Impact of multichance fission on fragment-neutron correlations in <math><mmultiscripts><mi>Pa</mi><mprescripts/><none/><mn>227</mn></mmultiscripts></math> - Archive ouverte HAL
Article Dans Une Revue Phys.Rev.C Année : 2023

Impact of multichance fission on fragment-neutron correlations in Pa227

N Saneesh
  • Fonction : Auteur
Divya Arora
  • Fonction : Auteur
A Chatterjee
  • Fonction : Auteur
Anamika Parihari
  • Fonction : Auteur
Chandra Kumar
  • Fonction : Auteur
I Ahmed
  • Fonction : Auteur
S Kumar
  • Fonction : Auteur
Mohit Kumar
  • Fonction : Auteur
Akhil Jhingan
  • Fonction : Auteur
K.S Golda
  • Fonction : Auteur
A.M Vinodkumar
  • Fonction : Auteur
P Sugathan
  • Fonction : Auteur

Résumé

We investigate the influence of neutron emission in the fission of Pa227 populated by complete fusion of F19 with Pb208 at various excitation energies (E*). Mass gated pre-scission neutron multiplicities (νpre) were determined by fragment-neutron angular correlation and time of flight of fission fragments and neutrons using the National Array of Neutron Detectors facility. Obtained Massνpre correlation showed that, at lower E*=24.2 and 32.4 MeV, larger νpre is correlated with asymmetric mass division. On the other hand, at higher E*=46.1 and 59.6 MeV, larger νpre is correlated with symmetric mass division. The results were analyzed within the framework of the general description of fission observables GEneral description of Fission observables (GEF) model with multichance fission included. The analysis of fragment mass–total kinetic energy correlation for different chance fission clearly indicates a revival of shell effects at E*=24.2 and 32.4 MeV as a consequence of sequential fission decay. At these energies, higher chance fission decreases the saddle point excitation energy considerably where shell effects are prominent. The interplay of shell mediated mass asymmetric fission and symmetric fission gives rise to an energy dependent Massνpre correlation. We have compared the experimental results with Massνpre correlation predicted by the GEF model. It is concluded that the correlation of larger νpre with asymmetric mass at lower excitation energies is a signature of shell effects reinstated by sequential fission decay. At the two higher excitation energies, despite the multichance fission and consequent decrease in saddle point energy, the available excitation energy appears sufficient for the attenuation of shell effects.
Fichier non déposé

Dates et versions

hal-04204465 , version 1 (12-09-2023)

Identifiants

Citer

N Saneesh, Divya Arora, A Chatterjee, Neeraj Kumar, Anamika Parihari, et al.. Impact of multichance fission on fragment-neutron correlations in Pa227. Phys.Rev.C, 2023, 108 (3), pp.034609. ⟨10.1103/PhysRevC.108.034609⟩. ⟨hal-04204465⟩
9 Consultations
0 Téléchargements

Altmetric

Partager

More