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arXiv 0708.3944nucl-ex
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过剩能量高达90 MeV的np碰撞中的单π^-产生

Single π^- production in np collisions for excess energies up to 90 MeV

TOF collaboration, M. Abdel-Bary, K. -Th. Brinkmann, H. Clement, E. Doroshkevich, S. Dshemuchadse, A. Erhardt, W. Eyrich, H. Freiesleben, A. Gillitzer, R. Jäkel… 展开作者

TOF collaboration, M. Abdel-Bary, K. -Th. Brinkmann, H. Clement, E. Doroshkevich, S. Dshemuchadse, A. Erhardt, W. Eyrich, H. Freiesleben, A. Gillitzer, R. Jäkel, L. Karsch, K. Kilian, E. Kuhlmann, K. Möller, H. P. Morsch, L. Naumann, N. Paul, C. Pizzolotto, J. Ritman, E. Roderburg, W. Schroeder, M. Schulte-Wissermann, Th. Sefzick, A. Teufel, A. Ucar, P. Wintz, P. Wüstner, P. Zupranski

摘要:

用动量为1.85 GeV/c的氘束轰击液氢靶,在运动学完全实验中研究了准自由反应$np\to pp\pim$.除了三个带电的喷射物,旁观者质子也在大接受飞行时间光谱仪COSY-TOF中被检测到。它是通过它的动量和飞行方向来识别的,因此可以获得束缚中子的费米运动和有效中子4-动量矢量$\mathbb{P}_n$,这些矢量在不同的事件之间是不同的。覆盖了超过阈值的近90 MeV的过量能量的范围。推导了与能量相关的角分布、不变质谱和全覆盖的Dalitz图。发现了相当大的$pp$ FSI效应,以及$p$和$d$分波的贡献。根据新的截面数据讨论了基本截面$σ_{01}$在阈值附近的行为。与现有的文献数据相比,结果提供了一个敏感的测试的旁观者模型。

英文摘要:

The quasifree reaction $np\to pp\pim$ was studied in a kinematically complete experiment by bombarding a liquid hydrogen target with a deuteron beam of momentum 1.85 GeV/c and analyzing the data along the lines of the spectator model. In addition to the three charged ejectiles the spectator proton was also detected in the large-acceptance time-of-flight spectrometer COSY-TOF. It was identified by its momentum and flight direction thus yielding access to the Fermi motion of the bound neutron and to the effective neutron 4-momentum vector $\mathbb{P}_n$ which differed from event to event. A range of almost 90 MeV excess energy above threshold was covered. Energy dependent angular distributions, invariant mass spectra as well as fully covered Dalitz plots were deduced. Sizeable $pp$ FSI effects were found as were contributions of $p$ and $d$ partial waves. The behavior of the elementary cross section $σ_{01}$ close to threshold is discussed in view of new cross section data. In comparison with existing literature data the results provide a sensitive test of the spectator model.

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。

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