Bochum 2009 – wissenschaftliches Programm
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HK: Fachverband Hadronen und Kerne
HK 42: Few-body physics
HK 42.5: Vortrag
Dienstag, 17. März 2009, 17:45–18:00, H-ZO 100
Progress in the Quantum Monte Carlo approach to small- and medium-sized nuclei — Paolo Armani1, Stefano Gandolfi2, Pietro Faccioli1, and •Francesco Pederiva1 — 1Dipartmento di Fisica and I.N.F.N., Universita’ di Trento, via Sommarive, 14 I-38100 Trento, Italy — 2S.I.S.S.A., International School for Advanced Studies, via Beirut, 2 I-34014 Trieste, Italy
Green’s Function Monte Carlo methods have been successfully applied in the past to describe nuclei with masses up to A=12. In the last few years, the introduction of the Auxiliary Field Diffusion Monte Carlo method (AFDMC) of S. Fantoni and K. Schmidt allowed to compute properties of systems with larger masses due to a more efficient treatment of the spin- and isospin-dependent part of the nucleon-nucleon interaction.
We present recent calculations of the properties of nuclei up to 16O with a potential including the tensor component. However, the treatment of spin-orbit and three body terms within AFDMC remains difficult. In this context we will then present the recent developments in the quest of a Diffusion Monte Carlo scheme based on Effective Field Theory Hamiltonians, in which the pionic degrees of freedom are treated explicitly, under the assumption of the conservation of the nucleon number and with the introduction of an explicit kinetic term for nucleons already at the leading order.