PION-NUCLEUS SCATTERING AND BARYON RESONANCES IN THE NUCLEAR MEDIUM

被引：8

作者：

CHEN, CM

ERNST, DJ

JIANG, MF

JOHNSON, MB

机构：

[1] VANDERBILT UNIV, DEPT PHYS & ASTRON, NASHVILLE, TN 37235 USA

[2] LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA

来源：

PHYSICAL REVIEW C | 1995年 / 52卷 / 02期

关键词：

D O I：

10.1103/PhysRevC.52.R485

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：

Pion-nucleus total cross sections are examined for pion laboratory kinetic energies between 400 MeV and 1 GeV. Modifications by the nuclear medium of the dominant D-13(1520) and F-15(1680) excited hadrons are investigated. Fermi motion and multiple scattering are found to broaden significantly the peaks in the cross section. Additional broadening as determined from a model of photon-nucleus total cross sections is found to further reduce the cross sections and increase the discrepancy between theory and data. The discrepancy, nearly energy-independent and of the order of 15-20 %, can be accounted for if one assumes the nuclear medium causes a 31-42 % increase in the strength of the pion-nucleon interaction in all channels.

引用

页码：R485 / R489

页数：5

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