Precision measurement of the E2 transition strength to the 2+1 state of 12C
Abstract
The form factor of the electromagnetic excitation of 12C to its 2+1 state was measured at extremely low momentum transfers in an electron scattering experiment at the S-DALINAC. A combined analysis with the world form factor data results in a reduced transition strength B(E2; 2+1→ 0+1) =7.63(19) e2fm4 with an accuracy improved to 2.5\%. In-Medium-No Core Shell Model results with interactions derived from chiral effective field theory are capable to reproduce the result. A quadrupole moment Q(2+1) = 5.97(30) efm2 can be extracted from the strict correlation with the B((E2) strength emerging in the calculations.
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