Astrophysical S-factor for the radiative-capture reaction p 13C → 14Nγ

2012

Annalen der Physik

Abstract. The versions of intercluster interaction potentials describing the resonance nature of some phase shifts of the n 7 Li elastic scattering at low energies and the P 2 ground state of 8 Li in the n 7 Li cluster channel have been constructed. The possibility of describing the total cross sections of 7 Li(n, ) 8 Li within the energies from 5 meV (510 -3 eV) to 1 MeV, including resonance at 0.25 MeV, has been demonstrated for the potentials obtained in the potential cluster model with forbidden states.

Section: Resultsmentioning

confidence: 99%

The ⁷Li (n,γ)⁸Li radiative capture at astrophysical energies

2012

Annalen der Physik

“…The properties of these cluster nuclei, their characteristics and considered cluster channels are given in Table 1. The last results obtained in the framework of the MPCM are given in works [26][27][28][29]31,[56][57][58][59][60][61][62][63][64]. Thus, the MPCM again confirms its ability correctly describe the cross sections of the processes like radiative capture of neutral and charged particles on light nuclei at thermal and astrophysical energies, using for this simple principles of classifications of FSs and ASs in two-cluster systems [19][20][21][22][23][24][25]29,31,46,47].…”

Section: Resultsmentioning

confidence: 99%

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

Burtebaev

et al. 2014

Mod. Phys. Lett. A

The phase shift analysis for position location of the 2 S 1/2 resonance at 1.5 MeV was carried out on the basis of the known experimental measurements of the excitation functions of the p 14 C elastic scattering at four angles from 90 to 165 and more than 100 energy values in the range from 600-800 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 of 15 N at astrophysical energies was considered in the frame of modified potential cluster model. PACS Number(s): 21.60.Gx, 25.20.Lj, 25.40.Lw, 26.20.Np, 26.35.+c, 26.50.+x, 26.90.+n, 98.80

“…In Ref. 27, value 0.066 (25) keV·b was obtained, in Ref. 50 0.070(3) keV·b was found for the S(0)factor.…”

Section: Astrophysical S-factor For Capture To the 2 Nd Esmentioning

confidence: 90%

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

Burkova

et al. 2020

Int. J. Mod. Phys. E

Review of calculation results for astrophysical S-factor of the 14 N(р,  15 О capture reaction in the p 14 N channel of 15 O was presented. It was carried out in the frame of the modified potential cluster model, taking into account resonances in the 15 O spectrum up to 3.2 MeV at energy of incident protons varying from 30 keV to 5 MeV. It is possible to describe experimental data for the astrophysical Sfactors of the radiative proton capture on 14 N to five excited states of 15 O at excitation energies from 5.18 MeV to 6.86 MeV, only under assumption, that all five resonances are D scattering waves. Quality new physical interpretation of the capture mechanism is discussed in this channel to the ground state of 15 O. Carried out by us assumption that the ground state of 15 O is determined by the p 14 N * channel with excited 14 N * cluster, immediately allowed us to correctly describe order of values of the experimental S-factor for capture to this state. Taking into account these results, the total S-factor of the proton capture on 14 N and the reaction rates to the ground and five excited states of 15 O were determined at temperatures from 0.01 to 10 T 9 . The parametrization of the total reaction rate with a simple form is performed, which allows to obtain  2 equal to 0.06 with 5% errors of the calculated rate.1. With an excitation energy of 5.183(1) MeV above BS or -2.1141 MeV in c.m. Ref. 26 relative to threshold of the р 14 N channel, there is a first excited, but bound in this channel, state with the moment J  = 1/2 + , which can be matched to the doublet 2 S 1/2 wave with FS. Although such state can, of course, be considered as a quartet 4 D 1/2 wave with FS.2. The second ES (2 nd ES) with an excitation energy of 5.2409(3) MeV Ref. 26 relative to the GS or -2.0562 MeV relative to the threshold of the р 14 N channel has J  = 5/2 + and it can be matched to the mixture of doublet and quartet 2+4 D 5/2 waves with FS.3. The third excited state (3 rd ES) at an excitation energy of 6.1763(17) MeV Ref. 26 relative to the GS or -1.1208 MeV relative to channel threshold has J  = 3/2and it can be compared to a mixture of doublet and quartet 2+4 Р 3/2 -waves without an associated FS.4. The fourth excited state (4 th ES) has an excitation energy of 6.7931(17) MeV relative to the GS or -0.504 MeV Ref. 26 or relative to the channel threshold has J  = 3/2 + and it can be compared with the quartet 4 S 3/2 wave with the FS. Of course, this state may also be a mixture of doublet and quartet 2+4 D 3/2 waves with the FS.5. The fifth excited state (5 th ES) with an excitation energy of 6.8594(9) MeV Ref. 26 relative to the GS or -0.4377 MeV relative to the channel threshold has J  = 5/2 + and it can also be compared to a mixture of doublet and quartet 2+4 D 5/2 wave with the FS 6. There is another bound state in the р 14 N channel with J  = 7/2 + at an excitation energy of 7.2759(6) MeV Ref. 26 relative to the GS or -0.0212 MeV relative to the threshold of the considered channel, which can be compared to the 4 D 7/2 s...