Hello, A yearly allocation for the LCRC cluster has been requested with the following updated information: Submitter/PI: Robert Wiringa Project Name: qmc_for_nuclei Division: PHY Project title: Quantum Monte Carlo Calculations of Light Nuclei Associated funding: DOE Office of Nuclear Physics Other Systems: ANL Blue Gene/P (INCITE 30M hours for 12C studies) Science: This project uses Quantum Monte Carlo [Green's function (GFMC), variational (VMC), and auxiliary-field diffusion (AFDMC)] methods to compute ground-state and low-lying excited-state expectation values of energies, densities, electroweak transitions, spectroscopic overlaps, astrophysical reaction rates, etc., for light nuclei and low-energy scattering reactions involving these nuclei. Realistic two- and three-nucleon potentials are used. Our goal is a description of all of these systems using a Hamiltonian that also provides an excellent description of nucleon-nucleon scattering and nucleonic matter. Such a `standard nuclear model' can then be used, for example, to compute low-energy astrophysical reactions which cannot be experimentally measured. We are also actively engaged in making predictions that can and are being tested at experimental facilities such as ATLAS, NSCL, TRIUMF, and JLab. Project description: A) Electroweak moments and transitions We are studying a variety of electroweak properties and transitions in light p-shell nuclei, including both one- and two-body charge and current operators that include the effect of meson-exchange currents. We are nearing completion of work on electromagnetic transitions in 8Be and have started calculations for moments and M1 and M3 transitions in A=10 nuclei. We are also studying transitions in A=8 nuclei in co-operation with experimentalists in Mumbai and in A=10 with an experimental group at ATLAS, and finding they may provide new constraints on three-nucleon forces. We have started work on longitudinal and transverse response functions, which have not previously been studied for A>7 nuclei. We expect to use 120,000 core hours for this work in FY14. B) A=11,12 nuclei Extensive effort has gone into GFMC calculations of 0+ states in 12C using Intrepid and Mira, but only a few exploratory calculations of other A>10 nuclei have been made. We have some simple initial trial functions for 11Li and 11B, but other cases like 11Be and 12Be remain to be studied, particularly wave functions that are "clusterized." The VMC codes for these trial functions are running more efficiently from using a mix of OpenMP inside nodes (and benefitting from the larger memory within a Blues node) and MPI between nodes. We are also continuing studies of unnatural parity and intruder states in A=10 nuclei. We would like 120,000 cpu hours for this work in FY14. C) Asymptotic normalization coefficients and resonance widths for alpha-decay In the last few years we have developed a new method for evaluating asymptotic normalization coefficients (ANCs) that characterize the long-range tails of nuclear bound states and are the key determinant in low-energy astrophysics reaction rates. The calculation uses a short-range integral technique that can make do with relatively simple variational wave functions. A variant of this method allows the calculation of widths of narrow unbound states. The method has been applied to single-nucleon emission up to A=9 nuclei. We are adapting the method for alpha-particle emission and plan to study ANCs and widths nuclei up to A=10. We will need 40,000 hours for this work in FY14. D) Nucleon momentum distributions in A<=12 nuclei We have developed algorithms for evaluating one- and two-nucleon momentum distributions in nuclei using variational wave functions. These have often been requested by groups at JLab, both for analyzing past experiments and planning new ones. We wish to extend these calculations to the two-nucleon momentum distributions in 12C, which are relevant to recent two-nucleon knockout experiments, and to try incorporating the more exact GFMC wave functions. We would like 40,000 core hours for this work in FY14. E) Euclidean response of nuclei We are adding the ability to compute electromagnetic and neutral-current Euclidean response to the GFMC code. The code development is being done on Blues and production calculations for 4He will also be done there. Production for 12C will be done on Mira. The latter is of great interest for neutrio scattering in detectors and supernovae. This work should need 10,000 hours and will mostly be done in the first two quarters. Project URL: http://www.phy.anl.gov/theory/research/forces.html Current FY Hours Used: undetermined amount New FY Requested allocation: 330000 Q1: 85000 Q2: 85000 Q3: 80000 Q4: 80000 Justification: Thank You, The LCRC Accounts System