Münster 2002 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
HK: Physik der Hadronen und Kerne
HK 17: Nuclear Physics / Spectroscopy II
HK 17.5: Vortrag
Dienstag, 12. März 2002, 18:15–18:30, B
Phase transitions and two-neutron separation energies in algebraic models — •Ruben Fossion1, Kris Heyde1, and Jose-Enrique Garcia-Ramos2 — 1Department of Subatomic Physics, University of Gent, Proeftuinstraat,86 B-9000 Gent(Belgium) — 2Departamento de Fiscia Aplicada. EPS La Rabida, Universidad de Huelvam 21819 Palos de la Frontera (Spain)
In the last few years, interest for the study of phase transitions and phase coexistence in atomic nuclei has been revived, in particular making use of algebraic methods such as the Interacting Boson Model (IBM). In the present study we consider the three transitional regions in which one observes rapid structural changes i.e. (a) the Nd-Sm-Gd region, (b) the Ru-Pd region and, (c) the Os-Pt region. Although these regions have been studied extensively emphasizing excited state properties, not so much attention has been given, up to now, concerning possible phase transitions in the nuclear ground-state properties.
In this work, a new type of plot is presented that allows the study of phase transitions in finite systems, such as atomic nuclei. This approach allows to establish a connection between excited-state properties and binding energies. It can be shown that the binding energy and in particular the 2-neutron separation energy presents a very sensitive observable that allows to discriminate between apparently equivalent Hamiltonians.
We also present results on the systematics of 2-neutron separation energies in long chains of isotopes.