Measurement of the E2/M1 ratio in the N→Δ transition

被引：0
|
作者：
Beck, R [1 ]
机构：
[1] Univ Mainz, Inst Kernphys, D-55299 Mainz, Germany
来源：
N* PHYSICS: PROCEEDINGS OF THE FOURTH CEBAF/INT WORKSHOP | 1997年 / 4卷
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D O I：
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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 small electric quadrupole E2 amplitude of the predominantly magnetic dipole M1 p --> Delta(1232) transition has been measured using 270 to 420 MeV tagged linearly polarized photons in the <(gamma)over right arrow p> --> N pi reaction at the Mainz Microtron MAMI. Differential cross sections and photon asymmetries were determined by measuring the recoil proton in the cylindrically symmetric 4 pi detector DAPHNE. From the angular distributions the ratio E2/M1 = -(2.5+/-0.2+/-0.2)% at the maximum of the Delta(1232)-resonance has been derived.
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页码：207 / 216
页数：10
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