Evidence for a Nuclear Tensor Force from Mass-14 Beta- and Gamma-Ray Data

H. J. ROSE; O. HÄUSSER; E. K. WARBURTON

doi:10.1103/RevModPhys.40.591

Evidence for a Nuclear Tensor Force from Mass-14 Beta- and Gamma-Ray Data

H. J. ROSE, O. HÄUSSER, and E. K. WARBURTON

Rev. Mod. Phys. 40, 591 – Published 1 July 1968

Abstract

The role of beta- and gamma-ray matrix elements in the determination of wave functions for the $s^{4} p^{10}$ states of mass 14 is examined. The data considered include the Gamow-Teller (beta) matrix elements of ${}^{14}C$ and ${}^{14}O$ and the $M 1$ and $E 2$ matrix elements connecting the lowest four $s^{4} p^{10}$ states of ${}^{14}N$ . The magnetic moment of ${}^{14}N$ is also discussed. The shell-model wave functions considered arise mainly from the $s^{4} p^{10}$ configuration but include admixtures of the $s^{4} p^{8}$ ( $2 s, 1 d$ ) configuration. It is found that the data, considered as a whole, cannot be explained if the $s^{4} p^{10}$ components of the wave functions are derived from a central plus spin-orbit interaction only, but that quite satisfactory agreement is obtained if the nuclear force includes a tensor part. The bulk of the cancellation of the ${}^{14}C$ beta decay matrix element takes place within the $s^{4} p^{10}$ configuration. In general, configuration mixing is of secondary importance; its most noticeable effect is on the $M 1$ decay of the first-excited state of ${}^{14}N$ .

DOI:https://doi.org/10.1103/RevModPhys.40.591

Authors & Affiliations

H. J. ROSE and O. HÄUSSER^*

Nuclear Physics Laboratory, University of Oxford, England

E. K. WARBURTON^†,‡

Brookhaven National Laboratory, Upton, New York

^*NATO Postdoctoral Science Fellow 1965-66, now at Atomic Energy of Canada Limited, Chalk River, Ontario, Canada.
^†Part of this work was done at the Nuclear Physics Laboratory, Oxford, in 1963/4 under the auspices of a National Science Foundation senior postdoctoral fellowship.
^‡Work performed under the asupices of the U.S. Atomic Energy Commission.