论文标题
$ \ boldsymbol {dp \ to {}^3} \ textrm {he} \，\boldsymbolη$在1至15 meV之间的反应反应的$ \ boldsymbol {dp \ to {}^3} \ textrm {}^3} \ textrm {}^3} \ textrm {}^3} \ textrm {}^3}
Total and differential cross sections of the $\boldsymbol{dp\to {}^3}\textrm{He}\,\boldsymbolη$ reaction at excess energies between 1 and 15 MeV
论文作者
论文摘要
报告了$ dp \ to {}^3 \ textrm {he} \，η$反应接近阈值的新的高精度总和横截面。使用磁光谱仪ANKE进行测量，该磁性光谱仪是舒适冷却器同步器处的内部固定目标设施。该数据的数据是在$ 3.14641〜 \ textrm {gev}/c $和$ 3.20416〜 \ textrm {gev}/c $之间获取的，该范围与此反应的多余能源$ q $相对应。通过在Deuteron-Proton弹性散射的并行测量中建立了归一化，并通过研究$ dp \ to {}^3 \ textrm {he} \，π^0 $反应来检查。以前指出的可能会更改生产阈值附近差分横截面的斜率的迹象，这可以通过新数据证实，这可以通过$ s $ - $ s $和$ p $ - 波的干扰项的快速变化来解释。总横截面和$ 90^{\ circ} $斜率参数的能量依赖性通过用复杂的jost函数描述最终状态相互作用来很好地解释，并且在讨论$η$ - 墨西核的讨论中，结果很重要。结合最近发布的Wasa-at-At-Cosy数据[P. Adlarson $ et \，Al。$，Phys。 Lett。 B 782，297（2018）]，实现斜率参数的平滑变化，最高能量为$ 80.9〜 \ textrm {Mev} $。
New high precision total and differential cross sections are reported for the $dp\to {}^3\textrm{He}\,η$ reaction close to threshold. The measurements were performed using the magnetic spectrometer ANKE, which is an internal fixed target facility at the COSY cooler synchrotron. The data were taken for deuteron beam momenta between $3.14641~\textrm{GeV}/c$ and $3.20416~\textrm{GeV}/c$, which corresponds to the range in excess energy $Q$ for this reaction between $1.14~\textrm{MeV}$ and $15.01~\textrm{MeV}$. The normalization was established through the measurement in parallel of deuteron-proton elastic scattering and this was checked through the study of the $dp\to {}^3\textrm{He}\,π^0$ reaction. The previously indicated possible change of sign of the slope of the differential cross sections near the production threshold, which could be explained by a rapid variation of the $s$- and $p$-wave interference term, is not confirmed by the new data. The energy dependence of the total cross section and the $90^{\circ}$ slope parameter are well explained by describing the final state interaction in terms of a complex Jost function and the results are significant in the discussion of $η$-mesic nuclei. In combination with recently published WASA-at-COSY data [P. Adlarson $et\, al.$, Phys. Lett. B 782, 297 (2018)], a smooth variation of the slope parameter is achieved up to an excess energy of $80.9~\textrm{MeV}$.
