MASS AND ISOTOPIC YIELDS FOR THE REACTION 245Cm(nTH,f) MEASURED AT LOHENGRIN

Rochman, D.; Faust, H.; Tsekhanovich, I.; Oberstedt, S.; Sokolov, V. E.; Gönnenwein, F.; Storrer, F.; Haas, F.X.

doi:10.1142/9789812776723_0022

Cited by 3 publications

(5 citation statements)

References 4 publications

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“…Precise information has been obtained for the light part of the asymmetric fission-fragment distribution [1,[9][10][11][16][17][18][19][20][21]. They coincide with a heavy charge distribution centred on a constant value Z = 54, independently of the fissioning nucleus, as was already reported in [22].…”

Section: -P2supporting

confidence: 57%

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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Section: -P2supporting

confidence: 57%

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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“…However, for the latter, until an experiment exploiting inverse kinematics [13], only the light part of the distribution was experimentally accessible. Element-yield distributions reported in figure 2 have been obtained at the Lohengrin spectrometer [2,14,3,15,16,17,18,19,20]. For this particular experimental procedure, only the light fragment distributions were measured.…”

Section: Global Even-odd Staggering and Dissipated Energymentioning

confidence: 99%

“…However, in this last case, until the recent application of the inverse kinematics technique [10], only the light part of the distribution was accessible experimentally. Element-yield distributions reported in figure 2 have been obtained at the Lohengrin spectrometer [2,11,12,13,14,15,16,17,18]. For this particular experimental procedure, the element yields for which the complete isotopic distribution could be measured have been selected.…”

Section: Evolution Of the Fragment Distribution With The Fissioning N...mentioning

confidence: 99%

“…The local even-odd staggering δ(Z) is a measure of the deviation of the nuclear-charge distribution from a smooth behaviour, and is usually studied following the prescription of Tracy et al [23]. For different fissioning systems [2,11,12,13,14,15,16,17,18], the even-odd staggering has been shown to be larger for large asymmetry. This experimental observation is reproduced in figure 4 in a comprehensive view.…”

Section: Local Even-odd Staggering and Influence Of The Asymmetrymentioning

confidence: 99%

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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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“…However, experimental information on the heavy Z distribution is very scarce, due to the technical difficulties that arise from the detection of heavy fission fragments. Precise information has been obtained at the Lohengrin spectrometer, where isotopic and therefore Z distributions could be measured for the light part of the asymmetric fission-fragment distribution [1,7,8,12,13,14,15,16,17]. They are reported in Figure 1, left.…”

Section: Evolution Of the Z Distribution With Fissility And Its Consementioning

confidence: 99%

Revisiting the even-odd staggering in fission-fragment yields

Caamaño¹,

Rejmund²,

Schmidt³

et al. 2009

AIP Conference Proceedings

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The even-odd staggering observed in the experimental fission-fragment nuclear-charge yields is investigated over a wide systematics of fission fragments measured at Lohengrin in direct kinematics and at GSI in inverse kinematics. The general increase of the even-odd staggering in the fission-fragment charge yields towards asymmetric charge splits is explained by the absorption of the unpaired nucleons by the heavy fragment. As a consequence, the well established trend of evenodd staggering in the fission fragment charge yields to decrease with the fissility is attributed in part to the asymmetry evolution of the charge distribution. This interpretation is strongly supported by the data measured at GSI, which cover the complete charge distribution and include precise yields at symmetry. They reveal that the even-odd effect around symmetry remains constant over a large range of fissility.

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MASS AND ISOTOPIC YIELDS FOR THE REACTION ²⁴⁵Cm(n_TH,f) MEASURED AT LOHENGRIN

Cited by 3 publications

References 4 publications

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

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

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

Revisiting the even-odd staggering in fission-fragment yields

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