Lifetimes of rotational states in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Th</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>232</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span>

Noah R. Johnson; R. J. Sturm; E. Eichler; M. W. Guidry; G. D. O'Kelley; R. O. Sayer; D. C. Hensley; N. C. Singhal; J. H. Hamilton

doi:10.1103/PhysRevC.12.1927

Lifetimes of rotational states in ${}^{232}{Th}$

Noah R. Johnson, R. J. Sturm, E. Eichler, M. W. Guidry, G. D. O'Kelley, R. O. Sayer, D. C. Hensley, N. C. Singhal, and J. H. Hamilton

Phys. Rev. C 12, 1927 – Published 1 December 1975

Abstract

Lifetimes of the $4^{+}$ through $10^{+}$ members of the ground-state rotational band in ${}^{232}{Th}$ have been measured by the Doppler-shift recoil-distance technique. These states were Coulomb excited by 152-MeV ${}^{40}{Ar}$ ions, and measurements were carried out in coincidence with the backscattered projectiles. The half-lives for the $4^{+}$ through $10^{+}$ states are 164 ± 13, 66.2 ± 5.1, 25.1 ± 2.3, and 11.2 ± 1.7 ps, respectively. The $B (E 2)$ values deduced for these states are systematically about 10% smaller than rigid-rotor values; however, the constancy of the transition quadrupole moments is interpreted as an indication of rotational behavior.

NUCLEAR REACTIONS ${}^{232}{Th} ({}^{40}{Ar}, {}^{40}{Ar}^{'}, γ)$ , $E = 152$ MeV; measured life-times $4^{+}$ , $6^{+}$ , $8^{+}$ , and $10^{+}$ members g.s. band ${}^{232}{Th}$ ; deduced $B (E 2)$ values, compared with theory.

Received 2 June 1975

DOI:https://doi.org/10.1103/PhysRevC.12.1927

Authors & Affiliations

Noah R. Johnson, R. J. Sturm^*, E. Eichler, M. W. Guidry^†, G. D. O'Kelley, R. O. Sayer^‡, and D. C. Hensley

Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830

N. C. Singhal and J. H. Hamilton^§

Physics Department, Vanderbilt University, Nashville, Tennessee 37235

^*Max Kade Foundation Fellow from the University of Marburg, Marburg, Germany.
^†Oak Ridge Graduate Fellow from the University of Tennessee under appointment with Oak Ridge Associated Universities. Present address: Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720.
^‡Supported jointly by Oak Ridge National Laboratory and Vanderbilt University.
^§Work supported in part by grants from the National Science Foundation.

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Vol. 12, Iss. 6 — December 1975

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