Study of theF19(He3, d)Ne20Reaction

Abstract

The reaction ${\mathrm{F}}^{19}({\mathrm{He}}^3, d){\mathrm{Ne}}^{20}$ has been studied at ${\mathrm{He}}^3$ energies of 9.5 and 10.0 MeV. Angular distributions have been measured for deuteron groups leading to final states in ${\mathrm{Ne}}^{20}$ up to an excitation of 7.43 MeV. The elastic scattering of 9.0-MeV ${\mathrm{He}}^3$ on ${\mathrm{F}}^{19}$ has also been measured. The reaction data have been analyzed by use of the zero-range distorted-wave Born approximation and spectroscopic information has been extracted. Angular distributions characteristic of a stripping mechanism were observed for the reactions to the ground state ($l_p=0\mathrm{}$), 1.63-MeV state ($l_p=2\mathrm{}$), 5.80-MeV state ($l_p=1\mathrm{}$), 6.72-MeV state ($l_p=0\mathrm{}$), and 7.43-MeV state ($l_p=2\mathrm{}$). The reactions to the 4.25-, 4.97-, 5.63-, and 7.02-MeV excited states had small cross sections with little angular structure and were probably excited by other reaction mechanisms. The results are in reasonable agreement with the predictions of both the Nilsson model and the extreme $\mathrm{SU}\left(3\right)\mathrm{}$ classification of the shell model that assumes a dominant long-range quadrupole residual interaction.