New probe to Ml strengths in GDR region for supernova neutrino interactions

T. Hayakawa, S. Miyamoto, T. Mochizuki, K. Horikawa, S. Amano, K. Imazaki, D. Li, Y. Izawa, S. Chiba, K. Ogata

Research output: Contribution to journalConference articlepeer-review


The Ml strength (or level density of 1+ states) is of importance for estimation of interaction strengths between neutrinos and nuclei for the study of the supernova neutrino- process. We have proposed a method using (γ, n) reactions with linear polarized laser Compton scattering γ-rays to measure Ml strength. In 1957, Agodi predicted theoretically angular distribution of neutrons emitted from states excited via dipole transitions with linearly polarized γ-ray beam at the polar angle of 8=90° can be described by a simple function, a + b cos(θ2), where θ is azimuthal angel. However, this theoretical prediction has not been verified over the wide mass region. We have measured neutron angular distributions with (polarized gamma, n) reactions on Au, NaI, 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 Ml strength in giant resonance regions.

Original languageEnglish
Article number012003
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 2015
Externally publishedYes
EventNUBA Conference Series 1: Nuclear Physics and Astrophysics - Antalya, Turkey
Duration: Sept 15 2014Sept 21 2014

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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