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Title:
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Multistep direct reactions: a microscopic two-component approach
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Author(s):
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Published by:
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Publication date:
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ECN
NUCLEAIR
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1997
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ECN report number:
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Document type:
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ECN-RX--97-055
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Article (scientific)
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Number of pages:
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10
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Published in: Presented at the Specialists' meeting on the nucleon nucleus optical model up to 200 MeV, 13-15 November 1996, Bruyeres-le-Chate (), , , Vol., p.-.
Abstract:
A multistep direct reaction theory for analyzing nucleon-inducedreactions to the continuum for incident energies up to 200 MeV is presented.
Two principal advances in multistep direct theory are studied: (1) a
microscopical approach for calculating DWBA transitions to the continuum,
where transitions to all accessible 1p1h shell model states are explicitly
determined; (2) a two-component formulation of multistep direct reactions is
given, where neutron and proton excitations are explicitly accounted for in
the evolution of the reaction, for all orders of scattering. The multistep
direct theory is applied, along with theories for multistep compound,
compound, and collective reactions, to analyze experimental emission spectra
for a range of targets and energies. The sensitivity to the employed optical
model is demonstrated. It shows that the theory correctly accounts for
measured neutron an proton emission angle-integrated spectra, as well as
angular distributions. Additionally, we note that these microscopic and
two-component developments facilitate more fundamental studies into effective
nucleon-nucleon interactions in multistep calculations. 3 figs., 28 refs.
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