Study of the 4He (γ, p)3H and 4He(γ, n)3He reactions

Горбунов, А. А.

doi:10.1016/0370-2693(68)90230-x

Cited by 72 publications

(62 citation statements)

References 6 publications

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“…A slightly different method was developed for harmonic pair potential. 15 Both methods were developed for such a cluster, the molecules of which form in a bulk condensed phase a crystal of the same syn-gony as a substrate. Furthermore, in order for these method to be valid, the lattice parameter of the crystal must be approximately the same as the substrate lattice parameter.…”

Section: Introductionmentioning

confidence: 99%

Helmholtz free energy of a cluster on the coherent substrate: Monte Carlo calculations

Zapadinsky

Kulmala

1995

The Journal of Chemical Physics

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Monte Carlo simulations of clusters on underlying substrate have been performed. A cluster free energy has been calculated for different substrate lattice parameters. Computing efforts have been focused on the case when a substrate lattice was approximately the same as a bulk crystal lattice consisting of the cluster molecules. The present calculations qualitatively confirm the dependence of the cluster free energy on a misfit between the lattices found in previous studies ͓D. Turnbull and B. Vonnegut, Ind. Eng. Chem. 44, 1292 ͑1952͒ and N. Cabrera, Mem. Sci. Rev. Metall. 62, 205 ͑1965͔͒. The effect of the misfit turns out to grow when the number of molecules in the cluster increases. The aforementioned studies of Turnbull and Vonnegut, and Cabrera predicted less strong dependence of the effect of the misfit on the number of molecules in the cluster.

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Section: Introductionmentioning

confidence: 99%

Helmholtz free energy of a cluster on the coherent substrate: Monte Carlo calculations

Zapadinsky

Kulmala

1995

The Journal of Chemical Physics

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“…The dots indicate the experimental data: T(γ, n) D Varfolomeev and Gorbunov (1965), Bosch et al (1964), Skopik et al (1981), Faul et al (1981); T(γ, 2n)p Faul et al (1980). 3 He(γ, p) D Ticcioni et al (1973), Stewart et al (1965), Warren et al (1963), Naito et al (2006); 3 He(γ, n)2p Fetisov et al (1965), Ticcioni et al (1973), Faul et al (1981), Naito et al (2006); 4 He(γ, p) T Shima et al (2001T Shima et al ( ,2005, Kusakabe et al (2009), Arkatov et al (1978b, Gorbunov (1968), Balestra et al (1977); 4 He(γ, n) 3 He Irish et al (1975), Balestra et al (1977), Gorbunov (1968), Shima et al (2001Shima et al ( ,2005, Kusakabe et al (2009), Nilson (2005,2007, Arkatov (1978a); 4 He(γ, D) D Arkatov et al (1980); 4 He(γ, pn) D Shima et al (2001D Shima et al ( ,2005, Arkatov et al (1969b), Gorbunov (1958); 4 He(γ, 2p2n) Balestra et al (1977), Arkatov et al (1969a), Gorbunov (1969). spectral parameters can be obtained by solving the system of ordinary differential equations (4 -7):…”

Section: Kinetics Of the Isotopic Composition Of The Interstellar Mediummentioning

confidence: 99%

Influence of gamma-ray emission on the isotopic composition of clouds in the interstellar medium

2012

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We investigate one mechanism of the change in the isotopic composition of cosmologically distant clouds of interstellar gas whose matter was subjected only slightly to star formation processes. According to the standard cosmological model, the isotopic composition of the gas in such clouds was formed at the epoch of Big Bang nucleosynthesis and is determined only by the baryon density in the Universe. The dispersion in the available cloud composition observations exceeds the errors of individual measurements. This may indicate that there are mechanisms of the change in the composition of matter in the Universe after the completion of Big Bang nucleosynthesis. We have calculated the destruction and production rates of light isotopes (D, 3 He, 4 He) under the influence of photonuclear reactions triggered by the gamma-ray emission from active galactic nuclei (AGNs). We investigate the destruction and production of light elements depending on the spectral characteristics of the gamma-ray emission. We show that in comparison with previous works, taking into account the influence of spectral hardness on the photonuclear reaction rates can increase the characteristic radii of influence of the gamma-ray emission from AGNs by a factor of 2-8. The high gamma-ray luminosities of AGNs observed in recent years increase the previous estimates of the characteristic radii by two orders of magnitude. This may suggest that the influence of the emission from AGNs on the change in the composition of the medium in the immediate neighborhood (the host galaxy) has been underestimated.

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“…Because of the manner in which our experiment has been designed, we cannot set very strict limits to any possible structure. The question as to why the deuteron, He 3 [25,26] and He 4 [26,27] photo-disintegration cross-sections do not show dips at 160 MeV, whereas Li and Be do, is an interesting one and high-resolution studies of the former reactions should be carried out. All existing data on these reactions have been obtained in low-resolution experiments.…”

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confidence: 98%