Angular distributions for knockout and scattering of protons in the eikonal approximation
- Dipartimento di Chimica e Fisica per i Materiali, Universita di Brescia, Brescia, (Italy) I-25133
- Istituto Nazionale di Fisica Nucleare, Sezione di Pavia, Pavia, (Italy) I-27100
The advent of new electron accelerators with few-GeV beam energies makes the ({ital e},{ital e}{sup {prime}}{ital p}) reaction a promising tool for investigating new aspects of the electromagnetic interaction. To this purpose it is crucial to set the scale of final-state interactions (FSI) at high ejectile energies. Usually, the problem is faced by mutuating well-established results of the Glauber method in the framework of elastic ({ital p},{ital p}) scattering. Since the generalization of this eikonal approximation to the ({ital e},{ital e}{sup {prime}}{ital p}) case is not straightforward, we have analyzed the constraints which make the comparison a meaningful one, using the {sup 12}C({ital e},{ital e}{sup {prime}}{ital p}){sup 11}B{sub {ital s}1/2} and {sup 11}B{sub {ital s}1/2}({ital p},{ital p}) reactions with outgoing-proton momenta of 4 GeV/{ital c} as a test case. The FSI dominance at large deflection angles produces in the distributions a universal behavior resembling the coherent diffractive scattering between the ejected proton and the (residual) nucleus. Because of the selected sensitivity of the ({ital e},{ital e}{sup {prime}}{ital p}) distribution to different theoretical ingredients depending on different values of the deflection angle (or transverse missing momentum), it is argued that the previous comparison with elastic proton scattering may represent a convenient tool to disentangle effects due to the (hard) electromagnetic vertex from (exotic) effects related to the propagation of the struck hadron through the nuclear medium. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 401150
- Journal Information:
- Physical Review, C, Journal Name: Physical Review, C Journal Issue: 6 Vol. 54; ISSN PRVCAN; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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