used as fast neutrons source. The results of measurements and their comparison with the appropriate literature values are also presented.

The original version of the activation method is presented and yield of the astrophysical relevant reaction [Formula: see text] has been measured at the energy region 190–650[Formula: see text]keV using this method. The rate of this reaction was calculated within the temperature region [Formula: see text] through the yield values. The possibility of improving the method for measuring very small yields or cross sections was demonstrated.

An automated measuring system capable of determining decay constants and activities of radionuclides in a sample is described. The technique used in it is aimed at identifying radionuclides produced in a sample under fast-neutron irradiation. The advantage of this technique is the procedure for measuring the time dependence of the activity decay after the end of irradiation, which provides a means for acquiring the maximum statistics at a fixed detection efficiency by minimizing pauses between measurements. The developed technique has been tested by calibrating the monitor of neutron fluxes from the HΓ-150 neutron generator. A copper foil with a high chemical purity and a natural isotopic composition has been used as a test sample (an activation detector).

A review is presented of “nontraditional” laboratory nuclear-physical methods for determining key parameters of charged-particle semiconductor detectors, such as the sensitive depth and the energy resolution. The methods for measuring the sensitive depth are based on the peculiarities in interactions of radiation from standard α,β, and γ sources and monochromatic neutrons with the detector materials and require that several “reference” detectors with known characteristics be available. Using the proposed methods, it is possible to preliminarily estimate the serviceability of detectors before employing them in expensive experiments, e.g., on accelerator beams.

Angular distributions of differential cross sections have been measured for elastic, inelastic scattering and the (He3,d) reaction on 6Li nuclei at the Elab(He3)=34MeV energy. The new and early obtained elastic scattering data at 34, 50, 60 and 72 MeV have been analyzed with Coupled Reaction Channels Method (CRC) taking into account triton transfer mechanism. The spectroscopic factors for t+He3 configuration of 6Li were extracted. Parameters for real part of potential have been also calculated microscopically with double folding model. The differential cross sections for proton stripping to the 7Be ground and first excited states have been analyzed by modified DWBA and CRC methods at 34 MeV. The effect of triton and α exchange on proton transfer reaction Li6(He3,d)Be7 for both ground and excited state is discussed. Spectroscopic factors and asymptotical normalization coefficients for p+Li6 configuration of 7Be have been obtained from the experimental data.

Представлен обзор “нетрадиционных” лабораторных ядерно-физических методов определения таких основных параметров полупроводниковых детекторов заряженных частиц, как толщина чувствительного слоя и энергетическое разрешение. Методы измерения толщины чувствительного слоя основаны на особенностях взаимодействия излучения стандартных -, -, -источников и монохроматических нейтронов с материалом детекторов и предполагают наличие нескольких “реперных” детекторов с известными характеристиками. Применение предлагаемых методов позволяет предварительно оценить работоспособность детекторов перед их использованием в дорогостоящих экспериментах, например, на пучках ускорителей.

Angular distributions of differential cross sections have been measured for elastic, inelastic scattering and the (He3,d) reaction on 6Li nuclei at the Elab(He3)=34MeV energy. The new and early obtained elastic scattering data at 34, 50, 60 and 72 MeV have been analyzed with Coupled Reaction Channels Method (CRC) taking into account triton transfer mechanism. The spectroscopic factors for t+He3 configuration of 6Li were extracted. Parameters for real part of potential have been also calculated microscopically with double folding model. The differential cross sections for proton stripping to the 7Be ground and first excited states have been analyzed by modified DWBA and CRC methods at 34 MeV. The effect of triton and α exchange on proton transfer reaction Li6(He3,d)Be7 for both ground and excited state is discussed. Spectroscopic factors and asymptotical normalization coefficients for p+Li6 configuration of 7Be have been obtained from the experimental data.

The differential cross sections of the 10 B(d,t) 9 B and 10 B(d, 3 He) 9 Be reactions at E d = 25 MeV were measured to obtain the ratio of asymptotic normalization coefficients for the bound states of the last neutron and the last proton in the symmetric nucleus 10 B. The obtained ratio is shown to be in agreement with the theoretical value.

It is shown that the energy resolution of silicon detectors, estimated from α-ray spectra irradiated by a reference α source (i.e., the surface resolution), is not always an indicator of detector quality. The energy resolution found from the spectra of particles that penetrate deeply into the detector material (i.e., the depth resolution) can be quite inferior to the surface resolution. It is proposed that detectors be tested in a quasimochromatic neutron flux.

The contribution of the direct radiative capture of protons by 10 B and 24 Mg nuclei at low energies to the astrophysical S -factors in the reactions 10 B (p,γ)11 C and 24 Mg (p,γ)25 Al have been calculated within the R-matrix formalism by using empirical proton asymptotical normalization coefficients (ANC). The ANCs for bound proton configurations {10 B +p} and {24 Mg +p} were obtained from the analysis of the reactions (3 He , d). The ANCs were also estimated from the values of the neutron ANCs in the mirror nucleus 25 Mg following the suggestion that the neutron and the proton in the mirror states have equivalent nuclear potentials. It has been found that the S -factor for the reaction 10 B (p,γ)11 C extrapolated to zero energy contributes ~100 keV b to the radiative capture to the ground state of 11 C . For the reaction 24 Mg (p,γ)25 Al the value S(0) gives 58 keV b with a direct capture contribution of 41 keV b .

A method for determining the thickness of silicon charge particle detectors has been developed. The method is based on measurements of spectra from a standard 137 Cs γ source, whose shape changes with detector thickness. The method can be used in the thickness range ∼50–6000 μm with an accuracy from 20 to 10%, respectively. No complex equipment or laborious calculations are needed.

A computerized measuring system that includes an IBM PC AT and CAMAC-standard electronic equipment is described. The system makes it possible to measure angular dependences of differential cross sections of nuclear reactions for particles with escape angles in a wide range from 2 degrees to 178 degrees with an experimental error within 7%.