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Energy Levels of Li6 from the Deuteron-Helium Differential Cross Sections

A. Galonsky* and M. T. McEllistrem

  • University of Wisconsin, Madison, Wisconsin

  • *Now at Oak Ridge National Laboratory, Oak Ridge, Tennessee.

Phys. Rev. 98, 590 – Published 1 May, 1955Erratum Phys. Rev. 99, 1906 (1955)

DOI: https://doi.org/10.1103/PhysRev.98.590

Abstract

The deuteron-helium differential cross sections presented in the preceding paper have been analyzed in terms of a dispersion formalism to classify energy levels of Li6. A level at Ex=2.185 Mev is confirmed to be a single particle, 3+, T=0 level. The broad anomaly extending from 3 Mev to the limit of observation, 4.62 Mev, cannot be analyzed in terms of a single level. Instead, it has been fitted with two single-particle levels, a 2+ level at Ex=4.53 Mev in Li6 and a 1+ level at 5.4±0.5 Mev. The 1+ level cannot be located more accurately because only the tail is visible at the bombarding energies available. All of the other two-level combinations have been ruled out. The assignments, (3+, 2+, 1+), and locations of the levels agree with an intermediate coupling model which is close to the LS extreme. In the neighborhood of and above the 3+ resonance the usual hard-sphere phase shifts, which are always negative, cannot be used for the P-wave. This result may indicate odd-parity states above the presently investigated energy region. For the other partial waves, hard-sphere phase shifts corresponding to radii anywhere from 3 to 5×1013 cm were satisfactory, provided the reduced width of the ground state of Li6 was simultaneously varied from the Wigner limit to very small values.

Erratum

Energy Levels of Li6 from the Deuteron-Helium Differential Cross Sections

A. Galonsky and M. T. McEllistrem
Phys. Rev. 99, 1906 (1955)

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