Asymmetry Dependence of the Nuclear Caloric Curve

A basic feature of the nuclear equation of state is not yet understood: the dependence of the nuclear caloric curve on the neutron-proton asymmetry. Predictions of theoretical models differ on the magnitude and even the sign of this dependence. In this work, the nuclear caloric curve is examined for...

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Bibliographic Details
Published in:arXiv.org 2012-08
Main Authors: McIntosh, Alan B, Bonasera, Aldo, Cammarata, Paul, Hagel, Kris, Heilborn, Lauren, Kohley, Zachary, Mabiala, Justin, May, Larry W, Marini, Paola, Raphelt, Andrew, Souliotis, George A, Wuenschel, Sara, Zarrella, Andrew, Yennello, Sherry J
Format: Article
Language:English
Subjects:
Asymmetry
Dependence
Equations of state
Nuclei (nuclear physics)
Projectiles
Quadrupoles
Thermodynamic properties
Variations
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Summary:A basic feature of the nuclear equation of state is not yet understood: the dependence of the nuclear caloric curve on the neutron-proton asymmetry. Predictions of theoretical models differ on the magnitude and even the sign of this dependence. In this work, the nuclear caloric curve is examined for fully reconstructed quasi-projectiles around mass A=50. The caloric curve extracted with the momentum quadrupole fluctuation thermometer shows that the temperature varies linearly with quasi-projectile asymmetry (N-Z)/A. An increase in asymmetry of 0.15 units corresponds to a decrease in temperature on the order of 1 MeV. These results also highlight the importance of a full quasi-projectile reconstruction in the study of thermodynamic properties of hot nuclei.
ISSN:2331-8422
DOI:10.48550/arxiv.1208.4887