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Extra γ-ray strength for 116,117Sn arising from pygmy dipole resonance
Authors
Hidetoshi Akimune
Stéphane Goriely
+8 more
Osamu Itoh
C. Iwamoto
Masaki Kamata
Takeo Kondo
Yiu-Wing Lui
Hiroyuki Toyokawa
Hiroaki Utsunomiya
Tamio Yamagata
Publication date
1 January 2010
Publisher
'AIP Publishing'
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Abstract
Photoneutron cross sections were measured for 117Sn and 116Sn near neutron thresholds with quasi-monochromatic laser Compton scattering γ-rays. The measured cross sections for 117Sn and 116Sn are strongly enhanced from the threshold behavior expected for L=1 neutron emissions after E1 photoexcitation. This suggests the presence of extra γ-ray strength in the low-energy tail of the giant dipole resonance. The present cross sections were analyzed together with radiative neutron capture cross sections for 116Sn within the framework of the statistical model calculation. It is shown that the extra γ-ray strength can be interpreted as pygmy E1 resonance which was previously reported in the nuclear resonance fluorescence experiment for 116Sn and 124Sn. © 2010 American Institute of Physics.SCOPUS: cp.pinfo:eu-repo/semantics/publishe
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Last time updated on 23/02/2017