$\boldsymbol{dp\to {}^3}\textrm{He}\,\boldsymbolη$反应在过剩能量为1 ~ 15 MeV时的总截面和微分截面
Total and differential cross sections of the $\boldsymbol{dp\to {}^3}\textrm{He}\,\boldsymbolη$ reaction at excess energies between 1 and 15 MeV
摘要：
新的高精度的总和微分截面报告的$dp\to {}^3\textrm{He}\,η$反应接近阈值。测量是使用磁谱仪ANKE进行的，ANKE是COSY冷却器同步加速器的内部固定目标设施。这些数据取自$3.14641~\textrm{GeV}/c$和$3.20416~\textrm{GeV}/c$之间的氘束动量，它对应于$1.14~\textrm{MeV}$和$15.01~\textrm{MeV}$之间反应的过剩能量$Q$的范围。通过平行测量氘-质子弹性散射建立了标准化，并通过研究$dp\to {}^3\textrm{He}\,π^0$反应进行了检查。先前指出的生产阈值附近的微分截面斜率的符号可能发生变化，这可以通过$s$和$p$波干扰项的快速变化来解释，但新数据并未证实。通过用复Jost函数描述末态相互作用，很好地解释了总截面和$90^{\circ}$斜率参数的能量依赖性，所得结果对讨论$η$介子核具有重要意义.结合最近公布的WASA-at-COSY数据[P. Adlarson $et\, al.$，Phys. Lett. B 782，297（2018）]，斜率参数的平滑变化达到$80.9~\textrm{MeV}$的过剩能量。
英文摘要：
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 $80.9~\textrm{MeV}$.
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