Abstract
The neutron capture cross section of the unstable nucleus Re-186 is
studied by investigating the inverse photodisintegration reaction
Re-187(gamma, n). The special interest of the s-process branching point
Re-186 is related to the question of possible s-process contributions to
the abundance of the r-process chronometer nucleus Re-187. We use the
photoactivation technique to measure photodisintegration rates. Our
experimental results are in good agreement with two different
statistical model calculations. Although the cross sections predicted by
both models for the inverse reaction Re-186(n, gamma) is too low to
remove the overproduction of Os-186; the two predicted neutron-capture
cross sections differ by a factor of 2.4; this calls for future
theoretical study.
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