Polarization transfer invariants at 0° in nuclear reactions

Physics

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Transfer Reactions, Charge-Exchange Reactions, Polarization Phenomena In Reactions, Spin, Parity, And Isobaric Spin, Nuclear Reaction Models And Methods

Scientific paper

Polarization transfer measurements at forward angles have been used to detect and extract strengths of spin-dependent excitations in nuclei. It was recently demonstrated experimentally and proved theoretically that a rotationally invariant quantity constructed from the polarization transfer coefficients for nucleon-nucleus scattering takes a unique value at 0° for unnatural parity transitions. For natural parity transitions the value of the invariant provides a measure of the spin-flip mixture in the transition. The present contribution extends the above result to general inclusive nuclear reactions A(a,b)B with arbitrary projectile/ejectile spins and target excitations. The result gives a relation between the set of invariant values and that of the target spin-flip transition strengths. .

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