α decay of the new isotopes<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Rn</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>193</mml:mn><mml:mo>,</mml:mo><mml:mn>194</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>
Аннотация
The new neutron-deficient isotopes $^{193,194}\mathrm{Rn}$ have been identified in the complete fusion reaction $^{52}\mathrm{Cr}+^{144}\mathrm{Sm}$$\ensuremath{\rightarrow}$$^{196}\mathrm{Rn}$${}^{*}$ at the velocity filter SHIP. The \ensuremath{\alpha}-decay energy and half-life value of $^{194}\mathrm{Rn}$ were determined to be ${E}_{\ensuremath{\alpha}}=7700(10)$ keV and ${T}_{1/2}=0.78(16)$ ms, respectively. For $^{193}\mathrm{Rn}$ the half-life of ${T}_{1/2}=1.15(27)$ ms and two \ensuremath{\alpha} lines at ${E}_{\ensuremath{\alpha}1}=7685(15)$ keV, ${I}_{\ensuremath{\alpha}1}=74(20)%$ and ${E}_{\ensuremath{\alpha}2}=7875(20)$ keV, ${I}_{\ensuremath{\alpha}2}=26(12)%$ were found. The decay pattern of $^{193}\mathrm{Rn}$, which is substantially different from that of the heavier odd-$A$ Rn isotopes, provides first experimental evidence for the long-predicted deformation in the very neutron-deficient Rn nuclei.