ASTROPHYSICAL S-FACTOR $S_{1\,16}$ EVALUATION USING ANCs $^{17}$F→$^{16}$O+p FROM ANALYSIS OF THE $^{16}$O($^{10}$B,$^{9}$Be)$^{17}$F REACTION

25 Sept 2021, 15:40
25m
Oral report Section 2. Experimental and theoretical studies of nuclear reactions. Section 2. Experimental and theoretical studies of nuclear reactions

Speaker

Mr Feruzjon Ergashev (Institute of Nuclear Physics AS UZ)

Description

$\quad$ Knowledge of the asymptotic normalization coefficients (ANC) for the resulting single-particle bound configurations in the final nucleus (or nuclear vertex constants which differ only by a multiplier from ANCs) [1], plays a crucial role in the calculations of direct nuclear-astrophysical processes of radiative capture [2].
$\quad$ Particularly, to extrapolate the astrophysical S factor $S_{1\,16}(E)$ of the $^{16}$O(p,γ)$^{17}$F reaction, which plays an important role in cold CNO cycle of hydrogen burning, it is required to know the corresponding ANCs for $^{16}$O+p→$^{17}$F. These values can be conveniently and reliably extracted from the analysis of nucleon transfer in reactions with heavy ions at near-barrier energies.
$\quad$ The differential cross sections (DCS) of the reaction $^{16}$O($^{10}$B,$^{9}$Be)$^{17}$F measured at $^{10}$B ions beam of the C-200P cyclotron of the Heavy Ion Laboratory (University of Warsaw) with the energy $E_{10B}$=41.3 MeV have been analyzed using the modified DWBA method [3,4]. Domination of the peripheral proton transferring was found to both proton bound states in $^{17}$F nucleus and the ANC for bound $^{17}$F→$^{16}$O+p configurations were extracted for the ground (5/2+) and first excited (E*=0.495 MeV, ½+) states. At that the squared ANC ($C_{^{10}B→^{9}Be+p})^{2}$ [5] was used as the DCS of the reaction should be normalized by the product of the ANCs squares $(C_{^{10}B→^{9}Be+p})^{2}×(C_{^{17}F→^{16}O+p})^{2}$.
$\quad$ Since the reaction 16O(p,γ)17F occurs through the direct radiative capture of protons at energies below $E_p$ = 2.5 MeV (lab), the modified two body potential approach [6] was used to calculate the astrophysical S-factor $S_{1\,16}$. The obtained value of total $S_{1\,16}(0)$ within the margin of error consistent with the value obtained in [7].

[1] L.D. Blokhintsev, I.Borbely, E.I. Dolinskii // Sov. J. Part. Nucl. 8, 485 (1977)
[2] Tribble R.E., et al. // Rep.Prog.Phys.77. –2014. – 106901. – P.1– 49.
[3] S. V. Artemov, et al. // Phys. At. Nucl. 59, 428 (1996).
[4] A. M. Mukhamedzhanov, et al. // Phys. Rev. C 56, 1302 (1997).
[5] R. Yarmukhamedov, K.I. Tursunmakhatov, and N. Burtebayev, Int.J. Mod. Phys.: Conf. Series. 49, 1960016(2019).
[6] S.B. Igamov, R.Yarmukhamedov. Nucl. Phys. A781 (2007) 247.
[7] S.V. Artemov, et al. // Bull. Rus. Academy of Sci.: Physics, 2009, Vol. 73, No. 2, p. 165.

Primary author

Mr Feruzjon Ergashev (Institute of Nuclear Physics AS UZ)

Co-authors

Prof. Sergey Artemov N. Burtebayev (Institute of Nuclear Physics, Almaty, Kazakhstan) Olimjon Tojiboev (Institute of nuclear physics) Mr B. Mauyey (Institute of Nuclear Physics, Almaty, Kazakhstan) Mr Marzhan Nassurlla (Institute of Nuclear Physics, Almaty, Kazakhstan) Mr N. Amangeldi (L.N.Gumilyov Eurasian National University, Nur-Sultan, Kazakhstan) Prof. K. Rusek (Heavy Ion Laboratory, University of Warsaw, Warsaw, Poland) Prof. S.B. Sakuta (National Research Center “Kurchatov Institute”, Moscow, Russia) Mrs A. Trzcińska (Heavy Ion Laboratory, University of Warsaw, Warsaw, Poland) Mrs M. Wolińska-Cichocka (Heavy Ion Laboratory, University of Warsaw, Warsaw, Poland) Prof. E. Piasecki (Heavy Ion Laboratory, University of Warsaw, Warsaw, Poland) Maulen Nassurlla (Institute of Nuclear Physics) A.A. Karakhodzhaev (Institute of Nuclear Physics, Tashkent, Uzbekistan) S.B. Igamov (Institute of Nuclear Physics, Tashkent, Uzbekistan)

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