Photonuclear reactions at intermediate energies (40 MeV⩽Eγ⩽400 MeV)

Gari, M.; Hebach, H.

doi:10.1016/0370-1573(81)90008-9

Cited by 119 publications

(31 citation statements)

References 57 publications

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“…The applicability of the theoretically calculated overlap functions has been tested in the description of the 16 O(p, d) pickup reaction [20][21][22] and of the 40 Ca(p, d) reaction (within the JCM) [20]. It has been found a good overall agreement between the calculated and the empirical cross sections.…”

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confidence: 60%

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Overlap functions in correlation methods and quasifree nucleon knockout from16O

et al. 1999

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confidence: 60%

“…The results, however, are very sensitive to the theoretical ingredients adopted for bound and scattering states. On the other hand, various calculations in different theoretical approaches indicate that MEC play a prominent role also in the (γ, p) reaction [26,40].…”

Section: Theoretical Approachmentioning

confidence: 99%

Overlap functions in correlation methods and quasifree nucleon knockout from16O

et al. 1999

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“…This information comes from indirect evaluation of MEC in RPA calculations based on the charge-current continuity equation [49,52,72] and also from their explicit calculation as it is done in Refs. [73][74][75][76].…”

Section: The Electromagnetic Currentsmentioning

confidence: 99%

Short-Range Correlations and Meson Exchange Currents in Photonucleon Emission

et al. 2002

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One-nucleon emission processes induced by photon absorption are studied by considering shortrange correlation effects. At energies above the giant resonance region the validity of the direct knockout model has been tested by comparison with continuum random phase approximation results. Nucleon re-scattering effects have been considered by using an optical potential. The role of the electromagnetic convection, magnetization, and meson exchange currents has been investigated as a function of both excitation energy and momentum transfer. The short-range correlation effects have been studied by using various correlation functions. We found that the nucleon photo-emission cross section is rather sensitive to the presence of short-range correlations at large values of nucleon emission angle. In this region, however, the effects of meson exchange currents are even larger than those produced by short-range correlations. C 2002 Elsevier Science (USA)

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“…The integrals β i and β j→i have been computed numerically for various values of τ x using the cascade spectrum (4.31) and the known cross-sections for photofission processes (see Faul et al 1981, Gari and Hebach 1981, Govaerts et al 1981. As seen in figure 14, β i rises sharply from zero above a critical value of τ x (which increases as the square of the photofission threshold Q i ), peaks at a value which is nearly the same (≈ 1 GeV −1 ) for all light elements, and subsequently falls off rather slowly with increasing τ x .…”

Section: Electromagnetic Showersmentioning

confidence: 99%

Big bang nucleosynthesis and physics beyond the standard model

1996

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Abstract. The Hubble expansion of galaxies, the 2.73 K blackbody radiation background and the cosmic abundances of the light elements argue for a hot, dense origin of the universe -the standard Big Bang cosmology -and enable its evolution to be traced back fairly reliably to the nucleosynthesis era when the temperature was of O(1) MeV corresponding to an expansion age of O(1) sec. All particles, known and hypothetical, would have been created at higher temperatures in the early universe and analyses of their possible effects on the abundances of the synthesized elements enable many interesting constraints to be obtained on particle properties. These arguments have usefully complemented laboratory experiments in guiding attempts to extend physics beyond the Standard SU (3) c ⊗SU (2) L ⊗U (1) Y Model, incorporating ideas such as supersymmetry, compositeness and unification. We first present a pedagogical account of relativistic cosmology and primordial nucleosynthesis, discussing both theoretical and observational aspects, and then proceed to examine such constraints in detail, in particular those pertaining to new massless particles and massive unstable particles. Finally, in a section aimed at particle physicists, we illustrate applications of such constraints to models of new physics.

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Photonuclear reactions at intermediate energies (40 MeV⩽Eγ⩽400 MeV)

Cited by 119 publications

References 57 publications

Overlap functions in correlation methods and quasifree nucleon knockout from16O

Overlap functions in correlation methods and quasifree nucleon knockout from16O

Short-Range Correlations and Meson Exchange Currents in Photonucleon Emission

Big bang nucleosynthesis and physics beyond the standard model

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