C13(p, γ)N141.47- and 2.11-Mev Resonances and

Abstract

DAY, MILLS, PERRY, AND SCHERBanalyses explain fairly successfully all nucleon-nucleon interactions up to several hundred Mev in terms of central, tensor, and spin-orbit forces that are derived from potentials with a Yukawa shape and a hard central core 19 or from the Gartenhaus potential plus a spinorbit potential. 20 A study has been made of the y rays emitted by the 8.9-and 9.5-Mev levels of N 14 using the C 13 (£/y)N 14 reaction at the 1.47and 2.11-Mev resonances. The decay schemes of these levels were reinvestigated using a three-crystal pair spectrometer, Nal(Tl) single-crystal measurements, and standard y-7 coincidence techniques. The anisotropics relative to the bombarding beam of most of the observed y transitions were measured using the threecrystal pair spectrometer. The angular distributions of some of the y transitions were measured using a single Nal(Tl) crystal. Measurements were made of the Doppler shifts of the ground state decay of the N 14 5.10-Mev level and the cascade from the N 14 5.83-Mev level to the N 14 5.10-Mev level. From these Doppler shift measurements the mean lifetime of the N 14 5.83-Mev level was found to be in the range (5-65)X 10"~1 4 sec; while an upper limit of 3X10" 13 sec was set on the mean life of the N 14 5.10-Mev level. The results of the study of the y decay of the N 14 9.5-and

Endothermic Deuteron Stripping Reactions. I. Stripping Near Threshold

“…20 The N 13 and F 17 states are known to be single-particle p n 2s% states and the N 14 state probably mostly p n 2s$ states. 23,24 The experimental information on these states has several other features in common. For all three the counter ratio increased for a greater energy interval above threshold than is compatible with s-wave emission; p-wscve emission could be involved, although the yields seem surprisingly high, while the slow rise above threshold is reminiscent of the original work on exothermic reactions which led to the proposal of the Oppenheimer-Phillips effect.…”