No influence of a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mn>126</mml:mn></mml:mrow></mml:math>neutron-shell closure in fission-fragment mass distributions

Chaudhuri, A. K.; Ghosh, T. K.; Banerjee, K.; Bhattacharya, Subhashish; Sadhukhan, Jhilam; Kundu, S.; Bhattacharya, C.; Meena, Jitendra Kumar; Mukherjee, G.; Saha, A.; Asgar, M.-D. A.; Dey, A.; Manna, S.; Pandey, R.; Rana, T. K.; Roy, Pratap; Roy, Tufan; Srivastava, V.; Bhattacharya, Purba; Biswas, D. C.; Joshi, B. N.; Mahata, K.; Shrivastava, A.; Vind, R. P.; Pal, Santanu; Behera, B. R.; Singh, Varinderjit

doi:10.1103/physrevc.92.041601

Cited by 11 publications

(9 citation statements)

References 29 publications

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“…On the other hand, for any change in the reaction mechanism (onset of quasi-fission and/or shell effect), there is abrupt change in the value of σ m [17]. In figure 5, we have plotted the variation of the width of fragment mass distribution with excitation energy for 210 Po populated using two different entrance channels: the present measurement ( 4 He + 206 Pb) and our earlier measurement ( 12 C + 198 Pt) [12]. In the same graph, we have also plotted the fission fragment widths for 213 At, populated through the reaction 4 He + 209 Bi for comparison.…”

Section: Resultsmentioning

confidence: 99%

“…Recent fission fragment mass distribution measurement by us [12] for the fissioning nuclei 206,210 Po to look for the signatures of shell correction at the saddle also produced null result. No significant deviation of mass distribution was found between 206 Po and 210 Po and both the distributions could be explained using realistic macroscopic potential only, indicating that there was no influence of N=126 shell closure on the mass distribution of 210 Po above 40 MeV of excitation energy, contrary to the reported angular anisotropy result.…”

Section: Introductionmentioning

confidence: 99%

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Fission fragment mass distributions from Po210 and At213

et al. 2017

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Background: The influence of shell effect on the dynamics of the fusion fission process and it's evolution with excitation energy in the pre-actinide Hg-Pb region in general is a matter of intense research in recent years. In particular, a strong ambiguity remains for the neutron shell closed 210 Po nucleus regarding the role of shell effect in fission around ≈ 30 -40 MeV of excitation energy.Purpose: We have measured the fission fragment mass distribution of 210 Po populated using fusion of 4 He + 206 Pb at different excitation energies and compare the result with recent theoretical predictions as well as with our previous measurement for the same nucleus populated through a different entrance channel. Mass distribution in the fission of the neighbouring nuclei 213 At is also studied for comparison.Methods: Two large area Multi-wire Proportional Counters (MWPC) were used for complete kinematical measurement of the coincident fission fragments. The time of flight differences of the coincident fission fragments were used to directly extract the fission fragment mass distributions.Results: The measured fragment mass distribution for the reactions 4 He + 206 Pb and 4 He + 209 Bi were symmetric and the width of the mass distributions were found to increase monotonically with excitation energy above 36.7 MeV and 32.9 MeV, respectively, indicating the absence of shell effects at the saddle. However, in the fission of 210 Po, we find minor deviation from symmetric mass distributions at the lowest excitation energy (30.8 MeV).Conclusion: Persistence of shell effect in fission fragment mass distribution of 210 Po was observed at the excitation energy ≈ 31 MeV as predicted by the theory; at higher excitation energy, however, the present study reaffirms the absence of any shell correction in the fission of 210 Po.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fission fragment mass distributions from Po210 and At213

et al. 2017

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“…Since currently it is not possible to produce the element with N=184 (as that would require highly neutron rich targets and projectiles which are not available in nature), 210 Po with magic number N=126 has been studied extensively to explore the survival of nuclear shell effects around the excitation energy around 40 MeV, beyond which one would expect the shell effects to vanish. Researchers of our Variable Energy Cyclotron Centre, Kolkata carried out several experiments recently [9,10] to explore the existence of shell effects at fission saddle at moderate excitation energy for 210 Po.…”

