| Autor: |
C. Schlegel, V. Yu. Ponomarev, D. G. Richmond, Achim Richter, R. Schulz, T. W. Sinor, Carl B. Collins, K. N. Taylor, James Carroll, M. Huber, P. von Neumann-Cosel |
| Rok vydání: |
1993 |
| Předmět: |
|
| Zdroj: |
Nuclear Physics A. 559:253-265 |
| ISSN: |
0375-9474 |
| DOI: |
10.1016/0375-9474(93)90190-9 |
| Popis: |
Resonant photon scattering off 89Y was investigated in a measurement of the 89Ym excitation function for bremsstrahlung endpoint energies E0 = 2−5 MeV and in a nuclear-resonance-fluorescence experiment with E0 = 5 MeV. The results are compared to a quasiparticle-phonon model calculation. Besides a well-known single-particle M1 transition at low energies, the photoexcitation spectrum is governed by transitions to states built by coupling of the dominant p 1 2 hole ground-state configuration to collective quadrupole phonons in the neighbouring 90Zr. The detailed decay cascade to the isomer reproduces the experimental finding of only two intermediate states with about equal strength and explains the suppression of other possible transitions due to the nature of the particular E1 matrix element. The theoretical isomer branching ratios are small compared to the experiment, but depend critically on details of the model. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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