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Microscopic analysis of extranuclear capture on the [Formula Presented] reaction

par Baye, Daniel Jean ;Descouvemont, Pierre ;Hesse, Michel
Référence Physical review. C. Nuclear physics, 58, 1, page (545-553)
Publication Publié, 1998

Article révisé par les pairs

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Résumé :

Starting from a fully microscopic calculation, the [Formula Presented] radiative-capture reaction is discussed in detail. The generator-coordinate and microscopic [Formula Presented]-matrix methods are applied to the determination of the bound states and phase shifts of the [Formula Presented] system, where [Formula Presented] is described by a closed [Formula Presented] shell cluster. The astrophysical [Formula Presented] factor is then calculated and compared with experiment. A study of its behavior at very low energies leads to general quantal formulas for the [Formula Presented] factor and for its logarithmic derivative at zero energy, which are valid for all cases where capture dominantly occurs when both nuclei are far from each other. The larger capture to the [Formula Presented] excited state is then explained by its lower binding energy without need for a special halo effect. The logarithmic derivative at zero energy is shown to depend on a slowly varying function of the bound-state Sommerfeld parameter and its different values for capture to the [Formula Presented] and [Formula Presented] states are explained. The same expressions are applied to the [Formula Presented] reaction. © 1998 The American Physical Society.