New probe of M1 and E1 strengths in GDR regions

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish
Title of host publicationOrigin of Matter and Evolution of Galaxies 2013 - Proceedings of the 12th International Symposium on Origin of Matter and Evolution of Galaxies, OMEG 2013
PublisherAmerican Institute of Physics Inc.
Pages326-331
Number of pages6
ISBN (Print)9780735412286
DOIs
Publication statusPublished - 2014
Externally publishedYes
Event12th International Symposium on Origin of Matter and Evolution of Galaxies, OMEG 2013 - Tsukuba, Japan
Duration: Nov 18 2013Nov 21 2013

Publication series

NameAIP Conference Proceedings
Volume1594
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other12th International Symposium on Origin of Matter and Evolution of Galaxies, OMEG 2013
Country/TerritoryJapan
CityTsukuba
Period11/18/1311/21/13

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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