Collinear cluster tri-partition of 252Cf (sf) and in the 235U (nth, f ) reaction

Pyatkov, Yu. V.; Kamanin, D. V.; Oertzen, W. von; Alexandrov, A. A.; Alexandrova, I. A.; Falomkina, O. V.; Kondratjev, N. A.; Kopatch, Yu. N.; Кузнецова, Е. А.; Lavrova, Yu. E.; Tyukavkin, A. N.; Trzaska, W. H.; Zhuhcko, V. E.

doi:10.1140/epja/i2010-10988-8

Cited by 85 publications

(121 citation statements)

References 23 publications

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“…True ternary fission of heavy nuclei, which has been discovered in the experiments recently, occurs with much smaller probability (∼ 10 −3 ) compared to the binary fission [1][2][3][4]. These experimental studies of the decays in 252 Cf(sf,fff) [1] and 235 U(n th ,fff) [4] reactions with two fission fragment coincidences with two FOBOS-detectors [1] placed at 180…”

Section: Introductionmentioning

confidence: 94%

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Theoretical study of the almost sequential mechanism of true ternary fission

et al. 2015

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Section: Introductionmentioning

confidence: 94%

“…These experimental studies of the decays in 252 Cf(sf,fff) [1] and 235 U(n th ,fff) [4] reactions with two fission fragment coincidences with two FOBOS-detectors [1] placed at 180…”

Section: Introductionmentioning

confidence: 99%

Theoretical study of the almost sequential mechanism of true ternary fission

et al. 2015

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“…On the other hand, ternary fission of 56 Ni -related to its HD shapes -was identified from out-of-plane angular correlations measured in the 32 S+ 24 Mg reaction with the Binary Reaction Spectrometer (BRS) at the Vivitron Tandem facility of the IPHC, Strasbourg [48]. This finding [48] is not limited to light N =Z compound nuclei, true ternary fission [15,17,49] can also occur for very heavy [17,49] and superheavy [50] nuclei.…”

Section: Alpha Clustering Nuclear Molecules and Large Deformationsmentioning

confidence: 99%

New Horizons in Fundamental Physics

Schramm¹,

Schäfer²

2017

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Fig. 1. Different types of clustering in nuclei that have been discussed the last two decades [2].A great deal of research work has been undertaken in α-clustering study since the pioneering discovery of 12 C+ 12 C molecular resonances half a century ago. Our knowledge on physics of nuclear molecules has increased considerably and nuclear clustering remains one of the most fruitful domains of nuclear physics, facing some of the greatest challenges and opportunities in the years ahead. The occurrence of "exotic" shapes in light N =Z α-like nuclei is investigated. Various approaches of the superdeformed and hyperdeformed bands associated with quasimolecular resonant structures are presented. Evolution of clustering from stability to the drip-lines is examined: clustering aspects are, in particular, discussed for light exotic nuclei with large neutron excess such as neutron-rich Oxygen isotopes with their complete spectroscopy.

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“…Recent experiments for the spontaneous decay of 252 Cf(fff) and of neutron induced fission in 235 U(n,fff), using the missing mass approach with two FOBOS-detectors in coincidence at 180 o , see ref. [1,2], true ternary fission has been observed with the missing mass method. In this new kind of radioactive fission decay, the so called collinear cluster tripartition (CCT), the three fragments are emitted collinear, here typical fragments are isotopes of Sn, Ni, and Ca.…”

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“…The collinear fragments can be separated by a specific experimental effect. In the experiments [1], an angular dispersion is created by a foil in the direction of one of the detector arms, arm1, for the two fragments A2 and A3. The resulting angular opening of the two vectors of these two fragments allows the blocking of one of the fragments in a specific blocking structure in the detectors.…”

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Dynamics of collinear ternary fission in the fragmentation of²⁵²Cf

Oertzen

Vijayaraghavan

Balasubramaniam

2014

EPJ Web of Conferences

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Abstract. With the observation of the collinear cluster tripartition in 252 Cf, we discuss various features of the true ternary fission (collinear fission). The conditions for collinear ternary decay with three clusters are explained. We discuss the potential energy surfaces for ternary decay and conditions for the collinear decay. Collinear ternary fissionTernary fission with comparable masses is a process which occurs in heavy nuclei under conditions of large values of Z 2 /A, called the fission-parameter. The decay into three fragments (true ternary fission) observed is found to be collinear. Recent experiments for the spontaneous decay of 252 Cf(fff) and of neutron induced fission in 235 U(n,fff), using the missing mass approach with two FOBOS-detectors in coincidence at 180 o , see ref. [1,2], true ternary fission has been observed with the missing mass method. In this new kind of radioactive fission decay, the so called collinear cluster tripartition (CCT), the three fragments are emitted collinear, here typical fragments are isotopes of Sn, Ni, and Ca. The latter, Ca, as the third particle is positioned along the line connecting Sn and Ni. This exotic decay can be understood as a breakup of very elongated (hyper-deformed) shapes with two neck ruptures.From three different experiments reported in ref.[1, 2] on CCT, an overall yield of 4× 10 −3 /(binary fission) has been observed. This result has been considered to have unusually high values, when compared with the previously known yields in "ternary fission" with the emission of lighter fragments perpendicular to the fission axis [3,4].This high probability can be explained if the phase space for the CCT-decay is considered (see also [5,6]). The phase space depends on, i)the potential energy surfaces (PES), ii) the Q-values, the latter determining the number of possible isotope combinations, iii) the excitation energy range in the individual fragments, iv) the momentum range, v) the number of excited states (density of states) in combinations consisting of 2(3) isotopes, vi) the number of excited states in each fragment, and vii) the spin (J) multiplicity in these states with spins up to (6-8) + (phase space factor (2J+1)). Fragments with odd numbers of protons and/or neutrons have in addition a particular large density of states.The question of the relative importance of fission through oblate or prolate shapes (chain configurations) has been addressed repeatedly [7][8][9]. Within the three cluster model, it has been shown, that the collinear configuration is the favoured mode over the oblate configuration [9] for the ternary a

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Collinear cluster tri-partition of 252Cf (sf) and in the 235U (nth, f ) reaction

Cited by 85 publications

References 23 publications

Theoretical study of the almost sequential mechanism of true ternary fission

Theoretical study of the almost sequential mechanism of true ternary fission

New Horizons in Fundamental Physics

Dynamics of collinear ternary fission in the fragmentation of²⁵²Cf

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Collinear cluster tri-partition of 252Cf (sf) and in the 235U (nth, f ) reaction

Cited by 85 publications

References 23 publications

Theoretical study of the almost sequential mechanism of true ternary fission

Theoretical study of the almost sequential mechanism of true ternary fission

New Horizons in Fundamental Physics

Dynamics of collinear ternary fission in the fragmentation of252Cf

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Dynamics of collinear ternary fission in the fragmentation of²⁵²Cf