TY - GEN
T1 - New probe of M1 and E1 strengths in GDR regions
AU - Hayakawa, T.
AU - Ogata, K.
AU - Miyamoto, S.
AU - Mochizuki, T.
AU - Horikawa, K.
AU - Amano, S.
AU - Imazaki, K.
AU - Li, D.
AU - Izawa, Y.
AU - Chiba, S.
PY - 2014
Y1 - 2014
N2 - The M1 strengths (or level density of 1+ states) are of importance for estimation of interaction strengths between neutrinos and nuclei for the study of the supernova neutrino-process. In 1957, Agodi predicted theoretically angular distribution of neutrons emitted from states excited via dipole transitions with linearly polarized gamma-ray beam at the polar angle of θ=90° should be followed by a simple function, a + b cos(2φ), where φ, is azimuthal angel. However, this theoretical prediction has not been verified over the wide mass region except for light nuclei as deuteron. We have measured neutron angular distributions with (polarized gamma, n) reactions on Au, Nal, and Cu. We have verified the Agodi's prediction for the first time over the wide mass region. This suggests that (polarized gamma, n) reactions may be useful tools to study M1 strengths in giant resonance regions.
AB - The M1 strengths (or level density of 1+ states) are of importance for estimation of interaction strengths between neutrinos and nuclei for the study of the supernova neutrino-process. In 1957, Agodi predicted theoretically angular distribution of neutrons emitted from states excited via dipole transitions with linearly polarized gamma-ray beam at the polar angle of θ=90° should be followed by a simple function, a + b cos(2φ), where φ, is azimuthal angel. However, this theoretical prediction has not been verified over the wide mass region except for light nuclei as deuteron. We have measured neutron angular distributions with (polarized gamma, n) reactions on Au, Nal, and Cu. We have verified the Agodi's prediction for the first time over the wide mass region. This suggests that (polarized gamma, n) reactions may be useful tools to study M1 strengths in giant resonance regions.
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U2 - 10.1063/1.4874090
DO - 10.1063/1.4874090
M3 - Conference contribution
AN - SCOPUS:84903134623
SN - 9780735412286
T3 - AIP Conference Proceedings
SP - 326
EP - 331
BT - Origin of Matter and Evolution of Galaxies 2013 - Proceedings of the 12th International Symposium on Origin of Matter and Evolution of Galaxies, OMEG 2013
PB - American Institute of Physics Inc.
T2 - 12th International Symposium on Origin of Matter and Evolution of Galaxies, OMEG 2013
Y2 - 18 November 2013 through 21 November 2013
ER -