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. (doi: 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: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: McGeorge, Dr John and Owens, Professor 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