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Unexpected transparency in low energy [Formula Presented] scattering and [Formula Presented]-cluster structure in [Formula Presented]

par Michel, Francis;Reidemeister, Guy ;Ohkubo, Shigeo
Référence Physical review. C. Nuclear physics, 61, 4, page (5)
Publication Publié, 2000

Article révisé par les pairs

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Résumé :

We show that incomplete absorption in [Formula Presented] scattering is responsible for the spectacular dip observed in the backward excitation function at low energy [Formula Presented] 25 MeV), which we interpret as a destructive interference effect between the barrier and internal wave contributions to the scattering amplitude. Because of this transparency, an optical potential, which is in line with the higher energy data, can be extracted with good accuracy. The real part of this potential is found to support several rotational bands; the properties of the states of the first Pauli-allowed band, with [Formula Presented] in particular the electromagnetic transition rates between the first states, are in good agreement with those of the states of the experimental [Formula Presented] ground state band, suggesting that [Formula Presented]-cluster structure is still an important feature in the [Formula Presented] region. © 2000 The American Physical Society.