Abstract
A high-efficiency coincidence method for Coulomb excitation studies is presented. In the experimental arrangement described, the target is placed very close to a large coaxial Ge(Li) detector, and both are surrounded by a large NaI(Tl) annular detector. In studies of even-even nuclei the 2 1 + → 0 1 + transition is detected by the NaI(Tl) annulus and the coincident transitions as well as the singles spectrum are recorded by the Ge(Li) detector. Due to the large solid angle subtended by the NaI(Tl) annulus, angular correlation effects in the coincidence counting rate are practically completely smeared out. Consequently, the method can easily be applied, e.g., to studies of weakly populated vibration-like levels, which is demonstrated in test measurements of 112, 114Cd and 118Sn. The accuracy of the method in determining excitation cross sections relative to that of the 2 1 + level is in favourable cases about 15%.
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