Elsevier

Nuclear Physics A

Volume 730, Issues 3–4, 26 January 2004, Pages 255-284
Nuclear Physics A

A systematic investigation of reaction cross sections and isomer ratios for neutrons up to 20 MeV on Ni-isotopes and 59Co by measurements with the activation technique and new model studies of the underlying reaction mechanisms

https://doi.org/10.1016/j.nuclphysa.2003.11.005Get rights and content

Abstract

Results of new cross section measurements are presented for the following neutron-induced reactions: 58Ni(n, p)58m+gCo, 58Ni(n, p)58mCo, 58Ni(n, x)57Co, 58Ni(n, 2n)57Ni, 60Ni(n, p)60m+gCo, 60Ni(n, p)60mCo, 61Ni(n, p)61Co, 61Ni(n, x)60mCo, 62Ni(n, x)61Co, and 59Co(n, 2n)58m+gCo with emphasis on incident energies between 14 and 20 MeV. In addition, new results have been obtained for the isomer ratios of the 58Ni(n, p)58m+gCo, the 60Ni(n, p)60m+gCo and 59Co(n, 2n)58m+gCo reactions.

Detailed model calculations were undertaken to study the systematics of (n,xp) reactions on Ni isotopes and the use of the measured isomer ratios for the determination of the effective moment of inertia in the level density expression. Good overall agreement was obtained and, in particular, the case of the 58Ni target isotope now shows a complete physically consistent database that is ideal to test model calculations. The difference in spin between isomer and ground state of ΔJ=3 for the 58Co and 60Co residual nuclei results in a sensitivity to the spin dependence of the level density in these nuclei. However, at present, measurement uncertainties and uncertainties associated with the decay schemes preclude a definitive conclusion about the appropriate value of the effective moment of inertia. A comparison was made between a locally optimized parameter set based on all available data and a global approach. This approach allowed to identify where problems with the global approach can be expected. The locally optimized parameter set includes for the first time gamma-ray strength-functions based on an improved systematics of the gamma-ray widths.

References (75)

  • C. Kalbach

    Phys. Rev. C

    (1986)
  • A. Fessler et al.

    Neutron activation cross section measurements from 16 to 20 MeV for isotopes of F, Na, Mg, Al, Si, P, Cl, Ti, V, Mn, Fe, Nb, Sn, and Ba

    Nucl. Sci. Eng.

    (2000)
  • A.J.M. Plompen et al.

    Neutron activation cross section measurements at Geel

    J. Nucl. Sci. Technol. Suppl.

    (2002)
  • A.J.M. Plompen et al.

    Vanadium cross section measurements by the activation technique and evaluations from threshold to 20 MeV

    J. Nucl. Sci. Technol. Suppl.

    (2002)
  • P. Reimer et al.

    Reaction mechanisms of fast neutrons on 51V below 21 MeV

    Phys. Rev. C

    (2001)
  • S. Sudár et al.

    Phys. Rev. C

    (1996)
  • V. Avrigeanu et al.

    Energy dependence of the isomeric cross section ratio in the 58Ni(n, p)58m, gCo reaction

    Phys. Rev. C

    (1999)
  • K. Gul

    Calculation of excitation functions and isomeric cross section ratio of the 58Ni(n, p)58m, gCo reactions in the 1–20 MeV energy range

    Phys. Rev. C

    (2000)
  • G. Lövestam, private communication...
  • H.H. Andersen et al.

    Hydrogen Stopping Powers and Ranges in All Elements

    (1977)
  • D. Schlegel, Monte Carlo code TARGET, PTB-6.14-98-1, Braunschweig, April 1998, private communication...
  • A.B. Smith

    Argonne National Laboratory, Report No. ANL/NDM-115

  • V. McLane

    Evaluated Nuclear Data File, Section B, Version VI (ENDF/B-VI)

  • M. Wagner et al.

    Evaluation of cross sections of 14 important neutron-dosimetry reactions

    Physics Data

    (1990)
  • M. Wagner, Report INDC(AUS)-D14, Vienna, in [16]...
  • H. Condé, Nuclear Data Standards for Nuclear Measurements, Tech. Rep. NEANDC-311 “U”, OECD Nuclear Energy Agency,...
  • K. Debertin, U. Schötzig, Bedeutung von Summationskorrekturen bei der Gammastrahlen-Spektrometrie mit...
  • J.F. Briesmeister, MCNP™—A General Monte Carlo N-Particle Transport Code, Tech. Rep. LA-13709-M, Los Alamos National...
  • M. Avrigeanu et al.

    Preequilibrium-emission surface effects in activation reactions

    J. Nucl. Sci. Technol. Suppl.

    (2002)
  • P.D. Kunz, DWUCK4 User Manual, OECD/NEA Data Bank,...
  • M. Avrigeanu, V. Avrigeanu, Recent improvements of the STAPRE-H95 pre-equilibrium and statistical model code, IPNE...
  • P.E. Hodgson
  • A.J. Koning, S. Hilaire, The TALYS Nuclear Model Code, version 0.49, 2002, in...
  • A.J. Koning

    J. Nucl. Sci. Technol. Suppl.

    (2002)
  • V. Avrigeanu et al.

    On consistent description of nuclear level density

    J. Nucl. Sci. Technol. Suppl.

    (2002)
  • C.L. Dunford, R.R. Kinsey, NuDat System for Access to Nuclear Data, Tech. Rep. IAEA-NDC-205 (BNL-NCS-65687), IAEA,...
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