C13(p, γ)N14 1.47- and 2.11-Mev Resonances and the Odd-Parity Levels of Mass 14

E. K. Warburton, H. J. Rose, and E. N. Hatch
Phys. Rev. 114, 214 – Published 1 April 1959
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Abstract

A study has been made of the γ rays emitted by the 8.9- and 9.5-Mev levels of N14 using the C13(p, γ)N14 reaction at the 1.47- and 2.11-Mev resonances. The decay schemes of these levels were reinvestigated using a three-crystal pair spectrometer, NaI(Tl) single-crystal measurements, and standard γγ coincidence techniques. The anisotropies relative to the bombarding beam of most of the observed γ transitions were measured using the three-crystal pair spectrometer. The angular distributions of some of the γ transitions were measured using a single NaI(Tl) crystal. Measurements were made of the Doppler shifts of the ground state decay of the N14 5.10-Mev level and the cascade from the N14 5.83-Mev level to the N14 5.10-Mev level. From these Doppler shift measurements the mean lifetime of the N14 5.83-Mev level was found to be in the range (5.65)×1014 sec; while an upper limit of 3×1013 sec was set on the mean life of the N14 5.10-Mev level. The results of the study of the γ decay of the N14 9.5- and 8.9-Mev levels combined with the results of earlier measurements give conclusive assignments of 2, 3, 3, and 2 for the N14 levels at 9.50, 8.90, 5.83, and 5.10 Mev. The 5.83-Mev level most probably has odd parity. A tentative assignment of J=2 is given to the N14 7.02-Mev level. Evidence is presented, from this and previous investigations, that indicates the N14 8.06-, 8.70-, 8.90-, and 9.50-Mev levels arise from the s4p92s and s4p9d configurations with the largest contribution being from the (p122s12) configuration for the 8.06- and 8.70-Mev levels and from the (p12d52) configuration for the 8.90- and 9.50-Mev levels. The analogs of these T=1 levels in C14 are almost certainly the C14 6.09-, 6.89-, 6.72-, and 7.35-Mev levels, respectively. The T=0, s4p92s and s4p9d states of N14 are also discussed. It is proposed that the 4.91-, 5.69-, 5.10-, and 5.83-Mev levels of N14 are 0 and 1, s4p92s12 and 2 and 3, s4p9d52 states, respectively.

  • Received 11 November 1958

DOI:https://doi.org/10.1103/PhysRev.114.214

©1959 American Physical Society

Authors & Affiliations

E. K. Warburton*

  • Brookhaven National Laboratory, Upton, New York and Palmer Physical Laboratory, Princeton University, Princeton, New Jersey

H. J. Rose and E. N. Hatch

  • Brookhaven National Laboratory, Upton, New York

  • *Present address: Palmer Physical Laboratory, Princeton University, Princeton, New Jersey.
  • Now at Freiburg University, Freiburg, Germany.
  • Present address: Scientific and Technical Unit, U. S. Naval Forces, Frankfurt, Germany.

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Vol. 114, Iss. 1 — April 1959

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