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Phys. Rev. Lett. 78, 606 - 609 (1997)

Measurement of the E2/M1 Ratio in the N→Δ Transition using the reaction p(γ→,p)πo
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R. Beck1, H. P. Krahn1, J. Ahrens1, H. J. Arends1, G. Audit2, A. Braghieri3, N. d'Hose2, S. J. Hall4, V. Isbert1, J. D. Kellie4, I. J. D. MacGregor4, P. Pedroni3, T. Pinelli3, G. Tamas2, Th. Walcher1, and S. Wartenberg1
1Institut für Kernphysik, Universität Mainz, 55099 Mainz, Germany
2Service de Physique Nucléaire-Departement d'Astrophysique, Physique des Particules, Physique Nucleaire et d'Instrumentation Assocciee, CE. Saclay, 91191 Gif-sur-Yvette, France
3Istituto Nazionale di Fisica Nucleare, Sezione di Pavia, 27100 Pavia, Italy
4Department of Physics and Astronomy, Glasgow University, Glasgow G12 8QQ, United Kingdom

 See Also: Erratum

Received 28 August 1996

The small electric quadrupole E2 amplitude of the predominantly magnetic dipole M1 p→Δ(1232) transition has been measured using 270 to 420 MeV tagged linearly polarized photons in the p(γ→,p)πo reaction at the Mainz Microtron MAMI. Differential cross sections and photon asymmetries were determined by measuring the recoil proton in the cylindrically symmetric 4π detector DAPHNE. From the proton angular distributions the ratio E2/M1  =  -(2.5±0.2±0.2)% at the maximum of the Δ(1232) resonance has been derived.


©1997 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v78/p606
DOI: 10.1103/PhysRevLett.78.606
PACS: 13.60.Le, 13.60.Rj, 14.20.Gk, 25.20.Lj

See Also

Erratum: R. Beck, H. P. Krahn, J. Ahrens, H. J. Arends, G. Audit, A. Braghieri, N. d'Hose, S. J. Hall, V. Isbert, J. D. Kellie, I. J. MacGregor, P. Pedroni, T. Pinelli, G. Tamas, Th. Walcher, and S. Wartenberg, Measurement of the E2/M1 Ratio in the N → Δ Transition Using the Reaction p(γ→,p)π0 [Phys. Rev. Lett. 78, 606 (1997)], Phys. Rev. Lett. 79, 4515 (1997)

Comment: R. L. Workman, E2/M1 Ratio from the Mainz p(γ→,p)π0 Data, Phys. Rev. Lett. 79, 4511 (1997)

Comment: R. M. Davidson and Nimai C. Mukhopadhyay, Mainz Measurement of the E2/M1 Ratio in the N-Δ Transition, Phys. Rev. Lett. 79, 4509 (1997)

Reply: R. Beck and H.-P. Krahn, Beck and Krahn Reply:, Phys. Rev. Lett. 79, 4512 (1997)

Reply: R. Beck and H.-P. Krahn, Beck and Krahn Reply:, Phys. Rev. Lett. 79, 4510 (1997)

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