NEAR-THRESHOLD PHOTOPRODUCTION OF ETA-MESONS FROM THE DEUTERON

被引：121
|
作者：
KRUSCHE, B
AHRENS, J
ANNAND, JRM
ANTON, G
BECK, R
FUCHS, M
GABLER, AR
HARTER, F
HEJNY, V
KELLIE, JD
MCGEORGE, JC
METAG, V
PEISE, J
ROBIGLANDAU, M
SCHUBERT, A
STROHER, H
机构：
[1] UNIV MAINZ,INST KERNPHYS,D-55099 MAINZ,GERMANY
[2] UNIV GLASGOW,DEPT PHYS & ASTRON,GLASGOW,LANARK,SCOTLAND
[3] UNIV BONN,INST PHYS,D-53115 BONN,GERMANY
[4] GESELL SCHWERIONENFORSCH MBH,D-64220 DARMSTADT,GERMANY
来源：
PHYSICS LETTERS B | 1995年 / 358卷 / 1-2期
关键词：
D O I：
10.1016/0370-2693(95)00985-T
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The first measurement of incoherent eta-photoproduction from the deuteron in the threshold region is reported. The experiment was carried out at the MAMI accelerator with the TAPS spectrometer. Total and differential inclusive cross sections have been obtained between 627 and 790 MeV. it is found that the reaction is completely dominated by the incoherent part. An upper limit for coherent eta-photoproduction on the deuteron is deduced, which is substantially lower than the result from an earlier measurement. The incoherent cross section is reproduced in a participant-spectator approach under the assumption of an energy-independent ratio between the neutron and proton cross sections. Best agreement is found for the ratio sigma(n)/sigma(p) approximate to 2/3. The implications for the isospin components of the electromagnetic excitation of the S-11(1535) resonance are discussed.
引用
收藏
页码：40 / 46
页数：7
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