Lifetimes of levels in F20,21, Ne22, and N16

R. L. Kozub, J. Lin, J. F. Mateja, C. J. Lister, D. J. Millener, J. W. Olness, and E. K. Warburton
Phys. Rev. C 27, 158 – Published 1 January 1983
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Abstract

The recoil distance method has been used to measure the mean lifetime of the Jπ=92+ 1755-keV level of F21, formed (predominantly) via the Li7(O18, α)F21 fusion-evaporation reaction. The lifetimes of the 984- and 1309-keV levels of F20 and the 1275-keV level of Ne22 were obtained coincidentally. Similar measurements in the Li7(B11, pn)N16 reaction determine the lifetimes of the 298- and 397-keV levels of N16. Data were acquired at θγ=0° using an escape suppression spectrometer, with O18 and B11 incident energies of 28.5 and 15.3 MeV, respectively. The experimental results are the following: N16(298,3), τ=133±4 ps; N16(397,1), τ=6.60±0.48 ps; F20(984,1), τ=1.8±0.3 ps; F20(1309,2), τ=1.9±0.3 ps; F21(1755, 92+), τ=3.5±0.5 ps; Ne22(1275,2+), τ=5.1±0.2 ps. Shell-model calculations for N16 and F20,21 have been performed and are compared to experimental results.

NUCLEAR REACTIONS Li7 + O18, E(O18)=1060 MeV; Li7 + B11, E(B11)=735 MeV; measured Eγ, Iγ (recoil distance method); deduced τ(F20,21, Ne22, N16); calculated B(ML) from theory and compared to experiment.

  • Received 17 June 1982

DOI:https://doi.org/10.1103/PhysRevC.27.158

©1983 American Physical Society

Authors & Affiliations

R. L. Kozub, J. Lin*, and J. F. Mateja

  • Department of Physics, Tennessee Technological University, Cookeville, Tennessee 38501

C. J. Lister, D. J. Millener, J. W. Olness, and E. K. Warburton

  • Brookhaven National Laboratory, Upton, New York 11973

  • *Presently at Hewlett Packard Corp., Palo Alto, CA 94302.

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Vol. 27, Iss. 1 — January 1983

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