Colour-singlet strangelets at finite temperature

Details Colour-singlet strangelets at finite temperature Colour-singlet strangelets at finite temperature

1995-06-23

arxiv.org/abs/nucl-th/9506021v1

Phys.Rev.C55:2005-2009,1997

Physics

Nuclear Physics

Nuclear Theory

Revtex file(8 pages)+6 figures(ps files) available on request from first Author

Scientific paper

10.1103/PhysRevC.55.2005

Considering massless $u$ and $d$ quarks, and massive (150 MeV) $s$ quarks in a bag with the bag pressure constant $B^{1/4} = 145$ MeV, a colour-singlet grand canonical partition function is constructed for temperatures $T = 1-30$ MeV. Then the stability of finite size strangelets is studied minimizing the free energy as a function of the radius of the bag. The colour-singlet restriction has several profound effects when compared to colour unprojected case: (1) Now bulk energy per baryon is increased by about $250$ MeV making the strange quark matter unbound. (2) The shell structures are more pronounced (deeper). (3) Positions of the shell closure are shifted to lower $A$-values, the first deepest one occuring at $A=2$, famous $H$-particle ! (4) The shell structure at $A=2$ vanishes only at $T\sim 30$ MeV, though for higher $A$-values it happens so at $T\sim 20$ MeV.

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