Peculiarities of Mean Kinetic Energy Dependence of Fragments at Nuclei Fission by Neutrons

Goverdovsky, A. A.; Kuz'minov, B.D.; Mitrofanov, V. F.; Sergachev, A. I.

doi:10.1007/978-94-009-4636-1_37

Cited by 4 publications

(12 citation statements)

References 2 publications

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“…The TKE was more than 1 MeV higher at 90 • compared to 0 • at E n = 0.77 MeV, which was also reported in Ref. [4]. The opposite trend seems to be present for the resonance at E n = 0.5 MeV.…”

Section: Average Changes In Mass and Tke Distributionssupporting

confidence: 86%

“…The kinetic energy release in 234 U(n,f ) was reported once before, in Ref. [4]. Instead of a higher TKE, a lower one was reported at the vibrational resonance as seen in Fig.…”

Section: Average Changes In Mass and Tke Distributionssupporting

confidence: 60%

“…The only earlier measurement from Ref. [4] showed a lower TKE. A possible explanation in terms of differences in the solid angle coverage is given in this work, since the TKE for E n = 0.77 MeV was found to be higher for larger angles in contrast to angles near 0 • .…”

Section: Discussionmentioning

confidence: 76%

“…Support for this idea can be found in Ref. [4] since the average fragment kinetic Table I); uncertainties in the y direction are statistical only.…”

Section: Average Changes In Mass and Tke Distributionsmentioning

confidence: 67%

“…It is estimated that more than 90% of the α pile-ups were removed [10]. Finally, to deduce the anode signal's amplitude a CR-RC 4 filter was applied based on a Butterworth-filter design [15]. The shaping time chosen for the filter was τ = 1.2 μs.…”

Section: A Signal Treatmentmentioning

confidence: 99%

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Fragment-mass, kinetic energy, and angular distributions forU234(n,f)at incident neutron energies fromEn
Al-Adili
¹
,
Hambsch
²
,
Pomp
³

et al. 2016
Phys. Rev. C
38
1
16
0
View full text Add to dashboard Cite

This work investigates the neutron-induced fission of 234 U and the fission-fragment properties for neutron energies between E n = 0.2 and 5.0 MeV with a special highlight on the prominent vibrational resonance at E n = 0.77 MeV. Angular, energy, and mass distributions were determined based on the double-energy technique by means of a twin Frisch-grid ionization chamber. The experimental data are parametrized in terms of fission modes based on the multimodal random neck-rupture model. The main results are a verified strong angular anisotropy and fluctuations in the energy release as a function of incident-neutron energy.

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Section: Average Changes In Mass and Tke Distributionssupporting

confidence: 86%

“…The kinetic energy release in 234 U(n,f ) was reported once before, in Ref. [4]. Instead of a higher TKE, a lower one was reported at the vibrational resonance as seen in Fig.…”

Section: Average Changes In Mass and Tke Distributionssupporting

confidence: 60%

Section: Discussionmentioning

confidence: 76%

“…Support for this idea can be found in Ref. [4] since the average fragment kinetic Table I); uncertainties in the y direction are statistical only.…”

Section: Average Changes In Mass and Tke Distributionsmentioning

confidence: 67%

Section: A Signal Treatmentmentioning

confidence: 99%

See 3 more Smart Citations

Fragment-mass, kinetic energy, and angular distributions forU234(n,f)at incident neutron energies fromEn
Al-Adili
¹
,
Hambsch
²
,
Pomp
³

et al. 2016
Phys. Rev. C
38
1
16
0
View full text Add to dashboard Cite

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^225-232Th symmetric/asymmetric neutron-induced fission up to 200 MeV

