Effect of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>α</mml:mi></mml:math>-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Q</mml:mi></mml:math>value on incomplete fusion

Yadav, Abhishek; Sharma, Vijay R.; Singh, Pushpendra P.; Kumar, R.; Singh, Devendra P.; Unnati,; Sharma, Manoj K.; Singh, B. P.; Prasad, R.

doi:10.1103/physrevc.86.014603

Cited by 51 publications

(48 citation statements)

References 52 publications

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“…This observation has been validated with detailed theoretical model calculation using GEF code which predict the fraction of asymmetric fission considering shell effects at low excitation energies quite well [30]. From one of our earlier measurement at IUAC, we have already reported the mass distribution of reaction 12 C+ 238 U forming CN 250 Cf and compared with another reaction 18 O+ 232 Th at around barrier energies [31]. A detailed re-analysis of low energy data from 12 C+ 238 U showed flat-topped non single Gaussian mass distribution in the fission of CN 250 Cf clearly demonstrating the presence of asymmetric fission arising from shell effects of fragments.…”

Section: Shell Effects In Mass Distribution Ofsupporting

confidence: 59%

Fusion-fission studies on ¹⁹F+^206,208Pb and ¹¹B,¹⁹F+²³⁸U reactions around barrier energies at IUAC facility

et al. 2017

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Abstract. Fission process is strongly influenced by entrance channel dynamical variables. Among these, the nuclear charge product, mass asymmetry and deformation play important role in fission dynamics. Reaction characteristics are distinguished by investigating the properties of fission mass and angular distributions. Experiments using actinide targets are challenging due to many conflicting results making unambiguous identification of quasi-fission difficult. At IUAC accelerator facility many experiments have been performed to make a systematic study of fission mechanism and role of entrance channel parameters and deformation. Fragment mass distribution, angular distribution and neutron multiplicity measurements are performed to study reactions using spherical and deformed targets.

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Section: Shell Effects In Mass Distribution Ofsupporting

confidence: 59%

Fusion-fission studies on ¹⁹F+^206,208Pb and ¹¹B,¹⁹F+²³⁸U reactions around barrier energies at IUAC facility

et al. 2017

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“…Quasifission has been shown to reduce P CN below 1 in reaction systems of heavy ions on deformed targets with charge product Z 1 Z 2 < 1,000 [34][35][36][37][38]. Values of Z 1 Z 2 are given in Table I and are much greater than 1,000, so it is expected that quasifission will moderately hinder the fusion probabilities for these reactions.…”

Section: Model Calculationsmentioning

confidence: 99%

Hot fusion-evaporation cross sections ofSc45-induced reactions with lanthanide targets

et al. 2015

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Background: 45 Sc has rarely been studied as a projectile in fusion-evaporation reactions. The synthesis of new superheavy elements with Z > 118 will require projectiles with Z > 20, and 45 Sc could potentially be used for this purpose.Purpose: Cross sections were measured for the xn and pxn exit channels in the reactions of 45 Sc with lanthanide targets for comparison to previous measurements of 48 Ca reacting with similar targets. These data provide insight on the survival of spherical, shell-stabilized nuclei against fission, and could have implications for the discovery of new superheavy elements. Methods:Beams of 45 Sc 6+ were delivered from the K500 superconducting cyclotron at Texas A&M University with an energy of ≈5 MeV/nucleon. Products were purified using the Momentum Achromat Recoil Spectrometer, and excitation functions were measured for reactions of 160 Gd, 159 Tb, and 162 Dy at five or more energies each. Evaporation residues were identified by their characteristic α-decay energies. Experimental data were compared to a simple theoretical model to study each step in the fusion-evaporation process. 2.4 + − , and 1.8 ± 0.6 μb, respectively. Proton emission competes effectively with neutron emission from the excited compound nucleus in most cases. The α, αn, and α2n products were also observed in the 45 Sc + 162 Dy reaction.Conclusions: Excitation functions were reported for 45 Sc-induced reactions on lanthanide targets for the first time, and these cross sections are much smaller than for 48 Ca-induced reactions on the same targets. The relative neutron-deficiency of the compound nuclei leads to significantly increased fissility and large reductions in the survival probability. Little evidence for improved production cross sections due to shell-stabilization was observed. PACS number(s): 25.70.Gh, 25.70.Jj

