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"The reaction 9Be(3He,a)8Be* -+ a + a has been studied at
incident beam energies of 27.4 and 27.8 MeV. Two solid-state
detectors were mounted in the reaction plane and set at such
angles that the peak corresponding to the 9Be(3He,a)8Be(E . = excLt.
11.4 MeV) and the peak due to 8 Be(E .t = 11.4 MeV) -+ 2a, as
eXCL.
seen in a given detecto~ were superimposed over a wide angular
range. The results show that for Ep = 27.8 MeV, 91 = 77°,
92 = 60° and for Ep = 27.4 MeV,91 = 80°, 92 = 59°, there is
order-of-emission destructive interference, where a peak due
to the superimposition of the two closely spaced peaks is
expected. Assuming no interference is present the width of
the 11. 4 MeV level of 8 Be""* as deduced from the separation of
the two peaks, is less than 2.5 MeV, a value which is
considerably smaller than the known width of 4.0 MeV. On the
other han4 using coherent addition of two Breit-Wigner line
shapes characterized by widths of 4.0 MeV, one can predict a dip
between the two peaks that is in qualitative agreement with the
experimental data."
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