Electro-pion production from proton, deuteron, and helium-3

The cross section for the p(e,e\sp\primeπ\sp+)n, d(e,e\sp\primeπ\sp+)2n and \sp3He(e,e\sp\primeπ\sp+)\sp3H reactions are calculated using a simple model with pion, nucleon and $\Delta$-resonance degrees of freedom for the kinematical conditions used in a recent Saclay experiment. For the d(e,e\sp\primeπ\sp+)2n reaction, final state interactions between the two outgoing neutrons are found to have a large effect. The calculated quenching of the π\sp+ production cross section for the deuterium target is in agreement with that observed experimentally. It is predicted that due to the strong final state interactions in the singlet S state of the two neutrons, the d(e,e\sp\primeπ\sp+)2n cross section can have a large dependence on the orientation of the deuteron spin. For the \sp3He(e,e\sp\primeπ\sp+)\sp3H reaction, the quenching is predicted to be $\sim$0.4 which is in agreement with the unpublished results of the Mainz experiment. The four important contributions to the quenching are identified as: (i) the finite size i.e., the form factor of the trinucleons, (ii) the spin-isospin correlations in the trinucleons, (iii) the finite range of the propagation of the struck proton, and (iv) the possible pion-nucleon final state interactions.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Physics

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2011

Author dc:creator

• Loucks, Roger

Contributors dc:contributor

• Pandharipande, V.R.

• Physics, Nuclear

Statement dc:rights

• Copyright 1996 Loucks, Roger Jay

Language dc:language

eng

Identifier

9780591199277
AAI9712362
(UMI)AAI9712362

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/22287