Study of the N = 77 odd-Z isotones near the proton-drip line.

Authors :: Gross, Carl J.
Nazarewicz, Witold
Rykaczewski, Krzysztof P.
Tantawy, M. N.
Bingham, C. R.
Mazzocchi, C.
Grzywacz, R.
Królas, W.
Rykaczewski, K. P.
Batchelder, J. C.
Gross, C. J.
Fong, D.
Hamilton, J. H.
Hartley, D. J.
Hwang, J. K.
Larochelle, Y.
Piechaczek, A.
Ramayya, A. V.
Shapira, D.
Winger, J. A.
Source :: 4th International Conference on Exotic Nuclei & Atomic Masses; 2005, p151-153, 3p
Publication Year :: 2005
Abstract: The evolution of the πh11/2vh11/2 and πh11/2vs1/2 isomeric configurations was studied for the N = 77 isotones near the proton drip line. The decays of metastable levels in 140Eu, 142Tb, and 144Ho were measured by means of X-, gamma- and conversion electron spectroscopy at the Recoil Mass Spectrometer at Oak Ridge. The sequence of isomeric levels in 140Eu was experimentally determined. The half-life of the πh11/2vh11/2 state in 142Tb was remeasured to be 25(1) µs. The spins and parities of 5− and 8+ for the πh11/2vs1/2 and πh11/2vh11/2142Tb isomers, respectively, were established from measured multipolarities. No evidence for the expected 1+ ground state was found in the 144Ho decay data. [ABSTRACT FROM AUTHOR]