Abstract
We identified twoα-emitting isotopes of element 107 with masses of 261 and 262 respectively by parent-daughter correlations. For the isotope with mass 262 we found two transitions with (102±26) ms and (8.0±2.1) ms half-life, which we assign to the groundstate and to an isomeric transition, respectively. The half-life of the isotope with mass 261 is (11.8 +5.3−2.8 ) ms. Spontaneous fission, which could be assigned to the decay of an isotope of element 107, was not detected in our experiments. This observation is in-line with our previous results, indicating a region of nuclei with strong microscopic stabilisation in the trans-actinides. Both new isotopes were produced by complete fusion of209Bi with54Cr. The production cross sections are (163±34) pb for262107 and (36 +22−14 ) pb for261107.
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Münzenberg, G., Hofmann, S., Heßberger, F.P., Reisdorf, W., Schmidt, K.-H., Schneider, J.R.H., Armbruster, P., Sahm, C.C., Thuma, B.: Z. Phys. A — Atoms and Nuclei300, 107 (1981)
Münzenberg, G., Armbruster, P., Faust, W., Güttner, K., Heßberger, F.P., Hofmann, S., Reisdorf, W., Sahm, C.C., Schmidt, K.-H., Schött, H.-J., Thuma, B., Vermeulen, D.: In: Actinides in perspective International Conference on Actinides 1981. Edelstein, N.M. (ed.) New York: Pergamon 1981
Heßberger, F.P., Münzenberg, G., Hofmann, S., Agarwal, Y.K., Poppensieker, K., Reisdorf, W., Schmidt, K.-H., Schneider, J.R.H., Schneider, W.F.W., Schött, H.-J., Armbruster, P., Thuma, B., Sahm, C.C., Vermeulen, D.: Z. Phys. A — Atoms and Nuclei322, 557 (1985)
Münzenberg, G., Hofmann, S., Heßberger, F.P., Schmidt, K.-H., Berthes, G., Folger, H., Geissel, H., Keller, J.G., Lemmertz, P., Montoya, M., Poppensieker, K., Quint, B., Schött, H.-J., Zychor, I., Armbruster, P., Leino, M.E., Gollerthan, U.: GSI Annual Report 1985, GSI 86-1, 31 (1986)
Heßberger, F.P., Münzenberg, G., Hofmann, S., Folger, H., Poppensieker, K., Schmidt, K.-H., Reisdorf, W., Armbruster, P., Leino, M.E.: Proceedings on Nuclei far from Stability, 5th International Conference, Rosseau Lake, Canada 1987. New York: American Institute of Physics 786 (1988)
Münzenberg, G., Hofmann, S., Heßberger, F.P., Ackermann, D., Folger, H., Ninov, V., Poppensieker, K., Quint, B., Reisdorf, W., Schmidt, K.-H., Schött, H.-J., Sümmerer, K., Armbruster, P., Gollerthan, U., Hanelt, E., Morawek, W., Fujita, Y., Schwab, T., Leino, M.E.: GSI Annual Report 1987, GSI 88-1, p. 13
Oganessian, Yu.Ts., Demin, A.G., Danilov, N.A., Ivanov, M.P., Iljinov, A.S., Kolesnikov, N.N., Markov, B.N., Plotko, V.M., Tretyakova, S.P., Flerov, G.N.: JETP Lett.23, 277 (1976)
Oganessian, Yu.Ts., Demin, A.G., Danilov, N.A., Flerov, G.N., Ivanov, M.P., Iljinov, A.S., Kolesnikov, N.N., Markov, B.N., Plotko, V.M., Tretyakova, S.P.: Nucl. Phys. A273, 505 (1976)
Flerov, G.N., Ter-Akopian, G.M.: Prog. Nucl. Part. Phys.19, 197 (1988)
Oganessian, Yu.Ts., Hussonnois, M., Demin, A.G., Kharitonov, Yu.P., Bruchertseifer, H., Constantinescu, O., Korotkin, Yu.S., Tretyakova, S.P., Utyonkov, V.K., Shirokovski, I.V., Estevez, J.: Radiochim. Acta37, 113 (1985)
Münzenberg, G., Reisdorf, W., Hofmann, S., Agarwal, Y.K., Heßberger, F.P., Poppensieker, K., Schneider, J.R.H., Schneider, W.F.W., Schmidt, K.-H., Schött, H.-J., Armbruster, P., Sahm, C.C., Vermeulen, D.: Z. Phys. A — Atoms and Nuclei315, 145 (1984)
Strehl, P.: 9th Conference on Cyclotron and Application 1981, Caen, p. 545; Les ULIS, Cedex: Les Editions de Physique 1982
Münzenberg, G., Faust, W., Hofmann, S., Armbruster, P., Güttner, K., Ewald, H.: Nucl. Instrum. Methods161, 65 (1979)
Hofmann, S., Münzenberg, G., Heßberger, F.P., Schött, H.-J.: Nucl. Instr. Meth.223, 312 (1984)
Faust, W., Münzenberg, G., Hofmann, S., Reisdorf, W., Schmidt, K.-H., Armbruster, P., Güttner, K.: Nucl. Instrum. Methods166, 397 (1979)
Schmidt, K.-H., Sahm, C.C., Pielenz, K., Clerc, H.G.: Z. Phys. A — Atoms and Nuclei316, 19 (1984)
