skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

Abstract

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:
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)
OSTI Identifier:
1432345
Alternate Identifier(s):
OSTI ID: 1375672
Grant/Contract Number:  
NA0002905; 210007; 205528; 637686
Resource 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)
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

Citation Formats

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., and Wikan, K. Quasicontinuum γ decay of Zr91,92 : Benchmarking indirect ( n,γ ) cross section measurements for the s process. United States: N. p., 2017. Web. doi:10.1103/PhysRevC.96.024313.
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. Quasicontinuum γ decay of Zr91,92 : Benchmarking indirect ( n,γ ) cross section measurements for the s process. United States. doi:10.1103/PhysRevC.96.024313.
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., and Wikan, K. Mon . "Quasicontinuum γ decay of Zr91,92 : Benchmarking indirect ( n,γ ) cross section measurements for the s process". United States. doi:10.1103/PhysRevC.96.024313. https://www.osti.gov/servlets/purl/1432345.
@article{osti_1432345,
title = {Quasicontinuum γ decay of Zr91,92 : Benchmarking indirect ( n,γ ) cross section measurements for the s process},
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 Utsunomiya, H. and Voinov, A. V. and Wikan, K.},
abstractNote = {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},
journal = {Physical Review C},
number = 2,
volume = 96,
place = {United States},
year = {2017},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 3 works
Citation information provided by
Web of Science

Save / Share:

Works referenced in this record:

Nuclear Reactions in Stars and Nucleogenesis
journal, June 1957

  • Cameron, A. G. W.
  • Publications of the Astronomical Society of the Pacific, Vol. 69
  • DOI: 10.1086/127051

Neutron Cross Sections for Nucleosynthesis Studies
journal, September 2000

  • Bao, Z. Y.; Beer, H.; KÄPpeler, F.
  • Atomic Data and Nuclear Data Tables, Vol. 76, Issue 1
  • DOI: 10.1006/adnd.2000.0838

M 1 γ Strength for Zirconium Nuclei in the Photoneutron Channel
journal, April 2008


Novel technique for Constraining r -Process ( n , γ ) Reaction Rates
journal, December 2014


Modern Nuclear Data Evaluation with the TALYS Code System
journal, December 2012


RIPL – Reference Input Parameter Library for Calculation of Nuclear Reactions and Nuclear Data Evaluations
journal, December 2009


s ‐Process Nucleosynthesis in Asymptotic Giant Branch Stars: A Test for Stellar Evolution
journal, April 2003

  • Lugaro, Maria; Herwig, Falk; Lattanzio, John C.
  • The Astrophysical Journal, Vol. 586, Issue 2
  • DOI: 10.1086/367887

Application of an extended random-phase approximation to giant resonances in light-, medium-, and heavy-mass nuclei
journal, September 2016


Completing the nuclear reaction puzzle of the nucleosynthesis of Mo 92
journal, August 2016


Experimental First Order Pairing Phase Transition in Atomic Nuclei
journal, February 2015


High Resolution Neutron Transmission and Capture for 91Zr
journal, January 1977

  • de L. Musgrove, Ar; Boldeman, Jw; Allen, Bj
  • Australian Journal of Physics, Vol. 30, Issue 4
  • DOI: 10.1071/PH770391

Experimental level densities of atomic nuclei
journal, December 2015

  • Guttormsen, M.; Aiche, M.; Bello Garrote, F. L.
  • The European Physical Journal A, Vol. 51, Issue 12
  • DOI: 10.1140/epja/i2015-15170-4

The Quantum Theory of the Emission and Absorption of Radiation
journal, March 1927

  • Dirac, P. A. M.
  • Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 114, Issue 767
  • DOI: 10.1098/rspa.1927.0039

Extraction of level density and γ strength function from primary γ spectra
journal, June 2000

  • Schiller, A.; Bergholt, L.; Guttormsen, M.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 447, Issue 3
  • DOI: 10.1016/S0168-9002(99)01187-0

Low-Energy Enhancement of Magnetic Dipole Radiation
journal, December 2013


Radiative strength functions in Mo 93 98
journal, April 2005


Experimentally constrained ( p , γ ) Y 89 and ( n , γ ) Y 89 reaction rates relevant to p -process nucleosynthesis
journal, April 2016