Maslov

2007

Nd2007

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Abstract. The transition from asymmetric to symmetric fission as a function of the excitation energy and the nucleon composition of fissioning Th nuclei is investigated for the 232 Th(n,f) reaction. Observed neutron-induced fission cross section is described in a fission/evaporation approximation. A separate relatively high outer fission barrier E S L f B with significant curvature was assumed for the symmetric (SL) mode, while the inner one (E S L(AS ) f A ) was assumed to be the same for symmetric and asymmetric (AS) modes. Axial asymmetry and mass symmetry is assumed for the outer saddle of the SL-mode, as distinct from the AS-mode. A drop of (E S L f A − E AS f A ) = 3.5 MeV to 1-1.5 MeV for Th nuclei with A ≤ 226 is responsible for the increase of the symmetric fission contribution to 225,229,230,231,232 Th(n,f) fission cross sections with neutron energy up to E n = 200 MeV. It is shown above 80 MeV the 229,230,231,232 Th(n,f) fission cross sections are no longer dependent on the Th target nuclide fissility.

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Peculiarities of cluster formation in true ternary fission of ²⁵²Cf and ²³⁶U^*

et al. 2014

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The existence of a new type of cluster decay called "collinear cluster tri-partition" (CCT) is discussed by an analysis of the landscape of the potential energy surface (PES). The total energy of the ternary system is found as a sum the binding energies of fragments and nucleus-nucleus interaction between them. The pre-scission state of the ternary system is assumed to be arranged as a chain of the three fragments along a straight line. Minima and valleys of the PES are determined by variation of the proton and neutron distributions between them. Pre-scission prompt emission of neutrons is assumed and PES is calculated for the cases of emission of 2-4 neutrons. The shows that the experimentally observed 68 Ni is formed as the edge fragment of the ternary system connecting to Sn by Si and Ca isotopes at fission of 236 U and 252 Cf, respectively.

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Peculiarities of Mean Kinetic Energy Dependence of Fragments at Nuclei Fission by Neutrons

Cited by 4 publications

References 2 publications

Fragment-mass, kinetic energy, and angular distributions forU234(n,f)at incident neutron energies fromEn
Al-Adili
¹
,
Hambsch
²
,
Pomp
³

et al. 2016
Phys. Rev. C
38
1
16
0
View full text Add to dashboard Cite

Fragment-mass, kinetic energy, and angular distributions forU234(n,f)at incident neutron energies fromEn
Al-Adili
¹
,
Hambsch
²
,
Pomp
³

et al. 2016
Phys. Rev. C
38
1
16
0
View full text Add to dashboard Cite

^225-232Th symmetric/asymmetric neutron-induced fission up to 200 MeV

Peculiarities of cluster formation in true ternary fission of ²⁵²Cf and ²³⁶U^*

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Peculiarities of Mean Kinetic Energy Dependence of Fragments at Nuclei Fission by Neutrons

Cited by 4 publications

References 2 publications

Fragment-mass, kinetic energy, and angular distributions forU234(n,f)at incident neutron energies fromEnAl-Adili1, Hambsch2, Pomp3 et al. 2016Phys. Rev. C381160View full textAdd to dashboardCite

Fragment-mass, kinetic energy, and angular distributions forU234(n,f)at incident neutron energies fromEnAl-Adili1, Hambsch2, Pomp3 et al. 2016Phys. Rev. C381160View full textAdd to dashboardCite

225-232Th symmetric/asymmetric neutron-induced fission up to 200 MeV

Peculiarities of cluster formation in true ternary fission of 252Cf and 236U*

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Fragment-mass, kinetic energy, and angular distributions forU234(n,f)at incident neutron energies fromEn
Al-Adili
¹
,
Hambsch
²
,
Pomp
³

et al. 2016
Phys. Rev. C
38
1
16
0
View full text Add to dashboard Cite

Fragment-mass, kinetic energy, and angular distributions forU234(n,f)at incident neutron energies fromEn
Al-Adili
¹
,
Hambsch
²
,
Pomp
³

et al. 2016
Phys. Rev. C
38
1
16
0
View full text Add to dashboard Cite

^225-232Th symmetric/asymmetric neutron-induced fission up to 200 MeV

Peculiarities of cluster formation in true ternary fission of ²⁵²Cf and ²³⁶U^*