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First simultaneous measurement of the γ-ray and neutron emission probabilities in inverse kinematics at a heavy-ion storage ring

Journal Article · · Physical Review. C
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  1. Université de Bordeaux (France)
  2. Max Planck Inst. fuer Kernphysik, Heidelberg (Germany)
  3. GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
  4. Université Paris-Saclay, Orsay (France)
  5. Goethe Univ., Frankfurt (Germany)
  6. TRIUMF, Vancouver, BC (Canada); Univ. of Victoria, BC (Canada)
  7. Univ. of Valencia (Spain)
  8. Commissariat a l'Energie Atomique, Paris (France); Univ. Paris-Saclay (France)
  9. Max Planck Inst. fuer Kernphysik, Heidelberg (Germany); Heidelberg Univ. (Germany)
  10. TRIUMF, Vancouver, BC (Canada)
  11. Chalmers University of Technology, Gothenburg (Sweden)
  12. TRIUMF, Vancouver, BC (Canada); Univ. of British Columbia, Vancouver, BC (Canada)
  13. Centre National de la Recherche Scientifique (CNRS), Caen (France). Centre de Recherche sur les Ions, les Matériaux et la Photonique (CIMAP), Grand Accelerateur National d'Ions Lourds (GANIL)
  14. Goethe Univ., Frankfurt (Germany); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
  15. GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany); Aachen Univ. (Germany)
  16. Max Planck Inst. fuer Kernphysik, Heidelberg (Germany); GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany); Univ. of Edinburgh, Scotland (United Kingdom)
  17. Univ. Paris-Saclay, Gif-sur-Yvette (France)
+ Show Author Affiliations

The probabilities for γ-ray and particle emission as a function of the excitation energy of a decaying nucleus are valuable observables for constraining the ingredients of the models that describe the deexcitation of nuclei near the particle emission threshold. These models are essential in nuclear astrophysics and applications. In this paper, we have for the first time simultaneously measured the γ-ray and neutron emission probabilities of 208Pb. The measurement was performed in inverse kinematics at the Experimental Storage Ring (ESR) of the GSI/FAIR facility, where a 208Pb beam interacted through the 208Pb (p,p') reaction with a hydrogen gas jet target. Instead of detecting the γ rays and neutrons emitted by 208Pb, we detected the heavy beamlike residues produced after γ and neutron emission. These heavy residues were fully separated by a dipole magnet of the ESR and were detected with outstanding efficiencies. The comparison of the measured probabilities with model calculations has allowed us to test and select different descriptions of the γ-ray strength function and the nuclear level density available in the literature.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
2523985
Report Number(s):
LA-UR--25-21774
Journal Information:
Physical Review. C, Journal Name: Physical Review. C Journal Issue: 2 Vol. 111; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Gamma-ray strength functions
Inelastic scattering reactions
Level densities
Models &amp; methods for nuclear reactions
Nuclear reactions
Thermal &amp; statistical models