CAJ | 학술논문

在相对论平均场框架下,根据夸克介子耦合模型思想引入密度相关的标量耦合系数gNσ ,计算了密度相关耦合系数下,核物质标量密度、五夸克重子态(θ) +有效质量随核物质密度的变化情况,并与不变耦合系数下情况相比较.发现在低密度区域,密度相关的耦合系数对其影响很小,但在高密区域影响明显.表明,在密度相关的耦合系数影响下,标量介子与重子的相互作用在高密度区域被削弱.
재상대론평균장광가하,근거과극개자우합모형사상인입밀도상관적표량우합계수gNσ ,계산료밀도상관우합계수하,핵물질표량밀도、오과극중자태(θ) +유효질량수핵물질밀도적변화정황,병여불변우합계수하정황상비교.발현재저밀도구역,밀도상관적우합계수대기영향흔소,단재고밀구역영향명현.표명,재밀도상관적우합계수영향하,표량개자여중자적상호작용재고밀도구역피삭약.
The properties of baryons in nuclear matter are analysed in the relativistic mean-field theory(RMF).It is found that the scalar field σ meson affects the properties of baryon at high density.A density dependent scalar coupling gNσ is determined according to the idea of quark-meson coupling model and extended to RMF.It is shown that gNσ affects the property of nuclear matter weakly at low density,but strongly at high density.The relation between the scalar density ρs and the nuclear density ρand the effective mass of the pentaquark (θ)+ are studied with the density dependent coupling constant.The density dependent scalar coupling obviously affects the effective masses of baryons in nuclear matter,especially at high density.