Probing structural changes in the very neutron-deficient Os isotopes with recoil-decay tagging

Joss, D.T., Amzal, N., Appelbe, D.E., Back, T., Bentley, M.A., Cederwall, B., Cocks, J.F.C., Cullen, D.M., Eeckhaudt, S., Grahn, T., Greenlees, P.T., Hadinia, B., Helariutta, K., Jones, P.M., Julin, R., Juutinen, S., Kankaanpaa, H., Keenan, A., Kettunan, H., King, S.L., Kuusiniemi, P., Lagergren, K., Leino, M., Leppanen, A.P., Muikku, M., Nieminen, P., Page, R.D., Pakarinen, J., Paul, E.S., Rahkila, P., Scholey, C., Savelius, A., Simpson, J., Taylor, M.J., Uusitalo, J., Williams, S.J., Warner, D.D., Wiseman, D.R. and Wyss, R. (2005) Probing structural changes in the very neutron-deficient Os isotopes with recoil-decay tagging. Journal of Physics G: Nuclear and Particle Physics, 31 (10), S1593-S1598. (doi:10.1088/0954-3899/31/10/039).

Abstract

In recent years, the exploitation of the recoil-decay tagging (RDT) technique with large arrays of germanium detectors has revealed much information about the structure of heavy nuclei approaching the proton drip line. The yrast bands of the N ? 93 osmium isotopes have been identified in a campaign of tagging experiments using various spectrometer arrays coupled to the RITU gas-filled separator based at the University of Jyväskylä. Trends in the yrast state excitation energies have indicated a transition from ?-soft triaxial to near-spherical shapes with decreasing neutron number. Recent experimental results for 162Os obtained with the JUROGAM and GREAT spectrometers also indicate the importance of configurations involving the h9/2 neutron states as the N = Z = 82 shell gaps are approached.

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