Abstract
Levels in the ,194,196,198,200Pb isotopes were studied via the /electron-capture decay of mass separated Bi isotopes. Multiscaled spectra of γ rays, x rays, and conversion electrons, and γ-γ and γ- coincidences were measured. The existence of states in the nuclei is shown and evidence for the beginning of a collective band built on top of the states is seen in ,194,196Pb. A discussion in terms of characteristic properties of intruder states in the even-even nuclei and in terms of a one-broken-neutron-pair formalism is given. This shows clearly the presence of both neutron and proton [π(2p-2h)] based states in the semimagic Pb nuclei at low excitation energy.
- Received 3 October 1986
DOI:https://doi.org/10.1103/PhysRevC.35.1861
©1987 American Physical Society