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Title: First application of the Oslo Method in inverse kinematics

Journal Article · · European Physical Journal. A
ORCiD logo [1];  [1];  [2];  [3];  [4];  [5];  [2];  [2];  [6];  [1];  [1];  [2];  [7];  [2];  [1];  [2];  [2];  [5];  [5];  [6] more »;  [2];  [6];  [5];  [1];  [8];  [1];  [1];  [9] « less
  1. Univ. of Oslo (Norway)
  2. iThemba LABS, Somerset West (South Africa)
  3. Univ. de Stasbourg (France); National Centre for Scientific Research (CNRS), Strasbourg (France)
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  5. iThemba LABS, Somerset West (South Africa); Stellenbosch Univ., Matieland (South Africa)
  6. iThemba LABS, Somerset West (South Africa); Univ. of the Western Cape, Bellville (South Africa)
  7. iThemba LABS, Somerset West (South Africa); Univ. of Johannesburg, Auckland Park (South Africa)
  8. Helmholtz-Zentrum Dresden-Rossendorf, (Germany). Institut fur Strahlenphysik
  9. iThemba LABS, Somerset West (South Africa); Univ. of Zululand, KwaDlangezwa (South Africa)

The γ-ray strength function (γSF) and nuclear level density (NLD) have been extracted for the first time from inverse kinematic reactions with the Oslo method. This novel technique allows measurements of these properties across a wide range of previously inaccessible nuclei. Proton–γ coincidence events from the d(86Kr, pγ)87Kr reaction were measured at iThemba LABS and the γSF and NLD in 87Kr was obtained. The low-energy region of the γSF is compared to shell-model calculations, which suggest this region to be dominated by M1 strength. The γSF and NLD are used as input parameters to Hauser–Feshbach calculations to constrain (n,γ) cross sections of nuclei using the TALYS reaction code. These results are compared to 86Kr(n,γ) data from direct measurements.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); Research Council of Norway; National Research Foundation of South Africa; European Research Council (ERC); ChETEC Cost Action; International Atomic Energy Agency (IAEA)
Grant/Contract Number:
AC52-07NA27344; 222287; 262952; 263030; 240104; 118846; 637686; CA16117; 20454; 20447
OSTI ID:
1619342
Alternate ID(s):
OSTI ID: 1657679
Report Number(s):
LLNL-JRNL-790841; 989585; TRN: US2203287
Journal Information:
European Physical Journal. A, Vol. 56, Issue 2; ISSN 1434-6001
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

References (69)

