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), cluster VMC, and auxiliary-field diffusion (AFDMC)] methods to compute ground-state and low-lying excited-state expectation values of energies, densities, electroweak transitions and response, spectroscopic overlaps, etc., for light- and medium-mass 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 recently completed work on electromagnetic transitions in 8Be and have started calculations for moments and M1 and M3 transitions in A=10 nuclei. We also working to determine the nuclear magnetic radii, including the effect of two-body currents. This work is supporting experiments at ATLAS and TRIUMF. We plan to evaluate weak decays in A=8,9 this year. We expect to use 100,000 core hours for this work in FY15. 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 made some progress on trial functions for 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 efficiently using a mix of OpenMP inside nodes and MPI between nodes. We are also continuing studies of unnatural parity and intruder states in A=9,10 nuclei. We would like 100,000 cpu hours for this work in FY15. 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 have laid the groundwork for alpha-particle emission and plan to study alpha ANCs and widths nuclei up to A=10. We will need 40,000 hours for this work in FY15. D) Nucleon momentum distributions in A<=12 nuclei We have made extensive evaluations of one- and two-nucleon momentum distributions in nuclei using variational wave functions and posted results on the web. These have been used by groups at JLab, both for analyzing past experiments and planning new ones. Additional calculations for two-nucleon distributions in 4He at many angles and for 12C in general have been requested. We would like 40,000 core hours for this work in FY15. E) Euclidean response of nuclei We have added the ability to compute electromagnetic and neutral-current Euclidean response to the GFMC code. The code development was done on Blues and production calculations for 4He continue to be done there. Production for 12C is being done on Mira. The latter is of great interest for neutrio scattering in detectors and supernovae. In the next FY we will be working on charged current response calculations which will again first be developed on Blues. This work should need 20,000 hours. F) Cluster VMC for medium-mass nuclei We are reviving our program for cluster VMC calculations to make calculations of properties of medium-mass nuclei. We are particularly interested in computing the nuclear matrix element for neutrinoless double beta decay. This should need 50,000 hours. Industry partnership: Project URL: http://www.phy.anl.gov/theory/research/momenta/ Current FY Hours Used: undetermined amount New FY Requested allocation: 350000 Q1: 80000 Q2: 90000 Q3: 90000 Q4: 90000 Justification: Storage requirements: Thank You, The LCRC Accounts System