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confidence: 99%

“…The fission fragment mass distributions can be used as an experimental probe to look for the presence or absence of shell effects in nuclei [8]. Therefore mass distributions of the nuclei 210,206 Po were studied [9] by the researchers at Variable Energy Cyclotron Centre. The nuclei were populated by bombarding 12 [9] provides benchmark data to test the new fission dynamical models to study the effect of shell correction on the potential energy surface at fission saddle point.…”

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confidence: 99%

“…Therefore mass distributions of the nuclei 210,206 Po were studied [9] by the researchers at Variable Energy Cyclotron Centre. The nuclei were populated by bombarding 12 [9] provides benchmark data to test the new fission dynamical models to study the effect of shell correction on the potential energy surface at fission saddle point. Figure 2: Variation of the standard deviation of the fitted symmetric mass distribution with excitation energy.…”

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Into the Fission Valley of 'magic Nucleus' Polonium

Ghosh¹

2019

Current Science

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The word "radioactive" was first coined by Marie Curie when she, along with her husband Pierre Curie, discovered the element Polonium. The nucleus 210 Po is a testing ground for many theoretical and experimental aspects of nuclear structure as well as nuclear fission dynamics as it is a magic nucleus with neutron number N=126. At Variable Energy Cyclotron Centre, Kolkata the fission of Polonium nuclei is being studied in order to understand the survival of nuclear shell effects that is known to be the key for the stability of super heavy elements (SHE).

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Investigating the fission dynamics of the following neutron shell closed nuclei within a stochastic dynamical approach: ²¹⁰Po, ²¹²Rn, and ²¹³Fr*

Arora¹,

Sugathan²,

Chatterjee³

2023

Chinese Phys. C

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Dissipative dynamics of nuclear fission is a well confirmed phenomenon described either by a Kramers-modified statistical model or by a dynamical model employing the Langevin equation. Though dynamical models as well as statistical models incorporating fission delay are found to explain the measured fission observables in many studies, it nonetheless shows conflicting results for shell closed nuclei in the mass region 200. Analysis of recent data for neutron shell closed nuclei in excitation energy range 40−80 MeV failed to arrive at a satisfactory description of the data and attributed the mismatch to shell effects and/or entrance channel effects, without reaching a definite conclusion. In the present work we show that a well established stochastic dynamical code simultaneously reproduces the available data of pre-scission neutron multiplicities, fission and evaporation residue excitation functions for neutron shell closed nuclei 210Po and 212Rn and their isotopes 206Po and 214,216Rn without the need for including any extra shell or entrance channel effects. The calculations are performed by using a phenomenological universal friction form factor with no ad-hoc adjustment of model parameters. However, we note significant deviation, beyond experimental errors, in some cases of Fr isotopes.

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No influence of aN=126neutron-shell closure in fission-fragment mass distributions

Cited by 11 publications

References 29 publications

Fission fragment mass distributions from Po210 and At213

Fission fragment mass distributions from Po210 and At213

Into the Fission Valley of 'magic Nucleus' Polonium

Investigating the fission dynamics of the following neutron shell closed nuclei within a stochastic dynamical approach: ²¹⁰Po, ²¹²Rn, and ²¹³Fr*

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No influence of aN=126neutron-shell closure in fission-fragment mass distributions

Cited by 11 publications

References 29 publications

Fission fragment mass distributions from Po210 and At213

Fission fragment mass distributions from Po210 and At213

Into the Fission Valley of 'magic Nucleus' Polonium

Investigating the fission dynamics of the following neutron shell closed nuclei within a stochastic dynamical approach: 210Po, 212Rn, and 213Fr*

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Product

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Investigating the fission dynamics of the following neutron shell closed nuclei within a stochastic dynamical approach: ²¹⁰Po, ²¹²Rn, and ²¹³Fr*