Photodisintegration of Be9

doi:10.1016/0029-5582(65)90333-0

Nuclear Physics

Volume 65, Issue 4, April 1965, Pages 662-672

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Abstract

The spectra of photoprotons and α-particles from the Be⁹(γ, p)Li⁸ and $Be^{9} (γ, n)Be^{8∗} →2α$ reactions are investigated with the aid of nuclear photoplates in a magnetic field. It is shown that the (γ, p) reaction excitation function plotted by the energy spectrum of protons under the assumption that the recoil nucleus Li⁸ is produced in the ground state is in good agreement with the excitation functions measured by the β⁻ activity of the residual nucleus Li⁸. The data on photoprotons agree with the available calculations of the “direct” photoemission of nucleons from the nucleus. It is shown that the intensity of (γ, n) processes with the production of Be⁸ in the second excited state 4⁺ roughly equals the overall intensity of the (γ, n) processes with the production of Be⁸ in states with $E_{Be^{8}}^{∗}$ from 16.08 to 22.06 MeV. A comparatively high ratio of the yield of deuterons to that of protons (Y_d/Y_p = 0.20±0.10 at 3.7≦E_p, E_d≦14.2 MeV) is measured. The cross section for the reactions accompanied by deuteron emission is estimated to account for 6 to 7% of the total cross section for the absorption of γ quanta with energies from 16.7 to 35 MeV.

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Cited by (2)

The role of resonances in the capture of 8Li(p, γ)9Be on the reaction rate of the relevant astrophysical synthesis of 9Be
2020, Nuclear Physics A
Citation Excerpt :
The interval of possible S(0) values defined near the range of 0.63 to 1.15 keV⋅b. However, in all of these works [9,38,39] none of the resonances have been taken into account and the S-factor has a smooth shape. In addition, the results for comparison with experimental measurements [13,14] are not given in those works. The result of this parametrization is shown in Fig. 4 by the light blue dashed curve.
The total cross sections of the radiative proton capture on ⁸Li at astrophysical energies are considered in the framework of the modified potential cluster model with forbidden states with the classification of the orbital cluster states according to Young diagrams. The data obtained from the ⁹Be(γ, $p_{0}$ )⁸Li photodisintegration process according to the detailed balancing principle are used for the experimental data of the ⁸Li(p, γ)⁹Be capture. It is possible to reproduce the available data on cross sections at the energies up to 7.0 MeV. Astrophysical S-factors and reaction rates $〈 σ ν 〉$ are calculated at the temperature range of 0.01 to 10 $T_{9}$ . It is shown that the reaction rate is significantly affected by the resonances in the $p^{8}$ Li scattering channel, and, especially by the first $1 / 2^{-}$ resonance at 87 keV. The analytical parametrization is performed for the calculated reaction rate $〈 σ ν 〉$ .
Role of resonances in the 8Li(p,y)9Be capture on reaction rate of the relevant astrophysical synthesis of 9Be
2019, arXiv

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Nuclear Physics

Abstract

References (24)

Nuclear Physics

Nuclear Physics

Phys. Rev.

Phys. Rev.

Doklady Akad. Nauk SSSR

Zhurn. Techn. Fiz.

Can. J. Phys.

Phys. Rev.

Ames Lab. Research and Development Report IS-191

Phys. Rev.

Phys. Rev.

JETP

Cited by (2)

The role of resonances in the capture of <sup>8</sup>Li(p, γ)<sup>9</sup>Be on the reaction rate of the relevant astrophysical synthesis of <sup>9</sup>Be

Role of resonances in the <sup>8</sup>Li(p,y)<sup>9</sup>Be capture on reaction rate of the relevant astrophysical synthesis of <sup>9</sup>Be