arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0812.4187nucl-ex
收藏

在无反冲转移反应中寻找$η$ -近中核

Search for $η$-mesic nuclei in recoil-free transfer reaction

GEM Collaboration, A. Budzanowski

摘要:

我们研究了反应$p+{^{27}Al}\to {^3{He}}+p+π^-+X$的无反冲运动学。因此,如果核$η$态存在的话,在这个反应中可能产生的一个$η$介子在实验室系统中几乎是静止的,因此很有可能被束缚。这种状态通过$N^*(1535)$共振的衰变将导致质子- $π^-$对以相反方向发射。在这些条件下,我们发现了这种束缚态的一些迹象。发现上限为$\approx$ 0.5 nb。

英文摘要:

We have studied the reaction $p+{^{27}Al}\to {^3{He}}+p+π^-+X$ at recoil-free kinematics. An $η$ meson possibly produced in this reaction would be thus almost at rest in the laboratory system and could therefore be bound with high probability, if nuclear $η$ states exist. The decay of such a state through the $N^*(1535)$ resonance would lead to a proton-$π^-$ pair emitted in opposite directions. For these conditions we find some indication of such a bound state. An upper limit of $\approx$ 0.5 nb is found.

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。

↑