Nuclear-level densities around Z = 50 from neutron evaporation spectra in (p, n) reactions

Zhuravlev, B. V.; Лычагин, А. А.; Titarenko, N.N.

doi:10.1134/s106377880603001x

Cited by 12 publications

(8 citation statements)

References 3 publications

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“…Alpha-particle potentials are more uncertain. Differences between corresponding α-transmission coefficients depends on the α-energy and varies from ∼ 40% for lower α-energies to < 1% for higher α-energies in our region of interest (8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18). In order to reduce these uncertainties the RIPL α-potentials have been tested against the experimental data on low energy α−elastic scattering on 58 Ni [20].…”

Section: Experimental Particle Spectra and Level Density Of Produmentioning

confidence: 99%

“…from compound nuclear reactions). The latest data obtained from (p,n) reaction on Sn isotopes [8] claims that the available level density parameters do not reproduce neutron cross sections thereby indicating the problem with level density parameterizations. It becomes obvious that more experimental data on level density are needed in the energy region above discrete levels.…”

Section: Introductionmentioning

confidence: 99%

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Test of nuclear level density inputs for Hauser-Feshbach model calculations

et al. 2007

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The energy spectra of neutrons, protons, and α-particles have been measured from the d+ 59 Co and 3 He+ 58 Fe reactions leading to the same compound nucleus, 61 Ni. The experimental cross sections have been compared to Hauser-Feshbach model calculations using different input level density models. None of them have been found to agree with experiment. It manifests the serious problem with available level density parameterizations especially those based on neutron resonance spacings and density of discrete levels. New level densities and corresponding Fermi-gas parameters have been obtained for reaction product nuclei such as 60 Ni, 60 Co, and 57 Fe.

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Section: Experimental Particle Spectra and Level Density Of Produmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Test of nuclear level density inputs for Hauser-Feshbach model calculations

et al. 2007

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“…This result brings evidence that the level density parameter has dependence on N and Z rather than just on A. These predictions, which would have strong implications for nuclei far from the stability line, are sup-EPJ Web of Conferences ported by recent experimental findings [10], [11] and realistic calculations [12] of level density of nuclei far from the stability line. Based on the realistic assumptions that the levels of the compound system for nuclei far from the stability line have widths which are large enough to remove them from the category of compound nucleus levels, a strong reduction of the level density is obtained.…”

Section: Introductionmentioning

confidence: 55%

Search for isospin effects on nuclear level density

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Rana

et al. 2010

EPJ Web of Conferences

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Abstract. Studies on the isospin dependence of the level density have been recently reported in the literature for nuclei with 20≤A≤110. Corrections to the level density have been deduced which would imply a significant reduction of this quantity for nuclei far from the valley of stability. Isospin effects on the level density are also expected through the symmetry energy contribution to the nuclear masses, which is predicted to increase with the temperature. According to these findings, we have implemented the statistical model in order to account for isospin effects on the level density parameter a and on the temperature-dependent symmetry energy. We present the results of calculations for the decay of a variety of neutron-rich composite systems. We found that isospin produces sizable effects on different observables, this result being promising for future experiments with the second generation RIB facilities SPES and SPIRAL2. We report the results of a first experiment aimed at searching for isospin effects in the decay of 139 Eu composite nuclei produced by a stable beam at E x =90 MeV.

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“…The comparison of the calculated results of neutron emission energy spectra with the experimental data [51][52][53] at incident proton energies 6.86, 8.03, 9.09, 9.52, 10.17, 11.13 and 11.2 MeV are given in Fig. 18.…”

Section: Theoretical Results and Analysismentioning

confidence: 99%

“…Calculated energy spectra of neutron emission compared with the experimental data at incident energies 6.86 to 11.13[51,52] and 11.2[53] MeV. The curves and data points at the top represent true values, while the others are offset by factors of 10, 100, etc.…”

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confidence: 99%