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As simple as ABC - the dd → α X reaction explained
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Nuclear and Particle Physics.
2000 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

A model is presented for the dd → αππ reaction. It is based on two parallell and almost independent NN processes, where the final deutrons fuse to form the α particle. While underestimating the results at lower energies, the modelgives a good quantitative description of the α-particle momentum distributions throughout the 0.8 < Td < 1.9 GeV energy range. In particular it reproduces the remarkable peak structure (the ABC effect) that dominates the spectra at these energies. The predictions of deuteron vector and tensor analyzing powers are also in good agreement with data, both in frequency and magnitude of the oscillations.

By considering two npdππ processes instead of NNdπ, the model is extended to four-pion production. With a simple parameterization of the npdππ amplitude, the high missing mass part of the dd → αX spectra at Td1.9 GeV could be fairly well reproduced.

The model is also applied to dd → αγγ, using two npdγ processes. This reaction is important as background to the charge-symmetry-breaking reaction dd → απ0. The calculated two-photon contribution is of the same magnitude as a reported π0 signal, taking the experimental resolution into account. New experiments are needed in order to clarify the situation.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis , 2000. , vii, [1], 64 p.
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 521
Keyword [en]
Radiation sciences
Keyword [sv]
National Category
Radiology, Nuclear Medicine and Medical Imaging
Research subject
Nuclear Physics
URN: urn:nbn:se:uu:diva-1241ISBN: 91-554-4684-1OAI: oai:DiVA.org:uu-1241DiVA: diva2:160801
Public defence
2000-04-28, Siegbahnsalen, Department of Physics, Uppsala University, Uppsala, 13:15
Available from: 2000-04-07 Created: 2000-04-07Bibliographically approved

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