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Reaction mechanisms of the O-16 + Cu-65 system

机译：O-16 + Cu-65系统的反应机制

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摘要

We have measured a precise quasielastic excitation function for the O-16 + Cu-65 system, at theta(LAB) = 161 degrees, and at bombarding energies near the Coulomb barrier. A quasielastic barrier distribution for this system was deduced from the experimental quasielastic excitation function. An alpha-stripping excitation function has also been measured at the same experimental conditions. These new data have been used to investigate the relative importance of several reaction channels in the reaction mechanism of the O-16 + Cu-65 system. Large-scale coupled-channel calculations and coupled-reaction-channel calculations have been performed. No imaginary potential was used at the barrier region because many channels have been explicitly included in the calculations. Only an inner short-range potential was used to account for the fusion process. We did not fit data by varying potential parameters, and our theoretical results were compared directly to data. Good agreement was found between data and calculations. Owing to the high sensitivity of the barrier distribution, important results have been obtained. The first excited state (1/2(-)) of Cu-65 has less influence in the reaction mechanism than the second (5/2(-)) and third (7/2(-)) states, which are the most relevant among all the investigated ones. We have also observed a striking influence of the reorientation of the ground-state spin of the Cu-65 nucleus on the elastic scattering at backward angles. In addition, calculations have shown that the excitation of the states 3(-), 2(+), 1(-), and 2(-) of the projectile O-16 are also important for excellent agreement obtained with both the excitation function and the distribution of barriers. The alpha-stripping data have been compared to the results of coupled-reaction-channel calculations and good agreement was obtained with the inclusion of the first excited state of C-12 in the coupling scheme. However, the alpha-transfer process has a small influence on the reaction dynamics of this system at the investigated energies.
机译：我们已经测量了O-16 + Cu-65系统的精确拟弧励磁功能，在θ（实验室）= 161度，并且在库仑屏障附近的轰击能量。从实验拟弹性激励功能推导出该系统的拟塑屏障分布。在相同的实验条件下也已经测量了α-汽提励磁功能。这些新数据已被用于研究几种反应通道在O-16 + Cu-65系统的反应机理中的相对重要性。已经进行了大规模的耦合通道计算和耦合反应通道计算。在障碍区域中没有使用虚部潜力，因为许多频道已明确地包括在计算中。仅使用内部短程潜力来解释融合过程。我们不通过不同的潜在参数来拟合数据，我们的理论结果直接与数据进行比较。数据和计算之间存在良好的一致。由于屏障分布的高灵敏度，已经获得了重要的结果。第一个激发态（1/2（ - ））Cu-65的反应机制影响较小（5/2（ - ））和第三（7/2（ - ））状态最多在所有调查的人中相关。我们还观察到在落角处于弹性散射的地面旋转的地面旋转的地面旋转的重新定位的引人注目的影响。此外，计算表明，射弹O-16的状态3（ - ），2（+），1（ - ）和2（ - ）的激励对于通过励磁功能获得的优秀协议也很重要和障碍的分布。已经将α剥离数据与偶联反应沟道计算结果进行比较，并且在偶联方案中包含第一个激发态，获得了良好的协议。然而，α-转移过程对该系统的反应动力学对调查能量产生了小的影响。

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  • 来源
    《Physical review, C》 |2019年第5期|共10页
  • 作者

    Crema E.; Zagatto V. A. B.; Shorto J. M. B.; Paes B.; Lubian J.; Simoes R. F.; Monteiro D. S.; Huiza J. F. P.; Added N.; Morais M. C.; Gomes P. R. S.;

  • 作者单位

    Univ Sao Paulo Inst Fis Dept Fis Nucl Caixa Postal 66318 BR-05315970 Sao Paulo SP Brazil;

    Univ Sao Paulo Inst Fis Dept Fis Nucl Caixa Postal 66318 BR-05315970 Sao Paulo SP Brazil;

    IPEN CNEN BR-05508000 Sao Paulo SP Brazil;

    Univ Fed Fluminense Inst Fis Ave Litoranea S-N BR-24210340 Niteroi RJ Brazil;

    Univ Fed Fluminense Inst Fis Ave Litoranea S-N BR-24210340 Niteroi RJ Brazil;

    Univ Sao Paulo Inst Fis Dept Fis Nucl Caixa Postal 66318 BR-05315970 Sao Paulo SP Brazil;

    Univ Fed Integracao Latino Amer ILACVN BR-85866000 Foz Do Iguacu Parana Brazil;

    Univ Estadual Sudoeste Bahia Itapetinga BA Brazil;

    Univ Sao Paulo Inst Fis Dept Fis Nucl Caixa Postal 66318 BR-05315970 Sao Paulo SP Brazil;

    Univ Fed Fluminense INFES BR-28470000 Rio De Janeiro Brazil;

    Univ Sao Paulo Inst Fis Dept Fis Nucl Caixa Postal 66318 BR-05315970 Sao Paulo SP Brazil;

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  • 正文语种 eng
  • 中图分类 原子核物理学、高能物理学;
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