Abstract
A new isomeric state in237Np has been discovered at an excitation energy of (945.3±0.2) keV withT 1/2 =(711±40) ns. Six gamma-ray lines have been measured depopulating the isomeric state to known levels in237Np. The comparison of the measured absolute gamma-ray transition probabilities with empirical values yields as most probable spinI andK assignmentI=K=13/2 for this isomeric state. It is most likely a 1-proton-2-neutron quasiparticle state 13/2−π5/2+ [642] +ν7/2− [743] + ν 1/2+ [631]. However, a one-quasiparticle 11/2− [505] configuration for the isomer cannot be excluded.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Minor, M.M.: Nucl. Data Sheets18, 331 (1976)
Ellis, Y.A., Harmatz, B.: Nucl. Data Sheets16, 135 (1975)
Browne, E.: Nucl. Data Sheets55, 483 (1988)
Firestone, R.B.: Nucl. Data Sheets43, 289 (1984)
Firestone, R.B.: Nucl. Data Sheets52, 715 (1987)
Steinmayer, M., Löbner, K.E.G., Corradi, L., Lenz, U., Pascholati, P.R., Quade, U., Rudolph, K., Schomburg, W.K., Skorka, S.J.: Proceedings of the International Conference on Spectroscopy of Heavy Nuclei, Crete, Greece, 25 June–1 July 1989. Institute of Physics Conference Series 105. Sharpey-Schafer, J.F., Skouras, L. (eds.) (to be published)
Steinmayer, M.: Thesis, University of Munich, 1987
Steinmayer, M., Löbner, K.E.G., Corradi, L., Lenz, U., Pascholati, P.R., Quade, U., Rudolph, K., Schomburg, W.K., Skorka, S.J.: (to be published)
Ellis-Akovali, Y.A.: Nucl. Data Sheets49, 181 (1986)
Alaga, G., Alder, K., Bohr, A., Mottelson, B.: Mat. Fys. Medd. Dan. Vid. Selsk.29 (1955)
Hager, R.S., Seltzer, E.C.: Nucl. Data Tables A4, 1 (1968)
Löbner, K.E.G.: Phys. Letters26B, 369 (1968)
Löbner, K.E.G.: Gamma-ray transition probabilities in deformed nuclei. In: The electromagnetic interaction in nuclear spectroscopy. Hamilton, W.D. (ed.). Amsterdam: North-Holland 1975
Gustafson, C., Lamm, I.L., Nilsson, B., Nilsson, S.G.: Ark. Fys.36, 617 (1967)
Schmorak, M.R.: Nucl. Data Sheets40, 1 (1983)
Bohr, A., Mottelson, B.R.: Nuclear structure. Vol. 1, p. 170. New York, Amsterdam: Benjamin 1969
Author information
Authors and Affiliations
Additional information
We would like to thank the personnel of the Tandem accelerator, the target lab, the mechanic and electronic shop and the computer group for their support. This work has been funded by the German Federal Minister for Research and Technology (BMFT) under the contract number 06LM177.
Rights and permissions
About this article
Cite this article
Steinmayer, M., Löbner, K.E.G., Corradi, L. et al. Isomeric state at 945.3 keV in237Np. Z. Physik A - Atomic Nuclei 337, 371–375 (1990). https://doi.org/10.1007/BF01294973
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF01294973