Study of states in 19F and 20Ne via the (13C, 9Be) α-transfer reaction

Details Study of states in 19F and 20Ne via the (13C, 9Be) α-transfer reaction Study of states in 19F and 20Ne via the (13C, 9Be) α-transfer reaction

Nov 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976nupha.273..189p&link_type=abstract

Nuclear Physics A, Volume 273, Issue 1, p. 189-206.

Physics

Nuclear Physics

14

Nuclear Reactions

Scientific paper

It is suggested that states in 19F at 8.97, 12.26 and 12.67 MeV, observed to be strongly excited in the 15N(13C, 9Be)19F reaction at 105 MeV, have Jπ = 11/2-, 17/2- and 15/2-. The observed spectrum and cross sections are compared with the results of an SU(3) shell-model calculation of 4p-1h states in 19F, and good overall agreement is obtained. The 17/2- level should belong to the lowest Kπ = 1/2- band. The problem of identifying the Jπ = 11/2- member of this band is discussed. Consideration of γ-ray decay, triton transfer and α-transfer data leads to the conclusion that the 8.97 and 12.67 MeV levels most likely have a dominant 16O plus triton cluster configuration with a 2N + L = 7 relative motion node structure. The lowest levels of this second Kπ = 1/2- band are identified with the 6.08 MeV (3/2-) and 6.93 MeV (7/2-) levels. Selective excitation of states in 20Ne is also observed in the reaction 16O(13C, 9Be)20Ne at 105 MeV. Of particular interest is the conclusion that when kinematic effects are taken into account (via semi-classical reaction theory) the amplitudes for exciting each member of the groundstate band are approximately equal at this energy. This result accords with the predictions of the shell model for α-particle cluster transfer and is contrary to the conclusions drawn from earlier work. Finally, a comparison of cross sections to the 19F and 20Ne excited states suggests that there is little evidence for an increase in α-clustering in 19F relative to 20Ne.

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