Elsevier

Physics Letters B

Volume 349, Issue 4, 27 April 1995, Pages 433-437
Physics Letters B

Isospin mixing in the electroexcitation of the Ex = 10.84 MeV, Jπ; T = 1; 0 state in 12C at low momentum transfers

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Abstract

Electroexcitation of the isospin-forbidden transition to the broad Jπ; T = 1; 0 state at 10.84 MeV in 12C has been studied for momentum transfers q < 0.6 fm−1. The longitudinal form factor exhibits a sensitivity to the interference of small T = 1 admixtures. The isospin breaking Coulomb matrix element is determined in a two-state model to 〈HC〉 = 145(80) keV. A shell-model calculation using a new effective psd-shell interaction qualitatively agrees with the shape of the form factor but underpredicts its magnitude by a factor of about two.

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    Work supported by the German Federal Minister for Research and Technology (BMFT) under contract number 06 DA 665 I and by the NSF grant 94-03666.

    1

    On leave from Instituto de Estudos Avançados CTA, São Paulo, Brazil.

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