The absolute differential cross sections for small-angle proton elastic scattering off the nuclei ^12,14−17C have been measured in inverse kinematics at energies near 700 MeV/u at GSI Darmstadt. The hydrogen-filled ionization chamber IKAR served simultaneously as a gas target and a detector for the recoil protons. The projectile scattering angles were measured with multi-wire tracking detectors. The radial nuclear matter density distributions and the root-mean-square nuclear matter radii were deduced from the measured cross sections using the Glauber multiple-scattering theory. A possible neutron halo structure in ¹⁵C, ¹⁶C and ¹⁷C is discussed. The obtained data show evidence for a halo structure in the ¹⁵C nucleus.

在GSI达姆施塔特（^DSI），在能量接近700 MeV / u的逆运动学条件下，测量了小^角质子从核^12,14-17 C散射的绝对微分截面。充氢的电离室IKAR同时用作气体目标和反冲质子的检测器。用多线跟踪探测器测量了弹丸的散射角。径向核物质密度分布和均方根核物质半径是使用格劳伯多重散射理论从测量的横截面推导出来的。讨论了¹⁵ C，¹⁶ C和¹⁷ C中可能的中子晕结构。所获得的数据显示了¹⁵个晕圈结构的证据C核。