Elsevier

Nuclear Physics A

Volume 232, Issue 2, 4 November 1974, Pages 287-310
Nuclear Physics A

The structure of 209Bi: (I). Microscopic structure from analog resonances

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Abstract

Excitation functions for the 209Bi(p, p′) reaction have been measured for incident proton energies from 14.0 to 15.5 MeV to study the population of states in 209Bi via decay of the isobaric analog resonances in the compound nucleus 210Po. The analogs correspond to parent states in the lowest one MeV of excitation in 210Bi. Strong resonances are observed in the excitation functions for twenty proton groups corresponding to levels between 2.75 and 3.65 MeV in 209Bi. From these results, levels which possess microscopic 2p-1h structure involving the h92π, g92ν and p12−1ν orbitals are identified and their 210Bi parentage determined. The resonant scattering results together with other direct inelastic scattering data allow the spins and parities for many of the levels to be deduced. The results of a microscopic calculation, in which empirical two-body matrix elements are employed to describe the interactions between the h92π, g92ν and p12−1ν orbitals, are also reported and compared with the experimental results for levels in 209Bi. The excellent agreement between theory and experiment demonstrates that the general character of these levels can be understood microscopically in terms of their 2p-1h structure.

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    Work supported by USAEC Contract AT(11-1)-3074.

    ††

    Present address: Department of Physics, University of Wisconsin, Madison, Wisconsin, 53706.

    Present address: Los Alamos Scientific Laboratory, Los Alamos, New Mexico, 87544.

    ‡‡

    NATO Fellow. Present address: Instituto di Fisica, University of Florence, Italy.

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