Deuteron-induced reactions on<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">Y</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>89</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>and nuclear level density of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msup><mml:mrow /><mml:mn>90</mml:mn></mml:msup><mml:mi>Zr</mml:mi></mml:mrow></mml:math>

Byun, Y.; Ramirez, A. P. D.; Grimes, S. M.; Voinov, A.; Brune, C. R.; Massey, T. N.

doi:10.1103/physrevc.90.044303

Cited by 10 publications

(7 citation statements)

References 22 publications

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“…The pair breaking process will continue at least up to the binding energy, but probably to much higher excitations. In several evaporation experiments the constant temperature behavior has been observed up to E ≈ 15 MeV [34,35]. However, at the higher excitation energies the temperature will start increasing with excitation energies, and the Fermi gas description [1,3] will to an increasing degree describe the data.…”

Section: Experimental Level Densitiesmentioning

confidence: 97%

Experimental level densities of atomic nuclei

et al. 2015

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It is almost 80 years since Hans Bethe described the level density as a non-interacting gas of protons and neutrons. In all these years, experimental data were interpreted within this picture of a fermionic gas. However, the renewed interest of measuring level density using various techniques calls for a revision of this description. In particular, the wealth of nuclear level densities measured with the Oslo method favors the constant-temperature level density over the Fermi-gas picture. From the basis of experimental data, we demonstrate that nuclei exhibit a constant-temperature level density behavior for all mass regions and at least up to the neutron threshold.PACS. PACS-key 21.10. Ma, 25.20.Lj, 25.40.Hs

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Section: Experimental Level Densitiesmentioning

confidence: 97%

Experimental level densities of atomic nuclei

et al. 2015

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“…The technique is described in Ref. [29] and it was used in our previous publications [44][45][46][47]. It is based on the kinematics relation between the energy of the outgoing proton, ε p , the excitation energy E * res of the residual nucleus A − 1, and the Q-value of reaction…”

Section: Uncertainties Due To Proton Transmission Coefficientsmentioning

confidence: 99%

Level densities of Ge74,76 from compound nuclear reactions

et al. 2019

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The level densities of 74,76 Ge nuclei have been studied with 68,70 Zn(7 Li, Xp) reactions. Proton evaporation spectra have been measured at backward angles in a wide energy region from about 2 to 25 MeV. The analysis of spectra allowed for a testing of level density models used in modern reaction codes for practical cross section calculations. Our results show that at excitation energies above the discrete level region, all level density models tested in this work overestimate the level densities that are needed to reproduce proton spectra from these reactions. The Gilbert and Cameron model, which includes the constant temperature energy dependence of the level density, shows the best agreement with experiment, however, its parameters need to be adjusted to reflect the observed reduction of the level density at higher excitation energies.

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“…A variety of methods can be used to obtain ρ. Primary techniques include a direct determination of level spacings by level counting or neutron resonance spacings [8,9]; proton scattering at extreme forward angles [10]; Ericson fluctuations [11]; β-delayed particle spectrum fluctuations [12]; the regular, inverse kinematics, or β Oslo method [13][14][15][16]; and particle evaporation spectra [17][18][19]. Of the techniques that can be used on exotic nuclides, neutron resonance spacings and β-Oslo measurements require estimates of the spin distribution of excited states in order to obtain a total level density.…”

Section: Introductionmentioning

confidence: 99%

Determination of the $^{60}$Zn level density from neutron evaporation spectra

Soltesz,

Mamun,

Voinov

et al. 2021

Preprint

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Nuclear reactions of interest for astrophysics and applications often rely on statistical model calculations for nuclear reaction rates, particularly for nuclei far from β-stability. However, statistical model parameters are often poorly constrained, where experimental constraints are particularly sparse for exotic nuclides. For example, our understanding of the breakout from the NiCu cycle in the astrophysical rp-process is currently limited by uncertainties in the statistical properties of the proton-rich nucleus 60 Zn. We have determined the nuclear level density of 60 Zn using neutron evaporation spectra from 58 Ni( 3 He, n) measured at the Edwards Accelerator Laboratory. We compare our results to a number of theoretical predictions, including phenomenological, microscopic, and shell model based approaches. Notably, we find the 60 Zn level density is somewhat lower than expected for excitation energies populated in the 59 Cu(p, γ) 60 Zn reaction under rp-process conditions. This includes a level density plateau from roughly 5-6 MeV excitation energy, which is counter to the usual expectation of exponential growth and all theoretical predictions that we explore. A determination of the spin-distribution at the relevant excitation energies in 60 Zn is needed to confirm that the Hauser-Feshbach formalism is appropriate for the 59 Cu(p, γ) 60 Zn reaction rate at X-ray burst temperatures.

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Deuteron-induced reactions onY89and nuclear level density of90Zr

Cited by 10 publications

References 22 publications

Experimental level densities of atomic nuclei

Experimental level densities of atomic nuclei

Level densities of Ge74,76 from compound nuclear reactions

Determination of the $^{60}$Zn level density from neutron evaporation spectra

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