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4 papers · 1 filter
Effective Lagrangian Approach to pion photoproduction from the nucleon
C. Fernandez-Ramirez, E. Moya de Guerra, J. M. Udias
We present a pion photoproduction model on the free nucleon based on an Effective Lagrangian Approach (ELA) which includes the nucleon resonances (, N(1440), N(1520), N(15…
Continuous unitary transformations in two-level boson systems
S. Dusuel, J. Vidal, J. M. Arias +2
Two-level boson systems displaying a quantum phase transition from a spherical (symmetric) to a deformed (broken) phase are studied. A formalism to diagonalize Hamiltonians with $O…
Finite-size scaling exponents in the interacting boson model
S. Dusuel, J. Vidal, J. M. Arias +2
We investigate the finite-size scaling exponents for the critical point at the shape phase transition from U(5) (spherical) to O(6) (deformed -unstable) dynamical symmetries of…
Expressions for the number of J=0 pairs in even-even Ti isotopes
L. Zamick, A. Escuderos, S. J. Lee +4
We count the number of pairs in the single j-shell model of {44}Ti for various interactions. For a state of total angular momentum I, the wave function can be written in terms of t…