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Lifetimes of the states in the quadrupole structure in 143Eu have beenmeasured using the Doppler shift attenuation method as well as parity of thestates in the sequence has been firmly identified from polarization measurementusing the Indian National Gamma Array. The decreasing trends of the deducedquadrupole transition strength B(E2) with spin, along with increasing J (2)/B(E2) values before band crossing, conclusively establish the origin of thesestates as arising out of antimagnetic rotation. The abrupt increase in theB(E2) values after the band crossing in the quadrupole band, a novel featureobserved in the present experiment, may indicates the crossing of differentshears configurations resulting in re-opening of shears structure. The resultsare well reproduced by numerical calculation within the framework ofsemi-classical geometric model.

Antimagnetic rotation and sudden change of electric quadrupole transition strength in 143Eu