Polarization transfer in 4He(e,e'p)3H: is the ratio GEp/GMp modified in medium ?
Polarization observables in the {sup 4}He({rvec e}, e{prime} {rvec p}){sup 3}H reaction are calculated using accurate three- and four-nucleon bound-state wave functions, a realistic model for the nuclear electromagnetic current operator, and a treatment of final-state-interactions with an optical potential model constrained by p {sup 3}H elastic and charge-exchange cross section data. In contrast to earlier studies, no significant discrepancies are found between theory and experiment both for the ratio of transverse to longitudinal polarization transfers and for the induced polarization, when free-nucleon electromagnetic form factors are used in the current operator. The present results challenge the current interpretation of the experimental data in terms of medium-modified form factors.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 834829
- Report Number(s):
- JLAB-05-04-307; DOE/ER/40150/2996; TRN: US0407320
- Resource Relation:
- Other Information: No journal information given for this preprint; PBD: 1 Dec 2004
- Country of Publication:
- United States
- Language:
- English
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