首页> 外文OA文献 >Parity Violating Measurements of Neutron Densities: Implications for Neutron Stars
【2h】

Parity Violating Measurements of Neutron Densities: Implications for Neutron Stars

机译:平价违反中子密度测量:对中子密度的影响   中子星

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务,本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文,但由于OA文献来源多样且变更频繁,仍可能出现获取不到、文献不完整或与标题不符等情况,如果获取不到我们将提供退款服务。请知悉。

摘要

Parity violating electron scattering can measure the neutron density of aheavy nucleus accurately and model independently. This is because the weakcharge of the neutron is much larger then that of the proton. The Parity RadiusExperiment (PREX) at Jefferson Laboratory aims to measure the root mean squareneutron radius of $^{208}$Pb with an absolute accuracy of 1% ($\pm 0.05$ Fm).This is more accurate then past measurements with hadronic probes, which allsuffer from controversial strong interaction uncertainties. PREX should clearlyresolve the neutron-rich skin. Furthermore, this benchmark value for $^{208}$Pbwill provide a calibration for hadronic probes, such as proton scattering,which can then be used to measure neutron densities of many exotic nuclei. ThePREX result will also have many implications for neutron stars. The neutronradius of Pb depends on the pressure of neutron-rich matter: the greater thepressure, the larger the radius as neutrons are pushed out against surfacetension. The same pressure supports a neutron star against gravity. The Pbradius is sensitive to the equation of state at normal densities while theradius of a 1.4 solar mass neutron star also depends on the equation of stateat higher densities. Measurements of the radii of a number of isolated neutronstars such as Geminga and RX J185635-3754 should soon improve significantly. Bycomparing the equation of state information from the radii of both Pb andneutron stars one can search for a softening of the high density equation ofstate from a phase transition to an exotic state. Possibilities include kaoncondensates, strange quark matter or color superconductors.
机译:违反奇偶校验的电子散射可以准确测量重原子核的中子密度并独立建模。这是因为中子的弱电荷比质子的弱电荷大得多。杰斐逊实验室的奇偶校验半径实验(PREX)旨在测量绝对均方根值为1%($ \ pm 0.05 $ Fm)的均方根中子半径$ ^ {208} $ Pb。受到争议性强相互作用不确定性的困扰。 PREX应该清楚地溶解富含中子的皮肤。此外,该$ ^ {208} $ Pb的基准值将提供强子探针的校准,例如质子散射,然后可用于测量许多外来核的中子密度。 PREX结果也将对中子星产生许多影响。 Pb的中子半径取决于富中子物质的压力:压力越大,随着中子克服表面张力推出,半径越大。相同的压力支撑中子星抵抗重力。 Pbradius对正常密度下的状态方程很敏感,而1.4太阳质量中子星的半径也取决于较高密度下的状态方程。诸如Geminga和RX J185635-3754之类的许多孤立中子星的半径测量应该很快会显着改善。通过比较Pb和中子星半径的状态信息方程,可以搜索从相变到奇异状态的高密度状态方程的软化。可能性包括钾缩合物,奇怪的夸克物质或彩色超导体。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号