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Effects of Pairing Correlations on the Isospin-Symmetry Correction to Super-Allowed 0+ → 0+ Fermi Transitions Within the Higher Tamm-Dancoff Approach

Abstract : Super-allowed 0+ → 0+ Fermi transitions provide a test at low energy of the Standard Model of elementary interactions. The isospin-symmetry breaking due to the electromagnetic interaction at a nuclear level is a fundamental theoretical tool for the understanding of weak processes beyond the Standard Model. Within the Higher Tamm-Dancoff description of correlated nuclear states, we calculate the isospin-symmetry breaking correction δc to the Fermi transition matrix element. A sensitivity study on the T = 0 pairing correlations is carried out and some tests of model ingredients are performed. The obtained correction is of the order of 0.15~0.2% for plausible strengths in the T = 1 and T = 0 channels of the residual interaction. This is expected to constitute a lower bound.
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http://hal.in2p3.fr/in2p3-00605513
Contributor : Virginie Mas <>
Submitted on : Friday, July 1, 2011 - 9:59:38 PM
Last modification on : Friday, June 5, 2020 - 10:52:05 AM

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J. Le Bloas, L. Bonneau, P. Quentin, J. Bartel. Effects of Pairing Correlations on the Isospin-Symmetry Correction to Super-Allowed 0+ → 0+ Fermi Transitions Within the Higher Tamm-Dancoff Approach. International Journal of Modern Physics E, World Scientific Publishing, 2011, 20, pp.274-280. ⟨10.1142/S0218301311017624⟩. ⟨in2p3-00605513⟩

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