Partial Dynamical Symmetry in the Symplectic Shell Model

We present an example of a partial dynamical symmetry (PDS) in an interacting fermion system and demonstrate the close relationship of the associated Hamiltonians with a realistic quadrupole-quadrupole interaction, thus shedding new light on this important interaction. Specifically, in the framework of the symplectic shell model of nuclei, we prove the existence of a family of fermionic Hamiltonians with partial SU(3) symmetry. We outline the construction process for the PDS eigenstates with good symmetry and give analytic expressions for the energies of these states and E2 transition strengths between them. Characteristics of both pure and mixed-symmetry PDS eigenstates are discussed and the resulting spectra and transition strengths are compared to those of real nuclei. The PDS concept is shown to be relevant to the description of prolate, oblate, as well as triaxially deformed nuclei. Similarities and differences between the fermion case and the previously established partial SU(3) symmetry in the Interacting Boson Model are considered.Comment: 9 figure

Loan officers and loan 'delinquency' in microfinance: A Zambian case

The paper seeks to promote greater understanding of the importance of loan officers in group-based microfinance by explaining their actual roles, dilemmas and tensions when working with poor clients. Few existing studies have used data outside Bangladesh and most focus upon relatively well-performing institutions. Using data from Zambia this study focuses on the recent crisis of Christian Enterprise Trust of Zambia (CETZAM) and the effects of its practices for accounting for and dealing with defaulters. The findings firstly show that loan officers faced powerful hierarchical accountability pressures and pursued inappropriate methods to compel further repayments to resolve this crisis. Its approach to borrower default was found to be stressful for loan officers and potentially detrimental for CETZAM's own short and long-term survival by reducing client loyalty and trust