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Angular momentum in subbarrier fusion [electronic resource].

Published
Washington, D.C : United States. Dept. of Energy. Office of Energy Research, 1990.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: (10 pages) : digital, PDF file
Additional Creators
Lawrence Berkeley National Laboratory, United States. Department of Energy. Office of Energy Research, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
We have measured the ratio of the isomer to ground-state yields of ¹³⁷Ce produced in the fusion reactions ¹²⁸Te(¹²C,3n), ¹³³Cs(⁷Li,3n), ¹³⁶Ba(³He,2n), ¹³⁶Ba(⁴He,3n), and ¹³⁷Ba(³He,3n), from energies above the Coulomb barrier to energies typically 20--30% below the barrier by observing the delayed x- and γ-ray emission. We deduce the average angular momentum, >J<, from the measured isomer ratios with a statistical model. In the first three reactions we observe that the values of >J< exhibit the behavior predicted for low energies and the expected variation with the reduced mass of the entrance channel. We analyze these data and the associated cross sections with a barrier penetration model that includes the coupling of inelastic channels. Measurements of average angular momenta and cross sections made on other systems using the γ-multiplicity and fission-fragment angular correlation techniques are then analyzed in a similar way with this model. The discrepancies with theory for the γ-multiplicity data show correlations in cross section and angular momentum that suggest a valid model can be found. The measurements of angular momentum using the fission fragment angular correlation technique, however, do not appear reconcilable with the energy dependence of the cross sections. This systematic overview suggests, in particular, that our current understanding of the relationship of angular momentum and anisotropy in fission fragment angular correlations is incomplete. 26 refs.
Report Numbers
E 1.99:lbl-29135
E 1.99: conf-9005221--8
conf-9005221--8
lbl-29135
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
05/01/1990.
"lbl-29135"
" conf-9005221--8"
"DE90015721"
Interface between nuclear structure and heavy-ion reaction dynamics conference, Notre Dame, IN (USA), 24-26 May 1990.
DiGregorio, D.E.; Chan, Y.D.; Norman, E.B.; Pouliot, J.; Harmon, B.A.; Stokstad, R.G.; Lesko, K.T.; Sur, B.
Funding Information
AC03-76SF00098
View MARC record | catkey: 14671443