Contrasting high-spin yrast bands in 172Os and 174Os and an unexpected low-frequency anomaly in 172Os |
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Authors: | JL Durell GD Dracoulis C Fahlander AP Byrne |
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Institution: | Department of Nuclear Physics, Research School of Physical Sciences, Australian National University, P.O. Box 4, Canberra, A.C.T. 2600, Australia |
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Abstract: | The yrast bands of the neutron deficient isotopes 172Os and 174Os have been identified to spins of about 24. The yrast band in 174Os shows no bandcrossing anomalies, confirming the shell effect observed in other N = 98 nuclei. In contrast, a strong backbend observed at a frequency of about 0.26 MeV in 172Os is attributed to the s-band crossing. A weaker band-crossing is also observed at a lower frequency, about 0.24 MeV, in 172Os. This unexpected anomaly may be due to either a deformation effect, or to a change in the s-band structure. |
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