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Probing isospin symmetry in the (⁵⁰Fe, ⁵⁰Mn, ⁵⁰Cr) isobaric triplet via electromagnetic transition rates

: Giles, Michael M.; Nara Singh, B.S.; Barber, Liam; Cullen, David M.; Mallaburn, M.J.; Beckers, Marcel; Blazhev, Andrey; Braunroth, Thomas; Dewald, Alfred; Fransen, Christoph; Goldkuhle, Alina; Jolie, Jan; Mammes, Franziska; Müller-Gatermann, Claus; Wölk, Dorothea; Zell, Karl Oskar; Lenzi, Silvia M.; Poves, Alfredo


Physical Review. C 99 (2019), Nr.4, Art. 044317, 7 S.
ISSN: 0556-2813
Fraunhofer INT ()

Lifetimes of the T = 1 isobaric analog Iπ = 2⁺ states in ⁵⁰Mn and ⁵⁰Cr were measured simultaneously by employing the recoil distance Doppler-shift (RDDS) technique. The states were populated in a fusion-evaporation reaction with a ¹²C beam on a ⁴⁰Ca target. An analysis of the data and the calculations from the present work, together with the available B(E2 : 2⁺ → 0⁺) data of the isobaric analog states in ⁵⁰Fe and ⁵⁰Cr, were used to study isospin symmetry in the three A = 50 isobaric nuclei. Shell-model calculations reproduce the magnitudes as well as the increasing trend of the B(E2) data with increasing Z. To draw a firm conclusion on the level of isospin mixing in the triplet, a new precision measurement of the 2⁺ → 0⁺ transition rate in ⁵⁰Fe will be required.