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SUMMARY:Analysis of ^{nat}Ce(n\,f)
DTSTART;VALUE=DATE-TIME:20251119T151500Z
DTEND;VALUE=DATE-TIME:20251119T153000Z
DTSTAMP;VALUE=DATE-TIME:20260421T143804Z
UID:indico-contribution-29003@indico.ific.uv.es
DESCRIPTION:Speakers: Nicolás Sánchez Vázquez (IGFAE-USC)\nNicolás Sá
 nchez Vázquez for the n_{TOF} collaboration. \n\nNuclear fission is a com
 plex process characterized by the splitting of a nucleus into two fragment
 s of comparable mass. The mass and charge distributions of the resulting f
 ission fragments are governed by the interplay between macroscopic nuclear
  properties and microscopic shell effects under extreme deformation. This 
 competition manifests in the asymmetric mass distributions observed in act
 inide fission and\, more recently\, in the sub-lead region [1]. Previous s
 tudies of high-energy fission in systems around Z=60 have suggested possib
 le asymmetric distributions [2]\, though limited statistics have prevented
  definitive conclusions. Current understanding indicates that favored defo
 rmed shells—specifically Z=52\, 56 for heavy fragments in actinides [3] 
 and Z=34 for light fragments in sub-lead systems [4\,5]—serve as primary
  drivers of these asymmetries . These findings motivate further investigat
 ion into the role of nuclear structure in lighter fissioning systems.\n\nI
 n 2024\, an experiment was conducted at the n_TOF/EAR1 facility to determi
 ne the symmetric or asymmetric character of fission yields in ^{nat}Ce(n\,
 f) reactions. The experimental setup employed ten tilted Parallel Plate Av
 alanche Counters (PPACs) to maximize angular coverage [6]. The configurati
 on included seven ^{nat}Ce targets\, along with ^{197}Au and ^{238}U targe
 ts as references\, each positioned between two PPACs. This arrangement ena
 bles comprehensive measurements of the reaction cross-section\, along with
  angular and mass distributions of the fission fragments.\n\nThis presenta
 tion will provide an overview of the current analysis status and present p
 reliminary results from the experiment.\n\n[1] A. N. Andreyev et al.\, Phy
 s. Rev. Lett. 105\, 252502 (2010).\n[2] H. A. Gustafsson et al.\, Phys. Re
 v. C 24\, 769 (1981).\n[3] G. Scamps and C. Simenel\, Nature 564\, 382 (20
 18).\n[4] G. Scamps and C. Simenel\, Phys. Rev. C 100\, 041602(R) (2019).\
 n[5] Morfouace\, P.\, Taieb\, J.\, Chatillon\, A. et al. An asymmetric fis
 sion island driven by shell effects in light fragments. Nature 641\, 339
 –344 (2025). https://doi.org/10.1038/s41586-025-08882-7\n[6] D. Tarrío 
 et al.\, Nucl. Instr. Methods A 743\, 79 (2014).\n\nhttps://indico.ific.uv
 .es/event/8035/contributions/29003/
LOCATION:
URL:https://indico.ific.uv.es/event/8035/contributions/29003/
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