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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.