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Direct observation of 4+ to 2+ gamma transition in 8Be | | V.M. Datar
; Suresh Kumar
; D.R. Chakrabarty
; V. Nanal
; E.T. Mirgule
; A. Mitra
; H.H. Oza
; | | Date: |
28 Sep 2004 | | Journal: | Erratum-ibid. 94 (2005) 139902 | | Subject: | nucl-ex | | Abstract: | 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. | | Source: | arXiv, nucl-ex/0409025 | | Services: | Forum | Review | PDF | Favorites | |
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