25,637 research outputs found
Exact Partition Function and Boundary State of Critical Ising Model with Boundary Magnetic Field
We compute the exact partition function of the 2D Ising Model at critical
temperature but with nonzero magnetic field at the boundary. The model
describes a renormalization group flow between the free and fixed conformal
boundary conditions in the space of boundary interactions. For this flow the
universal ground state degeneracy and the full boundary state is computed
exactly.Comment: Two lines in the Introduction and three references adde
Beam energy dependence of Coulomb-nuclear interference in the breakup of 11Be
Within the post-form distorted wave Born approximation wherein pure Coulomb,
pure nuclear and their interference terms are treated consistently in a single
setup we study the beam energy dependence of the Coulomb-nuclear interference
terms in the breakup of 11Be on a medium mass 44Ti target. Our results suggest
that the Coulomb-nuclear interference terms are dependent on the incident beam
energy and can be as big as that of the individual Coulomb or nuclear terms
depending on the angle and energy of the breakup fragments. We also calculate
the relative energy spectra and one-neutron removal cross sections in the
breakup of 11Be on a heavy 208Pb target at 69 MeV/nucleon for two different
angular ranges of the projectile center of the mass scattering angle and
compare them with recently available experimental data.Comment: 17 pages latex, 4 figure
Local Magnetization in Critical Ising Model with Boundary Magnetic Field
We discribe a simple way to derive spin correlation functions in 2D Ising
model at critical temperature but with nonzero magnetic field at the boundary.
Local magnetization (i.e. one-point function) is computed explicitly for
half-plane and disk geometries.Comment: 8 pages, RU-93-5
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