Excited states in 46Cr were sought using the 12C(36Ar,2n) reaction. Gamma rays were detected with the Gammasphere array, and the Z value of the reaction products was determined with an ionization chamber located at the focal plane of the Fragment Mass Analyzer. In addition to the ground-state band observed up to Iπ=10+ (tentatively 12+), five states are proposed to belong to the 3- band. The mirror energy differences with the analog states in 46Ti present a pronounced staggering effect between the odd and even spin members that is reproduced well by shell-model calculations incorporating the different Coulomb contributions, monopole, multipole, and single-particle effects together with an isospin-nonconserving interaction that accounts for the so-called J=2 anomaly. Dramatically different E1 decay patterns for members of the 3- band between the 46Cr and 46Ti mirrors are also observed.
Spectroscopy of the N = Z - 2 nucleus 46Cr and mirror energy differences
LENZI, SILVIA MONICA;
2007
Abstract
Excited states in 46Cr were sought using the 12C(36Ar,2n) reaction. Gamma rays were detected with the Gammasphere array, and the Z value of the reaction products was determined with an ionization chamber located at the focal plane of the Fragment Mass Analyzer. In addition to the ground-state band observed up to Iπ=10+ (tentatively 12+), five states are proposed to belong to the 3- band. The mirror energy differences with the analog states in 46Ti present a pronounced staggering effect between the odd and even spin members that is reproduced well by shell-model calculations incorporating the different Coulomb contributions, monopole, multipole, and single-particle effects together with an isospin-nonconserving interaction that accounts for the so-called J=2 anomaly. Dramatically different E1 decay patterns for members of the 3- band between the 46Cr and 46Ti mirrors are also observed.
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