高能物理与核物理
高能物理與覈物理
고능물리여핵물리
HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS
2007年
5期
470-474
,共5页
巨单极共振%相对论无规位相近似%对称能%同位旋标量-同位旋矢量介子的非线性耦合
巨單極共振%相對論無規位相近似%對稱能%同位鏇標量-同位鏇矢量介子的非線性耦閤
거단겁공진%상대론무규위상근사%대칭능%동위선표량-동위선시량개자적비선성우합
giant monopole resonances%relativistic random phase approximation%symmetry energy%isoscalar and isovector non-linear coupling
基于带有混合同位旋标量-矢量非线性耦合的有效拉格朗日量,在完全自洽的相对论无规位相近似的框架内,通过单极压缩模式讨论了核物质的不可压缩性.比较核208Pb,144Sm,116Sn和90Zr实验和计算的巨单极共振能量,给出了核物质不可压缩系数的取值范围.新的同位旋标量-矢量非线性耦合软化核物质的对称能,但无损于基态性质与实验的一致性.讨论了对称能的软化对巨单极共振的影响.
基于帶有混閤同位鏇標量-矢量非線性耦閤的有效拉格朗日量,在完全自洽的相對論無規位相近似的框架內,通過單極壓縮模式討論瞭覈物質的不可壓縮性.比較覈208Pb,144Sm,116Sn和90Zr實驗和計算的巨單極共振能量,給齣瞭覈物質不可壓縮繫數的取值範圍.新的同位鏇標量-矢量非線性耦閤軟化覈物質的對稱能,但無損于基態性質與實驗的一緻性.討論瞭對稱能的軟化對巨單極共振的影響.
기우대유혼합동위선표량-시량비선성우합적유효랍격랑일량,재완전자흡적상대론무규위상근사적광가내,통과단겁압축모식토론료핵물질적불가압축성.비교핵208Pb,144Sm,116Sn화90Zr실험화계산적거단겁공진능량,급출료핵물질불가압축계수적취치범위.신적동위선표량-시량비선성우합연화핵물질적대칭능,단무손우기태성질여실험적일치성.토론료대칭능적연화대거단겁공진적영향.
Nuclear matter incompressibility is discussed by the monopole compression modes in nuclei in the framework of a fully consistent relativistic random phase approximation, based on effective Lagrangians with a mixed isoscalar-isovector nonlinear coupling term. A predicted value of the matter incompressibility coefficient is given by comparison between experimental and calculated energies of the isoscalar giant monopole resonance (ISGMR) in nuclei 208Pb, 144Sm, 116Sn and 90Zr. The new isoscalar-isovector nonlinear coupling softens the nuclear matter symmetry energy without ruining the agreement with experimentally existing ground state properties. The effect of the softening of the symmetry energy on the ISGMR is discussed.
