Extra gamma-ray strength for {sup 116,117}Sn arising from pygmy dipole resonance
Abstract
Photoneutron cross sections were measured for {sup 117}Sn and {sup 116}Sn near neutron thresholds with quasi-monochromatic laser Compton scattering gamma-rays. The measured cross sections for {sup 117}Sn and {sup 116}Sn are strongly enhanced from the threshold behavior expected for L = 1 neutron emissions after E1 photoexcitation. This suggests the presence of extra gamma-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 {sup 116}Sn within the framework of the statistical model calculation. It is shown that the extra gamma-ray strength can be interpreted as pygmy E1 resonance which was previously reported in the nuclear resonance fluorescence experiment for {sup 116}Sn and {sup 124}Sn.
- Authors:
-
- Department of Physics, Konan University, Okamoto 8-9-1, Higashinada, Kobe 658-8501 (Japan)
- National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8568 (Japan)
- Cyclotron Institute, Texas A and M University, College Station, Texas 77843 (United States)
- Institute d'Astronomie et d'Astrophysique, Universite Libre de Bruxelles, Campus de la Plaine, CP-226, 1050 Brussels (Belgium)
- Publication Date:
- OSTI Identifier:
- 21362111
- Resource Type:
- Journal Article
- Journal Name:
- AIP Conference Proceedings
- Additional Journal Information:
- Journal Volume: 1238; Journal Issue: 1; Conference: 7. Tours symposium on nuclear physics and astrophysics, Kobe (Japan), 16-20 Nov 2009; Other Information: DOI: 10.1063/1.3455938; (c) 2010 American Institute of Physics; Journal ID: ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; CAPTURE; COMPTON EFFECT; CROSS SECTIONS; DIPOLES; GAMMA RADIATION; GIANT RESONANCE; LASERS; MONOCHROMATIC RADIATION; NEUTRON EMISSION; NEUTRON REACTIONS; NEUTRON SOURCES; NEUTRONS; RESONANCE FLUORESCENCE; STATISTICAL MODELS; TIN 116; TIN 117; TIN 124; BARYON REACTIONS; BARYONS; BASIC INTERACTIONS; DAYS LIVING RADIOISOTOPES; ELASTIC SCATTERING; ELECTROMAGNETIC INTERACTIONS; ELECTROMAGNETIC RADIATION; ELEMENTARY PARTICLES; EMISSION; EVEN-EVEN NUCLEI; EVEN-ODD NUCLEI; FERMIONS; FLUORESCENCE; HADRON REACTIONS; HADRONS; INTERACTIONS; INTERMEDIATE MASS NUCLEI; IONIZING RADIATIONS; ISOMERIC TRANSITION ISOTOPES; ISOTOPES; LUMINESCENCE; MATHEMATICAL MODELS; MULTIPOLES; NUCLEAR REACTIONS; NUCLEI; NUCLEON REACTIONS; NUCLEONS; PARTICLE SOURCES; PHOTON EMISSION; RADIATION SOURCES; RADIATIONS; RADIOISOTOPES; RESONANCE; SCATTERING; STABLE ISOTOPES; TIN ISOTOPES
Citation Formats
Kamata, M, Utsunomiya, H, Akimune, H, Yamagata, T, Itoh, O, Iwamoto, C, Kondo, T, Toyokawa, H, Lui, Y -W, and Goriely, S. Extra gamma-ray strength for {sup 116,117}Sn arising from pygmy dipole resonance. United States: N. p., 2010.
Web. doi:10.1063/1.3455938.
Kamata, M, Utsunomiya, H, Akimune, H, Yamagata, T, Itoh, O, Iwamoto, C, Kondo, T, Toyokawa, H, Lui, Y -W, & Goriely, S. Extra gamma-ray strength for {sup 116,117}Sn arising from pygmy dipole resonance. United States. https://doi.org/10.1063/1.3455938
Kamata, M, Utsunomiya, H, Akimune, H, Yamagata, T, Itoh, O, Iwamoto, C, Kondo, T, Toyokawa, H, Lui, Y -W, and Goriely, S. 2010.
"Extra gamma-ray strength for {sup 116,117}Sn arising from pygmy dipole resonance". United States. https://doi.org/10.1063/1.3455938.
@article{osti_21362111,
title = {Extra gamma-ray strength for {sup 116,117}Sn arising from pygmy dipole resonance},
author = {Kamata, M and Utsunomiya, H and Akimune, H and Yamagata, T and Itoh, O and Iwamoto, C and Kondo, T and Toyokawa, H and Lui, Y -W and Goriely, S},
abstractNote = {Photoneutron cross sections were measured for {sup 117}Sn and {sup 116}Sn near neutron thresholds with quasi-monochromatic laser Compton scattering gamma-rays. The measured cross sections for {sup 117}Sn and {sup 116}Sn are strongly enhanced from the threshold behavior expected for L = 1 neutron emissions after E1 photoexcitation. This suggests the presence of extra gamma-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 {sup 116}Sn within the framework of the statistical model calculation. It is shown that the extra gamma-ray strength can be interpreted as pygmy E1 resonance which was previously reported in the nuclear resonance fluorescence experiment for {sup 116}Sn and {sup 124}Sn.},
doi = {10.1063/1.3455938},
url = {https://www.osti.gov/biblio/21362111},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1238,
place = {United States},
year = {Tue Jun 01 00:00:00 EDT 2010},
month = {Tue Jun 01 00:00:00 EDT 2010}
}