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Precision measurement of the E2 transition strength to the 2^+₁ state of ¹²C

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arxiv 2005.04072 v2 pith:2XX4RXX7 submitted 2020-05-08 nucl-ex nucl-th

Precision measurement of the E2 transition strength to the 2^+₁ state of ¹²C

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keywords strengthfactorformresultsstatetransitionaccuracyanalysis
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The form factor of the electromagnetic excitation of $^{12}$C 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 $B(E2; 2^+_1\rightarrow 0^+_1) =7.63(19)$ e$^2$fm$^4$ 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 $Q(2^+_1) = 5.97(30)$ efm$^2$ can be extracted from the strict correlation with the $B((E2)$ strength emerging in the calculations.

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