Zhenhua, Zhang | Search NASA

DOE OSTI2011

QCD factorization for {Lambda}{sub b}{sup 0}{yields}{Lambda}{sub c}{sup +}{pi}{sup -}

We prove that in the limit m{sub b},m{sub c}{yields}{infinity}, with m{sub c}/m{sub b} fixed, factorization holds at order {alpha}{sub s} for the decay {Lambda}{sub b}{sup 0}{yields}{Lambda}{sub c}{sup +}{pi}{sup -}. This proof is done in the infinite-momentum frame in which the momenta of {pi}, {Lambda}{sub c}, and {Lambda}{sub b} go to infinity. Our result is renormalization-scale- and scheme-independent at O({alpha}{sub s}). This is the same as the QCD factorization for B{yields}D{pi}.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗

DOE OSTI2011

Particle-number conserving analysis of rotational bands in {sup 247,249}Cm and {sup 249}Cf

The recently observed high-spin rotational bands in odd-A nuclei {sup 247,249}Cm and {sup 249}Cf[Tandel et al., Phys. Rev. C 82, 041301(R) (2010)] are investigated by using the cranked-shell model (CSM) with the pairing correlations treated by a particle-number conserving (PNC) method in which the blocking effects are taken into account exactly. The experimental moments of inertia and alignments and their variations with the rotational frequency {omega} are reproduced very well by the PNC-CSM calculations. By examining the {omega} dependence of the occupation probability of each cranked Nilsson orbital near the Fermi surface and the contributions of valence orbitals to the angular momentum alignment in each major shell, the level crossing and upbending mechanism in each nucleus is understood clearly.

73 NUCLEAR PHYSICS AND RADIATION PHYSICS↗