Coherent coupled-reaction-channels analysis of existing and new p + Be9 data between 1.7 and 15 MeV/nucleon

Abstract

New data for the elastic scattering of 9 Be from protons were obtained and analyzed together with data from the literature in a coherent coupled-reaction-channels approach. The new measurements were performed in inverse kinematics at 15, 22 and 51 MeV (1.67, 2.44, and 5.67 MeV/nucleon) by detecting the heavy ejectile in the MAGNEX spectrometer. This enabled an almost full angular distribution to be obtained, extending the results to forward angles where calculated values coincide and give the opportunity of proper normalization. Previous inconsistencies in absolute normalization between different data sets are removed. Standard collective model form factors fail to reproduce the inelastic scattering to the 2.43 MeV 5/2 − state of 9 Be, suggesting that a more sophisticated approach based on the cluster structure of 9 Be is required to describe this process.

A Microscopic Approach for $p+^9$Be at Energies Between 1.7 to 15 MeV/nucleon

“…It also supports the conclusion of Ref. [1] of little or no contribution from compound elastic processes at these energies. While it would be desirable to confirm this by explicit calculation of the compound elastic contribution, this is not straightforward, especially for light systems.…”

“…The present analysis provides independent support for the normalization choices made in Ref. [1], since the data are adequately described by the consistent JLM calculations. It also supports the conclusion of Ref.…”

“…A considerable amount of elastic scattering data for protons incident on a 9 Be target at low energies has appeared in the literature during the past forty years. A recent measurement in inverse kinematics at three energies between 1.7 to 5.7 MeV/nucleon [1] motivates the present research in the following context. The previous measurements and analyses were carried out under quite different conditions giving occasionally contradictory results with respect to the absolute normalization of the cross sections.…”

“…Inconsistencies were traced and removed via a coherent coupled reaction channels (CRC) analysis evaluating results at energies between 1.7 to 15 MeV/nucleon in Ref. [1]. Therefore, these results, free from normalization problems, may be used for systematic theoretical investigations.…”

“…In the present work, we apply the Jeukenne, Lejeune and Mahaux model [2] to the consistent set of p+ 9 Be elastic scattering data evaluated in Ref. [1]. The potential was calculated using the code developed by Dietrich with the "standard" normalization for light nuclei (λ V = 1.0 and λ W = 0.8).…”