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.
Guttormsen, M., Goriely, S., Larsen, A. C., Gorgen, A., Hagen, T. W., Renstrom, T., Siem, S., Syed, N. U. H., Tagliente, G., Toft, H. K., Utsunomiya, H., Voinov, A. V., & Wikan, K. (2017). Quasicontinuum <math><mi>γ</mi></math> decay of <math><mmultiscripts><mi mathvariant='bold'>Zr</mi><mprescripts/><none/><mrow><mn>91</mn><mo>,</mo><mn>92</mn></mrow></mmultiscripts></math> : Benchmarking indirect ( <math><mrow><mi>n</mi><mo>,</mo><mi>γ</mi></mrow></math> ) cross section measurements for the <math><mi>s</mi></math> process. Physical Review C, 96(2). https://doi.org/10.1103/PhysRevC.96.024313
@article{osti_1432345,
author = {Guttormsen, M. and Goriely, S. and Larsen, A. C. and Gorgen, A. and Hagen, T. W. and Renstrom, T. and Siem, S. and Syed, N. U. H. and Tagliente, G. and Toft, H. K. and others},
title = {Quasicontinuum <math><mi>γ</mi></math> decay of <math><mmultiscripts><mi mathvariant='bold'>Zr</mi><mprescripts/><none/><mrow><mn>91</mn><mo>,</mo><mn>92</mn></mrow></mmultiscripts></math> : Benchmarking indirect ( <math><mrow><mi>n</mi><mo>,</mo><mi>γ</mi></mrow></math> ) cross section measurements for the <math><mi>s</mi></math> process},
annote = {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.},
doi = {10.1103/PhysRevC.96.024313},
url = {https://www.osti.gov/biblio/1432345},
journal = {Physical Review C},
issn = {ISSN 2469-9985},
number = {2},
volume = {96},
place = {United States},
publisher = {American Physical Society (APS)},
year = {2017},
month = {08}}
Ohio Univ., Athens, OH (United States); Univ. of Oslo (Norway)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); Research Council of Norway (NFR); European Research Council (ERC); Fund for Scientific Research (FRS-FNRS)
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 255, Issue 3https://doi.org/10.1016/0168-9002(87)91221-6
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 374, Issue 3https://doi.org/10.1016/0168-9002(96)00197-0
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 447, Issue 3https://doi.org/10.1016/S0168-9002(99)01187-0
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 648, Issue 1https://doi.org/10.1016/j.nima.2011.05.055