Abstract
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 as 6Li, 9Be and 12C, the situation for 40Ca 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 that 40Ca reveals its ground state α–cluster structure in an unambiguous way similar to the light target nuclei.
Highlights
Whereas clustering in specific excited states of atomic nuclei is a clearly-identified phenomenon, the presence of α–cluster configurations in the ground-states of nuclides is more controversial
Because cross section distributions did not suffer from this deficiency, it was not realised that those potential shapes are inappropriate for analyzing power, with its increased sensitivity to correct distorted waves in the distorted-wave impulse approximation (DWIA)
The increased sensitivity of the analyzing power distribution relative to cross section data in the knockout reaction 40Ca(p,pα)36Ar, together with the agreement between the DWIA calculation and the experimental data when an appropriate α–particle optical potential is used in the DWIA, removes any doubt as to the ground state clustering of the target nucleus
Summary
Alpha-cluster structure in the ground state of 40Ca displayed in a (p,pα) knockout reaction. View the article online for updates and enhancements. - Analyzing power distribution in the 12C(p,p)8Be reaction A. - Alpha-particle resonances and clusters in 32S, 34S, 36Ar and 40Ca Markus Norrby. - Current understanding of the reaction mechanism in two-nucleon transfer reactions A A Cowley. This content was downloaded from IP address 146.232.124.225 on 09/03/2018 at 06:16. 10th International Conference on Clustering Aspects of Nuclear Structure and Dynamics
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