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arXiv 0805.0953nucl-ex
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势垒以下和势垒以上能量下6,7 Li +24 Mg反应的熔合截面

Fusion cross sections for 6,7Li + 24Mg reactions at energies below and above the barrier

M. Ray, A. Mukherjee, M. K. Pradhan, Ritesh Kshetri, M. Saha Sarkar, R. Palit, I. Majumdar, P. K. Joshi, H. C. Jain, B. Dasmahapatra

摘要:

用特征γ射线法测量了6,7 Li +24 Mg反应的熔合截面,能量范围从低于库仑势垒到远高于库仑势垒。从这两个系统的γ射线截面得到的熔合截面与低能时的总反应截面吻合得很好。熔合截面随能量增加而减小的现象与其它通道,特别是碎裂通道随轰击能量增加而打开的事实相一致。这表明,在屏障之上或之下,这些系统的融合截面既没有抑制也没有增强。由熔合截面导出的临界角动量(lcr)具有与其它Li诱导反应相似的能量依赖性。

英文摘要:

Measurement of fusion cross sections for the 6,7Li + 24Mg reactions by the characteristic gamma-ray method has been done at energies from below to well above the respective Coulomb barriers. The fusion cross sections obtained from these gamma-ray cross sections for the two systems are found to agree well with the total reaction cross sections at low energies. The decrease of fusion cross sections with increase of energy is consistent with the fact that other channels, in particular breakup open up with increase of bombarding energy. This shows that there is neither inhibition nor enhancement of fusion cross sections for these systems at above or below the barrier. The critical angular momenta (lcr) deduced from the fusion cross sections are found to have an energy dependence similar to other Li - induced reactions.

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