TY - JOUR
T1 - Observation of the competing fission modes in 178 Pt
AU - Tsekhanovich, I.
AU - Andreyev, A. N.
AU - Nishio, K.
AU - Denis-Petit, D.
AU - Hirose, K.
AU - Makii, H.
AU - Matheson, Z.
AU - Morimoto, K.
AU - Morita, K.
AU - Nazarewicz, W.
AU - Orlandi, R.
AU - Sadhukhan, J.
AU - Tanaka, T.
AU - Vermeulen, M.
AU - Warda, M.
N1 - Funding Information:
The authors express their gratitude to the JAEA tandem crew for the help in performing the 178 Pt experiment and to the GSI target group for making the 142 Nd target. This work was in part supported by the JAEA Reimei and STFC (UK) grants; by the U.S. Department of Energy under Awards No. DE-NA0002847 (NNSA, the Stewardship Science Academic Alliances Program) and No. DE-SC0018083 (Office of Science, Office of Nuclear Physics NUCLEI SciDAC-4 Collaboration); and by the Polish National Science Centre under Contract No. 2016/21/B/ST2/01227 .
PY - 2019/3/10
Y1 - 2019/3/10
N2 - Fragment mass distributions from fission of the excited compound nucleus 178 Pt have been deduced from the measured fragment velocities. The 178 Pt nucleus was created at the JAEA tandem facility in a complete fusion reaction 36 Ar + 142 Nd, 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, A L /A H ≈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.
AB - Fragment mass distributions from fission of the excited compound nucleus 178 Pt have been deduced from the measured fragment velocities. The 178 Pt nucleus was created at the JAEA tandem facility in a complete fusion reaction 36 Ar + 142 Nd, 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, A L /A H ≈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.
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U2 - 10.1016/j.physletb.2019.02.006
DO - 10.1016/j.physletb.2019.02.006
M3 - Article
AN - SCOPUS:85061368367
VL - 790
SP - 583
EP - 588
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
ER -