Angular momentum distribution for the formation of evaporation residues in fusion of 19F with 184W near the Coulomb barrier

Nath, S.; Gehlot, J.; Prasad, E.; Sadhukhan, Jhilam; Shidling, P. D.; Madhavan, N.; Muralithar, S.; Golda, K. S.; Jhingan, A.; Varughese, T.; Rao, P. V. Madhusudhana; Sinha, A. K.; Pal, Santanu

doi:10.1016/j.nuclphysa.2010.12.004

Cited by 10 publications

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“…Based on the systematic analysis, the authors concluded 'strongly' increased fissility above the shell closure at Z = 82. Nath et al measured σ ER [9] and ER-gated CN angular momentum (ℓ) distribution [10] for 19 F+ 184 W. The results were further compared with those from neighbourng systems with nearly similar entrance channel charge product, Z p Z t and mass asymmetry, η = |Ap−At| Ap+At (here Z p (Z t ) and A p (A t ) denote atomic number and mass number for the projectile (target), respectively). The fission barrier for the CN with Z = 82 was found to deviate from the systematic (N ,Z) dependence.…”

Section: Introductionmentioning

confidence: 99%

Search for stabilizing effects of the Z=82 shell closure against fission

et al. 2019

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Background: Presence of closed proton and/or neutron shells causes deviation from macrocopic properties of nuclei which are understood in terms of the liquid drop model. Efforts to synthesize artificial elements are driven by prediction of existence of closed shells beyond the heaviest doubly magic nucleus found in nature. It is important to investigate experimentally the stabilizing effects of shell closure, if any, against fission.Purpose: This work aims to investigate probable effects of proton shell (Z = 82) closure in the compound nucleus, in enhancing survival probability of the evaporation residues formed in heavy ion-induced fusion-fission reactions. Method: Evaporation residue cross sections have been measured for the reactions 19 F+ 180 Hf, 19 F+ 181 Ta and 19 F+ 182 W from ≃ 9% below to ≃ 42% above the Coulomb barrier; leading to formation of compound nuclei with same number of neutrons (N = 118) but different number of protons across Z = 82; employing the Heavy Ion Reaction Analyzer at IUAC. Measured excitation functions have been compared with statistical model calculation, in which reduced dissipation coefficient is the only adjustable parameter.Results: Evaporation residue cross section, normalized by capture cross section, is found to decrease gradually with increasing fissility of the compound nucleus. Measured evaporation residue cross sections require inclusion of nuclear viscosity in the model calculations. Reduced dissipation coefficient in the range of 1-3 × 10 21 s −1 reproduces the data quite well. Conclusions:Since entrance channel properties of the reactions and structural properties of the heavier reaction partners are very similar, degree of presence of non-compound nuclear fission, if any, is not expected to be significantly different in the three cases. No abrupt enhancement of evaporation residue cross sections has been observed in the reaction forming compound nucleus with Z = 82. Thus, this work does not find enhanced stabilizing effects of Z = 82 shell closure against fission in the compound nucleus. One may attempt to measure cross sections of individual exit channels for further confirmation of our observation.

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Section: Introductionmentioning

confidence: 99%

Search for stabilizing effects of the Z=82 shell closure against fission

et al. 2019

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“…We had earlier measured ER excitation function [13] and ER-gated CN angular momentum distribution [14] , where V Coul. is the Coulomb barrier.…”

Section: Introductionmentioning

confidence: 99%

Exploring the onset of quasiﬁssion by measurement of mass distribution in¹⁹F+¹⁸⁴W

Nath

Golda

Jhingan

et al. 2011

EPJ Web of Conferences

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Abstract. Fission fragment mass distributions for19 F+ 184 W have been measured at beam energies in the range of 85 -125 MeV. Analysis of mass distribution width indicates that the system proceeds towards the formation of compound nucleus. No signature of quasifission is observed in this reaction. These results strengthen the conclusions of our earlier works revealing the stabilizing effect of the Z = 82 shell closure against fission.

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Reconstruction of distribution from a finite number of its moments

Nath

2011

Nuclear Instruments and Methods in Physics Research Section A:

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Angular momentum distribution for the formation of evaporation residues in fusion of 19F with 184W near the Coulomb barrier

Cited by 10 publications

References 16 publications

Search for stabilizing effects of the Z=82 shell closure against fission

Search for stabilizing effects of the Z=82 shell closure against fission

Exploring the onset of quasiﬁssion by measurement of mass distribution in¹⁹F+¹⁸⁴W

Reconstruction of distribution from a finite number of its moments

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Angular momentum distribution for the formation of evaporation residues in fusion of 19F with 184W near the Coulomb barrier

Cited by 10 publications

References 16 publications

Search for stabilizing effects of the Z=82 shell closure against fission

Search for stabilizing effects of the Z=82 shell closure against fission

Exploring the onset of quasiﬁssion by measurement of mass distribution in19F+184W

Reconstruction of distribution from a finite number of its moments

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Product

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Exploring the onset of quasiﬁssion by measurement of mass distribution in¹⁹F+¹⁸⁴W