Isospin Dependence of the Balance Energy

R. Pak; Bao-An Li; W. Benenson; O. Bjarki; J. A. Brown; S. A. Hannuschke; R. A. Lacey; D. J. Magestro; A. Nadasen; E. Norbeck; D. E. Russ; M. Steiner; N. T. B. Stone; A. M. Vander Molen; G. D. Westfall; L. B. Yang; S. J. Yennello

doi:10.1103/PhysRevLett.78.1026

Isospin Dependence of the Balance Energy

R. Pak, Bao-An Li, W. Benenson, O. Bjarki, J. A. Brown, S. A. Hannuschke, R. A. Lacey, D. J. Magestro, A. Nadasen, E. Norbeck, D. E. Russ, M. Steiner, N. T. B. Stone, A. M. Vander Molen, G. D. Westfall, L. B. Yang, and S. J. Yennello

Phys. Rev. Lett. 78, 1026 – Published 10 February 1997

Abstract

The energy at which collective transverse flow in the reaction plane disappears, the balance energy $E_{bal}$ , is found to depend on the isospin of the system using the reactions $^{58} Fe +^{58} Fe$ and $^{58} Ni +^{58} Ni$ . The more neutron-rich system exhibits higher balance energies for all measured impact parameters, in agreement with the predictions of a transport model which incorporates an isospin dependent mean field and isospin dependent in-medium nucleon-nucleon cross sections.

Received 20 August 1996

DOI:https://doi.org/10.1103/PhysRevLett.78.1026

Authors & Affiliations

R. Pak¹, Bao-An Li², W. Benenson¹, O. Bjarki¹, J. A. Brown¹, S. A. Hannuschke¹, R. A. Lacey³, D. J. Magestro¹, A. Nadasen⁴, E. Norbeck⁵, D. E. Russ⁶, M. Steiner¹, N. T. B. Stone¹, A. M. Vander Molen¹, G. D. Westfall¹, L. B. Yang⁵, and S. J. Yennello⁷

¹National Superconducting Cyclotron Laboratory and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-1321
²Cyclotron Institute and Department of Physics, Texas A&M University, College Station, Texas 77843-3366
³Department of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794-3400
⁴Department of Natural Sciences, University of Michigan, Dearborn, Michigan 48128-1491
⁵Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa 52242-1479
⁶Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742-2021
⁷Cyclotron Institute and Department of Chemistry, Texas A&M University, College Station, Texas 77843-3366