A new method for total-photoabsorption measurement of exotic nucleio

2016 Fiscal Year Final Research Report

• Project/Area Number: 26610053
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Tohoku University
• Principal Investigator: SUDA Toshimi 東北大学, 電子光理学研究センター, 教授 (30202138)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 短寿命不安定核 / 光核反応断面積 / 仮想光子法 / SCRIT / 電子散乱

Outline of Final Research Achievements

The final goal of this research is to measure the photoabsorption cross section of short-lived exotic nuclei covering the giant dipole resonance for the first time using electron beam. The SCRIT scheme we have invented for the structure studies of exotic nuclei by electron scattering was found to provide a new way to measure their photo-absorption cross section. Under the luminosity of 10**27 / cm 2 / s, needed for elastic electron scattering, inelastically scattered electrons at ultra-forward direction are detected inside the accelerator, and the measured inelastic cross section is converted to that of photoabsorption cross section by using virtual photon theory. It was clearly shown that inelastically scattered electrons resulting target-nucleus excitation can be detected even in the vicinity of the circulating electron beam of 200 mA. This clearly demonstrate that this ground-breaking new method for photonuclear reaction of exotic nuclei can be used for future experiment.

Free Research Field

原子核物理学　実験