N14 Levels from Elastic Scattering of Protons by C13

V. A. Latorre and J. C. Armstrong
Phys. Rev. 144, 891 – Published 22 April 1966
PDFExport Citation

Abstract

The differential cross section for elastic scattering of protons from C13 has been measured to an accuracy of 7% for proton energies from 1.0 to 2.6 MeV at center-of-mass scattering angles of 39.2°, 54.7°. 90.0°, and 125.3°. Thin targets were prepared from methyl iodide enriched to 62% in C13 and the scattered protons were analyzed using a double-focusing magnetic spectrometer. Proton groups corresponding to C12 and C13 were cleanly separated except for energies below 1.8 MeV at 39.2° and 54.7°. A theoretical curve calculated from a two-level formula was fitted to the data over the entire energy range. Seven resonances, all previously observed, were necessary to fit the data. The laboratory resonance energies (MeV), center-of-mass reduced widths (MeV cm×1013) and Jπ values assigned in this analysis are as follows: 1.150±0.002, 0.19, 0+; 1.366±0.050, 3.60, 0; 1.461±0.003, 1.76, 3, 1.540±0.003, 0.09, 2+; 1.980±0.003, 0.45, 3(2); 2.110±0.003, 1.66, 2; 2.319±0.005, 0.09, 1+. These resonance energies and reduced widths are in fair agreement with previous measurements. The spin and parity assignments for all levels, except those at Ep=1.540 MeVand 1.980 MeV, confirm previous experiments. The 1.540-MeV resonance had previously been assumed to have Jπ=1+ and the 1.980-MeV resonance had been assigned Jπ=1. Comparison of experiment and theory suggests the possibility of a broad resonance having J1 in the vicinity of Ep=2.8 MeV.

  • Received 1 December 1965

DOI:https://doi.org/10.1103/PhysRev.144.891

©1966 American Physical Society

Authors & Affiliations

V. A. Latorre* and J. C. Armstrong

  • Department of Physics and Astronomy, University of Maryland, College Park, Maryland

  • *Now at Universidad Nacional de Ingenierfa, Lima, Peru.
  • Now at Institute for Defense Analyses, Arlington, Virginia.

References (Subscription Required)

Click to Expand
Issue

Vol. 144, Iss. 3 — April 1966

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review Journals Archive

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×