Laboratory Tests of Low Density Astrophysical Equations of State

L. Qin; K. Hagel; R. Wada; J. B. Natowitz; S. Shlomo; A. Bonasera; G. Roepke; S. Typel; Z. Chen; M. Huang; J. Wang; H. Zheng; S. Kowalski; M. Barbui; M. R. D. Rodrigues; K. Schmidt; D. Fabris; M. Lunardon; S. Moretto; G. Nebbia; S. Pesente; V. Rizzi; G. Viesti; M. Cinausero; G. Prete; T. Keutgen; Y. El Masri; Z. Majka

doi:10.1103/physrevlett.108.172701

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arXiv · 1110.3345

Laboratory Tests of Low Density Astrophysical Equations of State

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Abstract

Clustering in low density nuclear matter has been investigated using the NIMROD multi-detector at Texas A&M University. Thermal coalescence modes were employed to extract densities, $ρ$, and temperatures, $T$, for evolving systems formed in collisions of 47 $A$ MeV $^{40}$Ar + $^{112}$Sn,$^{124}$Sn and $^{64}$Zn + $^{112}$Sn, $^{124}$Sn. The yields of $d$, $t$, $^{3}$He, and $^{4}$He have been determined at $ρ$ = 0.002 to 0.032 nucleons/fm$^{3}$ and $T$= 5 to 10 MeV. The experimentally derived equilibrium constants for $α$ particle production are compared with those predicted by a number of astrophysical equations of state. The data provide important new constraints on the model calculations.

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L. Qin, K. Hagel, R. Wada, J. B. Natowitz, S. Shlomo, A. Bonasera, G. Roepke, S. Typel, Z. Chen, M. Huang, J. Wang, H. Zheng, S. Kowalski, M. Barbui, M. R. D. Rodrigues, K. Schmidt, D. Fabris, M. Lunardon, S. Moretto, G. Nebbia, S. Pesente, V. Rizzi, G. Viesti, M. Cinausero, G. Prete, T. Keutgen, Y. El Masri, Z. Majka. 2012-03-20. Laboratory Tests of Low Density Astrophysical Equations of State. https://doi.org/10.1103/physrevlett.108.172701

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