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arXiv 0708.2813nucl-ex
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利用~(12)C(p,n)~(12)N(g.s.)研究核关联效应1+)296 MeV

Study of nuclear correlation effects via 12C(p,n)12N(g.s.,1+) at 296 MeV

T. Wakasa, M. Dozono, E. Ihara, S. Asaji, K. Fujita, K. Hatanaka, M. Ichimura, T. Ishida, T. Kaneda, H. Matsubara, Y. Nagasue, T. Noro, Y. Sakemi, Y. Shimizu, H… 展开作者

T. Wakasa, M. Dozono, E. Ihara, S. Asaji, K. Fujita, K. Hatanaka, M. Ichimura, T. Ishida, T. Kaneda, H. Matsubara, Y. Nagasue, T. Noro, Y. Sakemi, Y. Shimizu, H. Takeda, Y. Tameshige, A. Tamii, Y. Yamada

摘要:

我们报告测量的横截面和一套完整的偏振观测的伽莫夫-泰勒${}^{12}{\rm C}(\vec{p},\vec{n}){}^{12}{\rm N}({\rm g.s.},1^+)$反应在轰击能量为296兆电子伏。数据进行了比较与扭曲波脉冲近似计算采用过渡形状因子规范化,重现所观察到的β-衰变$ft$值。在动量转移$q \gtrsim $ 0.5 ${\rm fm^{-1}}$时,横截面的预测值明显偏低。考虑到核平均场的非定域性,这种差异得到了部分解决。然而,计算仍然低估了$q$ $\simeq$ 1.6 ${\rm fm^{-1}}$在大动量转移时的横截面。我们还进行了计算,采用随机相位近似响应函数,发现所观察到的增强可以部分归因于核中的介子相关。

英文摘要:

We report measurements of the cross section and a complete set of polarization observables for the Gamow--Teller ${}^{12}{\rm C}(\vec{p},\vec{n}){}^{12}{\rm N}({\rm g.s.},1^+)$ reaction at a bombarding energy of 296 MeV. The data are compared with distorted wave impulse approximation calculations employing transition form factors normalized to reproduce the observed beta-decay $ft$ value. The cross section is significantly under-predicted by the calculations at momentum transfers $q \gtrsim $ 0.5 ${\rm fm^{-1}}$. The discrepancy is partly resolved by considering the non-locality of the nuclear mean field. However, the calculations still under-predict the cross section at large momentum transfers of $q$ $\simeq$ 1.6 ${\rm fm^{-1}}$. We also performed calculations employing random phase approximation response functions and found that the observed enhancement can be attributed in part to pionic correlations in nuclei.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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