Analog E1 transitions and isospin mixing

N. S. Pattabiraman, D. G. Jenkins, M. A. Bentley, R. Wadsworth, C. J. Lister, M. P. Carpenter, R. V. F. Janssens, T. L. Khoo, T. Lauritsen, D. Seweryniak, S. Zhu, G. Lotay, P. J. Woods, Missing Krishichayan, P. Van Isacker

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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 S-31 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.

Original languageEnglish
Article number024301
Pages (from-to)-
Number of pages8
JournalPhysical Review C
Issue number2
Publication statusPublished - 6 Aug 2008


  • P-31

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