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Title: New probe of M1 and E1 strengths in GDR regions

The M1 strengths (or level density of 1{sup +} 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.
Authors:
 [1] ;  [2] ; ; ; ;  [3] ; ; ;  [4] ;  [5]
  1. Japan Atomic Energy Agency and National Astronomical Observatory in Japan (Japan)
  2. RCNP, Osaka University (Japan)
  3. University of Hyogo (Japan)
  4. Institute for Laser Technology (Japan)
  5. Tokyo Institute of Technology (Japan)
Publication Date:
OSTI Identifier:
22280481
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1594; Journal Issue: 1; Conference: OMEG12: 12. international symposium on origin of matter and evolution of galaxies, Tsukuba (Japan), 18-21 Nov 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANGULAR DISTRIBUTION; ASTROPHYSICS; COPPER 63 TARGET; COSMIC NEUTRONS; E1-TRANSITIONS; ENERGY-LEVEL DENSITY; GAMMA RADIATION; GIANT RESONANCE; GOLD 197 TARGET; LIGHT NUCLEI; M1-TRANSITIONS; NEUTRINO REACTIONS; NEUTRINOS; NEUTRON EMISSION; OSCILLATOR STRENGTHS; POLARIZATION; SUPERNOVAE