[2B01-05] Application of Neutron Source and Target development

[2B02] Neutron Resonanse Absorption by Laser-driven Source -toward "Single Shot" Analysis-

*Akifumi Yogo¹, Zechen Lan¹, Takehito Hayakawa², Yasunobu Arikawa¹, Yuki Abe¹, Seyed Reza Mirafayzi³, Mitsuo Koizumi⁴, Takato Mori¹, Tianyun Wei¹, Shisuke Fujioka¹ (1. ILE, Osaka Univ, 2. QST, 3. Tokamak Eng Ltd, 4. JAEA)

Keywords:Laser-driven Neutron Source, Neutron Resonance Absorption

The laser-driven neutron source utilizes intense laser pulses focused on a thin-film as a primary target to produce MeV-energy ions (protons and deuterons) with an electric field induced by the plasmaa, which are then irradiated onto a secondary target (e.g. beryllium) to produce short pulses of fast neutrons. On the LFEX laser facility of Osaka University, we attached a small moderator to the secondary target and produced pulsed extrathermal neutrons. We analyzed the neutron spectra by using a Time-of-Flight detector located on the end of the 1.8 m beamline. The plates of silver (Ag), tantalum (Ta) and indium (In) were placed on the beamline and resonance absorption dips were measured at 3.81 eV (¹¹⁵In), 4.28 eV (¹⁸¹Ta) and 5.19 eV (¹⁰⁹Ag). These resonant absorption spectra were measured with neutrons generated by a single laser pulse. In my talk I will discuss the details of the experimental results and their possible application to future single-shot analyses.