Schmidt, K.-H., Faust, W., Münzenberg, G., Clerc, H.G., Lang, W., Pielenz, K., Vermeulen, D., Wohlfahrt, H., Ewald, H., Güttner, K.: Nucl. Phys. A318, 253 (1979)
Lemmertz, P., Alquist, L.I., Fass, R., Wollnik, H., Hirdes, D., Jungclas, D., Brandt, R., Schardt, D., Zylicz, I.: Z. Phys. A — Atoms and Nuclei298, 311 (1980)
Keller, J.G., Schmidt, K.-H., Heßberger, F.P., Münzenberg, G., Reisdorf, W., Clerc, H.G., Sahm, C.C.: Nucl. Phys. A452, 173 (1986)
Heßberger, F.P.: Thesis, Internal Report GSI-85-11 (1985)
Armbruster, P.: Ann. Rev. Nucl. Phys.35, 135 (1985)
Randrup, J., Tsang, C.F., Møller, P., Nilsson, S.G., Larsson, S.E.: Nucl. Phys. A217, 221 (1973)
Münzenberg, G., Armbruster, P., Berthes, G., Folger, H., Heßberger, F.P., Hofmann, S., Keller, J., Poppensieker, K., Quint, A.B., Reisdorf, W., Schmidt, K.-H., Schött, H.-J., Sümmerer, K., Zychor, I., Leino, M.E., Hingmann, R., Gollerthan, U., Hanelt, E.: Z. Phys. A — Atomic Nuclei328, 49 (1987)
Münzenberg, G., Hofmann, S., Heßberger, F.P., Folger, H., Ninov, V., Poppensieker, K., Quint, A.B., Reisdorf, W., Schött, H.-J., Sümmerer, K., Armbruster, P., Leino, M.E., Ackermann, D., Gollerthan, U., Hanelt, E., Morawek, W., Fujita, Y., Schwab, Th., Türler, A.: Z. Phys. A330, 435 (1988)
Scholz, A.L. (ed.): At. Nucl. Data Tables39, 289 (1988)
Møller, P., Nix, J. R.: At. Nucl. Data Tables39, 213 (1988)
Ahmad, J., Diamond, H., Milsted, J., Cerner, J., Sjoblom, R.K.: Nucl. Phys. A208, 287 (1979)
Hyde, E.K., Perlman, I., Seaborg, G.T.: The Nuclear Properties of the Heavy Elements, Prentice-Hall, New Jersey UK (1964)
Møller, P.: Private communication 1988
Sobiczewski, A.: Private communication 1988
Dahlinger, M., Vermeulen, D., Schmidt, K.-H.: Nucl. Phys. A276, 94 (1982)
Vermeulen, D., Clerc, H.G., Sahm, C.C., Schmidt, K.H., Keller, J.G., Münzenberg, G., Reisdorf, W.: Z. Phys. A — Atoms and Nuclei318, 157 (1984)
Sahm, C.C., Clerc, H.G., Schmidt, K.-H., Reisdorf, W., Armbruster, P., Heßberger, F.P., Keller, J.G., Münzenberg, G., Vermeulen, D.: Nucl. Phys. A441, 316 (1985)
Keller, H., Bellwied, R., Lützenkirchen, K., Kratz, J.V., Brüchle, W., Gäggeler, H., Moody, K.J., Schädel, M., Wirth, G.: Z. Phys. A — Atomic Nuclei328, 255 (1987)
Quint, A.B.: Diss. Darmstadt (1988)
Armbruster, P.: Trends in nuclear physics. Varenna, Italy 1987
Bass, R.: Proceedings of the Conference on ‘Deep Inelastic and Fusion Reactions with Heavy Ions’ Berlin 1979, p. 281, Berlin, Heidelberg, New York: Springer 1980
Blocki, J., Feldmeier, H., Swiatecki, W.J.: Nucl. Phys. A459, 145 (1986)
Davies, K.T.R., Sierk, A., Nix, J.R.: Phys. Rev. C28, 679 (1983)
Bock, R., Chu, Y.T., Dakowski, M., Gobbi, A., Grosse, Z., Olmi, A., Sann, H., Schwalm, D., Lynen, U., Müller, W., Bjornholm, S., Esbensen, H., Wölfli, W., Morenzoni, E., A388, 334 (1982)
Heßberger, F.P., Münzenberg, G., Hofmann, S., Reisdorf, W., Schmidt, K.-H., Schött, H.-J., Armbruster, P., Hingmann, R., Thuma, B., Vermeulen, D.: Z. Phys. A321, 317 (1985)
Reisdorf, W. et al.: (to be published)
Ghiorso, A., Nitschke, J.M., Alonso, I.R., Alonso, C.T., Nurmia, M., Seaborg, G.T., Hulet, E.K., Lougheed, R.W.: Phys. Rev. Lett.33, 1490 (1974)
Armbruster, P.: Proc. Int. Conf. On Clustering Aspects in Nuclear and Subnuclear Systems, 1988, Preprint GSI-88-38 (1980)
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On leave form Warsaw University, Warsaw, Poland
The authors thank G. Berthes, P. Lemmertz, and M. Montoya for their help during the experiment. They also thank N. Angert and the UNILAC staff for the excellent performance of the accelerator. We are indebted to M. Müller and W. Jacoby for the development of the highly efficient sources for isotopically enriched material and W. Hartmann, J. Klemm, and W. Thalheimer for the skilful preparation of the large area Bi-targets. Further we are endebted to the GSI experimental electronics group, namely M. Richter, for their helpful assistance. We also thank H.G. Burkhard who is in charge of the mechanical set-ups for the SHIP experiments.