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Hg 178 and asymmetric fission of neutron-deficient pre-actinides

Jhingan, A. ; Schmitt, C. ; Lemasson, A. ; Biswas, S. ; Kim, Y. H. ; Ramos, D. ; Andreyev, A. N. ; Curien, D. ; Ciemała, M. and Clément, E. , et al. (2022) In Physical Review C 106(4).
Abstract

Fission at low excitation energy is an ideal playground to probe the impact of nuclear structure on nuclear dynamics. While the importance of structural effects in the nascent fragments is well established in the (trans-)actinide region, the observation of asymmetric fission in several neutron-deficient pre-actinides can be explained by various mechanisms. To deepen our insight into that puzzle, an innovative approach based on inverse kinematics and an enhanced version of the VAMOS++ heavy-ion spectrometer was implemented at the GANIL facility, Caen. Fission of Hg178 was induced by fusion of Xe124 and Fe54. The two fragments were detected in coincidence using VAMOS++ supplemented with a new SEcond Detection arm. For the first time in... (More)

Fission at low excitation energy is an ideal playground to probe the impact of nuclear structure on nuclear dynamics. While the importance of structural effects in the nascent fragments is well established in the (trans-)actinide region, the observation of asymmetric fission in several neutron-deficient pre-actinides can be explained by various mechanisms. To deepen our insight into that puzzle, an innovative approach based on inverse kinematics and an enhanced version of the VAMOS++ heavy-ion spectrometer was implemented at the GANIL facility, Caen. Fission of Hg178 was induced by fusion of Xe124 and Fe54. The two fragments were detected in coincidence using VAMOS++ supplemented with a new SEcond Detection arm. For the first time in the pre-actinide region, access to the pre-neutron mass and total kinetic energy distributions, and the simultaneous isotopic identification of one the fission fragment, was achieved. The present work describes the experimental approach, and discusses the pre-neutron observables in the context of an extended asymmetric-fission island located southwest of Pb208. A comparison with different models is performed, demonstrating the importance of this new asymmetric-fission island for elaborating on driving effects in fission.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review C
volume
106
issue
4
article number
044607
publisher
American Physical Society
external identifiers
  • scopus:85142489149
ISSN
2469-9985
DOI
10.1103/PhysRevC.106.044607
language
English
LU publication?
yes
id
e0ea8df2-594c-48bd-9d1a-c1d3da5d7278
date added to LUP
2022-12-29 12:13:11
date last changed
2022-12-29 12:13:11
@article{e0ea8df2-594c-48bd-9d1a-c1d3da5d7278,
  abstract     = {{<p>Fission at low excitation energy is an ideal playground to probe the impact of nuclear structure on nuclear dynamics. While the importance of structural effects in the nascent fragments is well established in the (trans-)actinide region, the observation of asymmetric fission in several neutron-deficient pre-actinides can be explained by various mechanisms. To deepen our insight into that puzzle, an innovative approach based on inverse kinematics and an enhanced version of the VAMOS++ heavy-ion spectrometer was implemented at the GANIL facility, Caen. Fission of Hg178 was induced by fusion of Xe124 and Fe54. The two fragments were detected in coincidence using VAMOS++ supplemented with a new SEcond Detection arm. For the first time in the pre-actinide region, access to the pre-neutron mass and total kinetic energy distributions, and the simultaneous isotopic identification of one the fission fragment, was achieved. The present work describes the experimental approach, and discusses the pre-neutron observables in the context of an extended asymmetric-fission island located southwest of Pb208. A comparison with different models is performed, demonstrating the importance of this new asymmetric-fission island for elaborating on driving effects in fission.</p>}},
  author       = {{Jhingan, A. and Schmitt, C. and Lemasson, A. and Biswas, S. and Kim, Y. H. and Ramos, D. and Andreyev, A. N. and Curien, D. and Ciemała, M. and Clément, E. and Dorvaux, O. and De Canditiis, B. and Didierjean, F. and Duchêne, G. and Dudouet, J. and Frankland, J. and Frémont, G. and Goupil, J. and Jacquot, B. and Raison, C. and Ralet, D. and Retailleau, B. M. and Stuttgé, L. and Tsekhanovich, I. and Andreev, A. V. and Goriely, S. and Hilaire, S. and Lemaître, J. F. and Möller, P. and Schmidt, K. H.}},
  issn         = {{2469-9985}},
  language     = {{eng}},
  number       = {{4}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review C}},
  title        = {{Hg 178 and asymmetric fission of neutron-deficient pre-actinides}},
  url          = {{http://dx.doi.org/10.1103/PhysRevC.106.044607}},
  doi          = {{10.1103/PhysRevC.106.044607}},
  volume       = {{106}},
  year         = {{2022}},
}