Reaction rate of n12C radiative capture at temperature from 0.01 to 10 T9

Within the framework of a modified potential cluster model with forbidden states, radiation n12C capture at energies from 10-5 keV to 5 MeV is considered, taking into account a wide resonance at Ex = 8.2 MeV. It is shown that on the basis of potentials that are consistent with the energies of the bound states, it is possible to correctly transfer the available experimental data. Based on the obtained total cross sections, the n12C capture reaction rate was calculated. The results for reaction rate are approximated by simple expressions, which simplifies their use in applied research.

Reaction rate of p14N →15Oγ capture to all bound states in potential cluster model

Review of calculation results for astrophysical [Formula: see text]-factor of the [Formula: see text]N[Formula: see text]O capture reaction in the [Formula: see text]N channel of [Formula: see text]O was presented. It was carried out in the frame of the modified potential cluster model (MPCM) taking into account resonances in the [Formula: see text]O spectrum up to 3.2[Formula: see text]MeV at energy of incident protons varying of 30[Formula: see text]keV to 5[Formula: see text]MeV. It is possible to describe experimental data for the astrophysical [Formula: see text]-factors of the radiative proton capture on [Formula: see text]N to five excited states of [Formula: see text]O at excitation energies of 5.18[Formula: see text]MeV to 6.86[Formula: see text]MeV, only under assumption, that all five resonances are [Formula: see text] scattering waves. Quality new physical interpretation of the capture mechanism is discussed in this channel to the ground state of [Formula: see text]O. We assumed that the ground state of [Formula: see text]O is determined by the [Formula: see text]N[Formula: see text] channel with excited [Formula: see text]N[Formula: see text] cluster, which immediately allowed us to correctly describe order of values of the experimental [Formula: see text]-factor for capture to this state. Taking into account these results, the total [Formula: see text]-factor of the proton capture on [Formula: see text]N and the reaction rates to the ground and five excited states of [Formula: see text]O were determined at temperatures of 0.01[Formula: see text][Formula: see text] to 10[Formula: see text][Formula: see text]. The parametrization of the total reaction rate with a simple form is performed, which allows as to obtain [Formula: see text] equal to 0.06 with 5% errors of the calculated rate.

Astrophysical S-factor of the radiative proton capture on 14C at low energies

The phase shift analysis for position location of the [Formula: see text] resonance at 1.5 MeV was carried out on the basis of the known experimental measurements of the excitation functions of the p14 C elastic scattering at four angles from 90° to 165° and more than 100 energy values in the range from 600–800 keV to 2200–2400 keV. Also, the possibility to describe the available experimental data on the astrophysical S-factor for the proton capture reaction on 14 C to the ground state (GS) of 15 N at astrophysical energies was considered in the frame of modified potential cluster model (MPCM).

Radiative n11B capture accounting 21 and 430 keV resonances

In the framework of the modified potential cluster model (PCM), the possibility of describing the available experimental data for the total cross-sections for n11 B radiative capture at thermal and astrophysical energies were considered with taking into account the 21 keV and 430 keV resonances.