Portal de Periódicos da CAPES

Enhanced Electron-Capture Decay Rate of B 7 e Encapsulated in C 60 </mml:msub…

2004; American Physical Society; Volume: 93; Issue: 11 Linguagem: Inglês

10.1103/physrevlett.93.112501

1092-0145

T. Ohtsuki, Heimei Yuki, M. Muto, J. Kasagi, Kaoru Ohno,

Carbon Nanotubes in Composites

The decay rate of $^{\mathrm{7}}\mathrm{B}\mathrm{e}$ electron capture was measured in ${\mathrm{C}}_{60}$ and Be metal with a reference method. The half-life of $^{\mathrm{7}}\mathrm{B}\mathrm{e}$ endohedral ${\mathrm{C}}_{\mathrm{60}}$ ($^{\mathrm{7}}\mathrm{B}\mathrm{e}\mathrm{@}{\mathrm{C}}_{\mathrm{60}}$) and $^{\mathrm{7}}\mathrm{B}\mathrm{e}$ in Be metal (Be metal ($^{\mathrm{7}}\mathrm{B}\mathrm{e}$)) is found to be $52.68\ifmmode\pm\else\textpm\fi{}0.05$ and $53.12\ifmmode\pm\else\textpm\fi{}0.05$ days, respectively. This amounts to a $0.83%$ difference in electron-capture decay half-life between $^{\mathrm{7}}\mathrm{B}\mathrm{e}@{\mathrm{C}}_{60}$ and Be metal ($^{\mathrm{7}}\mathrm{B}\mathrm{e}$). Our result is a reflection of the different electron wave functions for $^{\mathrm{7}}\mathrm{B}\mathrm{e}@{\mathrm{C}}_{60}$ inside ${\mathrm{C}}_{\mathrm{60}}$ compared to the situation when $^{\mathrm{7}}\mathrm{B}\mathrm{e}$ is in a Be metal.