Abstract
Theβ −-decay of 16766 Dy produced through the fast neutron reaction170Er(n, α)167Dy has been investigated by using several kinds of detectors and a high-capacity two-parameter recording system. The half-life andβ −-decay energy of167Dy were determined to beT 1/2 = 6.20 ± 0.08min andQ β-=2.35±0.06, respectively. The observed level scheme of 16767 Ho (completely unknown previously) contains 12 states, among them a 6.0±0.1 μsM2 isomer at 259.3 keV. On the basis of theoretical and systematic considerations combined with multipole determinations, the following Nilsson model assignments are proposed for the lowest states of167Ho: 0 keV (7−/2 [523]), 259.3 keV (3+/2[411]), 319.8 keV (5/2 3+/2[411]), 392.5 keV (1+/2[411]), 410.0 keV (3/2 1+/2[411]), 569.7 keV (3−/2{7−/2[523], 2+}). Theβ-decay proceeds mainly to the proposed gamma-vibrational state at 569.7 keV with an anomalously low logft value 5.4, indicating similarity between the microscopic structures of this state and the famous ¦K 0−2¦ gamma vibration of165Ho.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Wille, R.G., Fink, R.W.: Phys. Rev.118, 242 (1960)
Karras, M., Kantele, J.: Univ. Arkansas, Nucl. Chem. Res., Ann. Progr. Rept, p. 6 (1963)
Kawade, K., Hiei, A., Yamamoto, H., Amemiya, S., Katoh, T.: J. Phys. Soc. Jap.36, 1221 (1974)
Paatero, P., Tuura, E., Siivola, A.: Comm. Phys.-Math.42, 283 (1972)
Paatero, P., Tuura, E., Siivola, A.: Univ. of Helsinki, Report Series in Physics No. A17 (1973)
Raeside, D.E.: Nucl. Instr. Methods87, 7 (1970)
Aubin, G., Barrette, M., Monaro, S.: Nucl. Instr. Methods76, 93 (1969)
Marion, J.B.: Nucl. Data A4, 301 (1968)
Gunnink, R., Meyer, R.A., Niday, J.B., Anderson, R.R.: Nucl. Instr. Methods65, 26 (1968)
Lederer, C.M., Hollander, J.M., Perlman, I.: Table of Isotopes, 6th ed. New York: Wiley 1967
Nuclear Data Sheets11, 549 (1974)
Tuurnala, T., Siivola, A., Jartti, P., Liljavirta, T.: Z. Physik266, 103 (1974)
Nuclear Data Sheets10, 359 (1973)
Katajanheimo, R., Tuurnala, T., Hammarén, E.: To be published
Hager, R.S., Seltzer, E.C.: Nucl. Data A4, 1 (1968)
Blatt, J.M., Weisskopf, V.F.: Theoretical nuclear physics, p. 627. New York: Wiley 1952
Ragnarsson, I., Sobiczewski, A., Sheline, R.K., Larsson, S.E., Nerlo-Pomorska, B.: Nucl. Phys. A233, 329 (1974)
Larsson, S.E.: Private communication
Stelson, P.H., Grodzins, L.: Nucl. Data Al, 21 (1966)
Nilsson, S.G.: Mat. Fyss. Medd. Dan. Vid. Selsk.29, No. 16 (1955)
Mottelson, B.R., Nilsson, S.G.: Mat. Fys. Skr. Dan. Vid. Selsk.1, No. 8 (1959)
Gustafson, C., Lamm, I.L., Nilsson, B., Nilsson, S.G.: Arkiv Fysik36, 613 (1967)
Bunker, M.E., Reich, C.W.: Rev. Mod. Phys.43, 348 (1971)
Nuclear Data Sheets11, 189 (1974)
Bés, D.R., Cho, Yi-chung: Nucl. Phys.86, 851 (1966)
Bunker, M.E., Starner, J.W., Cranston, F.P. Jr.: Bull. Am. Phys. Soc.9, No. 1, 18 (1964)
Author information
Authors and Affiliations
Additional information
We wish to thank Professor Antti Siivola for discussions and critical reading of the manuscript. Two of us (T.T. and E.H.) are indebted to the Emil Aaltonen Foundation for financial support.
Rights and permissions
About this article
Cite this article
Tuurnala, T., Katajanheimo, R. & Hammarén, E. States of167Ho from the decay of neutron rich nuclide167Dy. Z Physik A 280, 309–316 (1977). https://doi.org/10.1007/BF01434358
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF01434358