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Analog E1 transitions and isospin mixing

Abstract : We investigate whether isospin mixing can be determined in a model-independent way from the relative strength of E1 transitions in mirror nuclei. The specific examples considered are the A=31 and A=35 mirror pairs, where a serious discrepancy between the strengths of 7/2--->5/2+ transitions in the respective mirror nuclei has been observed. A theoretical analysis of the problem suggests that it ought to be possible to disentangle the isospin mixing in the initial and final states given sufficient information on experimental matrix elements. With this in mind, we obtain a lifetime for the relevant 7/2- state in 31S using the Doppler-shift attenuation method. We then collate the available information on matrix elements to examine the level of isospin mixing for both A=31 and A=35 mirror pairs.
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Contributor : Michel Lion <>
Submitted on : Wednesday, August 13, 2008 - 1:22:46 PM
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N.S. Pattabiraman, D.G. Jenkins, M.A. Bentley, R. Wadsworth, C.J. Lister, et al.. Analog E1 transitions and isospin mixing. Physical Review C, American Physical Society, 2008, 78, pp.024301. ⟨10.1103/PhysRevC.78.024301⟩. ⟨in2p3-00311168⟩



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