62 MeV/核子下12C+12C碎裂微分截面的前角测量
Measurement of the forward angle $^{12}$C+$^{12}$C fragmentation differential cross sections at 62 MeV/nucleon
- School of Physics, Beihang University（北京航空航天大学物理学院）
- INFN Sezione di Firenze（佛罗伦萨INFN分部）
- Dipartimento di Fisica, Università di Firenze（佛罗伦萨大学物理系）
- INFN-Sezione di Catania（卡塔尼亚INFN分部）
- Dipartimento di Fisica e Astronomia, Università di Catania（卡塔尼亚大学物理与天文系）
- Université de Caen Normandie, ENSICAEN, CNRS/IN2P3, LPC Caen UMR6534（诺曼底卡昂大学，ENSICAEN，CNRS/IN2P3，LPC Caen联合研究实验室）
- Research Center for Nuclear Physics (RCNP), The University of Osaka（大阪大学核物理研究中心）
- State Key Laboratory of Heavy Ion Science and Technology, Institute of Modern Physics, Chinese Academy of Sciences（中国科学院近代物理研究所重离子科学与技术国家重点实验室）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究利用FAZIA阵列测量62 MeV/核子下12C+12C反应前角碎裂微分截面，结合多种技术鉴别粒子，发现Van Bibber公式对重碎片角分布描述更优，α粒子角分布异常窄，还提出运动学标度法用于跨能量数据对比。
AI中文摘要：
本工作利用FAZIA阵列，对62 MeV/核子下12C+12C反应的前角碎裂微分截面开展了高精度测量，在2 ≤ θ_lab ≤ 8度的范围内提取了Z=1至6的碎片角分布。粒子鉴别结合了ΔE-E技术与脉冲形状分析，并完成了精确的能量校准。结果表明，对于较重的碎片，Van Bibber公式比Goldhaber模型能更好地描述其角分布，这与所测角范围内耗散过程产生的宽成分占主导的情况一致。值得注意的是，α粒子呈现出异常窄的角分布，可能源自12C的固有团簇结构。与相同入射能量下的现有数据对比显示，二者吻合度极高，本研究还报告了更完整的粒子种类数据集，同时提出了一种运动学标度法，用于将本研究数据与50 MeV/核子及95 MeV/核子的先前实验数据进行比较。
英文摘要：
The present work reports on high-precision measurements of forward-angle fragmentation differential cross sections for the [12]C +[12] C reaction at 62 MeV/nucleon using the FAZIA array. Angular distributions for fragments from Z = 1 to 6 were extracted in the range 2 <= theta_lab <= 8 degrees. Particle identification was achieved by combining the Delta E - E technique with Pulse Shape Analysis, and precise energy calibrations were performed. The results show that for heavier fragments, the angular distributions are better described by the Van Bibber formulation than by the Goldhaber model, consistent with the dominance of a wide component from dissipative processes in the measured angular range. Notably, alpha particles exhibit an anomalously narrow angular distribution, likely originating from the intrinsic cluster structure of [12]C. Comparisons with existing data at the same incident energy show very good agreement, with a more complete set of species reported here, while a kinematic scaling is proposed to compare our data with previous experimental data at 50 and 95 MeV/nucleon.