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“…The analysis of ICF in α-particle emitting channels has been carried out using the data reduction method [4,5] with the theoretical model calculations, PACE and/or EMPIRE which do not include the contribution of ICF process. The enhancement in the measured cross section data over the theoretical evaluation may be regarded as ICF, defined as, say for…”

Section: Icf Analysismentioning

confidence: 99%

“…on the ICF process by the recoil range distribution technique/recoil-catcher activation technique [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Li7 -induced reaction on Monat : A study of complete versus incomplete fusion

2017

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Background: Several investigations on the complete-incomplete fusion (CF-ICF) dynamics of α-cluster well-bound nuclei has been contemplated above the Coulomb barrier (∼ 4-7 MeV/nucleon) in recent years. It is therefore expected to observe significant ICF over CF in the reactions induced by a weakly bound α-cluster nucleus at slightly above the barrier.Purpose: Study of the CF-ICF dynamics by measuring the populated residues in the weakly bound 7 Li+ nat Mo system at energies slightly above the Coulomb barrier to well above it.Method: In order to investigate CF-ICF in the loosely bound system, 7 Li beam was bombarded on the nat Mo foils, separated by the aluminium (Al) catcher foils alternatively, within ∼ 3-6.5MeV/nucleon. Evaporation residues produced in each foil were identified by the off-line γ-ray spectrometry. Measured cross section data of the residues were compared with the theoretical model calculations based on the equilibrium (EQ) and preequilibrium (PEQ) reaction mechanisms. Results:The experimental cross section of 101m,100,99m,97 Rh, 97,95 Ru, 99m,96,95,94,93m+g Tc and 93m Mo residues measured at various projectile energies were satisfactorily reproduced by the simplified coupled channel approach in comparison to single barrier penetration model calculation.Significant cross section enhancement in the α-emitting channels was observed compared to EQ and PEQ model calculations throughout observed energy region. The ICF process over CF was analyzed by comparing with EMPIRE. The increment of the incomplete fusion fraction was observed with increasing projectile energies. Conclusions:Theoretical model calculations reveal that compound reaction mechanism is the major contributor to the production of residues in 7 Li+ nat Mo reaction. Theoretical evaluations substantiate the contribution of ICF over the CF in α-emitting channels. EMPIRE estimations shed light on its predictive capability of cross sections of the residues from the heavy-ion induced reactions.

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Effect ofα-Qvalue on incomplete fusion

Cited by 51 publications

References 52 publications

Fusion-fission studies on ¹⁹F+^206,208Pb and ¹¹B,¹⁹F+²³⁸U reactions around barrier energies at IUAC facility

Fusion-fission studies on ¹⁹F+^206,208Pb and ¹¹B,¹⁹F+²³⁸U reactions around barrier energies at IUAC facility

Hot fusion-evaporation cross sections ofSc45-induced reactions with lanthanide targets

Li7 -induced reaction on Monat : A study of complete versus incomplete fusion

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Effect ofα-Qvalue on incomplete fusion

Cited by 51 publications

References 52 publications

Fusion-fission studies on 19F+206,208Pb and 11B,19F+238U reactions around barrier energies at IUAC facility

Fusion-fission studies on 19F+206,208Pb and 11B,19F+238U reactions around barrier energies at IUAC facility

Hot fusion-evaporation cross sections ofSc45-induced reactions with lanthanide targets

Li7 -induced reaction on Monat : A study of complete versus incomplete fusion

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Product

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Fusion-fission studies on ¹⁹F+^206,208Pb and ¹¹B,¹⁹F+²³⁸U reactions around barrier energies at IUAC facility

Fusion-fission studies on ¹⁹F+^206,208Pb and ¹¹B,¹⁹F+²³⁸U reactions around barrier energies at IUAC facility