Bochum 2009 – scientific programme
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HK: Fachverband Hadronen und Kerne
HK 32: Few-body physics
HK 32.2: Talk
Tuesday, March 17, 2009, 14:30–14:45, H-ZO 100
Parity-violating effects in A=3, 4 systems — •Michele Viviani1, Rocco Schiavilla2, Alejandro Kievsky1, Luca Girlanda3, and Laura E. Marcucci3 — 1INFN, Sezione di Pisa, Pisa (Italy) — 2ODU, Norfolk and JLAB, Newport News (USA) — 3Phys. Dept., Pisa University, Pisa (Italy)
The parity-violating components of the nucleon-nucleon potential are studied in A=3,4 nucleon systems. In particular, we’ll report the calculation of i) the neutron spin rotation in n→-d scattering, and ii) the longitudinal spin asymmetry in the reaction n→+3He→ p+3H. The scattering wave functions are obtained by means of the Kohn variational principle and the hyperspherical harmonic method. The calculations are performed using a number of different, latest-generation strong-interaction two- and three-nucleon potentials and the DDH or the new effective field theory models for the weak-interaction potential. These observables are expected to be dominated by the contribution of the long-range part of the parity-violating potential associated with pion exchange. Thus their measurements could provide a further constraint, complementary to that coming from measurements of the photon asymmetry in n→−p radiative capture, on the strength of this component of the hadronic weak interaction.