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- W2040062322 abstract "The excitation of the J π ;T=1 + ;0 and 1 + ;1 states at E x =12.71 and 15.11 MeV in 12 C has been studied at momentum transfers q<0.5 fm −1 in inelastic electron scattering. The corresponding ground state radiation widths and transition radii for the isoscalar and isovector transition are deduced as Γ γ 0 =0.32(2) eV, R tr =2.95(9) fm and Γ γ 0 =35.9(6) eV, R tr =2.63(4) fm, respectively. For the evaluation of Γ γ 0 and R tr for the transition to the 15.11 state (e,e ′ ), data of the present work have been combined with older data from other low energy electron accelerators. The results support the strong isospin mixing of the two 1 + states, and in the frame of a two-state model a Coulomb matrix element 〈H C 〉=118(8) keV is derived. This value agrees with other experiments using electromagnetic or pionic probes but is much more accurate. Furthermore, the measured difference in the transition radii for the isoscalar and isovector transitions allows for the first time a unique determination of the sign of 〈H C 〉 ." @default.
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- W2040062322 date "2000-04-01" @default.
- W2040062322 modified "2023-10-02" @default.
- W2040062322 title "Electroexcitation of isoscalar and isovector magnetic dipole transitions in C and isospin mixing" @default.
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- W2040062322 doi "https://doi.org/10.1016/s0375-9474(99)00564-3" @default.
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