[8a-Z25-1~12] 【CS.1】 Code-sharing Session of 2.4 & 7.5

[8a-Z25-6] Study on isobar separation technology by Laser Photo Detachment for Accelerator Mass Spectrometry

〇(M2)Tomoki Tanii¹, Yasuto Miyake², Takeyasu Yamagata³, Hiroyuki Matsuzaki³ (1.The Univ. of Tokyo, 2.RIKEN Nishina Center, 3.Univ of T. Museum)

Keywords:Laser Photo-Detachment(LPD), Electron affinity (EA)

We are studying laser photo-detachment(LPD), which is the novel isobaric separation method that utilizes the difference in electron configuration, that is, the difference in electron affinity (EA), in order to separate the target nuclide from the isobaric nuclide. Unlike conventional isobaric separation method, it does not depend on the difference in the number of protons, so it is possible to separate nuclides with a large mass number. In LPD, a laser gives a negative ion more energy than its EA, causing a photo-detachment reaction and neutralizing the negative ion.
In our research, an experiment of LPD using chlorine (3.61 eV) and sulfur (2.08 eV) was conducted. Nd: YAG laser was used and the wavelength is 532 nm (2.33 eV) to suppress only negative sulfur ions. The photo-detachment reaction was observed only in the case sulfur. The suppression rate of sulfur was calculated to be at most 36%. This rate can be improved up to almost 100 % by introducing He gas and causing Collisional Cooling.