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Determination of the E2/M1 ratio in the gamma N to Delta (1232) transition from a simultaneous measurement of p( gamma ,p) pi /sup 0/ and p( gamma , pi /sup +/)n

Beck, R. et al. (2000) Determination of the E2/M1 ratio in the gamma N to Delta (1232) transition from a simultaneous measurement of p( gamma ,p) pi /sup 0/ and p( gamma , pi /sup +/)n. Physical Review C, 61 (3). art 035204. ISSN 0556-2813 (doi:10.1103/PhysRevC.61.035204)

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Publisher's URL: http://dx.doi.org/10.1103/PhysRevC.61.035204

Abstract

Tagged linearly polarized photons have been used at the Mainz Microtron (MAMI) for simultaneous measurements of the p( gamma ,p) pi /sup 0/ and p( gamma , pi /sup +/)n reaction channels to study the gamma N to Delta (1232) transition. The energy dependence of the magnetic dipole M/sub 1+//sup 3/2/ and electric quadrupole E/sub 1+//sup 3/2/ amplitudes have been extracted from these data in the photon energy range from 270 to 420 MeV. The E2/M1 ratio for the gamma N to Delta (1232) transition has been determined to be -(2.5+or-0.1/sub stat/+or-0.2/sub sys/)% at the resonance position ( delta /sub 33/=90 degrees ).

Item Type:Article
Status:Published
Refereed:Yes
Glasgow Author(s):McGeorge, Dr John and Owens, Prof Robert and Annand, Dr John
Authors: Beck, R., Krahn, H.P., Ahrens, J., Annand, J.R.M., Arends, H.J., Audit, G., Braghieri, A., d'Hose, N., Drechsel, D., Hanstein, O., McGeorge, J.C., Owens, R.O., Pedroni, P., Pinelli, T., Tamas, G., Tiator, L., and Walcher, T.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review C
ISSN:0556-2813

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