Observation of the competing fission modes in 178Pt
Fragment mass distributions from fission of the excited compound nucleus 178Pt have been deduced from the measured fragment velocities. The 178Pt nucleus was created at the JAEA tandem facility in a complete fusion reaction 36Ar + 142Nd, at beam energies of 155, 170 and 180 MeV. The data are indicat...
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doaj-61943b59ddbb4b309ecf056ddd4aed452020-11-25T00:52:54ZengElsevierPhysics Letters B0370-26932019-03-01790583588Observation of the competing fission modes in 178PtI. Tsekhanovich0A.N. Andreyev1K. Nishio2D. Denis-Petit3K. Hirose4H. Makii5Z. Matheson6K. Morimoto7K. Morita8W. Nazarewicz9R. Orlandi10J. Sadhukhan11T. Tanaka12M. Vermeulen13M. Warda14CENBG, CNRS/IN2P3-Université de Bordeaux, 33170 Gradignan, France; Corresponding author.Department of Physics, University of York, York YO10 5DD, United Kingdom; Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195 Japan; ISOLDE, CERN, CH-1211 Geneve 23, SwitzerlandAdvanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195 JapanCENBG, CNRS/IN2P3-Université de Bordeaux, 33170 Gradignan, FranceAdvanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195 JapanAdvanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195 JapanDepartment of Physics and Astronomy and FRIB Laboratory, Michigan State University, East Lansing, MI 48824, USARIKEN Nishina Center for Accelerator-Based Science, Saitama 351-0198, JapanRIKEN Nishina Center for Accelerator-Based Science, Saitama 351-0198, Japan; Department of Physics, Kyushu University, Fukuoka 819-0395, JapanDepartment of Physics and Astronomy and FRIB Laboratory, Michigan State University, East Lansing, MI 48824, USAAdvanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195 JapanVariable Energy Cyclotron Centre, Kolkata 700064, India; Homi Bhabha National Institute, Mumbai 400094, IndiaRIKEN Nishina Center for Accelerator-Based Science, Saitama 351-0198, Japan; Department of Physics, Kyushu University, Fukuoka 819-0395, JapanAdvanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195 JapanInstitute of Physics, Maria Curie-Skłodowska University, 20-031 Lublin, PolandFragment mass distributions from fission of the excited compound nucleus 178Pt have been deduced from the measured fragment velocities. The 178Pt nucleus was created at the JAEA tandem facility in a complete fusion reaction 36Ar + 142Nd, at beam energies of 155, 170 and 180 MeV. The data are indicative of a mixture of the mass-asymmetric and mass-symmetric fission modes associated with higher and lower total kinetic energies of the fragments, respectively. The measured fragment yields are dominated by asymmetric mass splits, with the symmetric mode contributing at the level of ≈1/3. This constitutes the first observation of a multimodal fission in the sub-lead region. Most probable experimental fragment-mass split of the asymmetric mode, AL/AH≈79/99, is well reproduced by nuclear density functional theory using the UNEDF1-HFB and D1S potentials. The symmetric mode is associated by theory with very elongated fission fragments, which is consistent with the observed total kinetic energy/fragment mass correlation. Keywords: 178Pt, Fusion–fission, Symmetric and asymmetric fission modeshttp://www.sciencedirect.com/science/article/pii/S0370269319300978 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
I. Tsekhanovich A.N. Andreyev K. Nishio D. Denis-Petit K. Hirose H. Makii Z. Matheson K. Morimoto K. Morita W. Nazarewicz R. Orlandi J. Sadhukhan T. Tanaka M. Vermeulen M. Warda |
spellingShingle |
I. Tsekhanovich A.N. Andreyev K. Nishio D. Denis-Petit K. Hirose H. Makii Z. Matheson K. Morimoto K. Morita W. Nazarewicz R. Orlandi J. Sadhukhan T. Tanaka M. Vermeulen M. Warda Observation of the competing fission modes in 178Pt Physics Letters B |
author_facet |
I. Tsekhanovich A.N. Andreyev K. Nishio D. Denis-Petit K. Hirose H. Makii Z. Matheson K. Morimoto K. Morita W. Nazarewicz R. Orlandi J. Sadhukhan T. Tanaka M. Vermeulen M. Warda |
author_sort |
I. Tsekhanovich |
title |
Observation of the competing fission modes in 178Pt |
title_short |
Observation of the competing fission modes in 178Pt |
title_full |
Observation of the competing fission modes in 178Pt |
title_fullStr |
Observation of the competing fission modes in 178Pt |
title_full_unstemmed |
Observation of the competing fission modes in 178Pt |
title_sort |
observation of the competing fission modes in 178pt |
publisher |
Elsevier |
series |
Physics Letters B |
issn |
0370-2693 |
publishDate |
2019-03-01 |
description |
Fragment mass distributions from fission of the excited compound nucleus 178Pt have been deduced from the measured fragment velocities. The 178Pt nucleus was created at the JAEA tandem facility in a complete fusion reaction 36Ar + 142Nd, at beam energies of 155, 170 and 180 MeV. The data are indicative of a mixture of the mass-asymmetric and mass-symmetric fission modes associated with higher and lower total kinetic energies of the fragments, respectively. The measured fragment yields are dominated by asymmetric mass splits, with the symmetric mode contributing at the level of ≈1/3. This constitutes the first observation of a multimodal fission in the sub-lead region. Most probable experimental fragment-mass split of the asymmetric mode, AL/AH≈79/99, is well reproduced by nuclear density functional theory using the UNEDF1-HFB and D1S potentials. The symmetric mode is associated by theory with very elongated fission fragments, which is consistent with the observed total kinetic energy/fragment mass correlation. Keywords: 178Pt, Fusion–fission, Symmetric and asymmetric fission modes |
url |
http://www.sciencedirect.com/science/article/pii/S0370269319300978 |
work_keys_str_mv |
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