Thermal neutron capture cross-section to {sup 113}Cd isomer for the study of s-process origin of {sup 115}Sn

Journal Article · Tue Jun 01 00:00:00 EDT 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3455935· OSTI ID:21362108

Hayakawa, Takehito; Shizuma, Toshiyuki ^[1]; Chiba, Satoshi; Hatsukawa, Yuichi; Iwamoto, Nobuyuki; Shinohara, Nobuo; Harada, Hideo ^[2]; Kajino, Toshitaka ^[3]

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1. Kansai Photon Science Institute, Japan Atomic Energy Agency, Kizu, Kyoto 619-0215 (Japan)
2. Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195 (Japan)
3. National Astronomical Observatory, Osawa, Mitaka, Tokyo 181-8588 (Japan)

The astrophysical origin of a p-nucleus {sup 115}Sn has remained still an open question. The nucleus {sup 115}Sn may be produced by a weak branch of the s-process through a beta-unstable isomer in {sup 113}Cd. However, a neutron capture cross-section to this isomer has not been measured with high accuracy at any energy. A neutron capture cross-section for the {sup 112}Cd(n,gamma){sup 113}Cd{sup m} reaction has been measured with neutrons provided from a nuclear reactor. The nucleus {sup 115}Sn may be produced by a nucleosynthesis flow through {sup 113}Cd{sup m} in the s-process. We have obtained the thermal neutron capture cross-section of 0.028+-0.009[b] and the resonance integral of 1.1+-0.3[b] using a cadmium difference method. The cross-section ratio of the isomer to the ground state has been calculated as a function of the incident neutron energy, E, by using a statistical model. The calculated ratios are almost constant over a wide range of E<100 keV. We have evaluated the s-process contribution to the solar abundance of {sup 115}Sn using the classical steady-flow model. This calculated result has shown that the production through {sup 113}Cd{sup m} may be minor contribution to {sup 115}Sn.

• OSTI ID: 21362108
• Journal Information: AIP Conference Proceedings, Vol. 1238, Issue 1; Conference: 7. Tours symposium on nuclear physics and astrophysics, Kobe (Japan), 16-20 Nov 2009; Other Information: DOI: 10.1063/1.3455935; (c) 2010 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ABUNDANCE
ASTROPHYSICS
CADMIUM 112
CADMIUM 112 TARGET
CADMIUM 113
CAPTURE
CROSS SECTIONS
GROUND STATES
ISOMERS
KEV RANGE 10-100
NEUTRON REACTIONS
NUCLEOSYNTHESIS
RESONANCE INTEGRALS
S PROCESS
STATISTICAL MODELS
STEADY FLOW
THERMAL NEUTRONS
TIN 115
BARYON REACTIONS
BARYONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CADMIUM ISOTOPES
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EVOLUTION
FERMIONS
FLUID FLOW
HADRON REACTIONS
HADRONS
INTEGRALS
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
KEV RANGE
MATHEMATICAL MODELS
NEUTRONS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEONS
PHYSICS
RADIOISOTOPES
STABLE ISOTOPES
STAR EVOLUTION
SYNTHESIS
TARGETS
TIN ISOTOPES
YEARS LIVING RADIOISOTOPES