Abstract
Recent statistical multistep analyses of the pre-equilibrium reaction93Nb(p, α) at incident energies of 65 and 100 MeV are reviewed. It is shown that the α-cluster structure of the target nucleus is prominently displayed at the lower incident energy, whereas at the higher value its presence is obscured by the dominance of three-nucleon pickup. This result appears to be simply associated with a difference in the details of the effective momentum mismatch experienced by a cluster knockout mechanism, as opposed to a pickup process.
Highlights
It has been known for many years that the mechanism of pre-equilibrium (p, α) reactions reveals itself as closely related to a basic statistical multistep process
Results of explicit distorted-wave Born approximation (DWBA) calculations are presented in Ref. [4], of which Fig. 3 is an adapted version
Cross sections associated with either pickup or cluster knockout have been extracted from the experimental results as described in Ref. [4], and theoretical calculations are normalized to the extracted cross section values
Summary
It has been known for many years that the mechanism of pre-equilibrium (p, α) reactions reveals itself as closely related to a basic statistical multistep process. The shapes of analyzing power angular distributions are especially sensitive to competition between cluster knockout and three-nucleon pickup as part of the statistical multistep chain. In this way Bonetti et al [2] found that the 58Ni(p, α) reaction at an incident energy of 72 MeV displays the features associated with cluster knockout exclusively. On 93Nb, but at an incident energy of 100 MeV, three-nucleon pickup clearly dominates [4] An explanation of this unusual incident-energy dependence is offered in Ref. The purpose of this paper is to review the evidence presented in Ref. [4, 5], and to draw conclusions regarding the possible trend expected for the target dependence of the observed phenomenon
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
