Observation of the competing fission modes in 178Pt
Abstract
Fragment mass distributions from fission of the excited compound nucleus 178Pt have been deduced from the calculated 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 justifies the first observation of a multimodal fission in the sub-lead region. Most probable experimental fragment-mass split of the asymmetric mode, $$\mathcal{A_{L}/A_{H}}$$ ≈ 79/99, is well reproduced by nuclear density functional theory using the UNEDF1-HFB and D1S density functionals. The symmetric mode is associated by theory with very elongated fission fragments, which is consistent with the observed total kinetic energy/fragment mass correlation.
- Authors:
- Publication Date:
- Research Org.:
- Michigan State Univ., East Lansing, MI (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1547759
- Alternate Identifier(s):
- OSTI ID: 1513814
- Grant/Contract Number:
- NA0002847; SC0018083; NA0003885
- Resource Type:
- Published Article
- Journal Name:
- Physics Letters B
- Additional Journal Information:
- Journal Name: Physics Letters B Journal Volume: 790 Journal Issue: C; Journal ID: ISSN 0370-2693
- Publisher:
- Elsevier
- Country of Publication:
- Netherlands
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 178PtFusion–fission; Symmetric and asymmetric fission modes
Citation Formats
Tsekhanovich, I., Andreyev, A. N., Nishio, K., Denis-Petit, D., Hirose, K., Makii, H., Matheson, Z., Morimoto, K., Morita, K., Nazarewicz, W., Orlandi, R., Sadhukhan, J., Tanaka, T., Vermeulen, M., and Warda, M. Observation of the competing fission modes in 178Pt. Netherlands: N. p., 2019.
Web. doi:10.1016/j.physletb.2019.02.006.
Tsekhanovich, I., Andreyev, A. N., Nishio, K., Denis-Petit, D., Hirose, K., Makii, H., Matheson, Z., Morimoto, K., Morita, K., Nazarewicz, W., Orlandi, R., Sadhukhan, J., Tanaka, T., Vermeulen, M., & Warda, M. Observation of the competing fission modes in 178Pt. Netherlands. https://doi.org/10.1016/j.physletb.2019.02.006
Tsekhanovich, I., Andreyev, A. N., Nishio, K., Denis-Petit, D., Hirose, K., Makii, H., Matheson, Z., Morimoto, K., Morita, K., Nazarewicz, W., Orlandi, R., Sadhukhan, J., Tanaka, T., Vermeulen, M., and Warda, M. Fri .
"Observation of the competing fission modes in 178Pt". Netherlands. https://doi.org/10.1016/j.physletb.2019.02.006.
@article{osti_1547759,
title = {Observation of the competing fission modes in 178Pt},
author = {Tsekhanovich, I. and Andreyev, A. N. and Nishio, K. and Denis-Petit, D. and Hirose, K. and Makii, H. and Matheson, Z. and Morimoto, K. and Morita, K. and Nazarewicz, W. and Orlandi, R. and Sadhukhan, J. and Tanaka, T. and Vermeulen, M. and Warda, M.},
abstractNote = {Fragment mass distributions from fission of the excited compound nucleus 178Pt have been deduced from the calculated 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 justifies the first observation of a multimodal fission in the sub-lead region. Most probable experimental fragment-mass split of the asymmetric mode, $\mathcal{A_{L}/A_{H}}$ ≈ 79/99, is well reproduced by nuclear density functional theory using the UNEDF1-HFB and D1S density functionals. The symmetric mode is associated by theory with very elongated fission fragments, which is consistent with the observed total kinetic energy/fragment mass correlation.},
doi = {10.1016/j.physletb.2019.02.006},
journal = {Physics Letters B},
number = C,
volume = 790,
place = {Netherlands},
year = {Fri Mar 01 00:00:00 EST 2019},
month = {Fri Mar 01 00:00:00 EST 2019}
}
https://doi.org/10.1016/j.physletb.2019.02.006
Search WorldCat to find libraries that may hold this journalWeb of Science
Figures / Tables:
Figure 1: (a) Two-dimensional TOF1-TOF2 raw-data spectrum for coincident events at $E$beam = 170 MeV. Events in the black contour are from fission; remaining events are from the projectile-target scattering. (b) Summed energy signals from the MWPC detectors for $E$beam = 170 MeV plotted against the difference in their timingmore »
Works referencing / citing this record:
Asymmetric fission around lead: The case of
journal, December 2019
- Gupta, Shilpi; Schmitt, C.; Mahata, K.
- Physical Review C, Vol. 100, Issue 6
Figures / Tables found in this record: