The auxiliary ﬁeld diffusion Monte Carlo method has been applied to simulate droplets of 7 and 8 neutrons. Results for realistic nucleon–nucleon interactions, which include tensor, spin–orbit and three-body forces, plus a standard one-body conﬁning potential, have been compared with analogous calculations obtained with Green’s function Monte Carlo methods. We have studied the dependence of the binding energy, the one-body density and the spin–orbit splittings of 7 n on the depth of the con- ﬁning potential. The results obtained show an overall agreement between the two quantum Monte Carlo methods, although there persist differences in the evaluation of spin–orbit forces, as previ- ously indicated by bulk neutron matter calculations. Energy density functional models, largely used in astrophysical applications, seem to provide results signiﬁcantly different from those of quantum simulations. Given its scaling behavior in the number of nucleons, the auxiliary ﬁeld diffusion Monte Carlo method seems to be one of the best candidate to perform ab initio calculations on neutron rich nuclei.
|Titolo:||Auxiliary field diffusion Monte Carlo calculation of ground state properties of neutron drops|
|Autori:||Pederiva, Francesco; A., Sarsa; K. E., Schmidt; S., Fantoni|
|Titolo del periodico:||NUCLEAR PHYSICS. A|
|Anno di pubblicazione:||2004|
|Numero e parte del fascicolo:||1-2|
|Appare nelle tipologie:||03.1 Articolo su rivista (Journal article)|