Abstract
Theγ ray continuum structures of the transitional Er isotopes withA∼154 are studied using the reaction74Ge(84Kr,xn)158−xEr atE lab=340 MeV. The measurements include energy spectra, total energies, multiplicities, angular distributions and lifetimes using the DSAM method. The analysis of data confirms the previously observed two-bump structure of the continuum radiation. A meticulous subtraction of discrete contributions proves the persistence of the low-energy bump even at high spins, i.e.I>40ħ. The angular-distribution measurements assign predominant dipole structure to the bump atE γ=0.65 MeV, whereas the bump atE γ=1.3 MeV is of almost pure quadrupole character at high spins. The lifetime measurements give evidence for a strong enhancement of theB(E2) values of the upper bump,B(E2)/B sp>130. Spin-selection studies reveal, in the spin rangeI=30−50ħ an almost constant energy for the 1.3 MeV bump,ΔE<60 keV.
Similar content being viewed by others
References
Borggreen, J., Bjørnholm, S., Christensen, O., Del Zoppo, A., Herskind, B., Pedersen, J., Sletten, G., Folkmann, F., Simon, R.S.: Z. Phys. A — Atoms and Nuclei294, 113 (1980)
Daly, P.: Proceedings of the 5th Nordic Meeting on Nuclear Physics (Jyväskylä, Finland, 1984) p. 5
Beck, F.A., Dudek, J., Haas, B., Merdinger, J.C., Nourredine, A., Schutz, Y., Vivien, J.P., Hubert, Ph., Dassié, D., Bastin, G., Nguyen, L., Thibaud, J.P., Nazarewicz, W.: Z. Phys. A — Atoms and Nuclei319, 119 (1984)
Burde, J., Dines, E.L., Shih, S., Diamond, R.M., Draper, J.E., Lindenberger, K.H., Schück, C., Stephens, F.S.: Phys. Rev. Lett.48, 8 (1982)
Aguer, P., Bastin, G., Thibaud, J.P., Barnéoud, D., Boutet, J., Foin, C.: J. Phys. G; Nucl. Phys.3, L157 (1977); Z. Phys. A — Atoms and Nuclei285, 59 (1978)
Baktash, C., Mateosian, E. der, Kistner, O.C., Sunyar, A.W.: Phys. Rev. Lett.42, 637 (1979)
Bastin, G., Péghaire, A., Thibaud, J.P., André, S., Barnéoud, D., Foin, C., Aguer, P.: Nucl. Phys. A345, 302 (1980)
Horn, D., Young, G.R., Lister, C.J., Baktash, C.: Phys. Rev. C23, 1040 (1981)
Foin, C., André, S., Barnéoud, D., Bastin, G., Péghaire, A., Thibaud, J.P.: Z. Phys. A — Atoms and Nuclei305, 81 (1982)
Dafni, E., Bendahan, J., Broude, C., Goldring, G., Hass, M., Nairn, E., Rafailovich, M.H., Chasman, C., Kistner, O., Vajda, S.: Phys. Rev. Lett.53, 2473 (1984)
Cerkaski, M., Dudek, J., Rozmej, P., Szymanski, Z., Nilsson, S.G.: Nucl. Phys. A315, 269 (1979)
Aguer, P., Bastin, G., Charmant, A., El Masri, Y., Hubert, Ph., Janssens, R., Michel, C., Thibaud, J.P., Vervier, J.: Phys. Lett.82 B, 55 (1979)
Nguyen, L., Sergolle, H., Aguer, P., Auger, G., Bastin, G., Lönnroth, T., Thibaud, J.P., Thomé, L.: Z. Phys. A — Atoms and Nuclei309, 207 (1983)
Häusser, O., Ward, D., Andrews, H.R., Taras, P., Deleplanque, M.A., Haas, B., Diamond, R.M., Dines, E.L., Machiavelli, A.O., McDonald, R., Stephens, F.S., Stager, C.U.: Phys. Lett.144 B, 341 (1984)
