6533b824fe1ef96bd1281362

RESEARCH PRODUCT

Resonance ionization spectroscopy in a buffer gas cell with radioactive decay detection, demonstrated usingTl208

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description

An ultrasensitive laser spectroscopic method has been developed to perform hyperfine spectroscopy of heavy-ion-induced reaction products. It is based on resonance ionization in a buffer gas cell combined with radioactive decay detection. The feasibility has been demonstrated using the \ensuremath{\beta}-active ${\mathrm{isotope}}^{208}$ Tl. A sensitivity of 1.3\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}3}$ of the two-step resonance-ionization process via the n=17 Rydberg level has been determined, utilizing a pulsed excimer-dye-laser combination. The previously unknown nuclear magnetic moment \ensuremath{\mu}${(}^{208}$Tl) = 0.292(13)${\mathrm{\ensuremath{\mu}}}_{\mathit{n}}$ (${\mathrm{\ensuremath{\mu}}}_{\mathit{n}}$ is the nuclear magneton) and a rms radius difference between $^{208}\mathrm{Tl}$ and $^{207}\mathrm{Tl}$ of \ensuremath{\delta}〈${\mathit{r}}^{2}$〉=0.099(15) ${\mathrm{fm}}^{2}$ were deduced from the 6p $^{2}$${\mathit{P}}_{1/2}$--7s $^{2}$${\mathit{S}}_{1/2}$ transition.