Alpha-cluster structure in the ground state of 40Ca displayed in a (p,pα) knockout reaction

10th International Conference on Clustering Aspects of Nuclear Structure and Dynamics

Cowley, A.A.^1,2

Department of Physics, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa^1

iThemba Laboratory for Accelerator Based Sciences, P O Box 722, Somerset West 7129, South Africa^2

关键词: Analyzing power;    Cluster structure;    Distorted waves;    Distorted-wave impulse approximations;    Incident energy;    Knockout reactions;    Reaction mechanism;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/436/1/012011/pdf
DOI  :  10.1088/1742-6596/436/1/012011

来源: IOP

【 摘 要 】

The analyzing power is very sensitive to details of the reaction mechanism of (p, pα) knockout reactions in the incident energy range of approximately 100 MeV and higher. Whereas distorted wave impulse approximation calculations in the past proved to give an excellent reproduction of analyzing power angular distributions for quasifree (p, pα) reactions on light targets such as6Li,9Be and12C, the situation for40Ca was not as simple. It is now shown that the theory also offers good agreement with the experimental distribution of the heaviest target nucleus if care is taken to use proper distorted waves which treat α-36Ar properly as a system for which α-elastic scattering is anomalous. Thus it is shown that40Ca reveals its ground state α-cluster structure in an unambiguous way similar to the light target nuclei.