A unified model of preequilibrium decay

Ernst, J.; Rao, J. Rama

doi:10.1007/bf01408624

Cited by 36 publications

(9 citation statements)

References 10 publications

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“…From these comparisons, we will draw conclusions as to the practical importance of the more consistent formulation. The formal discussion of this topic was first presented by Ernst and Ramo Rao [7], with further discussion by Bisplinghoff [4]. Here our emphasis is solely on the practical importance of the simpler versus the more rigorous approach.…”

Section: E=e--u--s=e--smentioning

confidence: 99%

Numerical test of approximations in the hybrid precompound decay model

Blann

Bisplinghoff

1987

Z. Physik A - Atomic Nuclei

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Dedicated to Professor Thco Mayer-Kuckuk on the occasion of his 60th birthday We review inconsistencies in expressions which are used for exciton distribution functions in precompound decay models utilizing the Ericson type of partial state density. We then compare results of one formulation, the hybrid model, with and without corrected distribution functions for the second hierarchy of configurations. Results are shown for 93Nb(n, n') and (n, p) reactions at 14.7, 45 and 90 MeV incident nucleon energies. The corrected distribution functions change hybrid model predictions by less than 10% for angle integrated spectra, but certain cases are discussed for which the improved treatment should be used due to larger errors from the use of the Ericson expression.

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Section: E=e--u--s=e--smentioning

confidence: 99%

Numerical test of approximations in the hybrid precompound decay model

Blann

Bisplinghoff

1987

Z. Physik A - Atomic Nuclei

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“…approaches it is obvious that (14a) and (14b) should be used in calculating the quantity D, T, ~, defined by (9) and (8). The quantities D, T, ~ in the exciton model may be compared best with the ones used in the hybrid model of a closed form for the corresponding exciton model quantities is derived.…”

Section: P(n O) = 3mentioning

confidence: 99%

“…A discussion of using (2) throughout the equilibration process has been given in [8]. The emission rate into the continuum 2c(0 is derived from detailed balance.…”

Section: Exciton Picturementioning

confidence: 99%

“…However, different formulations of pre-equilibrium models are based on different physical assumptions and approximations. The proponents of different approaches have had a controversial discussion in a series of papers [4][5][6][7][8]. It is the aim of this work to discuss some more details of pre-equilibrium models and therefore perhaps help to enlighten the physics involved.…”

Section: Introductionmentioning

confidence: 99%

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On the validity of pre-equilibrium model assumptions

Machner

1981

Z Physik A

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“…The particles are referred to as pre-equilibrium particles. The pre-equilibrium process was firstly formulated in a model by Griffin [1] that afterwards gave rise to a large number of successful refinements [2][3][4][5][6][7][8][9][10][11][12][13]. The various pre-equilibrium theories differ appreciably in their flexibility and mathematical rigor.…”

Section: Introductionmentioning

confidence: 99%

Measurement and analysis of excitation functions for alpha-particle-induced reactions in rhenium

Singh¹,

Gadkari²

2004

Can. J. Phys.

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Excitation functions of the reactions 185 Re [(α,n); (α,2n); (α,3n)] and 187 Re [(α,n); (α,2n); (α,3n); (α,4n)] were investigated up to 50 MeV using the stacked-foil activation technique and high-purity germanium γ -ray spectroscopy method. Since the natural rhenium used as a target has two odd-mass stable isotopes of abundance 37.4% ( 185 Re) and 62.6% ( 187 Re), their activation in some cases gives the same residual nucleus through different reaction channels, but with very different Q values. In such cases, the individual reaction cross sections are separated with the help of the ratio of theoretical cross sections. The experimental cross sections were compared with the theoretical predictions considering equilibrium as well as pre-equilibrium contributions using code ALICE/90. It was found that the initial exciton configuration n 0 = 4 (4p0h) appears to give a good fit to the experimental data. To the best of our knowledge, the excitation functions for 185 Re[(α,n); (α,2n); (α,3n)] and 187 Re[(α,3n); (α,4n)] reactions were measured for the first time.Résumé : Utilisant une méthode d'activation en feuille et des mesures HPGe des rayons γ , nous étudions les fonctions d'excitation des réactions 185 Re[(α,n) ; (α,2n) ; (α,3n)] et 187 Re[(α,n) ; (α,2n) ; (α,3n) ; (α,4n)] . Parce que le rhénium naturel utilisé comme cible a deux isotopes impairs stables de 37,4% ( 185 Re) et 62,6% ( 187 Re) d'abondance respectivement, leur activation dans certains cas donne le même noyau résiduel via des canaux de réaction différents, mais avec des valeurs de Q très différentes. Dans de tels cas, nous séparons les sections efficaces des réactions individuelles avec l'aide des rapports théoriques des sections efficaces. Les sections efficaces ont été comparées avec celle prédites expérimentalement dans le cas d'équilibre et de pré-équilibre en utilisant le code ALICE/90. Nous trouvons que la configuration initiale d'excitation n 0 = 4 (4p0h) semble mener à un bon accord avec l'expérience. Au mieux de notre connaissance, c'est la première fois que sont mesurées les fonctions d'excitation pour les réactions 185 Re[(α,n) ; (α,2n) ; (α,3n)] et 187 Re [(α,3n) ; (α,4n)].[Traduit par la Rédaction]

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A unified model of preequilibrium decay

Cited by 36 publications

References 10 publications

Numerical test of approximations in the hybrid precompound decay model

Numerical test of approximations in the hybrid precompound decay model

On the validity of pre-equilibrium model assumptions

Measurement and analysis of excitation functions for alpha-particle-induced reactions in rhenium

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