Deleplanque, M.A., Husson, J.P., Perrin, N., Stephens, F.S., Bastin, G., Schück, C., Thibaud, J.P., Hildingsson, L., Hjorth, S., Johnson, A., Lindblad, Th.: Phys. Rev. Lett.43, 1001 (1979)
Aguer, P., Bastin, G., Péghaire, A., Thibaud, J.P., Perrin, N., Sergolle, H., Hubert, Ph.: Phys. Scr.24, 180 (1981)
Thibaud, J.P., Aguer, P., Bastin, G., Nguyen, L., Perrin, N., Sergolle, H., Gizon, J., Hubert, Ph., Villard, M.M.: Z. Phys. A — Atoms and Nuclei321, 275 (1985)
Bohr, Aa., Mottelson, B.R.: Phys. Scr.24, 71 (1981)
Cwiok, S.: Z. Phys. A — Atoms and Nuclei314, 337 (1983)
Andersson, C.G., Bengtsson, R., Bengtsson, T., Krumlinde, J., Leander, G., Neergard, K., Olanders, P., Pinston, J.A., Ragnarsson, I., Szymanski, Z., Aberg, S.: Phys. Scr. A24, 266 (1981)
Hübel, H., Smilansky, U., Diamond, R.M., Stephens, F.S., Herskind, B.: Phys. Rev. Lett.41, 791 (1978)
Hübel, H., Diamond, R.M., Aguer, P., Ellegaard, C., Fossan, D.B., Kluge, H., Schück, C., Shih, S., Stephens, F.S., Smilansky, U.: Z. Phys. A — Atoms and Nuclei304, 225 (1982)
Kroth, R., Aguer, P., Bastin, G., Hübel, H., Nguyen, L., Sergolle, H., Thibaud, J.P.: Proceedings of the International Conference on High Angular Momentum Properties of nuclei (Oak Ridge, 1982), p. 357
Bogaert, G., Aguer, P., Bastin, G., Hildingsson, L., Kroth, R., Lönnroth, T., Nguyen, L., Sergolle, H., Soramel, F., Thibaud, J.P.: Workshop on Electromagnetic Properties of High Spin Nuclear Levels (Rehovot, Israel, 1984)
Meunier, R., Daban-Haurou, J.L., Salomé, M., Nickel, F.: Nucl. Instrum. Methods186, 7 (1981)
Pouthas, J.: Nucl. Instrum. Methods135, 167 (1976)
Nguyen, L.: Thèse 3ème cycle (Orsay, 1982), unpublished
Bogaert, G.: Thèse 3ème cycle n∘ 3709 (Orsay, 1984), unpublished
Mollenauer, J.F.: Phys. Rev.127, 687 (1962)
Lindhard, J., Scharff, M., Schiott, H.E.: K. Dan. Viddens. Selsk. Mat. Fys. Medd.33, 14 (1963)
Northcliffe, L.C., Schilling, R.F.: Nucl. Data Tables A7, 233 (1970)
Körner, H.J., Hillis, D.L., Roulet, C., Aguer, P., Ellegaard, C., Fossan, D.B., Habs, D., Neiman, M., Stephens, F.S., Diamond, R.M.: Phys. Rev. Lett.43, 490 (1979)
Fewell, M.P., Baktash, C., Guidry, M.W., Hattula, J.S., Johnson, N.R., Lee, I.Y., McGowan, F.K., Ower, H., Pancholi, S.C., Riedinger, L.L., Wells, J.C.: Proceedings of the International Conference on High Angular Momentum Properties of Nuclei (Oak Ridge, 1982), p. 69
Dudek, J., Nazarewicz, W.: Phys. Rev. C31, 298 (1985)
Lee, I.Y.: Proceedings of the International Conference on High Angular Momentum Properties of Nuclei (Oak Ridge, 1982), p. 339
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Bogaert, G., Aguer, P., Bastin, G. et al. Decay properties of very-high-spin states in transitional Er nuclei aroundA=154. Z. Physik A - Atomic Nuclei 324, 107–116 (1986). https://doi.org/10.1007/BF01290761
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF01290761