Mechanism of the O16(Li7,α)F19 reaction at 20 MeV

S. Mordechai and H. T. Fortune
Phys. Rev. C 30, 1924 – Published 1 December 1984
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Abstract

The O16(Li7,α)F19 reaction has been investigated at an incident energy of 20 MeV. Complete angular distributions were measured in the angular range θlab=7.5°157.5° using a multiangle spectrograph. Known (sd)3 states are populated about twice as strongly as the core-excited four-particle—one-hole (4p-1h) states. Angular distributions for members of the ground-state band show only a moderate forward-angle rise, and those of the negative-parity band and other weak states are approximately symmetric around 90°. Results have been analyzed in terms of Hauser-Feshbach compound-nucleus calculations and finite-range distorted-wave Born approximation calculations in which the three transferred nucleons enter the sd and/or 1p shells. The contribution of the compound-nucleus cross section has been estimated. The data for the Kπ=12+ and Kπ=12 bands in F19 could be well fitted by an incoherent sum of direct and compound reaction cross sections. Simple analysis of the integrated cross sections based on a (2J+1) rule is consistent with results of the Hauser-Feshbach calculations. Comparison between the present experimental results and previous triton cluster transfer reactions on O16 emphasizes the enhanced compound/direct ratio for the 4p-1h and other weak states in the present data.

  • Received 18 June 1984

DOI:https://doi.org/10.1103/PhysRevC.30.1924

©1984 American Physical Society

Authors & Affiliations

S. Mordechai* and H. T. Fortune

  • Physics Department, University of Pennsylvania, Philadelphia, Pennsylvania 19104

  • *Permanent address: Department of Physics, Ben-Gurion University of the Negev, Beer-Sheva, Israel.

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Vol. 30, Iss. 6 — December 1984

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