Photodisintegration of H3

Bösch, R.; Lang, J.; Müller, R.; Wölfli, W.

doi:10.1016/0031-9163(64)90734-6

Cited by 32 publications

(12 citation statements)

References 8 publications

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“…At higher energies, there exist several measurements of the unpolarized differential cross section for both the radiative capture process 2 H(n, γ) 3 H [73] and for the "time-reversed" process 3 H(γ, n) 2 H [82][83][84][85][86]. In the c.m.…”

Section: The 2 H(n γ) 3 H Radiative Capture Reactionmentioning

confidence: 99%

Electromagnetic structure of A=2 and 3 nuclei and the nuclear current operator

et al. 2005

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Different models for conserved two-and three-body electromagnetic currents are constructed from two-and three-nucleon interactions, using either meson-exchange mechanisms or minimal substitution in the momentum dependence of these interactions. The connection between these two different schemes is elucidated. A number of low-energy electronuclear observables, including (i) np radiative capture at thermal neutron energies and deuteron photodisintegration at low energies, (ii) nd and pd radiative capture reactions, and (iii) isoscalar and isovector magnetic form factors of 3 H and 3 He, are calculated in order to make a comparative study of these models for the current operator. The realistic Argonne v18 two-nucleon and Urbana IX or Tucson-Melbourne three-nucleon interactions are taken as a case study. For A=3 processes, the bound and continuum wave functions, both below and above deuteron breakup threshold, are obtained with the correlated hyperspherical-harmonics method. Three-body currents give small but significant contributions to some of the polarization observables in the 2 H(p, γ) 3 He process and the 2 H(n, γ) 3 H cross section at thermal neutron energies. It is shown that the use of a current which did not exactly satisfy current conservation with the two-and three-nucleon interactions in the Hamiltonian was responsible for some of the discrepancies reported in previous studies between the experimental and theoretical polarization observables in pd radiative capture.

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Section: The 2 H(n γ) 3 H Radiative Capture Reactionmentioning

confidence: 99%

Electromagnetic structure of A=2 and 3 nuclei and the nuclear current operator

et al. 2005

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“…Photonuclear reaction cross sections versus γ-ray energy E. The solid curves represent fit (2) with σ 0 , β, γ from Table 2. 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).…”

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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“…The /'s are supposed to carry the associated (real) phases. Since the operator 1 is a scalar in ordinary spin space, there are no cross terms between the doublet states (1, 2,9) and the quartet states (6,7,8 …”

Section: Appendix Bmentioning

confidence: 99%

Muon Capture in Helium-3

Peterson

1968

Phys. Rev.

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The partial capture rate ju~-fHe 3 -> W+v is calculated, including terms through 0(1/M 2 ) and a phenomenological treatment of the exchange effects. The wave function of the three-nucleon system is largely determined by recent analyses of the electromagnetic form factors. The exchange effects are found to be very important: If they are neglected, two sets of values of Fp consistent with experiment are 0±3 and 35db3. Including the exchange effects, 6

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Photodisintegration of H3

Cited by 32 publications

References 8 publications

Electromagnetic structure of A=2 and 3 nuclei and the nuclear current operator

Electromagnetic structure of A=2 and 3 nuclei and the nuclear current operator

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

Muon Capture in Helium-3

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