Subthreshold K
+ meson production in proton–nucleus reactions and nucleon spectral function |
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Authors: | SV Efremov EY Paryev |
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Institution: | (1) Bonner Nuclear Laboratory, Rice University, P.O. Box 1892, Houston, TX 77005-1892, USA, US;(2) Institute for Nuclear Research, Russian Academy of Sciences, Moscow 117312, Russia, RU |
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Abstract: | The inclusive K
+ meson production in proton–nucleus collisions in the near threshold and subthreshold energy regimes is analyzed with respect
to the one–step (pN→K
+
YN, Y=Λ,Σ) and two–step (pN→NNπ, NN2π; πN→K
+
Y) incoherent production processes on the basis of an appropriate new folding model, which takes properly into account the
struck target nucleon removal energy and momentum distribution (nucleon spectral function), extracted from recent quasielastic
electron scattering experiments and from many–body calculations with realistic models of the NN interaction. Comparison of the model calculations of the K
+ total and double differential cross sections for the reaction p+C
12 with the existing experimental data is given, illustrating both the relative role of the primary and secondary production
channels at considered incident energies and those features of the cross sections which are sensitive to the high momentum
and high removal energy part of the nucleon spectral function that is governed by nucleon–nucleon short–range and tensor correlations.
It is found that the in–medium modifications of the available for pion and kaon production invariant energies squared due
to the respective optical potentials are needed to account for considered experimental data.
Received: 2 April 1997 / Revised version: 7 August 1997 |
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Keywords: | PACS:25 40 -k Nucleon induced reactions |
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