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Measurement of double-polarization asymmetries in the quasi-elastic ³vec{He}(vec{e},e'p) process

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arxiv 1804.06043 v1 pith:7UATRRBD submitted 2018-04-17 nucl-ex

Measurement of double-polarization asymmetries in the quasi-elastic ³vec{He}(vec{e},e'p) process

classification nucl-ex
keywords mathrmasymmetriesbreakupthree-bodydouble-polarizationmeasurementprocessquasi-elastic
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We report on a precise measurement of double-polarization asymmetries in electron-induced breakup of $^3\mathrm{He}$ proceeding to $\mathrm{pd}$ and $\mathrm{ppn}$ final states, performed in quasi-elastic kinematics at $Q^2 = 0.25\,(\mathrm{GeV}/c)^2$ for missing momenta up to $250\,\mathrm{MeV}/c$. These observables represent highly sensitive tools to investigate the electromagnetic and spin structure of $^3\mathrm{He}$ and the relative importance of two- and three-body effects involved in the breakup reaction dynamics. The measured asymmetries cannot be satisfactorily reproduced by state-of-the-art calculations of $^3\mathrm{He}$ unless their three-body segment is adjusted, indicating that the spin-dependent part of the nuclear interaction governing the three-body breakup process is much smaller than previously thought.

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