Core polarization and 5/2+ states in91Nb |
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Authors: | S Shelly R K Bansal |
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Institution: | 1. Department of Physics, Panjab University, Chandigarh, India
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Abstract: | The energies and spectroscopic factors ofJ π=5/2+ states of nucleus91Nb excited via a reaction transferring a proton to the 2d 5/2 orbit of90Zr target state have been calculated. Effective two-body interaction used has been extracted from the experimentally observed two-body energies of (1g 9 2/?1 (n) 2d 5/2(n)), (1g 9 2/?1 (n) 1g 9/2(p)) and (1g 9/2(p)-2d 9/2(n)) multiplets in90Zr,90Nb and92Nb nuclei respectively. Most of the calculated energies and the strengths ofJ π=5/2+ levels have reasonably good counterparts in the experimental spectrum, however the calculation shows about 17% strength lying at 6.8 MeV, without having a confirmed counterpart in the observed level scheme. The reduced transition strengthsB(M1) forM l transitions from 5/2? T>(11/2) state to the various components of 5/2+ T<(=9/2) state have also been reported; but the corresponding experimental values are not available. The main feature of the reduced transition strengths is that theM1 transition to the state at 3.69 MeV is inhibited whereas that to the state at 6.79 MeV is enhanced, the relevant core-configuration, interfering destructively in the former case and constructively in the latter. |
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