Abstract
The earlier preliminary assignment of a 1,055±6 keV proton line to direct proton decay of147Tm is supported by cross bombardment measurements and by a negative result from a positron-proton coincidence experiment. The half-life was remeasured to be 0.56 ±0.04s. For two types of thermal ion sources, overall efficiencies were estimated for on-line mass separation of known short-lived isotopes of promethium, europium, terbium, and holmium. Direct proton decay was searched for among very neutron-deficient isotopes of these elements, and of iodine and caesium. No evidence for direct proton decay was found. Based on estimated overall efficiencies, on calculated cross-sections, and on predictions from the gross-theory ofβ decay, half-life limits for direct proton decay were deduced.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Hofmann, S., Reisdorf, W., Münzenberg, G., Heßberger, F.P., Schneider, J.R.H., Armbruster, P.: Z. Phys. A — Atoms and Nuclei305, 111 (1982)
Klepper, O., Batsch, T., Hofmann, S., Kirchner, R., Kurcewicz, W., Reisdorf, W., Roeckl, E., Schardt, D., Nyman, G.: Z. Phys. A — Atoms and Nuclei305, 125 (1982)
Maripuu, S.: 1975 Mass Predictions. At. Data Nucl. Data Tables17, 476 (1976)
Karnaukhov, V.A., Ter-Akopyan, G.M.: Phys. Lett.12, 339 (1964)
Bruske, C., Burkard, K.H., Hüller, W., Kirchner, R., Klepper, O., Roeckl, E.: Nucl. Instrum. Methods186, 61 (1981)
Kirchner, R., Burkard, K.H., Hüller, W., Klepper, O.: Nucl. Instrum. Methods186, 295 (1981)
Reisdorf, W.: Z. Phys. A — Atoms and Nuclei300, 227 (1981) and to be published
Takahashi, K., Yamada, M., Kondoh, T.: At. Data Nucl. Data Tables12, 101 (1973)
Lederer, C.M., Shirley, V.S.: Table of Isotopes 7th Edition. New York: John Wiley and Sons. Inc. 1978
Nolte, E., Gui, S.Z., Colombo, G., Korschinek, G., Eskola, K.: Z. Phys. A — Atoms and Nuclei306, 223 (1982)
Toth, K.S., Bingham, C.R., Zolnowski, D.R., Cala, S.E., Carter, H.K., Sousa, D.C.: Phys. Rev. C19, 482 (1979)
Bogdanov, D.D., Bochin, V.P., Karnaukhov, V.A., Petrov, L.A.: Yad. Fiz.16, 890 (1972)
D'Auria, J.M., Grüter, J.W., Hagberg, E., Hansen, P.G., Hardy, J.C., Hornshoj, P., Jonson, B., Mattsson, S., Ravn, H.L., Tidemand-Petersson, P.: Nucl. Phys. A301, 397 (1978)
Feix, W.F., Hilf, E.R.: Phys. Lett.120B 14 (1983)
Feix, W.F., Hilf, E.R.: (in preparation)
Schardt, D., Kirchner, R., Reisdorf, W., Roeckl, E., Tidemand-Petersson, P., Ewan, G.T., Hagberg, E., Jonson, B., Mattson, S., Nyman, G.: Nucl. Phys. A326, 65 (1979)
Schardt, D., Batsch, T., Kirchner, R., Klepper, O., Kurcewicz, W., Roeckl, E., Tidemand-Petersson, P.: Nucl. Phys. A368, 153 (1981); A368, 153 (1981)
Klepper, O.: Nucl. Instrum. Methods186, 385 (1981)
Faestermann, T., Gillitzer, A., Hartel, K., Kienle, P., Nolte, E.: Proc. Int. Conf. on Nucl. Phys., Florence (1983), Vol. 1, p. 311
Author information
Authors and Affiliations
Additional information
On leave of absence from Department of Physics, Chalmers University of Technology, S-41296 Göteborg, Sweden
The authors are indebted to Dr. S. Hofmann, Prof. E.R. Hilf, and Dr. W. Reisdorf for valuable discussions on various aspects of this work. We also wish to thank C. Bruske, K.H. Burkard and W. Hüller for their help in operating the on-line mass separator.
Rights and permissions
About this article
Cite this article
Larsson, P.O., Batsch, T., Kirchner, R. et al. Direct proton decay of 0.56-s147Tm and search for this decay mode among very neutron-deficient isotopes with 53≦Z≦67. Z Physik A 314, 9–16 (1983). https://doi.org/10.1007/BF01411823
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF01411823