Abstract
The experimental large fluctuation in odd-even differences in moments ofinertia of deformed actinide nuclei is investigated using the particle-numberconserving (PNC) method for treating the cranked shell model with monopole andquadrupole pairing interactions. PNC calculations show that the large odd-evendifference in moments of inertia mainly comes from the interferencecontributions j(μν) from particles in high j intruder orbitals μand ν quite near the Fermi surface, which have no counterpart in the BCSformalism. The effective monopole and quadrupole pairing interaction strengthsare determined to fit the experimental odd-even differences in bindingenergies and bandhead moments of inertia. The experimental results for thevariation of moments of inertia with rotational frequency ω arereproduced well by the PNC calculation. The nearly identical experimentalmoments of inertia between 236U(gsb) and 238U(gsb) at lowfrequencies ℏω⩽0.20 MeV are also reproduced quite well.
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