Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2004-09-28
Phys.Rev.Lett. 94 (2005) 122502; Erratum-ibid. 94 (2005) 139902
Physics
Nuclear Physics
Nuclear Experiment
Total 4 pages, 4 figures, in RevTeX format, submitted to PRL
Scientific paper
10.1103/PhysRevLett.94.122502
The low lying states in $^8$Be are believed to have a two-alpha cluster structure and hence a large intrinsic quadrupole deformation. An earlier calculation showed a large collective enhancement in gamma transition probability between the low lying states leading to a 4$^+$ to 2$^+$ gamma branch of $\sim10^{-7}$ and a resonant radiative cross section of 134 nb for the $\alpha+\alpha$ entrance channel. We report here the first experimental evidence for this transition through a $\gamma-\alpha-\alpha$ coincidence measurement in the reaction $^4$He($\alpha,\alpha \gamma$)$^4$He using a gas target. The measured cross sections on and off the 4$^+$ resonance are 165 $\pm$ 41 (stat) $\pm$35 (sys) nb and 39 $\pm$ 25 (stat) $\pm$7 (sys) nb, respectively.
Chakrabarty D. R.
Datar V. M.
Kumar Suresh
Mirgule E. T.
Mitra Aditi
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