Abstract
Neutron-rich isotopes of astatine have been produced through spallation reactions with 600 MeV protons on a232Th target and identified by spectroscopic techniques combined with one-line mass separation at the ISOLDE facility. The half-lives of218At and219At have been remeasured to be 1.5(3) s and 57(4) s, respectively. Four new isotopes of astatine,220−223At, have been observed for the first time, and their half-lives were found to be 3.73(13) min, 2.3(2) min, 54(10) s, and 50(7) s, respectively. Another nuclide,216Bi, has been observed for the first time as the daughter product of the220At alpha decay, and its half-life has been measured to be 6.6(21) min.
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References
Kurcewicz, W., Ruchowska, E., Kaffrell, N., Bjørnstad, T., Nyman, G.: Nucl. Phys. A356, 15 (1981); Proceedings of the 4th International Conference on Nuclei far from Stability, Helsingør, 1981 p. 649, CERN 81-09, Geneva, 1981
Sheline, R.K., Decman, D., Nybø, K., Thorsteinsen, T.F., Løvhøiden, G., Flynn, E.R., Cizewski, J.A., Burke, D.G., Sletten, G., Hill, P., Kaffrell, N., Kurcewicz, W., Nyman, G., Leander, G.: Phys. Lett.133 B, 13 (1983)
Borge, M.J.G., Burke, D.G., Gietz, H., Hill, P., Kaffrell, N., Kurcewicz, W., Løvhøiden, G., Mattsson, S., Naumann, R.A., Nybø, K., Nyman, G., Thorsteinsen, T.F.: Nucl. Phys. A464, 189 (1987), and references given therein
Rohozinski, S.G.: Rep. Prog. Phys.51, 541 (1988)
Nazarewicz, W., Glanders, P., Ragnarsson, I., Dudek, J., Leander, G.A., Möller, P., Ruchowska, E.: Nucl. Phys. A429, 269 (1984)
Leander, G.A., Chen, Y.S.: Phys. Rev. C37, 2744 (1988)
Hoff, P. et al.: In preparation
Vosicki, B., Bjørnstad, T., Carraz, L.C., Heinemeier, J., Ravn, H.L.: Nucl. Instrum. Methods186, 307 (1981)
Ravn, H.L., Carraz, L.C., Denimal, J., Kugler, E., Skarestad, M., Sundell, S., Westgaard, L.: Nucl. Instrum. Methods139, 267 (1976)
Ellis-Akovali, Y.A.: Nucl. Data Sheets52, 789 (1987)
Hyde, E.K., Ghiorso, A.: Phys. Rev.90, 267 (1953)
Nurmia, M., Giessing, D., Sieviers, W., Varga, L.: Ann. Acad. Sci. Fenn. Ser. A VI, No. 167 (1965)
Rytz, A.: At. Data Nucl. Data Tables23, 507 (1979)
Martin, M.J.: Nucl. Data Sheets49, 83 (1986)
Wapstra, A.H., Audi, G., Hoekstra, R.: At. Data Nucl. Data Tables39, 281 (1988)
Momyer, F.F. Jr., Hyde, E.K.: Phys. Rev.101, 136 (1956)
Takahashi, K., Yamada, M., Kondoh, T.: At. Data Nucl. Data Tables12, 101 (1973); Yoshizawa, Y., Horiguchi, T., Yamada, M.: Chart of the nuclides. Japanese Nuclear Data Commitee and Nuclear Data Center, 1980
Klapdor, H.V., Metzinger, J., Oda, T.: At. Data Nucl. Data Tables31, 81 (1984)