Neutron angular distribution in (gamma, n) reactions with linearly polarized gamma-ray beam generated by laser Compton scattering

作者：Horikawa K; Miyamoto S; Mochizuki T; Amano S; Li D; Imasaki K; Izawa Y; Ogata K; Chiba S; Hayakawa T^*

来源：Physics Letters B, 2014, 737: 109-113.

DOI：10.1016/j.physletb.2014.08.024

• Linear polarized gamma-ray
• Photodisintegration reactions
• M1 strength
• Giant dipole resonance
• Neutron angular distribution

In 1957, Agodi predicted that the neutron angular distribution in (gamma, n) reactions with a 100% linearly polarized gamma-ray beam for dipole excitation should be anisotropic and universally described by the simple function of a + b . cos(2 phi) at the polar angle theta = 90 degrees, where phi is the azimuthal angle. However, this prediction has not been experimentally confirmed in over half a century. We have verified experimentally this angular distribution in the (gamma, n) reaction for Au-197, I-127, and natural Cu targets using linearly polarized laser Compton scattering gamma-rays. The result suggests that the ((gamma) over right arrow, n) reaction is a novel tool to study nuclear physics in the giant dipole resonance region.

• 出版日期2014-10-7
• 单位中国科学院国家天文台