| NUCLEAR PHYSICS |
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K and K* Exchange Effects in Lambda Hypernuclei |
WEN Wu, SHEN Hong |
| Department of Physics, Nankai University, Tianjin 300071 |
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| Cite this article: |
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WEN Wu, SHEN Hong 2010 Chin. Phys. Lett. 27 042101 |
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Abstract We study the effects of K and K*exchange between the Λ hyperon and the nucleon in a Λ hypernucleus, where the nuclear core is described by a successful relativistic mean-field (RMF) model. In general, K and K* are responsible for strangeness exchange in the one-boson-exchange potential model, which are absent in the RMF calculation. We investigate the contribution of Fock terms derived from K and K* exchange. We use a pseudovector coupling for K exchange, which is found to provide a repulsive potential for the Λ particle in hypernuclei. Both vector and tensor couplings for K* exchange are taken into account, whose combined effect on the Λ single-particle energy is found to be small.
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| Keywords:
21.80.+a
21.60.Jz
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Received: 04 November 2009
Published: 27 March 2010
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| PACS: |
21.80.+a
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(Hypernuclei)
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21.60.Jz
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(Nuclear Density Functional Theory and extensions (includes Hartree-Fock and random-phase approximations))
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