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Verification of angular distribution of ($$gamma$$, n) reaction with linear polarized $$gamma$$-rays predicted theoretically half a century ago

Hayakawa, Takehito; Horikawa, Ken*; Miyamoto, Shuji*; Mochizuki, Takayasu*; Amano, So*; Li, D.*; Imasaki, Kazuo*; Izawa, Yasukazu*; Ogata, Kazuyuki*; Chiba, Satoshi*

In 1950's, 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$$cdot$$cos($${2}{phi}$$)at polar angle $$theta$$=90$$^{circ}$$, where $$phi$$ is the azimuthal angle, but it has not been experimentally confirmed over half a century. The work by Agodi had been forgotten after 1970's. We have verified experimentally this angular distribution on three targets using linearly polarized laser Compton scattering $$gamma$$-rays at NewSUBARU for the first time.



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