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arXiv 1208.6435nucl-thnucl-ex
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亚势垒熔合反应中的转移/破裂通道耦合

Transfer/Breakup Channel Couplings in Sub-barrier Fusion Reactions

C. Beck

摘要:

近年来,随着放射性离子束的出现,人们对库仑势垒附近重离子核反应的研究又重新引起了人们的兴趣。非弹性和传输通道耦合在稳定重离子引起的聚变反应中的作用可以重新考虑。本文首先讨论了用标准耦合道计算方法对最近的实验熔合截面的详细分析。以32 S +90,96 Zr为基准反应,分析了库仑位垒下聚变过程中的多中子转移效应。通过NTFus程序计算,包括中子转移通道的耦合,根据Zagrebaev半经典模型,32 S +96 Zr的熔合截面的增强在亚势垒能量下被很好地再现。对40 Ca +90 Zr和40 Ca +96 Zr的熔合激发函数也发现了类似的效应,同时还发现,在弹性散射和弱束缚稳定射弹引起的熔合过程中,破碎耦合也是关键的.在这项工作的第二部分中,全耦合通道计算的聚变激发函数进行分裂耦合的中子更丰富的反应和更弱的约束射弹。我们清楚地证明了连续离散耦合道计算能够再现来自6Li+59 Co中的分裂耦合的聚变增强。

英文摘要:

With the recent availability of state-of-the-art radioactive ion beams, there has been a renew interest in the investigation of nuclear reactions with heavy ions near the Coulomb barrier. The role of inelastic and transfer channel couplings in fusion reactions induced by stable heavy ions can be revisited. Detailed Analysis of recent experimental fusion cross sections by using standard coupled-channel calculations is first discussed. Multi-neutron transfer effects are introduced in the fusion process below the Coulomb barrier by analyzing 32S+90,96Zr as benchmark reactions. The enhancement of fusion cross sections for 32S+96Zr is well reproduced at sub-barrier energies by NTFus code calculations including the coupling of the neutron-transfer channels following the Zagrebaev semi-classical model. Similar effects for 40Ca+90Zr and 40Ca+96Zr fusion excitation functions are found. The breakup coupling in both the elastic scattering and in the fusion process induced by weakly bound stable projectiles is also shown to be crucial. In the second part of this work, full coupled-channel calculations of the fusion excitation functions are performed by using the breakup coupling for the more neutron-rich reaction and for the more weakly bound projectiles. we clearly demonstrate that Continuum-Discretized Coupled-Channel calculations are capable to reproduce the fusion enhancement from the breakup coupling in 6Li+59Co.

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