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Resonance neutron-capture cross sections of stable magnesium isotopes and their astrophysical implications

Journal Article · · Physical Review C
OSTI ID:1049920
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  1. ORNL
  2. Universita di Bologna
  3. University of Turin, Turin, Italy
  4. Instituto Nazionale di Fisica Nucleare, Bari, Italy
  5. 1st Nazl Fis Nucl, Bari, Italy
  6. CEA, Saclay, France
  7. Institut fur Kernphysik, Karlsruhe, Germany
  8. Karlsruhe Institute of Technology, Karlsruhe, Germany
  9. International Atomic Energy Agency (IAEA)
  10. CERN, Geneva, Switzerland
  11. Universitat Basel, Switzerland
  12. Instituto Nazionale de Fisica Nucleare, Trieste, Italy
  13. University of Santiago de Compostela, Spain
  14. Universidad de Santiago de Compostela
  15. Centro de Investigaciones Energeticas Medioambientales y Technol., Madrid, Spain
  16. CIEMAT, Madrid
  17. University of Lodz, Lodz, Poland
  18. University of Lodz
  19. University of Ioannina, Greece
  20. Universite Paris XI, Orsay, France
+ Show Author Affiliations
We have measured the neutron capture cross sections of the stable magnesium isotopes {sup 24,25,26}Mg in the energy range of interest to the s process using the neutron time-of-flight facility n{_}TOF at CERN. Capture events from a natural metal sample and from samples enriched in {sup 25}Mg and {sup 26}Mg were recorded using the total energy method based on C{sub 6}{sup 2}H{sub 6} detectors. Neutron resonance parameters were extracted by a simultaneous resonance shape analysis of the present capture data and existing transmission data on a natural isotopic sample. Maxwellian-averaged capture cross sections for the three isotopes were calculated up to thermal energies of 100 keV and their impact on s-process analyses was investigated. At 30 keV the new values of the stellar cross section for {sup 24}Mg, {sup 25}Mg, and {sup 26}Mg are 3.8 {+-} 0.2 mb, 4.1 {+-} 0.6 mb, and 0.14 {+-} 0.01 mb, respectively.
Research Organization:
Oak Ridge National Laboratory (ORNL)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-00OR22725
OSTI ID:
1049920
Journal Information:
Physical Review C, Journal Name: Physical Review C Journal Issue: 4 Vol. 85; ISSN 0556-2813; ISSN PRVCAN
Country of Publication:
United States
Language:
English

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Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CAPTURE
CERN
CROSS SECTIONS
ENERGY RANGE
MAGNESIUM ISOTOPES
NEUTRON REACTIONS
NEUTRONS
RESONANCE
S PROCESS
SHAPE