Magnetic dipole strength in 46Ca observed with 180° electron scattering

Abstract Results are presented from a search for M1 strength in 46 Ca by means of 180° electron scattering at low momentum transfer. We report the presence of a 1 + state at 13.02±0.04 MeV with a reduced electromagnetic transition strength, B (M1)=2.47±0.77 μ 2 N . The excitation energy of this level is ∼2 MeV higher than strong 1 + states seen in other even-even calcium isotopes. No evidence was seen for M1 strength in the 10 MeV excitation energy region where strength is predicted by shell model calculations.