Nuclear-matter distributions of halo nuclei from elastic proton scattering in inverse kinematics-猫眼课题宝

DOI：

10.1007/978-3-642-55560-2_20

发表时间：

2002-09

期刊：

The European Physical Journal A - Hadrons and Nuclei

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

P. Egelhof;G. Alkhazov;M. Andronenko;A. Bauchet;A. Dobrovolsky;S. Fritz;G. Gavrilov;H. Geissel;C. Gross;A. Khanzadeev;G. A. Korolev;G. Kraus;A. Lobodenko;G. Münzenberg;M. Mutterer;S. Neumaier;T. Schäfer;C. Scheidenberger;D. Seliverstov;N. A. Timofeev;A. Vorobyov;V. I. Yatsoura-

质子-核弹性散射是一种成熟的探测稳定核核物质密度分布的方法，首次应用于外来核。该方法是获得晕核尺寸和径向形状准确详细信息的有效手段。利用GSI Darmstadt的碎片分离器FRS提供的He和Li光束，在700 MeV/u附近测量了富中子氦同位素6he和8he的小角散射的绝对微分截面，以及最近对锂同位素6li，8Li，9Li和11li的绝对微分截面。利用充氢电离室IKAR同时作为靶和反冲质子探测器进行逆运动学实验。为了推导核物质分布，利用格劳伯多重散射理论计算的微分截面，以不同的核子密度分布参数作为输入，拟合到实验截面上。给出了核物质半径和物质分布的结果，并讨论了这些数据对晕结构的意义。6he和8he的核物质分布符合α-粒子样核和显著中子晕的概念。11li中的物质分布，正如先前与核靶的反应截面研究所预期的那样，是目前所研究的所有核中最广泛的晕成分。此外，目前的数据允许定量比较质量数a = 6或8的He和Li等压线的结构。测量的微分截面也被用于探测密度分布，正如从各种微观计算预测的那样。给出了几个例子。

Proton-nucleus elastic scattering at intermediate energies, a well-established method for probing nuclear-matter density distributions of stable nuclei, was applied for the first time to exotic nuclei. This method is demonstrated to be an effective means for obtaining accurate and detailed information on the size and radial shape of halo nuclei. Absolute differential cross-sections for small-angle scattering were measured at energies near 700 MeV/u for the neutron-rich helium isotopes6He and8He, and more recently for the lithium isotopes6Li,8Li,9Li and11Li, using He and Li beams provided by the fragment separator FRS at GSI Darmstadt. Experiments were performed in inverse kinematics using the hydrogen-filled ionization chamber IKAR which served simultaneously as target and recoil-proton detector. For deducing nuclear-matter distributions, differential cross-sections calculated with the aid of the Glauber multiple-scattering theory, using various parametrizations for the nucleon density distributions as input, were fitted to the experimental cross-sections. The results on nuclear-matter radii and matter distributions are presented, and the significance of the data for a halo structure is discussed. Nuclear-matter distributions obtained for6He and8He conform with the concept that both nuclei compose of α-particle like cores and significant neutron halos. The matter distribution in11Li exhibits, as expected from previous reaction cross-section studies with nuclear targets, the by far most extended halo component of all nuclei being investigated. In addition the present data allow a quantitative comparison of the structure of the He and Li isobares of either the mass numberA= 6 orA= 8. The measured differential cross-sections have also been used for probing density distributions as predicted from various microscopic calculations. A few examples are presented.

Nuclear-matter distributions of halo nuclei from elastic proton scattering in inverse kinematics

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