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首页> 外文期刊>Physical review, C >Charge-changing cross-section measurements of C12-16 at around 45A MeV and development of a Glauber model for incident energies 10A-2100A MeV
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Charge-changing cross-section measurements of C12-16 at around 45A MeV and development of a Glauber model for incident energies 10A-2100A MeV

机译：电荷改变C12-16的横截面测量左右45A米，以及入射能量的Glauber模型10A-2100A MEV的开发

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We have measured for the first time the charge-changing cross sections (sigma(CC)) of (12-16)Con a C-12 target at energies below 100A MeV. To analyze these low-energy data, we have developed a finite-range Glauber model with a global parameter set within the optical-limit approximation which is applicable to reaction cross section (sigma(R)) and sigma(CC) measurements at incident energies from 10A to 2100A MeV. Adopting the proton-density distribution of C-12 known from the electron-scattering data, as well as the bare total nucleon-nucleon cross sections and the real-to-imaginary-part ratios of the forward proton-proton elastic scattering amplitude available in the literatures, we determine the energy-dependent slope parameter beta(pn) of the proton-neutron elastic differential cross section so as to reproduce the existing sigma(R) and interaction cross-section data for C-12+ C-12 over a wide range of incident energies. The Glauber model thus formulated is applied to calculate the sigma(R)'s of C-12 on a Be-9 and Al-27 targets at various incident energies. Our calculations show excellent agreement with the experimental data. Applying our model to the s(R) and sigma(CC) for the so-called neutron-skin C-16 nucleus, we reconfirm the importance of measurements at incident energies below 100A MeV. The proton root-mean-square radii of C12-16 are extracted using the measured sigma(CC)'s and the existing s(R) data. The results for C12-14 are consistent with the values from the electron scatterings, demonstrating the feasibility, usefulness of the sigma(CC) measurement, and the present Glauber model.
机译：我们已经测量了第一次（12-16）C-12靶在100a MeV的能量下的电荷变化的横截面（Sigma（Cc））。为了分析这些低能量数据，我们开发了一个有限范围的Glauber模型，其中包含在光学限制近似范围内的全局参数，可适用于事件能量的反应横截面（Sigma（R））和Sigma（CC）测量从10a到2100a mev。采用从电子散射数据中已知的C-12的质子密度分布，以及可用的前向质子 - 质子弹性散射幅度的裸核 - 核横截面和实影部分比文献中，我们确定质子中子弹性差分横截面的能量依赖性斜率β（PN），以便将现有的Sigma（R）和C-12 + C-12相互作用横截面数据。广泛的入射能。如此配制的Glauber模型应用于在各种入射能量的BE-9和Al-27靶标中计算C-12的Sigma（R）。我们的计算显示了与实验数据的良好协议。将我们的模型应用于S（R）和Sigma（CC），用于所谓的中子皮C-16核，我们重新确认了在100A MEV以下的入射能中测量的重要性。使用测量的Sigma（CC）和现有的S（R）数据提取C12-16的质子根平均方形半径。 C12-14的结果与来自电子散射的值一致，证明Sigma（CC）测量的可行性，有用性，以及目前的Glauber模型。

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