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arXiv 0907.3433nucl-ex
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$^4$ He光致蜕变为p+t

Photodisintegration of $^4$He into p+t

R. Nasseripour, B. L. Berman, N. Benmouna, Y. Ilieva, J. -M. Laget

摘要:

用杰斐逊实验室的CEBAF大接收谱仪(CLAS)研究了$^4$ He的二体光致蜕变为质子和Triton。用Hall-B韧致辐射标记系统在0.35 ~ 1.55 GeV能量范围内产生的实光子入射到液态$^4$ He靶上。这是首次测量$^4$ He在0.4 GeV以上的光致衰变。测量了$γ$ $^4$ He $\to pt$反应的微分截面随光子束能量和质子散射角的变化,并与J. M.拉吉特在0.6-1.2 GeV,我们的数据是在良好的协议,只有计算,包括三体机制,从而证实了它们的重要性。这些结果加强了我们以前对$^3$ He三体分裂的研究的结论,证明了三体机制在0.5-0.8 GeV能区的重要性。

英文摘要:

The two-body photodisintegration of $^4$He into a proton and a triton has been studied using the CEBAF Large-Acceptance Spectrometer (CLAS) at Jefferson Laboratory. Real photons produced with the Hall-B bremsstrahlung-tagging system in the energy range from 0.35 to 1.55 GeV were incident on a liquid $^4$He target. This is the first measurement of the photodisintegration of $^4$He above 0.4 GeV. The differential cross sections for the $γ$$^4$He$\to pt$ reaction have been measured as a function of photon-beam energy and proton-scattering angle, and are compared with the latest model calculations by J.-M. Laget. At 0.6-1.2 GeV, our data are in good agreement only with the calculations that include three-body mechanisms, thus confirming their importance. These results reinforce the conclusion of our previous study of the three-body breakup of $^3$He that demonstrated the great importance of three-body mechanisms in the energy region 0.5-0.8 GeV .

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