ΛN Space-exchange effects in thes-shell hypernuclei and
Λ
9
Be |
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Authors: | Mohammad Shoeb Q N Usmani A R Bodmer |
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Affiliation: | (1) Department of Physics, Aligarh Muslim University, 202 002 Aligarh, India;(2) Department of Physics, Jamia Millia Islamia, 110 025 New Delhi, India;(3) Department of Physics, University of Illinois at Chicago, 60637 Chicago, IL, USA;(4) Physics Division, Argonne National Laboratory, IL60439 4843 Argonne, USA |
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Abstract: | Variational Monte Carlo calculations of the ground state separation energiesB
Λ of thes-shell hypernuclei and also of
Λ
9
Be have been made for an Urbana-type central space-exchange ΛN potential consistent with Λp scattering, and also including three-body ΛNN forces. Thes-shell hypernuclei are treated asA-body systems (A = baryon number), and
Λ
9
Be is analysed as a partially nine-body problem in the Λ — 2α model. The reduction ofB
Λ due to the space-exchange ΛN potential has been calculated for thes-shell hypernuclei for a range of interactions: both ΛN and ΛN + ΛNN forces. ForA = 3,4,5 the exchange energy is approximately, 0.04, 0.15 and 0.50 MeV, respectively. For
Λ
9
Be a much more limited study gives ≅ 1.3 MeV. These values are much larger than that for ‘soft’ ΛN +NN potentials when the correlations are weak.
Preliminary results were presented at the DAE Symp. on ‘Nuclear Physics’ Vol. 32B (1989). |
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Keywords: | Hypernuclei space-exchange Λ N potential variational Monte Carlo Λ N scattering |
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