Neutron-induced nucleosynthesis

Herndl, H.; Rauscher, T.; Beer, H.

doi:10.1007/bf01931785

Cited by 10 publications

(24 citation statements)

References 104 publications

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“…When considering deformation our results could be modified in two ways: Firstly, the number of bound low-spin levels could be increased, leading to larger DC cross sections; secondly, due to a possibly larger number of levels at and above the neutron separation energy, the compound reaction mechanism could be further enhanced and clearly dominate the resulting cross sections. However, as can be seen from level density [2,13] and deformation (e.g., [19]) studies, deformation of Pb isotopes sets in at a mass number of about A ≃ 220 and decreases already for masses beyond A ≃ 230. Closer to the drip-line, the nuclei show low level densities again, not only due to low neutron separation energies but also because of sphericity.…”

Section: Discussionmentioning

confidence: 89%

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Dependence of direct neutron capture on nuclear-structure models

et al. 1998

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The prediction of cross sections for nuclei far off stability is crucial in the field of nuclear astrophysics. We calculate direct neutron capture on the even-even isotopes 124−145 Sn and 208−238 Pb with energy levels, masses, and nuclear density distributions taken from different nuclear-structure models. The utilized structure models are a Hartree-Fock-Bogoliubov model, a relativistic mean field theory, and a macroscopic-microscopic model based on the finite-range droplet model and a folded-Yukawa single-particle potential. Due to the differences in the resulting neutron separation and level energies, the investigated models yield capture cross sections sometimes differing by orders * Permanent address: P. Moller

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Section: Discussionmentioning

confidence: 89%

“…The relation between DC and CN mechanisms has already been studied for neutron capture by light and intermediate target nuclei [2,[7][8][9][10][11][12]. Investigations of the dependence of the level density on charge and mass number and a discussion of the applicability of the statistical model have been given elsewhere [13].…”

Section: Introductionmentioning

confidence: 99%

Dependence of direct neutron capture on nuclear-structure models

et al. 1998

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“…For future use, for alpha particles and heavier projectiles, it is clear that the best results can probably be obtained with folding potentials (e.g. [27,28,29]). …”

Section: B Transmission Coefficientsmentioning

confidence: 99%

Nuclear level density and the determination of thermonuclear rates for astrophysics

1997

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The prediction of cross sections for nuclei far off stability is crucial in the field of nuclear astrophysics. In recent calculations the nuclear level density -as an important ingredient to the statistical model (Hauser-Feshbach) -has shown the highest uncertainties. We present a global parametrization of nuclear level densities within the back-shifted Fermi-gas formalism. Employment of an energy-dependent level density parameter a, based on microscopic corrections from a recent FRDM mass formula, and a backshift δ, based on pairing and shell corrections, leads to a highly improved fit of level densities at the neutron-separation energy in the mass range 20 ≤ A ≤ 245. The importance of using proper microscopic corrections from mass formulae is emphasized. The resulting level description is well suited for astrophysical applications.The level density can also provide clues to the applicability of the statistical model which is only correct for a high density of excited states. Using the above description, one can derive a "map" for the applicability of the model to reactions of stable and unstable nuclei with neutral and charged particles.

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“…Although there have been successful calculations incorporating all reaction mechanisms [102,103,104] and explaining differences between resonance and activation measurements [105,106] without modification of the potential, this conceivable complication should be kept in mind. In consequence, it is very important to have measurements directly in the relevant energy range.…”

Section: Transition Regions With Intermediate Level Densitiesmentioning

confidence: 99%

Cross section predictions for hydrostatic and explosive burning

Descouvemont

Rauscher

2006

Nuclear Physics A

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We review different models used for reactions involved in nuclear astrophysics. The reaction rate is defined for resonant as well as for non-resonant processes. For lowdensity nuclei, we describe the DWBA method, the potential model, the R-matrix method, and microscopic cluster models. The statistical model is developed for high-level densities. Details of calculations in the low-and high-density regimes are illustrated with new results concerning transfer reactions and level densities.

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Neutron-induced nucleosynthesis

Cited by 10 publications

References 104 publications

Dependence of direct neutron capture on nuclear-structure models

Dependence of direct neutron capture on nuclear-structure models

Nuclear level density and the determination of thermonuclear rates for astrophysics

Cross section predictions for hydrostatic and explosive burning

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