Study of the Levels in La140 by (d,p) Stripping Reaction

Jean Kern, Gordon L. Struble, and Raymond K. Sheline
Phys. Rev. 153, 1331 – Published 20 January 1967
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Abstract

The energy levels in La140 were studied by means of (d,p) reaction spectroscopy using 10-MeV deuterons. The protons that emerged were analyzed by a single-gap, broad-range magnetic spectrograph with 13-keV resolution. We obtained the reaction Q value of 2938±3 keV. Exposures were taken at eight angles ranging from 25° to 105°. All spectra were fitted, using a least-squares code, up to an excitation energy of 1860 keV. Seventy states were observed and the angular distributions of the most prominent groups were analyzed by means of distorted-wave Born-approximation stripping theory. Spins of the La140 levels determined from previous decay-scheme studies and the present research, and the proton intensities observed in the La139(d,p) La140 reaction, can be satisfactorily explained in terms of the mixed configurations, (1g72)p(2f72)n and (2d52)p(2f72)n. Above 600 keV, however, interpretation of states in terms of higher energy configurations appears also to require phonon-particle coupling.

  • Received 13 June 1966

DOI:https://doi.org/10.1103/PhysRev.153.1331

©1967 American Physical Society

Authors & Affiliations

Jean Kern*, Gordon L. Struble, and Raymond K. Sheline

  • Departments of Chemistry and Physics, Florida State University, Tallahassee, Florida
  • Department of Chemistry and Lawrence Radiation Laboratory, University of California, Berkeley, California

  • *Present address: Physics Department, University of Fribourg, Fribourg, Switzerland.

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Issue

Vol. 153, Iss. 4 — January 1967

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