Mössbauer Effect in Tungsten Following Coulomb Excitation

Simultaneous Mössbauer-effect spectra of the first excited states of ${\mathrm{W}}^{182}$, ${\mathrm{W}}^{184}$, and ${\mathrm{W}}^{186}$ were observed following Coulomb excitation by 6.0-MeV $\alpha$ particles. Tungsten nuclei were in tungsten metal targets at liquid-nitrogen temperature. An absorption spectrum of the first excited state of ${\mathrm{W}}^{183}$ was also observed. Taking the half-life of the first excited state of ${\mathrm{W}}^{182}$ to be 1.377±0.014 nsec, the half-lives of the first excited states of ${\mathrm{W}}^{184}$, ${\mathrm{W}}^{186}$, and ${\mathrm{W}}^{183}$ were determined to be 1.28±0.13, 1.38±0.12, and 0.174±0.006 nsec, respectively. Data were consistent with electric quadrupole interactions in the targets. The Debye temperature of tungsten metal at liquid-nitrogen temperature was determined to be 329±8°K.