title: Ground state of small mixed helium and spin-polarized tritium clusters: a quantum Monte Carlo study.
abstract: We report results for the ground-state energy and structural properties of small (4)He-T↓ clusters consisting of up to four T↓ and eight (4)He atoms. These results have been obtained using very well-known (4)He-(4)He and T↓- T↓ interaction potentials and several models for the (4)He- T↓ interatomic potential. All the calculations have been performed with variational and diffusion Monte Carlo methods. It takes at least three atoms to form a mixed bound state. In particular, for small clusters the binding energies are significantly affected by the precise form of the (4)He- T↓ interatomic potential but the stability limits remain unchanged. The only exception is the (4)He(2)T↓ trimer whose stability in the case of the weakest (4)He- T↓ interaction potential is uncertain while it seems stable for other potentials. The mixed trimer (4)He(T↓)(2), a candidate for the Borromean state, is not bound. All other studied clusters are stable. Some of the weakest bound clusters can be classified as quantum halo as a consequence of having high probability of being in a classically forbidden region.
authors.affiliation: Faculty of Science, University of Split, HR-21000 Split, Croatia.
authors.forename: P
authors.initials: P
authors.lastname: Stipanović
authors.forename: L Vranješ
authors.initials: LV
authors.lastname: Markić
authors.forename: J
authors.initials: J
authors.lastname: Boronat
authors.forename: B
authors.initials: B
authors.lastname: Kežić