BRISOL钠同位素放射性核束的产生

Production of Sodium Isotope Radioactive Ion Beam on BRISOL Facility

摘要: 北京放射性核束装置在线同位素分离器（BRISOL）采用100 MeV、200 μA回旋加速器提供的质子束打靶产生中、短寿命放射性核束，在线分析后供物理用户使用，其质量分辨率好于20 000。为开展²⁰Na核的奇异衰变特性研究，研制了氧化镁靶，并采用100 MeV质子束轰击氧化镁靶在线产生了^20～26Na⁺的钠同位素放射性核束。当质子束流强为8 μA时，²⁰Na⁺离子束的最大产额为2×10⁵ s^-1，²¹Na⁺离子束的最大产额为4×10⁸ s^-1。完成了北京放射性核束装置首个放射性核束物理实验，累计供束近200 h。

Abstract: The Beijing radioactive ion beam facility (BRIF) isotope separator on-line (BRISOL) is a radioactive ion beam facility based on a 100 MeV@200 μA cyclotron. The radioactive ion beams are produced by bombarding the thick target with proton beam provided by cyclotron. The mass resolution of the BRISOL is better than 20 000. The MgO target was developed to fulfill the requirements of the study of the exotic decay mode of ²⁰Na. The sodium isotope ion beams of ^20-26Na⁺ were produced by bombarding MgO target with 100 MeV proton beam. The maximum production of the ²⁰Na⁺ beam is 2×10⁵ s^-1 and the maximum production of the ²¹Na⁺ beam is 4×10⁸ s^-1 when the proton beam intensity is 8 μA. The first physics experiment of BRIF was carried out and the total beam time for this experiment was about 200 h.