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Title: Quasicontinuum γ decay of Zr 91 , 92 : Benchmarking indirect ( n , γ ) cross section measurements for the s process

Here, nuclear level densities (NLDs) and γ-ray strength functions (γSFs) have been extracted from particle-γ coincidences of the 92Zr(p,p´γ) 92Zr and 92Zr (p,dγ) 91Zr reactions using the Oslo method. The new 91,92Zr γSF data, combined with photonuclear cross sections, cover the whole energy range from Eγ ≈ 1.5 MeV up to the giant dipole resonance at Eγ ≈ 17 MeV. The wide-range γSF data display structures at Eγ ≈ 9.5 MeV, compatible with a superposition of the spin-flip M1 resonance and a pygmy E1 resonance. Furthermore, the γSF shows a minimum at Eγ ≈ 2–3 MeV and an increase at lower γ-ray energies. The experimentally constrained NLDs and γSFs are shown to reproduce known (n,γ) and Maxwellian-averaged cross sections for 91,92Zr using the TALYS reaction code, thus serving as a benchmark for this indirect method of estimating (n,γ) cross sections for Zr isotopes.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [3] ;  [1] ;  [4] ;  [5] ;  [1]
  1. Univ. of Oslo (Norway). Dept. of Physics
  2. Free Univ. of Brussels (Belgium). Inst. of Astronomy and Astrophysics
  3. National Inst. of Nuclear Physics (INFN), Bari (Italy)
  4. Konan Univ., Kobe (Japan). Dept. of Physics
  5. Ohio Univ., Athens, OH (United States). Dept. of Physics and Astronomy
Publication Date:
Grant/Contract Number:
NA0002905; 210007; 205528; 637686
Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 96; Journal Issue: 2; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Research Org:
Ohio Univ., Athens, OH (United States); Univ. of Oslo (Norway)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); Research Council of Norway (NFR); European Research Council (ERC); Fund for Scientific Research (FRS-FNRS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 79 ASTRONOMY AND ASTROPHYSICS; Level denity; gamma strength function; electromagnetic transitions; energy levels and level densities; nuclear astrophysics; photonuclear reactions; statistical phenomena and chaos; 90 ≤ A ≤ 149
OSTI Identifier:
1432345
Alternate Identifier(s):
OSTI ID: 1375672