Neutron evaporation and level densities in excited nuclei

Couteur, K. J. Le; Lang, D.W.

doi:10.1016/0029-5582(59)90136-1

Cited by 253 publications

(30 citation statements)

References 19 publications

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“…In Figure 3, the laboratory spectra, calculated by using Eqs. (12) to (14), are illustrated. Figure 4 shows the ratio of laboratory spectra to Watt spectrum.…”

Section: Calculationsmentioning

confidence: 99%

Prompt fission neutron energy spectrum of $^{252}Cf$ in center of mass and laboratory systems

Koçak¹,

Ahmadov²

2017

Turk J Phys

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Abstract:In this work we discuss the influence of different forms of prompt fission neutron energy spectra in the fission fragment center of mass system on the laboratory spectrum of neutrons in spontaneous fission of 252 Cf . We show that the Le Couteur spectrum, which takes into account multiple neutron emission of neutrons in the center of mass system, describes the observed neutron energy spectrum well when transformed to the laboratory system.

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“…In Figure 3, the laboratory spectra, calculated by using Eqs. (12) to (14), are illustrated. Figure 4 shows the ratio of laboratory spectra to Watt spectrum.…”

Section: Calculationsmentioning

confidence: 99%

Prompt fission neutron energy spectrum of $^{252}Cf$ in center of mass and laboratory systems

Koçak¹,

Ahmadov²

2017

Turk J Phys

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“…Here, Θ is the nuclear temperature (in MeV) and is related to the excitation energy E * by the following statistical expression [22]:…”

Section: Fission-fragment Yieldmentioning

confidence: 99%

Analysis of fission-fragment mass distribution within the quantum-mechanical fragmentation theory

Singh

Kaur

2016

Eur. Phys. J. A

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Abstract. The fission-fragment mass distribution is analysed for the 208 Pb( 18 O, f ) reaction within the quantum-mechanical fragmentation theory (QMFT). The reaction potential has been calculated by taking the binding energies, Coulomb potential and proximity potential of all possible decay channels and a stationary Schrödinger equation has been solved numerically to calculate the fission-fragment yield. The overall results for mass distribution are compared with those obtained in experiment. Fine structure dips in yield, corresponding to fragment shell closures at Z = 50 and N = 82, which are observed by Bogachev et al., are reproduced successfully in the present calculations. These calculations will help to estimate the formation probabilities of fission fragments and to understand many related phenomena occurring in the fission process.

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“…In these two cases, the temperature parameter "t" is just the temperature of the daughter nucleus after single neutron emission 9 Remington et al [-15] point out that if the source is in a very excited state at an excitation energy per nucleon near to or exceeding the neutron binding energy, volume emission with ~ = 1/2 is most probable 9 If the source emits more than one neutron, the proper choice [14,15] would be a=5/ 11 -~ 1/2, and then "t" is an effective temperature parameter related to the temperature Tof the daughter nucleus after the first neutron emission by T=(12/ ll)t.…”

Section: Analysis Of the Neutron Spectramentioning

confidence: 99%

“…A general expression for the energy spectrum of evaporated nucleons from a "hot nucleus" is according to Le Couteur and Lang [14] N (E.) < (E.) ~ exp ( -E./t).…”

Section: Analysis Of the Neutron Spectramentioning

confidence: 99%

“…Due to uncertainties in the efficiency of the neutron detectors at low energy, the lowest neutron energy point used in the fitting procedure was 2 MeV. To check that the fits are reasonable, the effective temperature for neutron cascades from the compound nucleus was also calculated for each projectile energy from the formula [14] T= (11/12)(E*/a)1/2.…”

Section: Analysis Of the Neutron Spectramentioning

confidence: 99%

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Non-equilibrium neutron emission in ?-induced reactions on124Sn

Arnell

Mattsson

Roth

et al. 1988

Z. Physik A - Atomic Nuclei

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Neutron time-of-flight spectra were measured in coincidence with y-rays characteristic for the xn (x=2, 3, 4, 5) fusion-like products in reactions of 35-57 MeV a-particles with 124Sn. Additional information was obtained from excitation function and 7-multiplicity measurements. The neutron energy spectra for a specific x n channel at high bombarding energies clearly show the presence of nonequilibrium neutron emission. The spectra are parameterized in terms of emission from a slow equilibrated and a fast moving source. The fast moving source has a velocity close to the beam velocity indicating a close relationship between the movement of the projectile and the neutron emission.

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Neutron evaporation and level densities in excited nuclei

Cited by 253 publications

References 19 publications

Prompt fission neutron energy spectrum of $^{252}Cf$ in center of mass and laboratory systems

Prompt fission neutron energy spectrum of $^{252}Cf$ in center of mass and laboratory systems

Analysis of fission-fragment mass distribution within the quantum-mechanical fragmentation theory

Non-equilibrium neutron emission in ?-induced reactions on124Sn

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