142 research outputs found
Direct observation of 4+ to 2+ gamma transition in 8Be
The low lying states in 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 and a resonant radiative cross section of 134 nb for
the entrance channel. We report here the first experimental
evidence for this transition through a coincidence
measurement in the reaction He()He using a gas
target. The measured cross sections on and off the 4 resonance are 165
41 (stat) 35 (sys) nb and 39 25 (stat) 7 (sys) nb,
respectively.Comment: Total 4 pages, 4 figures, in RevTeX format, submitted to PR
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