Abstract
The electron-capture decay of228Pa to levels in228Th has been studied using mass-separated sources and high-resolutionγ-ray and conversion-electron spectroscopy. A level at 979.5 keV is assigned as 2+ member of a second excited Kπ=0+ band, with the 0+ band head at 938.6 keV. The 2+ and 3+ members of a second excited Kπ=2+ band at 1153.5 and 1200.5 keV, which decay by strongE0 transitions to the 969 keVγ-vibrational band, are confirmed. In addition we tentatively propose a Kπ=1+ band at 944 keV. The Kπ=0−, 1− and 2− members of the octupole quadruplet are confirmed, and theγ decay of these levels is analysed in an approach, in which the mixing of the octupole bands by the Coriolis interaction is taken into account. It is suggested that octupole correlations might be important for theE1 transition moments. A total of 29 levels is observed between ∼1.4 and ∼2.0 MeV, for which the nuclear structure, and the possible assignment to rotational bands, is unclear.
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Rohozinski, S.G.: Rep. Prog. Phys. 51, 541 (1988)
Åberg, S., Flocard, H., Nazarewicz, W.: Ann. Rev. Nucl. Part. Sc. 40, 439 (1990)
Maher, J.V., Erskine, J.R., Friedman, A.M., Siemssen, R.H., Schiffer, J.P.: Phys. Rev. C5, 1380 (1972)
Dalmasso, J., Maria, H., Ardisson, G.: Phys. Rev. C36, 2510 (1987)
Daley, H.J., Barrett, B.R.: Nucl. Phys. A449, 256 (1986)
Otsuka, T., Sugita, M.: J. Phys. Soc. Japan 58, Suppl. p. 530 (1989)
Hardt, K., Schüler, P., Günther, C., Recht, J., Blume, K.P., Wilzek, H.: Nucl. Phys. A419, 34 (1984)
Ackermann, B., Baltzer, H., Ensel, C., Freitag, K., Grafen, V., Günther, C., Herzog, P., Manns, J., Marten-Tölle, M., Müller, U., Prinz, J., Romanski, I., Tölle, R., de Boer, J., Gollwitzer, N., Maier, H.J.: Nucl. Phys. A559, 61 (1993)
Kurcewicz, W., Stryczniewicz, K., Zylicz, J., Broda, R., Chojnacki, S., Walus, W., Yutlandov, I.: J. Phys. (Paris) 34, 159 (1973)
Zeyen, P., Ackermann, B., Dämmrich, U., Euler, K., Grafen, V., Günther, C., Herzog, P., Marten-Tölle, M., Prillwitz, B., Tölle, R., Lauterbach, Ch., Maier, H.J.: Z. Phys. A328, 399 (1987)
Herrmann, C.-D., Prillwitz, B., Dämmrich, U., Freitag, K., Herzog, P., Mayer, D., Schlösser, K., Ragnarsson, I.: Nucl. Phys. A493, 83 (1989)
Herment, M., Vieu, M.C.: C. R. Acad. Sci. Paris 273B, 1058 (1971)
Devare, S.H., Devare, H.G.: Phys. Rev. C9, 2297 (1974)
Arbman, E., Bjørnholm, S., Nielsen, O.B.: Nucl. Phys. 21, 406 (1960)
Krane, K.S.: In: Low temperature nuclear orientation. Stone, N.J., Postma, H. (eds.), chap. 2. Amsterdam: North-Holland 1986
Herzog, P., Dämmrich, U., Freitag, K., Prillwitz, B., Prinz, J., Schlösser, K.: Nucl. Instrum. Methods B26, 471 (1987)
Martin, M.J.: Nuclear Data Sheets 49, 136 (1986)
Baltzer, H., deBoer, J., Gollwitzer, A., Graw, G., Günther, C., Loewe, M., Manns, J., Müller, U., Valnion, B.D., Weber, T., Würkner, M.: to be published
Broglia, R.A., Hansen, O., Riedel, C.: Advances in Nuclear Physics 6, 287 (1973)
Gove, N.B., Martin, M.J.: Nuclear Data Tables A10, 205 (1971)
Bohr, A., Mottelson, B.R.: Nuclear structure. Vol. II. Reading, Mass.: Benjamin 1975
Kurcewicz, W., Kaffrell, N., Trautmann, N., Plochocki, A., Zylicz, J., Matul, M., Stryczniewicz, K.: Nucl. Phys. A289, 1 (1977)
Raman, S., Malarkey, C.H., Milner, W.T., Nestor, Jr., C.W., Stelson, P.H.: At. Nucl. Data Tables 36, 1 (1989)
McGowan, F.K., Bemis, Jr., C.E., Milner, W.T., Ford, Jr., J.L.C., Robinson, R.L., Stelson, P.H.: Phys. Rev. C10, 1146 (1974)
Neergard, K., Vogel, P.: Nucl. Phys. A149, 217 (1970)
Sood, P.C., Headly, D.M., Sheline, R.K.: At. Nucl. Data Tables 51, 273 (1992)
Piepenbring, R.: Phys. Rev. C27, 2968 (1983)
Daley, H.J.: private communication quoted by Dalmasso et al.[4]
Lourens, W., Ten Brink, B.O., Wapstra, A.H.: Nucl. Phys. A152. 463 (1970)
Bjørnholm, S., Borggreen, J., Davies, D., Hansen, N.J.S., Pedersen, J., Nielsen, H.L.: Nucl. Phys. A118, 261 (1968)
Kantele, J.: In: Heavy Ions and Nuclear Structure, Proceedings of the XIV Summer School, Mikolajki, Poland, 1984. Sikora, B., Wilhelm, Z. (eds.). New York: Harwood Academic 1984
Bell, D.A., Aveledo, C.E., Davidson, M.G., Davidson, J.P.: Can. J. Phys. 48, 2542 (1970)
Xu, Y., Krane, K.S., Gummin, M.A., Jarrio, M., Wood, J.L., Zganjar, E.F., Carter, H.K.: Phys. Rev. Lett. 68, 3853 (1992)
Heyde, K., Meyer, R.A.: Phys. Rev. C37, 2170 (1988)
Soloviev, V.G., Siklos, T.: Nucl. Phys. 59, 145 (1964)
Körten, W., Härtlein, T., Gerl, J., Habs, D., Schwalm, D., Schwalm, D.: Phys. Lett. B 317, 19 (1993)
Skalski, J.: Phys. Rev. C43, 140 (1991)
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We would like to thank T. Otsuka for stimulating discussions and for bringing to our attention his work on228Th. J. deBoer has carefully read our paper and has suggested numerous improvements. We appreciate the help of Mr. Assmus with the proton irradiations and the financial support by the Kernforschungszentrum Karlsruhe. The former members of the NO group (C.-D. Herrmann, B. Prillwitz, J. Prinz, I. Romanski) have contributed to this work during various stages of the measurements. This work was supported by the Deutsche Forschungsgemeinschaft (grants Gu 179/3-1 and He 1316/2-3).