Neutron capture measurements of the noble gas isotopes 22Ne, 40Ar and 78,80,84,86Kr in the keV energy region journal July 2002
KADoNiS- The Karlsruhe Astrophysical Database of Nucleosynthesis in Stars conference January 2006
Cross-Section Measurements of the Kr 86 ( γ , n ) Reaction to Probe the s -Process Branching at Kr 85 journal September 2013
Quasicontinuum γ decay of Zr 91 , 92 : Benchmarking indirect ( n , γ ) cross section measurements for the s process journal August 2017
Measuring high-energy -rays with Ge clover detectors
  • Lipoglavšek, M.; Likar, A.; Vencelj, M.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 557, Issue 2 https://doi.org/10.1016/j.nima.2005.11.067
journal February 2006
Experimentally constrained ( p , γ ) Y 89 and ( n , γ ) Y 89 reaction rates relevant to p -process nucleosynthesis journal April 2016
Extraction of thermal and electromagnetic properties in Ti 45 journal October 2009
LISE++: Radioactive beam production with in-flight separators journal October 2008
Low-energy enhancement in the γ -ray strength functions of Ge 73 , 74 journal June 2016
Transition probabilities in neutron-rich Se 84 , 86 journal December 2015
La 137 , 138 , 139 ( n , γ ) cross sections constrained with statistical decay properties of La 138 , 139 , 140 nuclei journal April 2017
From average parameters to statistical resolved resonances journal January 2013
Total cross section and resonance spectroscopy for n + 86 Kr journal October 1988
Measurements of the Kr 86 ( n , γ ) Kr 87 and Kr 86 ( n , 2 n ) Kr m 85 reaction cross sections below E n = 15 MeV journal July 2015
A Composite Nuclear-Level Density Formula with Shell Corrections journal August 1965
Nuclear Data Sheets for A = 87 journal November 2015
Microcanonical entropies and radiative strength functions of V 50 , 51 journal June 2006
Experimental energy-dependent nuclear spin distributions journal November 2009
Examination of the low-energy enhancement of the γ -ray strength function of Fe 56 journal February 2018
The shell model as a unified view of nuclear structure journal June 2005
Radiative neutron capture: Hauser Feshbach vs. statistical resonances journal January 2017
The Inelastic Scattering of Neutrons journal July 1952
The first generation of γ-rays from hot nuclei
  • 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 https://doi.org/10.1016/0168-9002(87)91221-6
journal April 1987
Pygmy dipole strength in 86 Kr and systematics of N = 50 isotones journal February 2013
The unfolding of continuum γ-ray spectra
  • 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 https://doi.org/10.1016/0168-9002(96)00197-0
journal June 1996
The p-process of stellar nucleosynthesis: astrophysics and nuclear physics status journal September 2003
Transitional γ strength in Cd isotopes journal January 2013
Novel technique for Constraining r -Process ( n , γ ) Reaction Rates journal December 2014
On angular distributions in compound nucleus processes journal September 1958
Galactic production of 138 La: Impact of 138,139 La statistical properties journal May 2015
Evidence for the Dipole Nature of the Low-Energy γ Enhancement in Fe 56 journal December 2013
First observation of low-energy γ -ray enhancement in the rare-earth region journal March 2016
Microscopic HFB + QRPA predictions of dipole strength for astrophysics applications journal July 2004
Impact of a low-energy enhancement in the γ -ray strength function on the neutron-capture cross section journal July 2010
Consistency of photon strength function models with data from the Mo 94 ( d , p γ γ ) reaction journal May 2016
Local and global nucleon optical models from 1 keV to 200 MeV journal January 2003
Extraction of level density and γ strength function from primary γ spectra
  • 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 https://doi.org/10.1016/S0168-9002(99)01187-0
journal June 2000
Low-Energy Enhancement of Magnetic Dipole Radiation journal December 2013
Statistical Emission in Nuclear Reactions and nuclear level density journal December 1961
Electric and Magnetic Dipole Strength at Low Energy journal July 2017
ENDF/B-VII.1 Nuclear Data for Science and Technology: Cross Sections, Covariances, Fission Product Yields and Decay Data journal December 2011
Radiative strength functions in Mo 93 − 98 journal April 2005
Kilo-Electron-Volt Neutron Capture Cross Sections of the Krypton Isotopes journal August 1986
Improved microscopic nuclear level densities within the Hartree-Fock-Bogoliubov plus combinatorial method journal December 2008
Systematics of nuclear level density parameters journal October 2005
Radiative neutron captures by neutron-rich nuclei and the r-process nucleosynthesis journal September 1998
An Attempt to Calculate the Number of Energy Levels of a Heavy Nucleus journal August 1936
Neutron-proton multiplets in the nucleus Br 88 journal July 2015
The statistical model and nuclear level densities journal October 1960
γ -ray strength function and pygmy resonance in rare earth nuclei journal March 2001
Nuclear level density and the determination of thermonuclear rates for astrophysics journal September 1997
Analysis of possible systematic errors in the Oslo method journal March 2011
Geant4—a simulation toolkit
  • Agostinelli, S.; Allison, J.; Amako, K.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 506, Issue 3 https://doi.org/10.1016/S0168-9002(03)01368-8
journal July 2003
Overlapping β decay and resonance neutron spectroscopy of levels in Kr 87 journal August 1983
Gamma-Ray Strength Functions book January 1973
The r-process of stellar nucleosynthesis: Astrophysics and nuclear physics achievements and mysteries journal September 2007
Talys-1.0 conference May 2008
Reference database for photon strength functions journal October 2019
Lane-consistent, semimicroscopic nucleon-nucleus optical model journal January 2001
Low-Energy Enhancement in the Photon Strength of Mo 95 journal April 2012
The first generation of γ-rays from hot nuclei
  • 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 https://doi.org/10.1016/0168-9002(87)91221-6
journal April 1987
The unfolding of continuum γ-ray spectra
  • 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 https://doi.org/10.1016/0168-9002(96)00197-0
journal June 1996
Nuclear Data Sheets for A = 87 journal November 2015
Galactic production of 138 La: Impact of 138,139 La statistical properties journal May 2015
Radiative neutron capture: Hauser Feshbach vs. statistical resonances journal January 2017
Novel techniques for constraining neutron-capture rates relevant for r-process heavy-element nucleosynthesis journal July 2019
Low-energy enhancement and fluctuations of γ -ray strength functions in 56,57 Fe: test of the Brink–Axel hypothesis journal April 2017
Constraining the astrophysical origin of the p-nuclei through nuclear physics and meteoritic data text January 2013
Cross-Section Measurements of the 86Kr(g,n) Reaction to Probe the s-Process Branching at 85Kr text January 2013