THE IMPACT OF UPDATED Zr NEUTRON-CAPTURE CROSS SECTIONS AND NEW ASYMPTOTIC GIANT BRANCH MODELS ON OUR UNDERSTANDING OF THE S PROCESS AND THE ORIGIN OF STARDUST
journal, December 2013

  • Lugaro, Maria; Tagliente, Giuseppe; Karakas, Amanda I.
  • The Astrophysical Journal, Vol. 780, Issue 1
  • DOI: 10.1088/0004-637X/780/1/95

Validity of the Generalized Brink-Axel Hypothesis in Np 238
journal, January 2016


The SiRi particle-telescope system
journal, August 2011

  • Guttormsen, M.; Bürger, A.; Hansen, T. E.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 648, Issue 1
  • DOI: 10.1016/j.nima.2011.05.055

Low-energy enhancement in the γ -ray strength functions of Ge 73 , 74
journal, June 2016


Improved microscopic nuclear level densities within the Hartree-Fock-Bogoliubov plus combinatorial method
journal, December 2008


A statistical analysis of excited nuclear states
journal, May 1959


Systematics of nuclear level density parameters
journal, October 2005


Fluctuations of Nuclear Reaction Widths
journal, October 1956


Erratum: Systematics of nuclear level density parameters [Phys. Rev. C 72, 044311 (2005)]
journal, April 2006


Investigation of 91Zr by high resolution (d, p), (p, p′) and (p, d) reactions
journal, November 1976


Neutron capture cross section of Zr 90 : Bottleneck in the s -process reaction flow
journal, March 2008


Separation of Pygmy Dipole and M 1 Resonances in Zr 90 by a High-Resolution Inelastic Proton Scattering Near 0°
journal, June 2012


γ -ray strength function and pygmy resonance in rare earth nuclei
journal, March 2001


Statistical Gamma-Decay at Low Angular Momentum
journal, January 1990


Analysis of possible systematic errors in the Oslo method
journal, March 2011


Global and local level density models
journal, September 2008


The 93 Zr( n , γ ) reaction up to 8 keV neutron energy
journal, January 2013


Measurement of keV-Neutron Capture Cross Sections and Capture Gamma-Ray Spectra of 91,92 Zr
journal, April 2005

  • Ohgama, Kazuya; Igashira, Masayuki; Ohsaki, Toshiro
  • Journal of Nuclear Science and Technology, Vol. 42, Issue 4
  • DOI: 10.1080/18811248.2005.9726399

Photoneutron Cross Sections for Zr 90 , Zr 91 , Zr 92 , Zr 94 , and Y 89
journal, October 1967


The s process: Nuclear physics, stellar models, and observations
journal, April 2011


The temperature and chronology of heavy-element synthesis in low-mass stars
journal, January 2015

  • Neyskens, P.; Van Eck, S.; Jorissen, A.
  • Nature, Vol. 517, Issue 7533
  • DOI: 10.1038/nature14050

Synthesis of the Elements in Stars
journal, October 1957

  • Burbidge, E. Margaret; Burbidge, G. R.; Fowler, William A.
  • Reviews of Modern Physics, Vol. 29, Issue 4
  • DOI: 10.1103/RevModPhys.29.547

The r-process of stellar nucleosynthesis: Astrophysics and nuclear physics achievements and mysteries
journal, September 2007


The Inelastic Scattering of Neutrons
journal, July 1952


Large Low-Energy M 1 Strength for Fe 56 , 57 within the Nuclear Shell Model
journal, December 2014


The first generation of γ-rays from hot nuclei
journal, April 1987

  • Guttormsen, M.; Ramsøy, T.; Rekstad, J.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 255, Issue 3
  • DOI: 10.1016/0168-9002(87)91221-6

Low-Energy Enhancement in the Photon Strength of Mo 95
journal, April 2012


Experimental study of the Zr 91 ( n , γ ) reaction up to 26 keV
journal, October 2008


The unfolding of continuum γ-ray spectra
journal, June 1996

  • Guttormsen, M.; Tveter, T. S.; Bergholt, L.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 374, Issue 3
  • DOI: 10.1016/0168-9002(96)00197-0

Test of gamma-ray strength functions in nuclear reaction model calculations
journal, May 1990