Nuclear Incompressibility: How Far Can You Squeeze a Star?
讲座名称：
Nuclear Incompressibility: How Far Can You Squeeze a Star?
讲座时间：
2012-05-14
讲座人：
Umesh Garg
形式：
校区：
兴庆校区
实践学分：
讲座内容：
题 目： Nuclear Incompressibility: How Far Can You Squeeze a Star?
报告人： Prof. Umesh Garg,
Department of Physics, University of Notre Dame, USA
地 点： 中1-3113（物理多媒体教室）
时 间： 5月14日(周一)下午4:10
摘 要
The Nuclear Incompressibility parameter is one of the three important components characterizing the nuclear equation of state. It has crucial bearing on diverse nuclear and astrophysical phenomena, including strength of supernova collapse, emission of neutrinos in supernova explosions, and collective flow in medium- and high-energy nuclear collisions. The only direct experimental measurement of this parameter comes from the compressional-mode giant resonances. In this talk we will present recent results of investigations on the isoscalar giant dipole resonance (ISGDR)--an exotic mode of nuclear vibration which can be visualized as a hydrodynamic density oscillation in which a compressional wave traverses back and forth through the nucleus. These measurements employed inelastic scattering of 400 MeV alpha particles at very small angles, including 0deg. From our results, it has been possible to extract a value of nuclear incompressibility that is consistent with both compressional modes--the giant monopole resonance (the "breathing mode") and the isoscalar ISGDR (the "squeezing mode").
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