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arXiv 1608.07448nucl-ex
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A<=16 λ超核的Binding Energy和电荷对称破缺

On the Binding Energy and the Charge Symmetry Breaking in A<=16 Lambda-hypernuclei

E. Botta, T. Bressani, A. Feliciello

摘要:

近年来,在超核物理学领域,使用磁谱仪的几个实验提供了高精度的结果。特别是,准确测定的λ-结合能,B(λ),有助于相当刺激的讨论有关的电荷对称性破缺效应在λ-超核isomultiplets。我们重新整理了FINUDA实验的结果,并通过考虑仅来自磁谱仪的数据(DAFNE的FINUDA和JLab和MaMi的电产生实验),获得了A <= 16的λ超核的一系列B(λ)值。然后,我们批判性地重新审视了SKS协作组在KEK获得的结果,以便能够直接比较有和没有这种绝对能量尺度的实验数据。本文简要介绍了B(λ)的最近光谱测量,包括乳胶实验结果。得出了几个有趣的结论,其中,仅根据最近的光谱数据,在误差范围内的相等的A = 7,12,16的等多重态的B(λ)。这一观察结果与最近的理论预测非常一致。最后提出了可能的新措施,应改善目前的实验知识的想法。

英文摘要:

In recent years, several experiments using magnetic spectrometers provided high precision results in the field of Hypernuclear Physics. In particular, the accurate determination of the Lambda-binding energy, B(Lambda), contributed to stimulate considerably the discussion about the Charge Symmetry Breaking effect in Lambda-hypernuclei isomultiplets. We have reorganized the results from the FINUDA experiment and we have obtained a series of B(Lambda) values for Lambda-hypernuclei with A <= 16 by taking into account data only from magnetic spectrometers implementing an absolute calibration of the energy scale (FINUDA at DAFNE and electroproduction experiments at JLab and at MaMi). We have then critically revisited the results obtained at KEK by the SKS Collaboration in order to make possible a direct comparison between data from experiments with and without such an absolute energy scale. A synopsis of recent spectrometric measurements of B(Lambda) is presented, including also emulsion experiment results. Several interesting conclusions are drawn, among which the equality within the errors of B(Lambda) for the A = 7, 12, 16 isomultiplets, based only on recent spectrometric data. This observation is in nice agreement with a recent theoretical prediction. Ideas for possible new measurements which should improve the present experimental knowledge are finally put forward.

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