Measurement of the reaction near threshold
Measurement of the reaction near threshold
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阈值附近反应的测量
DOI：
10.1016/j.physletb.2007.04.021
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发表时间：
2007
影响因子：
4.4
通讯作者：
J. Zlomanczuk
中科院分区：
文献类型：
--
作者：
R. Bilger;W. Brodowski;H. Calén;H. Clement;C. Ekström;G. Fäldt;K. Fransson;L. Gustafsson;B. Höistad;A. Johansson;T. Johansson;K. Kilian;S. Kullander;A. Kupsc;G. Kurz;P. Marciniewski;B. Morosov;A. Mörtsell;W. Oelert;V. Renken;R. Ruber;B. Shwartz;J. Stepaniak;A. Sukhanov;P. Thörngren;A. Turowiecki;G. Wagner;Z. Wilhelmi;C. Wilkin;J. Zabierowski;J. Zlomanczuk
在3He质心动量阈值（17.1 MeV/c ~ 87.5 MeV/c）附近测量了dp→3Heη反应的总截面和微分截面。这些数据是在一个用COSY-11设备检测3He弹射的质子目标上散射的COSY内部氘核束的缓慢爬坡过程中获得的。当质心动量大于50 MeV/c时，微分截面的前后不对称性明显偏离零，表明在最终状态存在更高的分波。当质心动量低于50 MeV/c时，将终态增强因子与总截面数据拟合得到3He -η散射长度为|= 4。3±0。5调频。
Total and differential cross sections for the dp→ 3Heη reaction have been measured near threshold for 3He center-of-mass momenta in the range from 17.1 MeV/c to 87.5 MeV/c. The data were taken during a slow ramping of the COSY internal deuteron beam scattered on a proton target detecting the 3He ejectiles with the COSY-11 facility. The forward–backward asymmetries of the differential cross sections deviate clearly from zero for center-of-mass momenta above 50 MeV/c indicating the presence of higher partial waves in the final state. Below 50 MeV/c center-of-mass momenta a fit of the final state enhancement factor to the data of the total cross sections results in the 3He–η scattering length of| a|= 4. 3±0. 5 fm.