Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 74: Fundamental Symmetries

HK 74.2: Talk

Thursday, March 19, 2009, 17:00–17:15, H-ZO 70

Unexpected asymmetry in B(E1) strengths of mirror nuclei ⁶⁷As and ⁶⁷Se — •Riccardo Orlandi^1,2, Giacomo de Angelis¹, and Pier Giorgio Bizzeti³ — ¹Laboratori Nazionali di Legnaro, Legnaro, Italy — ²The University of the West of Scotland, Paisley, United Kingdom — ³INFN Sezione di Firenze and Universita’ di Firenze, Italy

Discrepancies revealed in a recent measurement of the E1 transition rates of mirror transitions in ₃₃⁶⁷As₃₄ and ₃₄⁶⁷Se₃₃ can be interpreted to indicate a large isoscalar component in the reduced E1 transition strengths. Neither the explicit inclusion of higher order terms in the transition operator, nor the the mixing with close-lying levels suffice to yield an effect of comparable size. On the other hand, coherent contributions with higher-lying states, via the Isovector Giant Monopole Resonance (IVGMR), would induce an isoscalar term sufficiently large to account for the asymmetries observed in the experiment.