Study of the Levels in La140 Using the La139(n, γ)La140 Reaction

E. T. Jurney, R. K. Sheline, E. B. Shera, H. R. Koch, B. P. K. Maier, U. Gruber, H. Baader, D. Breitig, O. W. B. Schult, Jean Kern, and Gordon L. Struble
Phys. Rev. C 2, 2323 – Published 1 December 1970
PDFExport Citation

Abstract

The levels in La140 have been studied following thermal-neutron capture in La139 using Ge(Li), Si(Li), curved-crystal, and coincidence spectrometers. The neutron binding energy of La140 was determined as 5161.1±1.0 keV. The data, when combined with the previous La139(d, p)La140 study, allow the assignment of the first 14 states up to 581.060 keV to the mixed configurations πg72νf72 and πd52νf72. The energies of states in keV (spin parity) are: 0 (3), 29.965 (2), 34.656 (5), 43.811 (1), 48.865 (6), 63.171 (4), 103.803 (6), 162.656 (2), 272.311 (4), 284.634 (7), 318.214 (3), 322.003 (5), 467.505 (1), 581.060 (0). Comparisons of γ-ray branching ratios and (d, p) cross sections with the predictions of a quasiparticle model for odd-odd nuclei allow a relatively uncompromised solution for the state vectors for the first 14 states. The success of this model implies that there is little phonon or four-quasiparticle admixture through the level at 581.060 keV. A detailed experimental study of additional levels up to 1055 keV has been performed.

  • Received 13 July 1970

DOI:https://doi.org/10.1103/PhysRevC.2.2323

©1970 American Physical Society

Authors & Affiliations

E. T. Jurney, R. K. Sheline*, and E. B. Shera

  • University of California, Los Alamos Scientific Laboratory, Los Alamos, New Mexico 87544

H. R. Koch, B. P. K. Maier, U. Gruber, H. Baader, D. Breitig, and O. W. B. Schult

  • Technical University, Munich, Germany, and Research Establishment of the Danish Atomic Energy Commission, Risø, Roskilde, Denmark

Jean Kern

  • Physics Department, University of Fribourg, Fribourg, Switzerland

Gordon L. Struble

  • Chemistry Department, University of California, Berkeley, California 94720

  • *Permanent address: Florida State University, Tallahassee, Florida 32306.

References (Subscription Required)

Click to Expand
Issue

Vol. 2, Iss. 6 — December 1970

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review C

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×