Polarization Transfer in the Reaction ⁴He($$\vec{v}$$,e'$$\vec{p}$$)³H in the Quasielastic Scattering Region

Thesis/Dissertation · Wed May 01 04:00:00 EDT 2002

DOI:https://doi.org/10.2172/824897· OSTI ID:824897

Dieterich, Sonja ^[1]

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1. Rutgers Univ., New Brunswick, NJ (United States)

There has been a longstanding issue concerning possible nucleon modifications in a (dense) nuclear medium. Polarization transfer data for exclusive quasielastic electron scattering are a sensitive to the ratio of the electric and magnetic nucleon form factors in the medium. Although proper interpretation of the results requires accounting for such effects as final state interactions and meson exchange currents, their effect on polarization transfer is predicted to be small. Studies of model dependencies, e.g., the off-shell current operator and spinor distortions, have been done. Final results of a measurement of polarization transfer in the ⁴He($$\vec{v}$$,e'$$\vec{p}$$)³H reaction will be discussed. The experiments were carried out at MAMI, Mainz at a Q² of 0.4 GeV² and at the Thomas Jefferson Lab, Newport News, Virginia at the Q² values 0.5, 1.0, 1.6 and 2.6 GeV². Measured values of the transferred and induced polarization are compared with various theoretical calculations. The experiment showed a difference between the fully relativistic model with may indicate medium modifications of the form factor.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Energy Research (ER)
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 824897
• Report Number(s): JLAB-PHY--03-187; DOE/ER/40150--2748
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
HELIUM 4
POLARIZATION
QUASI-ELASTIC SCATTERING
TRITIUM