Spectroscopy of 50Sc and ab initio calculations of B(M3) strengths

A.B. Garnsworthy*, M. Bowry, B. Olaizola, J.D. Holt, S.R. Stroberg, S. Cruz, S. Georges, G. Hackman, A.D. Maclean, J. Measures, H.P. Patel, C.J. Pearson, C.E. Svensson

*Corresponding author for this work

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Abstract

The GRIFFIN spectrometer at TRIUMF-ISAC has been used to study excited states and transitions in 50Sc following the β decay of 50Ca. Branching ratios were determined from the measured γ-ray intensities, and angular correlations of γ rays have been used to firmly assign the spins of excited states. The presence of an isomeric state that decays by an M3 transition with a B(M3) strength of 13.6(7) W.u. has been confirmed. We compare the first ab initio calculations of B(M3) strengths in light- and medium-mass nuclei from the valence-space in-medium similarity renormalization group approach, using consistently derived effective Hamiltonians and effective M3 operator. The experimental data are well reproduced for isoscalar M3 transitions when using bare g factors, but the strength of isovector M3 transitions are found to be underestimated by an order of magnitude.
Original languageEnglish
Article number044329
JournalPhysical Review C
Volume96
Issue number4
DOIs
Publication statusPublished - 26 Oct 2017
Externally publishedYes

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