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K and K^* Exchange Effects in Lambda Hypernuclei

K and K^* Exchange Effects in Lambda Hypernuclei
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摘要 We study the effects of K and K^* exchange between the A hyperon and the nucleon in a A hypernueleus, 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 A particle in hypernuclei. Both vector and tensor couplings for K^* exchange are taken into account, whose combined effect on the A single-particle energy is found to be small. We study the effects of K and K^* exchange between the A hyperon and the nucleon in a A hypernueleus, 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 A particle in hypernuclei. Both vector and tensor couplings for K^* exchange are taken into account, whose combined effect on the A single-particle energy is found to be small.
作者 文武 申虹
机构地区 Department of Physics
出处 《Chinese Physics Letters》 SCIE CAS CSCD 2010年第4期71-74,共4页 中国物理快报(英文版)
基金 Supported by the National Natural Science Foundation of China under Grant No 10675064.
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