Measurement of the E2/M1 ratio in the N->Delta transition using the reaction p((gamma)over-right-arrow,p)pi(0)

被引：215

作者：

Beck, R

Krahn, HP

Ahrens, J

Arends, HJ

Audit, G

Braghieri, A

dHose, N

Hall, SJ

Isbert, V

Kellie, JD

MacGregor, IJD

Pedroni, P

Pinelli, T

Tamas, G

Walcher, T

Wartenberg, S

机构：

[1] IST NAZL FIS NUCL,SEZ PAVIA,I-27100 PAVIA,ITALY

[2] UNIV GLASGOW,DEPT PHYS & ASTRON,GLASGOW G12 8QQ,LANARK,SCOTLAND

[3] CENS,SERV PHYS NUCL,DEPT ASTROPHYS PHYS PARTICULES PHYS NUCL & INSTRU,F-91191 GIF SUR YVETTE,FRANCE

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 78卷 / 04期

关键词：

D O I：

10.1103/PhysRevLett.78.606

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The small electric quadrupole E2 amplitude of the predominantly magnetic dipole M1 p --> Delta(1232) transition has been measured using 270 to 320 MeV tagged linearly polarized photons in the p(<(gamma)over right arrow>, p)pi(o) 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 proton angular distributions the ratio E2/M1 = -(2.5 +/- 0.2 +/- 0.2)% at the maximum of the Delta(1232) resonance has been derived.

引用

页码：606 / 609

页数：4

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