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Journal Articles

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

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

Physics Letters B, 737, p.109 - 113, 2014/10

https://doi.org/10.1016/j.physletb.2014.08.024
 Times Cited Count：18 Percentile：72.37(Astronomy & Astrophysics)

It was predicted in 1950's, the neutron angular distribution in ($$gamma$$, n) reactions with a 100% linearly polarized $$gamma$$-ray beam should be anisotropic and described by a simple function of a + b sin$$^{2}$$$${theta}$$ at 90$$^{circ}$$ on the beam axis but it has not been experimentally confirmed for middle-heavy nuclides over than half a century. We have verified experimentally this angular distribution on $$^{197}$$Au, $$^{127}$$I, and natural Cu using linearly polarized laser Compton scattering $$gamma$$-rays at NewSUBARU.

Oral presentation

Neutron angular distribution for ($$gamma$$, n) reactions with linear polarized photons

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

no journal, , 

It was predicted in 1950's 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. We have verified experimentally this angular distribution on three targets using linearly polarized laser Compton scattering $$gamma$$-rays at NewSUBARU.

Oral presentation

Laser Compton scattering $$gamma$$-ray experiments for supernova neutrino process

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

no journal, , 

The M1 strength in atomic nuclei is important for estimation of neutrino-nucleus interactions in supernovae. We have proposed a method using ($$gamma$$, n) reactions with linear polarized laser Compton scattering (LCS) $$gamma$$-rays to measure the M1 strength and verified a theoretical prediction for the first time.

Oral presentation

Angular distribution of neutron produced by a ($$gamma$$, n) reaction with linear polarized laser Compton scattering $$gamma$$-ray beam

Hayakawa, Takehito; Horikawa, Ken*; Mochizuki, Takayasu*; Miyamoto, Shuji*; Amano, So*; Izawa, Yasukazu*; Imasaki, Kazuo*; Chiba, Satoshi*

no journal, , 

no abstracts in English

Oral presentation

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*

no journal, , 

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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