arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1209.2477nucl-thnucl-ex
收藏

EMC效应与短程相关

The EMC Effect and Short-Range Correlations

Misak M Sargsian

摘要:

我们概述了EMC和短程相关(SRC)效应的研究进展,特别强调了最近观察到的EMC比在Bjorken x 1的斜率之间的相关性<1 and the scale factor of the same ratio at x>,测量的强度在核中的SRC。这种相关性可能表明具有更高动量的核子的更大修改,从而使核子虚性成为介质修改的最相关参数。为了验证这一猜想,我们研究了核波函数高动量分量的几个性质对EMC效应特性的影响。我们观察到EMC-SRC关联的两个主要原因:第一,核平均场的贡献由于增加而减少,其中A是核波函数的高动量分量的分数。第二,SRC中核子介质修饰的增加。然而,我们的主要预测是增加质子的EMC效应的大A不对称核的贡献。这一预测是基于最近观察到的核波函数的高动量分量中pn SRC的强优势。我们的初步计算的基础上,这个预测的过剩的能量和修改后的质子在大A核描述合理以及所观察到的EMC-SRC相关的主要特点。

英文摘要:

We overview the progress made in studies of EMC and short range correlation (SRC) effects with the special emphasis given to the recent observation of the correlation between the slope of the EMC ratio at Bjorken x<1 and the scale factor of the same ratio at x>1 that measures the strength of the SRCs in nuclei. This correlation may indicate the larger modification of nucleons with higher momentum thus making the nucleon virtuality as the most relevant parameter of medium modifications. To check this conjecture we study the implication of several properties of high momentum component of the nuclear wave function on the characteristics of EMC effect. We observe two main reasons for the EMC-SRC correlation: first, the decrease of the contribution from the nuclear mean field due to the increase, with A, the fraction of the high momentum component of nuclear wave function. Second, the increase of the medium modification of nucleons in SRC. Our main prediction however is the increase of the proton contribution to the EMC effect for large A asymmetric nuclei. This prediction is based on the recent observation of the strong dominance of pn SRCs in the high momentum component of nuclear wave function. Our preliminary calculation based on this prediction of the excess of energetic and modified protons in large A nuclei describes reasonably well the main features of the observed EMC-SRC correlation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