Mass and charge distributions in the very asymmetric mass region of the neutron induced fission of

Tsekhanovich, I.; Denschlag, H. O.; Davi, M.; Büyükmumcu, Zeki; Gönnenwein, F.; Oberstedt, S.; Faust, H.

doi:10.1016/s0375-9474(00)00586-8

Cited by 40 publications

(23 citation statements)

References 20 publications

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“…The even-odd effect of the odd-Z fissioning systems at large asymmetry follows the general behaviour of the even-Z fissioning systems. Their values are very close to those of the neighbouring even-Z systems, as was reported already in [26]. In the inversekinematics data, where the heavier part of the fragment distribution has been measured, the even-odd staggering was found to be negative for heavy fragments, revealing a higher probability for the unpaired proton to end up in the heavy fragment.…”

Section: Local Even-odd Staggering In Odd-z Fissioning Systemssupporting

confidence: 87%

Evidence for the predominant influence of the asymmetry degree of freedom on the even–odd structure in fission-fragment yields

Caamaño

Rejmund

Schmidt

2011

J. Phys. G: Nucl. Part. Phys.

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Abstract. Based on a comprehensive set of fission-fragment distributions measured in low-energy fission, the even-odd staggering in the fission-fragment element yields is investigated. The well-established evolution of the global even-odd effect with the fissioning system is found to be only a partial aspect of the even-odd structure. Indeed, it is shown that the global even-odd effect varies systematically with the mean asymmetry of the fission-fragment distribution, and that the general increase of the even-odd staggering with asymmetry depends on the fissioning system. Thus, the dependency of the even-odd effect with the fissioning system is accredited in part to the asymmetry evolution of the charge distribution, and not solely to the dissipated energy as it has been done earlier. This interpretation is strongly supported by data measured in inverse kinematics, which cover the complete fission-fragment charge distribution and include precise yields at symmetry. The relevance of the ordering parameter for the description the even-odd effect in fission-fragment yields as a general property is explored.PACS numbers: 24.75.+i, 25.85.Ec, 25.85.Jg

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Section: Local Even-odd Staggering In Odd-z Fissioning Systemssupporting

confidence: 87%

Evidence for the predominant influence of the asymmetry degree of freedom on the even–odd structure in fission-fragment yields

Caamaño

Rejmund

Schmidt

2011

J. Phys. G: Nucl. Part. Phys.

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“…The even-odd effect of the odd Z fissioning systems at large asymmetry follows the general behaviour of the even Z fissioning systems. Their values are very close to those of the neighbouring even Z systems, as was reported already in [13]. As discussed in the previous section, the even-odd effect in odd Z fissioning system can only be understood by a higher probability for the unpaired proton to end up in the heavy fragment.…”

Section: -P2supporting

confidence: 88%

“…In the heavier part of the fragment distribution, the even-odd staggering was found to be negative, revealing a higher probability for the unpaired nucleon to end up in the heavy fragment. The same observation of large even-odd effect has been reported in thermal-neutron induced fission of 237 Np [13], and 242m Am [14]. The observation of an even-odd staggering for odd-Z fissioning nuclei reveals that the relation between the amplitude of the even-odd staggering in fission-fragment charge yields and the intrinsic excitation energy at scission is not as direct as depicted in the standard understanding as discussed above.…”

Section: -P2supporting

confidence: 70%

Influence of asymmetry and fissility on even-odd effect in fission-fragment yields

Caamaño

Rejmund

Schmidt

2010

EPJ Web of Conferences

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Abstract. Based on a wide systematics of fragment distributions measured in thermalneutron induced fission, the even-odd staggering in the fission-fragment element yields is investigated. The asymmetry evolution of the element yield distribution with the fissility of the fissioning nucleus is shown to be for an important part responsible for the decrease of the even-odd staggering with the fissility. The even-odd staggering close to symmetry is shown to be a small contribution to the global even-odd effect, and seems to vary little with the fissility of the nucleus. These experimental observations show that the established interpretation in which the intrinsic excitation energy at scission is accountable for the even-odd staggering amplitude has to be reconsidered.

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“…Sn clusters was also extracted from the steep decrease of the yields to lower masses in the light and the heavy fragments, respectively [27,28].…”

Section: Brief Review On Experimental Knowledge and Theoretical Modelsmentioning

confidence: 99%

Experimental evidence for the separability of compound-nucleus and fragment properties in fission

Schmidt¹,

Kelić²,

Ricciardi³

2008

Europhys. Lett.

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Abstract:The large body of experimental data on nuclear fission is analyzed with a semiempirical ordering scheme based on the macro-microscopic approach and the separability of compound-nucleus and fragment properties on the fission path. We apply the statistical model to the non-equilibrium descent from saddle to scission, taking the influence of dynamics into account by an early freeze out. The present approach reveals a large portion of common features behind the variety of the complex observations made for the different systems. General implications for out-of-equilibrium processes are mentioned.

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Mass and charge distributions in the very asymmetric mass region of the neutron induced fission of

Cited by 40 publications

References 20 publications

Evidence for the predominant influence of the asymmetry degree of freedom on the even–odd structure in fission-fragment yields

Evidence for the predominant influence of the asymmetry degree of freedom on the even–odd structure in fission-fragment yields

Influence of asymmetry and fissility on even-odd effect in fission-fragment yields

Experimental evidence for the separability of compound-nucleus and fragment properties in fission

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