Fragment distributions in the fission of 232Th by protons of energies 13 to 53 MeV

Croall, I.F.; Cuninghame, J.G.

doi:10.1016/0375-9474(69)91082-3

Cited by 36 publications

(3 citation statements)

References 11 publications

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“…Also, the maximum available excitation energy for the fissioning system is restricted by the Qvalue of the parent nucleus [4]. In the actinide region, it is observed that [1,5] the fragment mass division becomes symmetric with increasing excitation energy, as shell effects generally wash out at higher excitations. In order to understand the evolution of fission fragment mass distribution as a function of neutron and proton numbers (N and Z) of the fissioning system and the excitation energy in the neutron deficient Hg region, we measured the fission fragment mass distributions of 182 Hg populated through the fusion reaction 40 Ca+ 142 Nd at energies around the capture barrier.…”

Section: Introductionmentioning

confidence: 99%

Mass-asymmetric fission in the⁴⁰ca+¹⁴²Nd reaction

et al. 2016

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Abstract. Shell effects play a major role in fission. Mass-asymmetric fission observed in the spontaneous and low energy fission of actinide nuclei was explained by incorporating the fragment shell properties in liquid drop model. Asymmetric fission has also been observed in the low energy fission of neutron-deficient 180 Hg nuclei in recent β-delayed fission experiments. This low-energy β-delayed fission has been explained in terms of strong shell effects in pre-scission configurations associated with the system after capture. Calculations predicted asymmetric fission for heavier Hg isotopes as well, at compound nuclear excitation energy as high as 40 MeV. To explore the evolution of fission fragment mass distribution as a function of neutron and proton numbers and also with excitation energy, fission fragment mass distributions have been measured for the 40 Ca+ 142 Nd reaction forming the compound nucleus 182 Hg at energies around the capture barrier, using the Heavy Ion Accelerator Facility and CUBE spectrometer at the Australian National University. Mass-asymmetric fission is observed in this reaction at an excitation energy of 33.6 MeV. The results are consistent with the β-delayed fission measurements and indicate the presence of shell effects even at higher exciation energies.

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Section: Introductionmentioning

confidence: 99%

Mass-asymmetric fission in the⁴⁰ca+¹⁴²Nd reaction

et al. 2016

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“…[Experimental data of mass-yield curves of fission fragments obtained from the following reactions (column by column and from top to bottom) : A) [16]. E) 239Pu + d, 9.2, 12.3, 16.1, 17.9, 23.4 MeV [7].…”

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confidence: 99%

“…Reste la zone de transition D ou la symetrie n'apparait qu'au-dela du seuil. Cette zone est facilement identifiable sur differentes donnees ou le Th [15,17] et le Pa [15,16] sont formés en tant que noyau compose. Sur la colonne D, figurent les resultats de la reaction )32Th + p Pa (13,20,35,45, 53 MeV) [16].…”

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