Abstract
Thirty-nine states, all except two of which are new, have been observed up to 1535 keV in191Os using the reactions190Os(d,p)191Os,192Os(d, t)191Os with 12 MeV deuterons and magnetic analysis with photographic emulsions of the outgoing particles, and190Os(n, γ)191Os with thermal neutrons and three modes of gamma detection in the energy range from 40 keV to ∼6 MeV. The neutron separation energy was determined as 5758.5±2.0 keV in agreement with the value of the (d, p) reaction. TheQ value for the (d, t) reaction was determined as −1265±15 keV. Spins and parities are assigned for most of the states below 800 keV. The states below 463 keV are shown to be qualitatively but not quantitatively consistent with the expectations of the Nilsson model. Nilsson systematics of the 1/2−: ¦510¦ and 3/2− ¦512¦ orbitals in odd-A Os isotopes with increasing neutron number can be understood in terms of decreasing deformation. Anomalously large (d, p) and (d, t) cross sections populating 5/2− and 3/2− states at 134 and 142 keV, respectively, are explained as a tendency to restore the cross sections expected for a spherical nucleus. Evidence for triaxiality in191Os is observed in the form of a 5/2− state at 273 keV which appears to be a rotational state built on the 9/2− ground state.
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Supported by the U.S. Energy Research and Development Administration
Alexander von Humboldt Senior Scientist Awardee at the KFA Jülich, 1976
We would like to thank Ken Chapman and the staff of the Florida State University Tandem Laboratory for their support in the (d, p) and (d, t) runs. Those who helped in operating the Tandem and the spectrograph are J.W. Dawson, J.L. Dubard, K.G. Ellson, H.D. Jones, R.G. Lanier, M.M. Minor, R.L. Mlekodaj, T.J. Mulligan, Y. Shida and R.C. Thompson. The spectrograph plates were meticulously scanned by Veronica Bryant Lanier, Mary Jones, Sue Hipps, Ella Jean Wehunt and Susan Chester Wozniak. We thank K.E. Chellis and Robert Leonard for the Os targets and Edward T. Jurney and the staff of the Los Alamos Omega West reactor for making the (n, γ) experiments possible. We are particularly grateful to Dr. N. Onishi for the theoretical calculations of the Nilsson levels in this paper. This paper was largely written at Jülich, West Germany. One of us (RKS) thanks Otto Schult for a careful reading of this paper and for his hospitality at Jülich, and Hellmut Hanle and the Alexander von Humboldt Foundation for financial support.
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Benson, D., Kleinheinz, P., Sheline, R.K. et al. Nuclear levels and spectroscopy of191Os. Z Physik A 281, 145–157 (1977). https://doi.org/10.1007/BF01408626
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DOI: https://doi.org/10.1007/BF01408626