Elsevier

Nuclear Physics A

Volume 248, Issue 3, 1 September 1975, Pages 406-428
Nuclear Physics A

The coriolis-coupled bands in 231Pa and the decay of 231Th

https://doi.org/10.1016/0375-9474(75)90521-7Get rights and content

Abstract

A re-investigation of the 231Th decay scheme has been performed with magnetic and semiconductor spectrometers. The Q-value of the decay was determined to be Qβ = 389 ±2 keV. For 231Pa the measurements suggest spins and parities of 32+, 32 and 52 for the 318.0, 320.2, and 351.8 keV levels, respectively. Half-lives of 274 ± 10 ps and 45.1 ± 1.3 ns were found for the 58.6 keV (72) and the 84.2 keV (52+) levels. Calculations, in which the Nilsson model was extended to include Coriolis coupling of the i132Orbitals and two N = 4 Orbitals, successfully explain the peculiar structure of the positive-parity rotational bands in 231Pa. From these calculations and from the value of the ground-state quadrupole moment, derived from the rotational transition probability B(E2, 58.6 keV), the deformation parameters were determined to be (ε2, ε4) = (0.164,−0.100).

References (32)

  • M.I. Baznat et al.

    Phys. Lett.

    (1970)
  • M.E. Bunker et al.

    Phys. Lett.

    (1967)
  • J. Borggreen et al.

    Nucl. Phys.

    (1969)
  • S.A. Hjorth et al.

    Nucl. Phys.

    (1970)
  • G. Løvhøiden et al.

    Nucl. Phys.

    (1970)
  • S.A. Hjorth et al.

    Nucl. Phys.

    (1972)
  • P. Kleinheinz et al.

    Nucl. Phys.

    (1973)
  • G. Løvhøiden et al.

    Nucl. Phys.

    (1972)
  • A. Artna-Cohen

    Nucl. Data

    (1971)
  • J.T. Routti et al.

    Nucl. Instr.

    (1969)
  • A. Plochocki et al.

    Nucl. Instr.

    (1971)
  • R.S. Hager et al.

    Nucl. Data

    (1968)
  • O. Dragoun et al.

    Nucl. Data

    (1971)
  • J. Godart et al.

    Nucl. Phys.

    (1973)
  • L. Boström et al.

    Nucl. Instr.

    (1966)
  • K.E.G. Löbner et al.

    Nucl. Data

    (1970)
  • Cited by (21)

    • Nuclear Data Sheets for A = 231

      2013, Nuclear Data Sheets
    • Measurement of gamma-ray intensities of <sup>231</sup>Th using semiconductor detectors

      1999, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
    View all citing articles on Scopus
    View full text