Microscopic Mechanism of Large Fluctuation in Odd-Even Differences in Moments of Inertia for Actinide Nuclei

The experimental large fluctuation in odd-even differences in moments of inertia of deformed actinide nucleiis investigated using the particle-number conserving（PNC）method for treating the cranked shell model with monopoleand quadrupole pairing interactions.PNC calculations show that the large odd-even difference in moments of inertiamainly comes from the interference contributions j（μv）from particles in high j intruder orbitals μ and v quite nearthe Fermi surface,which have no counterpart in the BCS formalism.The effective monopole and quadrupole pairinginteraction strengths are determined to fit the experimental odd-even differences in binding energies and bandheadmoments of inertia.The experimental results for the variation of moments of inertia with rotational frequency ω arereproduced well by the PNC calculation.The nearly identical experimental moments of inertia between;U（gsb）and;U（gsb）at low frequencies hω0.20 MeV are also reproduced quite well.