Neutron multiplicity measurements of Cf and Fm isotopes

Hoffman, Darleane C.; Ford, George P.; Balagna, J.P.; Veeser, L. R.

doi:10.1103/physrevc.21.637

Cited by 45 publications

(22 citation statements)

References 8 publications

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“…7) and for ^^''Fm (see (8) where e is the electron chaige, Zjj (ZL) the chaige of the heavy (light) fragment, and dch the distance between fragment centers of charge at scission. 5-6.…”

Section: Resultsmentioning

confidence: 99%

Fission Fragment Properties from a Microscopic Approach

Dubray¹,

Goutte²,

Delaroche³

et al. 2008

AIP Conference Proceedings

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We calculate potential energy surfaces in the elongation-asymmetry plane, up to very large deformations, with the Hartree-Fock-Bogoliubov method and the Gogny nucleon-nucleon effective interaction DIS, for the ^^^Th and 256,258,260pj^ fissioning systems. We then define a criterion based on the nuclear density, in order to discriminate between pre-and postscission configurations. Using this criterion, many scission configurations are identified, and are used for the calculation of several fragment properties, like fragment deformations, deformation energies, energy partitioning, neutron binding energies at scission, charge polarization, total fragment kinetic energies and neutron multiplicities.

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“…7) and for ^^''Fm (see (8) where e is the electron chaige, Zjj (ZL) the chaige of the heavy (light) fragment, and dch the distance between fragment centers of charge at scission. 5-6.…”

Section: Resultsmentioning

confidence: 99%

Fission Fragment Properties from a Microscopic Approach

Dubray¹,

Goutte²,

Delaroche³

et al. 2008

AIP Conference Proceedings

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“…This is due to the increased yield of symmetric mass division with high TKE which means there is less energy left for prompt neutron and photon emission from the fragments. Early measurements [59] of prompt neutrons in coincidence with fission fragments were performed using a large Gd-loaded liquid scintillation detector and solid-state detectors to study neutron emission, multiplicities, and variances as a function of fragment mass ratio and TKE for several Cf and Fm isotopes. These studies showed that the neutron multiplicities vary greatly for these isotopes as a function of mass split and TKE.…”

Section: Prompt Neutron and Gamma-ray Emissionmentioning

confidence: 99%

Spontaneous Fission

Hoffman

Lane

1995

Radiochimca Acta

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Recent experimental results for spontaneous fission half-lives and fission fragment mass and kinetic-energy distributions and other properties of the fragments are reviewed and compared with recent theoretical models. The experimental data lend support to the existence of the predicted deformed shells near Z= 108 and Ν =162. Prospects for extending detailed studies of spontaneous fission properties to elements beyond hahnium (element 105) are considered.

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“…It should be noted that the high-TKE component (∼ 235 MeV) in the symmetric mass division was first shown in SF of 257 Fm by Balagna et al [23,42]. The correlation among the neutron multiplicity, fragment TKE and mass-yield distributions in the various SF systems was also vigorously investigated by Hoffman et al [43].…”

Section: Total Kinetic Energy (Tke) Distribution Of Fission Fragmentsmentioning

confidence: 99%

Two-mode fission – experimental verification and characterization of two fission-modes

Nagame

Nakahara

2012

Radiochimica Acta

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Summary.Experimental verification and characterization of the two-mode fission are reviewed. The presence of two independent deformation-paths in low energy fission of actinides is demonstrated by studying correlation among saddle-point configurations, scission-point configurations, and mass-yield distributions; the elongated scission configuration is related with the fission process that goes over a higher threshold energy and results in a symmetric mass-division mode, while the compact scission configuration with the process that experiences a lower threshold ends up with an asymmetric mass-division mode. Based on an extensive systematic analysis of scission properties in a wide range of actinide fission, the bimodal fission observed in the spontaneous fission of the heavy actinides is interpreted as the result of the presence of two fission paths, namely, the ordinary asymmetric fission path and a strongly shell-influenced symmetric mode.

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Neutron multiplicity measurements of Cf and Fm isotopes

Cited by 45 publications

References 8 publications

Fission Fragment Properties from a Microscopic Approach

Fission Fragment Properties from a Microscopic Approach

Spontaneous Fission

Two-mode fission – experimental verification and characterization of two fission-modes

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