Abstract
High spin states in81Y up to the probable 33/2+ and 29/2− yrast states have been measured via the reaction58Ni(28Si,αp, using the Cologne tandem accelerator. Directional correlations of oriented nuclei were determined and the level scheme was extended with lifetimes measured by means of DSA and recoil distance techniques. Reduced transition strengths inferred from lifetimes were consistent with the results of Hartree-Fock-Bogolyubov calculations, which predict a nearly axially symmetric deformation ofβ 2≈0.37 for theπ=+ band. Predictions reveal an alignment driving the system to a smaller and triaxial deformation withβ 2=0.23 andγ=−30°, although the data show this crossing to be somewhat delayed. Particle-rotor calculations for the one-quasiparticle bands corroborate the predictions of deformation parameters based on the cranking model.
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Lühmann, L., Lieb, K.P., Lister, C.J., Varley, B.J., Olness, J.W., Price, H.G.: Europhys. Lett.1, 623 (1986)
Gross, C.J., Heese, J., Lieb, K.P., Ulbig, S., Nazarewicz, W., Varley, B.J., Billowes, J., Chishti, A.A., McNeill, J.H., Gelletly, W.: Nucl. Phys. A501, 367 (1989)
Nazarewicz, W., Warner, T.: In: Nuclear structure of the zirconium region. Eberth, J., Mayer, R.A., Sistemich, K. (eds.), p. 277. Berlin, Heidelberg, New York: Springer 1988
Cristancho, F., Gross, C.J., Lieb, K.P., Rudolph, D., Skeppstedt, Ö., Bentley, M.A., Gelletly, W., Price, H.G., Simpson, J., Durell, J.L., Varley, B.J., Rastikerdar, S.: Nucl. Phys. A540, 307 (1992)
Tabor, S.L.: Phys. Rev. C34, 311 (1986)
Diller, R., Lieb, K.P., Lühmann, L., Osipowicz, T., Sona, P., Wörmann, B., Cleeman, L., Eberth, J.: Z. Phys. A321, 659 (1985)
Cristancho, F., Lieb, K.P., Heese, J., Fieber, W., Osipowicz, T., Ulbig, S., Bharuth-Ram, K., Skoda, S., Eberth, J., Dewald, A., von Brentano, P.: Nucl. Phys. A501, 118 (1989)
Johnson, T.D., Cristancho, F., Gross, C.J., Kabadiyski, M., Lieb, K.P., Rudolph, D., Weiszflog, M., Burkardt, T., Eberth, J., Skoda, S.: Z. Phys. A347, 285 (1994)
Lister, C.J., Haustein, P.E., Alburger, D.E., Olness, J.W.: Phys. Rev. C24, 260 (1981)
Lister, C.J., Moscrop, R., Varley, B.J., Price, H.G., Warburton, E.K., Becker, J.A.: J. Phys. G11, 969 (1985)
Raguse, A., Gross, C.J., Kabadiyski, M.K., Lieb, K.P., Rudolph, D., Weiszflog, M., Burkardt, T., Skoda, S., Skeppstedt, Ö., Bentley, M.A., Gelletly, W., Price, H.G., Simpson, J., Durell, J.L., Varley, B.J.: High Spin Structure of81Y. Proceedings of the 8th International Symposium on CAPTURE GAMMA-RAY SPECTROSCOPY and related topics. Fribourg 1993. Kern, J. (eds.), p. 444. Singapore: World Scientific 1994
Mitarai, S., Kuroyanagi, T., Odhara, A., Mukai, J., Tomura, H., Suematsu, S., Morikawa, T., Jerrestam, D., Nyberg, J., Sletten, G., Atac, A., Piiparinen, M., Arnell, S.E., Foltescu, D., Roth, H.A., Skeppstedt, Ö.: Nucl. Phys. A557, c381 (1993)
Hellmeister, H.P., Lühmann, L.: Program GNOMON, Göttingen 1983 (unpublished)
Cristancho, F., Lieb, K.P.: Nucl. Phys. A486, 353 (1988)
Ziegler, J.F., Biersack, J.P., Littmark, V.: In: The stopping and range of ions in solids. New York: Pergamon 1985
Kalbitzer, S., Oetzmann, H.: Proc. Int. Conf. on ion beam modifications of materials. Budapest 1978 (unpublished)
Blaugrund, A.E.: Nucl. Phys.88, 501 (1966)
Gross, C.J., Baktash, C., Cullen, D.M., Cunningham, R.A., Garett, J.D., Gelletly, W., Hannachi, F., Harder, A., Kabadiyski, M.K., Lieb, K.P., Lister, C.J., Nazarewicz, W., Roth, H.A., Rudolph, D., Sarantites, D., Sheikh, J.A., Simpson, J., Skeppstedt, Ö., Varley, B.J., Warner, D.D.: Phys. Rev. C49, R580 (1994)
Skeppstedt, Ö., Lister, C.J., Chishti, A.A., Varley, B.J., Gelletly, W., Lenz, U., Moscrop, R., Goettig, L.: Nucl. Phys. A389, 424 (1982)
Lühmann, L., Debray, M., Lieb, K.P., Nazarewicz, W., Wörmann, B., Eberth, J., Heck, T.: Phys. Rev. C31, 828 (1985)
Holcomb, J.W., Döring, J., Glasmacher, T., Johns, G.D., Johnson, T.D., Riley, M.A., Womble, P.C., Tabor, S.L.: Phys. Rev. C48, 1020 (1993)
Nazarewicz, W., Dudek, J., Bengtsson, R., Bengtsson, T., Ragnarsson, I.: Nucl. Phys. A435, 397 (1985)
Moore, E.F., Cottle, P.D., Gross, C.J., Headly, D.M., Hüttmeier, U.J., Tabor, S.L., Nazarewicz, W.: Phys. Rev. C38, 696 (1988)
Bengtsson, R., Nazarewicz, W., Skeppstedt, Ö., Wyss, R.: Nucl. Phys. A528, 215 (1991)
Johnson, T.D., Glasmacher, T., Holcomb, J.W., Womble, P.C., Tabor, S.L., Nazarewicz, W.: Phys. Rev. C46, 516 (1992)
Semmes, P.: Private communication
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This research was supported by the Deutsches Bundesministerium für Forschung und Technologie. The authors gratefully acknowledge the help of the Cologne tandem accelerator crew during the experiments and of Prof. W. Nazarewicz for the use of the TRS calculations and advice concerning the interpretation. Acknowledgements go also to Dr. P. Semmes for use of the particle rotor codes.