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High-Resolution Inelastic Electron Scattering and the Isoscalar Nature of the M 1 Transitions to the J π = 1 <…

1985; American Physical Society; Volume: 54; Issue: 4 Linguagem: Inglês

10.1103/physrevlett.54.293

1092-0145

S. Müller, G. Küchler, A. Richter, H. P. Blok, H. P. Blok, C. W. de Jager, H. de Vries, J. Wambach,

Quantum Chromodynamics and Particle Interactions

The relative weight of proton and neutron spin-flip contributions to the $M1$ excitation of the recently discovered ${J}^{\ensuremath{\pi}}={1}^{+}$ state at ${E}_{x}=5.846$ MeV has been determined by comparison of the momentum-transfer dependence of the measured electron-scattering form factor (${q}_{\mathrm{eff}}=0.44\ensuremath{-}1.59$ ${\mathrm{fm}}^{\ensuremath{-}1}$) to results from a simple two-state model and from random-phase-approximation calculations using a spin- and spin-isospin-dependent effective separable interaction. The $M1$ transition is shown to be predominantly of isoscalar nature.