Abstract
Two collective bands of75Kr have been extended up to spin 21/2 using the compound reactions64Zn(14N,p2n)75Kr and50Cr(28Si, 2pn)75Kr. Spins and parities were assigned from neutron-gatedγ-ray angular distributions and excitation functions using the OSIRIS anti-Compton spectrometer. The bands are interpreted to be built on the well-deformed Nilsson states: [442] 5/2 and [301] 3/2. Energies for both bands and the order of magnitude of the mixing ratios in thef 5/2 band can be reproduced within the single-particle-plus-rotor model, while the experimentalQ(I→I−1)/Q(I→I−2) ratios, deduced from mixing ratios and branching ratios, exhibit large deviations by a factor 4 to 6 from theoretical values (which are around one). An explanation of this effect may be found by treating the two rotational bands each as a result of mixing between rotational bands of oblate and prolate states; thus explaining the large difference between B(E2,I→I−1) andB(E2, I →I−2) in the bands of75Kr.
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Nazarewicz, W., Dudek, J., Bengtsson, R., Bengtsson, T., Ragnarsson, I.: Nucl. Phys. A435, 397 (1985)
Heyde, K., Jolie, J., Moreau, J., Ryckebusch, J., Waroquier, M., van Duppen, P., Huyse, M., Wood, J.L.: Nucl. Phys. A466, 189 (1987)
Heyde, K., Ryckebusch, J., Waroquier, M., Wood, J.L.: Nucl. Phys. A484, 275 (1988)
Hamilton, J.H., Ramayya, A.V., Pinkston, W.T., Ronningen, R.M., Garcia-Bermudez, G., Carter, H.K., Robinson, R.L., Kim, H.J., Sayer, R.O.: Phys. Rev. Lett.32, 239 (1974)
Bengtsson, R., Möller, P., Nix, J.R., Zhang, J.: Phys. Scr.29, 402 (1984)
Wiosna, M., Busch, J., Eberth, J., Liebchen, M., Mylaeus, T., Schmal, N., Sefzig, R., Skoda, S., Teichert, W.: Phys. Lett.200B, 255 (1988)
Piercey, R.B., Hamilton, J.H., Soundranayagam, R., Ramayya, A.V., Maguire, C.F., Sun, X.-J., Zhao, Z.Z., Robinson, R.L., Kim, H.J., Frauendorf, S., Döring, J., Funke, L., Winter, G., Roth, J., Cleemann, L., Eberth, J., Neumann, W., Wells, J.C., Lin, J., Rester, A.C., Carter, H.K.: Phys. Rev. Lett.47, 1514 (1981)
Roth, J.: Ph.D. Thesis, Köln 1981 (unpublished)
Winter, G., Döring, J., Fromm, W.D., Funke, L., Kemnitz, P., Will, E.: Z. Phys. A — Atoms and Nuclei309, 243 (1983)
Garcia Bermudez, G., Baktash, C., Lister, C.J.: Phys. Rev. C30, 1208 (1984)
Herath-Banda, M.A., Ramayya, A.V., Cleemann, L., Eberth, J., Roth, J., Heck, T., Schmal, N., Mylaeus, T., Koenig, W., Martin, B., Bethge, K., Leander, G.A.: J. Phys. G13, 43 (1987)
Chishti, A.A., Campbell, M., Gelletly, W., Goettig, L., James, A.N., Lister, C.J., Love, D.J.G., McNeill, J.H., Moscrop, R., Skeppstedt, O., Varley, B.J.: Proceedings of the Workshop on Nuclear Structure of the Zirkonium Region, Bad Honnef, 1988. Eberth, J., Meyer, R.A., Sistemich, K. (eds.) Berlin, Heidelberg, New York: Springer 1988
Allen, K.W.: In: The electromagnetic interaction in nuclear spectroscopy. Hamilton, W.D. (ed.) Amsterdam: North-Holland 1975
Northcliffe, L.C., Schilling, R.F.: Nucl. Data Tables A7, 233 (1970)
