Elsevier

Nuclear Physics A

Volume 95, Issue 2, 1 April 1967, Pages 241-270
Nuclear Physics A

The structure of the giant dipole resonance: (IV). The angular distributions of 15N(p, γ0)16O

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Abstract

The angular distributions of the gamma rays from the 15N(p, γ0)16O reaction have been studied at 60 different energies between 13 and 25 MeV excitation in 16O. In general, these angular distributions have a maximum value near 80° and a minimum at 0°. The experimental errors were in the region 3–5%. The Legendre polynomial coefficients A0 to A3 were extracted from the data and with this information spins and parities were assigned to different parts of the cross section. Most of the cross section is due to d-wave protons forming 1 states in 16O. Even the 13.08 MeV state, heretofore thought o be nearly pure p−12s, has a large p−1d component. Two 2+ states were observed near 15.25 and 19.1 MeV. Above 20 MeV the angular distributions were very similar and indicated the presence of a very broad 2+ state. In addition, the data may imply the presence of a very broad 1 state, as distinct from the several sharp 1 states apparently seen in the region of giant dipole excitation. A comparison with the coupled-channel shell-model calculations of Buck and Hill 2) is very encouraging and implies a major success for the shell model.

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    Present address: Chalk River Nuclear Laboratories, Canada.

    2

    We greatly appreciate the co-operation of many members of the staff at AERE Harwell and AERE Aldermaston and thank Drs. G. C. Thomas, A. R. Barnett and J. L. Black for assisting in data collection. Many valuable discussions were held with Drs. G. C. Thomas and B. Buck.

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