Three-nucleon mechanisms in photoreactions

Watts, D.P. et al. (2003) Three-nucleon mechanisms in photoreactions. Physics Letters B, 553(1-2), 25 -30. (doi: 10.1016/S0370-2693(02)03186-6)

Abstract

The /sup 12/C( gamma , ppn) reaction has been measured for E/sub gamma /=150-800 MeV in the first study of this reaction in a target heavier than /sup 3/He. The experimental data are compared to a microscopic many body calculation. The model, which predicts that the largest contribution to the reaction arises from final state interactions following an initial pion production process, overestimates the measured cross sections and there are strong indications that the overestimate arises in this two-step process. The selection of suitable kinematic conditions strongly suppresses this two-step contribution leaving cross sections in which up to half the yield is predicted to arise from the absorption of the photon on three interacting nucleons and which agree with the model. The results indicate ( gamma ,3N) measurements on nuclei may be a valuable tool for obtaining information on the nuclear three-body interaction.

• Item Type: Articles
• Additional Information: Thomson UT: 180642200004
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Owens, Professor Robert and Kellie, Dr James and MacGregor, Professor Douglas and Annand, Dr John
• Authors: Watts, D.P., Ahrens, J., Annand, J.R.M., Beck, R., Branford, D., Grabmayr, P., Hehl, T., Kellie, J.D., MacGregor, I.J.D., McGeorge, J.C., and Owens, R.O.
• Subjects: Q Science > QC Physics
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Physics Letters B
• Publisher: Elsevier BV
• ISSN: 0370-2693
• ISSN (Online): 1873-2445