Ekström, L.P.: Nucl. Data Sheets32, 211 (1981)
Lieder, R.M., Jäger, H., Neskakis, A., Venkova, T., Michel, C.: Nucl. Instr.220, 363 (1984)
Neumann, W.: Ph.D. Thesis, Köln 1983 (unpublished)
Morinaga, H., Yamazaki, T.: In-beam gamma-ray spectroscopy. Amsterdam: North-Holland 1976
Zobel, V., Cleemann, L., Eberth, J., Hellmeister, H.P., Neumann, W., Wiehl, N.: Nucl. Instr.171, 223 (1980)
Lühmann, L., Debray, M., Lieb, K.P., Nazarewicz, W., Wörmann, B.: Phys. Rev. C31, 828 (1985)
Ahalpara, D.P., Abzouzi, A., Bhatt, K.H.: Nucl. Phys. A445, 1 (1985)
Griffiths, A.G., Ashworth, C.J., Grant, I.S., Rikorska, J., Stone, N.J., Walker, P.M., Walters, W.B., White, J.P.: Hyperf. Interact.43, 481 (1988)
Farhan, A.R., Rab, S., Singh, B.: Nucl. Data Sheets57, 223 (1989)
Toki, H., Faessler, A.: Nucl. Phys. A253, 231 (1975)
Faessler, A., Toki, H.: Phys. Lett.59B, 211 (1975)
Toki, H., Faessler, A.: Z. Phys. A — Atoms and Nuclei276, 35 (1976)
Toki, H., Faessler, A.: Phys. Lett.63B, 121 (1976)
Auble, R.L.: Nucl. Data Sheets20, 327 (1977)
Ring, P., Schuck, P.: The nuclear many-body problem. Berlin, Heidelberg, New York: Springer 1980
Bengtsson, R., Frauendorf, S., May, F.-R.: At. Data Nucl. Data Tables35, 16 (1986)
Kern, B.D., Toth, K.S., Moltz, D.M., Lin, J., Avignone, F.T., Noma, H., Leander, G.A.: Phys. Rev. C28, 2168 (1983)
Bohr, A., Mottelson, B.R.: Nuclear structure, Vol. 2. New York: W.A. Benjamin 1975
Hagemann, G.B., Garrett, J.D., Herskind, B., Sletten, G., Tjøm, P.O., Henriquez, A., Ingebretsen, F., Rekstad, J., Løvhøjden, G., Thorsteinsen, T.F.: Phys. Rev. C25, 3224 (1982)
Hagemann, G.B., Garrett, J.D., Herskind, B., Kownacki, J., Nyako, B.M., Nolan, P.L., Sharpey-Schafer, J.F., Tjøm, P.O.: Nucl. Phys. A424, 365 (1984)
Hamamoto, I.: Ann. Isr. Phys. Soc.,7; Proc. Workshop on Electromagn. Prop. of High-Spin Levels, Rehovot, 1984. Goldring, G., Hass, M. (eds.), p. 209. Bristol: Adam Hilger 1984
Wörmann, B., Lieb, K.P., Diller, R., Lühmann, L., Keinonen, J., Cleemann, L., Eberth, J.: Nucl. Phys. A431, 170 (1984)
Lühmann, L.: Ph.D. Thesis, Göttingen 1985 (unpublished)
Gross, C.J., Cottle, P.D., Headly, D.M., Hüttmeier, U.J., Moore, E.F., Tabor, S.L., Nazarewicz, W.: Phys. Rev. C36, 2601 (1987)
Hamamoto, I.: Phys. Lett.193B, 399 (1987)
Yoshida, N., Saagwa, H., Otsuka, T., Arima, A.: Phys. Lett.215B, 15 (1988)
Gascon, J., Taras, P., Radford, D.C., Ward, D., Andrews, H.R., Banville, F.: Nucl. Phys. A467, 539 (1987)
Piercey, R.B., Ramayya, A.V., Hamilton, J.H., Sun, X.J., Zhao, Z.Z., Robinson, R.L., Kim, H.J., Wells, J.C.: Phys. Rev. C25, 1941 (1982)
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This work was supported in part by Deutsches Bundesministerium für Forschung und Technologie (BMFT), Bonn under contract no. 060K272, in part by U.S. Dept. of Energy grant No. DE-FG05-87ER40330 (Ga. Tech.) and in part by NATO research grant No. RG-86/0452 (Ga. Tech.). Discussions with W. Nazarewicz and I. Hamamoto are gratefully acknowledged. We are especially indebted to G. Hagemann for fruitfull discussions.