VACUUM EFFECTS OF NONNUCLEONIC BARYONS IN NUCLEAR-MATTER

被引：5

作者：

GRIEGEL, DK

COHEN, TD

机构：

[1] Department of Physics and Astronomy, University of Maryland, College Park

来源：

NUCLEAR PHYSICS A | 1990年 / 510卷 / 04期

关键词：

D O I：

10.1016/0375-9474(90)90354-O

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

The role of vacuum properties of non-nucleonic baryons in hadronic field theories is discussed. We use an extension of Walecka's σω model treated at the mean-field level. Due to energy considerations the non-nucleonic baryons yield only vacuum effects near normal nuclear matter density. We study the effect of Roper resonance vacuum fluctuations on the nuclear matter equation of state and Coulomb sum. In addition we perform a schematic calculation of the effect of Δ-isobar vacuum fluctuations on the nuclear matter equation of state. Although the Roper resonance produces only a marginal change in the Coulomb sum, the Roper and delta may produce a significant softening of the equation of state. Thus these normally neglected degrees of freedom might serve an important role. © 1990.

引用

页码：671 / 688

页数：18

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