Abstract
The nuclide141Eu is identified to have two beta decaying isomers,141gEu and141mEu, whose decay half-lives are measured to be 40.0±0.7 s and 3.3±0.3s, respectively. Their decay properties are studied by means of beta and gamma spectroscopy techniques. The states withJ π assignments in141Sm thus deduced are compared with those of the other odd-A, N=79 isotones. The total decay energy of141gEu is measured to be 6.03±0.10 MeV, which is compared with the predictions of several mass formulae and with the decay energy systematics of theN=78 isotones. The141gEu and141mEu are deduced to haveJ π =5/2+ and 11/2−, respectively. A 96.4 keV isomeric transition between them is found to be anE3 transition with aB(E3)=1.6±0.4e2fm6. The structure of141Eu is compared with that of the otherN = 78 isotones.
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