Observation of a large reaction cross section in the drip-line nucleus 22C.
Observation of a large reaction cross section in the drip-line nucleus 22C.
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DOI：
10.1103/physrevlett.104.062701
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发表时间：
2010-02
影响因子：
8.6
通讯作者：
K. Tanaka;T. Yamaguchi;T. Suzuki;T. Ohtsubo;M. Fukuda;D. Nishimura;M. Takechi;K. Ogata;A. Ozawa;T. Izumikawa;T. Aiba;N. Aoi;H. Baba;Y. Hashizume;K. Inafuku;N. Iwasa;K. Kobayashi;M. Komuro;Y. Kondo;T. Kubo;M. Kurokawa;T. Matsuyama;S. Michimasa;T. Motobayashi;T. Nakabayashi;S. Nakajima;T. Nakamura;H. Sakurai;R. Shinoda;M. Shinohara;H. Suzuki;E. Takeshita;S. Takeuchi;Y. Togano;K. Yamada;T. Yasuno;M. Yoshitake
中科院分区：
文献类型：
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作者：
K. Tanaka;T. Yamaguchi;T. Suzuki;T. Ohtsubo;M. Fukuda;D. Nishimura;M. Takechi;K. Ogata;A. Ozawa;T. Izumikawa;T. Aiba;N. Aoi;H. Baba;Y. Hashizume;K. Inafuku;N. Iwasa;K. Kobayashi;M. Komuro;Y. Kondo;T. Kubo;M. Kurokawa;T. Matsuyama;S. Michimasa;T. Motobayashi;T. Nakabayashi;S. Nakajima;T. Nakamura;H. Sakurai;R. Shinoda;M. Shinohara;H. Suzuki;E. Takeshita;S. Takeuchi;Y. Togano;K. Yamada;T. Yasuno;M. Yoshitake
用透射法测量了40 A MeV附近19 C、20 C和滴线核22 C在液氢靶上的反应截面（σ（R））。与邻近的C同位素相比，观察到22 C的sigma（R）大幅增强。在光学极限近似下，使用有限程Glauber计算，22 C的均方根物质半径被推导为5.4+/-0.9 fm。它不遵循N <或= 14的碳同位素半径的系统行为，表明存在中子晕。通过基于Glauber少体计算的分析发现，22 C中的二价中子优先占据1 s（1/2）轨道。
Reaction cross sections (sigma(R)) for 19C, 20C and the drip-line nucleus 22C on a liquid hydrogen target have been measured at around 40A MeV by a transmission method. A large enhancement of sigma(R) for 22C compared to those for neighboring C isotopes was observed. Using a finite-range Glauber calculation under an optical-limit approximation the rms matter radius of 22C was deduced to be 5.4+/-0.9 fm. It does not follow the systematic behavior of radii in carbon isotopes with N < or = 14, suggesting a neutron halo. It was found by an analysis based on a few-body Glauber calculation that the two-valence neutrons in 22C preferentially occupy the 1s(1/2) orbital.