A new systematics of fragment total kinetic energy release in fission

Tavares, O. A. P.; Terranova, Maria Letizia

doi:10.1007/bf02730778

Cited by 11 publications

(8 citation statements)

References 35 publications

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“…This effect is observed experimentally and is reproduced by the solid curve in Fig. 8, which is calculated using [41]:…”

Section: Energy Spectrasupporting

confidence: 58%

“…A linear relationship between the most probable TKE release value with Z 2 /A 1/3 of the fissioning nucleus has been established by the systematic work of Viola et al [40], with this systematics more recently extended to the lighter systems in ref. [41]. The compiled T KE values [42] of the symmetric fission fragments produced in light heavy-ion systems are shown in Fig.…”

Section: Energy Spectramentioning

confidence: 99%

“…Most probable TKE release in fission as a function of the parameter Z 2 /A 1/3 of the fissioning nucleus. Open triangles have been taken from previous existing compilations[40,41].Experimental solid points have been recently compiled in ref [42]…”

mentioning

confidence: 99%

“…. The dashed line is the result of the Viola systematics[41]. The solid line shows the revised systematics of Tavares and Terranova[42].…”

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confidence: 99%

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Binary decay of light nuclear systems

1999

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A review of the characteristic features found in fully energy-damped, binarydecay yields from light heavy-ion reactions with 20 ≤ A target + A projectile ≤ 80 is presented. The different aspects of these yields that have been used to support models of compound-nucleus (CN) fission and deep-inelastic dinucleus orbiting are highlighted. Cross section calculations based on the statistical phase space at different stages of the reaction are presented and compared to the experimental results. Although the statistical models are found to reproduce most of the observed experimental behaviors, an additional reaction component corresponding to a heavy-ion resonance or orbiting mechanism is also evident in certain systems. The system dependence of this second component is discussed. The extent to which the binary yields in very light systems (A CN ≤ 32) can be viewed as resulting from a fusion-fission mechanism is explored. A number of unresolved questions, such as whether the different observed behaviors reflect characteristically different reaction times, are discussed. I. INTRODUCTIONAs the interaction energy for a heavy-ion reaction increases above the Coulomb barrier, the reaction grazing angle moves to more forward angles so that, by a value of about 20% above the barrier, very small quasielastic and single-nucleon transfer reaction yields are expected at larger scattering angles. Instead, the incident flux that might be expected to scatter to larger angles, corresponding to smaller impact parameters, is trapped by the formation of a compound nucleus. For lighter systems, this compound system subsequently decays by light particle and γ-ray emission, with a very small heavy-fragment (A > 4) emission component. The experimental observation of significant large-angle, elastic-scattering cross sections at energies well above the Coulomb barrier has therefore been viewed with Calculation of fission cross sections in the statistical models is based on the Hauser-Feshbach formalism. For a compound nucleus of spin J that is populated with a partial fusion cross section of σ J , the partial fission cross section is given in terms of the ratio of the fission decay width Γ f is J to the total decay width for this spin Γ tot J , with

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“…This effect is observed experimentally and is reproduced by the solid curve in Fig. 8, which is calculated using [41]:…”

Section: Energy Spectrasupporting

confidence: 58%

Section: Energy Spectramentioning

confidence: 99%

mentioning

confidence: 99%

“…. The dashed line is the result of the Viola systematics[41]. The solid line shows the revised systematics of Tavares and Terranova[42].…”

mentioning

confidence: 99%

See 2 more Smart Citations

Binary decay of light nuclear systems

1999

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“…There exists an experimentally explored fission process of some trans-Bk isotopes, for which cases the mass region of the fission fragments is located nearby the doubly magic 132 Sn isotope. In this process, the fragments possess a high kinetic energy compared to the systematic increase observed in ordinary fission processes [77,79]-the bimodal fission process [77]. In some cases, the fragment mass distributions have been experimentally determined.…”

Section: Comparison With Experimentsmentioning

confidence: 99%