A Study of T=32 States in N13

M. J. LeVine and P. D. Parker
Phys. Rev. 186, 1021 – Published 20 October 1969
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Abstract

A study of T=32 states in N13 was carried out by observing these states as resonances in the compound system C12+p The lowest T=32 state was observed as a resonance in the proton elastic scattering at Ep=14.231±0.004 MeV. A search for additional T=32 states was carried out by measuring excitation functions for elastic scattering and for several proton-induced reactions over the proton energy range 17.0-21.5 MeV; two anomalies were found at Ep=17.80 and 18.459 MeV, whose widths and locations suggest that they might correspond to T=32 states. In order to obtain the spins, parities, and elastic partial widths for the observed resonances, a program of phase-shift analysis was carried out using optical-model phases plus a single-level dispersion term. Such an analysis of the 14.231-MeV resonance yielded the assignment of Jπ=32. From a similar analysis, one obtains Jπ=32+ for the 17.80-MeV resonance, while the 18.459-MeV resonance was limited to spin and parity assignments of 32 or 72+. These assignments for the 17.80- and 18.459-MeV resonances, and the observed intensities for their proton decay to the 15.11-MeV state in C12 are consistent with their identification as T=32 states. Five other resonances, thought to correspond to T=12 states, were observed at Ep=13.035, 15.220, 17.67, 19.40, and 19.46 MeV and were also analyzed in a similar fashion to yield spin and parity assignments of 32+, 72+, ½, 52, and 32+, respectively.

  • Received 2 May 1969

DOI:https://doi.org/10.1103/PhysRev.186.1021

©1969 American Physical Society

Authors & Affiliations

M. J. LeVine* and P. D. Parker

  • Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520

  • *Present address: Physics Department, Brookhaven National Laboratory, Upton, N. Y.

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Issue

Vol. 186, Iss. 4 — October 1969

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