Dynamic model for alpha particle emission during fission

Tanimura, O.; Fließbach, Torsten

doi:10.1007/bf01289634

Cited by 9 publications

(5 citation statements)

References 17 publications

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“…As a result, particles can be emitted at a short time, comparable to the scission time [13]. Our results suggest that this is the case for light particles accompanying spontaneous fission.…”

Section: Introductionmentioning

confidence: 72%

Polar light charged particles accompanying spontaneous fission

Srokowski¹,

Szczurek²,

Budzanowski³

1989

Z. Physik A - Atomic Nuclei

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Simple model of emission of light charged polar particles accompanying fission of heavy nuclei is presented. We assume the emission from the whole surface of fragments after scission, taking into account the influence of the accompanying fragment. The initial energy and time of emission are treated phenomenolog~cally. The motion of tight particles and fission fragments are subsequently calculated in the framework of classical dynamics. We get a good agreement with experimental data if we assume a prompt emission. The possibility of the connection with giant resonances is discussed. PACS: 25.85.Ca

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Section: Introductionmentioning

confidence: 72%

Polar light charged particles accompanying spontaneous fission

Srokowski¹,

Szczurek²,

Budzanowski³

1989

Z. Physik A - Atomic Nuclei

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“…In [12] all low-energy protons are supposed to be due to background and the remaining pretations of scission-point emission should not be confined to classical trajectory simulations but also include quantum-mechanical calculations. An adaptation of such calculations as performed for ~-emission in [24] to proton release would be extremely useful.…”

Section: Conclusion On the Emission Mechanismmentioning

confidence: 99%

Light charged particle release in252Cf spontaneous fission: Tripartition versus fragment de-excitation

Schubert¹,

Hutsch²,

Möller³

et al. 1992

Z. Physik A - Hadrons and Nuclei

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Double-differential emission probabilities P(E, 0) in angle 0 and energy E of protons, tritons, and e-particles were measured in the case of spontaneous fission of 252Cf. A detector system consisting of position-sensitive parallel-plate avalanche counters (PPAC) and A E--Etelescopes allowed a coincidence measurement of fission fragments (FF) and light charged particles (LCP) in the whole region from 0 deg. to 180 deg. with respect to the light-fragment direction. Previous results for e-particle emission were confirmed. The background contributions for protons are discussed in detail. For proton emission the background arising from (n, p)-reactions was measured and compared with a corresponding Monte-Carlo simulation of elastic (n, p)-collisions. Unlike for tritons and e-particles the P(E, 0) distribution for protons does not show equatorial peaking in 0 between 80 deg. and 90 deg. and contradicts classical scission point emission. The proton distribution, however, agrees with fragment de-excitation calculations in the framework of the cascade evaporation model (CEM) whereas an analogous calculation for e-particles completely fails. Upper limits for an additional scission component of proton emission are given.

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“…. (13) Other reasonable assumptions about where the LCP is formed and what fraction of the LCP comes from which of the parent fragments do not significantly affect the result. Table II contains a comparison of the particle binding energies for various Z=1 to 12 particles generated between the nascent fragments of a 242 Pu system at the moment of scission, estimated using the three approaches discussed above.…”

Section: Iia Particle Binding Energiesmentioning

confidence: 99%

“…However, the initial suggestion of Halpern has not been used to obtain a quantitative description of ternary fission, and many other dynamical models have been developed. These include models involving an extension of the theory of particle emission from actinide ground states to a rapidly evolving system in the last phase of the fission process [11], double-neck rupture [12], models where α particles inside the neck region gain energy from the average timedependent potential of a fissioning system [13,14], and other dynamical models reviewed in ref. [6].…”

Section: Introductionmentioning

confidence: 99%

An Evaporation-Based Model of Thermal Neutron Induced Ternary Fission of Plutonium

Lestone

2008

Int. J. Mod. Phys. E

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Ternary fission probabilities for thermal neutron induced fission of plutonium are analyzed within the framework of an evaporation-based model where the complexity of time-varying potentials, associated with the neck collapse, are included in a simplistic fashion. If the nuclear temperature at scission and the fission-neck-collapse time are assumed to be ~1.2 MeV and ~10−22 s, respectively, then calculated relative probabilities of ternary-fission light-charged-particle emission follow the trends seen in the experimental data. The ability of this model to reproduce ternary fission probabilities spanning seven orders of magnitude for a wide range of light-particle charges and masses implies that ternary fission is caused by the coupling of an evaporation-like process with the rapid re-arrangement of the nuclear fluid following scission.1 LA-UR-05-8860

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Dynamic model for alpha particle emission during fission

Cited by 9 publications

References 17 publications

Polar light charged particles accompanying spontaneous fission

Polar light charged particles accompanying spontaneous fission

Light charged particle release in252Cf spontaneous fission: Tripartition versus fragment de-excitation

An Evaporation-Based Model of Thermal Neutron Induced Ternary Fission of Plutonium

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