Elsevier

Nuclear Physics A

Volume 168, Issue 2, 14 June 1971, Pages 328-346
Nuclear Physics A

The 15N(d, n)16O reaction and states in 16O

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Abstract

Bombardment of a gaseous 15N target with deuterons has given absolute differential cross sections for the 15N(d, n)16O reaction. Complete angular distributions, taken from 0° to 150° (lab) at 4.83 and 5.84 MeV bombarding energy were analyzed with a combination of DI and CN computer programs to derive lp values and spectroscopic factors. Yield curves taken at an angle of 10° with 0.5 MeV steps from 2.5 MeV to 6.0 MeV have also been analyzed with this combination of computer programs to give energy-averaged spectroscopic factors. The states observed and the lp values are generally in agreement with those from previous (τ, d) experiments. The present results disagree with them, however, on summed strengths. Whereas the (τ, d) strengths essentially fulfill the sum-rule expectations for both the T = 0 and T = 1 components of the 2s12 and 1d52 configurations in the observed states the (d, n) results do not, thereby implying greater spreading of the strength. We observe the following fractions of the sum rule values: (2s12 T = 0): 0.48; (2s12, T = 1): 0.60; (1d52, T = 0): 0.91; and (1d52, T = 1): 0.61. There is no T-dependence of the (d, n) and (τ, d) differences. These differences, as well as averages from all experiments are compared with shell-model calculations, and these results infer greater spreading of 2s12 strength than models show. To aid in discussing transition strengths we define and use a new “fractional transfer strength” which takes the value unity for any single-particle transfer.

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    Research supported in part by the National Science Foundation.

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