Incompressibility of neutron-rich matter
- Department of Physics, Florida State University, Tallahassee, Florida 32306 (United States)
- Departament d'Estructura i Constituents de la Materia and Institut de Ciencies del Cosmos, Facultat de Fisica, Universitat de Barcelona, Diagonal 647, E-08028 Barcelona (Spain)
The saturation properties of neutron-rich matter are investigated in a relativistic mean-field formalism using two accurately calibrated models: NL3 and FSUGold. The saturation properties--density, binding energy per nucleon, and incompressibility coefficient--are calculated as a function of the neutron-proton asymmetry {alpha}{identical_to}(N-Z)/A to all orders in {alpha}. Good agreement (at the 10% level or better) is found between these numerical calculations and analytic expansions that are given in terms of a handful of bulk parameters determined at saturation density. Using insights developed from the analytic approach and a general expression for the incompressibility coefficient of infinite neutron-rich matter, i.e., K{sub 0}({alpha})=K{sub 0}+K{sub {tau}}{alpha}{sup 2}+..., we construct a hybrid model with values for K{sub 0} and K{sub {tau}} as suggested by recent experimental findings. Whereas the hybrid model provides a better description of the measured distribution of isoscalar monopole strength in the Sn isotopes relative to both NL3 and FSUGold, it significantly underestimates the distribution of strength in {sup 208}Pb. Thus, we conclude that the incompressibility coefficient of neutron-rich matter remains an important open problem.
- OSTI ID:
- 21286937
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 79, Issue 5; Other Information: DOI: 10.1103/PhysRevC.79.054311; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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