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We present microscopic calculations of light and medium mass nuclei and the equation of state of symmetric and asymmetric nuclear matter using different nucleon-nucleon interactions, including a new Argonne version that has the same spin-isospin structure as local chiral forces at next-to-next-to-leading order. The calculations are performed using auxiliary field diffusion Monte Carlo (AFDMC) combined with an improved variational wave function and sampling technique. The AFDMC method can now be used to successfully calculate the energies of very light to medium mass nuclei as well as the energy of isospin-asymmetric nuclear matter, demonstrating microscopically the quadratic dependence of the energy ...

Contributors
Gandolfi, S., Lovato, A., Carlson, J., et al.
Created Date
2014-12-29

Exclusive neutral-pion electroproduction (ep → e[superscript ′]p[superscript ′]π[superscript 0]) was measured at Jefferson Lab with a 5.75-GeV electron beam and the CLAS detector. Differential cross sections d[superscript 4]σ/dtdQ[superscript 2]dx[subscript B]dϕ[subscript π] and structure functions σ[subscript T] + εσ[subscript L], σ[subscript TT], and σ[subscript LT] as functions of t were obtained over a wide range of Q[superscript 2] and x[subscript B]. The data are compared with Regge and handbag theoretical calculations. Analyses in both frameworks find that a large dominance of transverse processes is necessary to explain the experimental results. For the Regge analysis it is found that the inclusion of ...

Contributors
Bedlinskiy, I., Kubarovsky, V., Niccolai, S., et al.
Created Date
2014-08-13

High-statistics measurements of differential cross sections and spin density matrix elements for the reaction γp → ϕp have been made using the CLAS detector at Jefferson Lab. We cover center-of-mass energies (√s) from 1.97 to 2.84 GeV, with an extensive coverage in the ϕ production angle. The high statistics of the data sample made it necessary to carefully account for the interplay between the ϕ natural lineshape and effects of the detector resolution, that are found to be comparable in magnitude. We study both the charged- (ϕ → K[superscript +]K[superscript −]) and neutral- (ϕ → K[0 over S]K[0 over L]) ...

Contributors
Dey, B., Meyer, C. A., Bellis, M., et al.
Created Date
2014-05-27