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Title: 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:
 [1];  [2];  [3];  [1];  [3];  [3];  [4];  [5];  [6];  [4];  [3];  [7];  [6];  [3];  [8]
  1. CNRS/IN2P3-Université de Bordeaux, Gradignan (France)
  2. Univ. of York (United Kingdom); Japan Atomic Energy Agency (JAEA), Tokai (Japan); European Organization for Nuclear Research (CERN), Geneva (Switzerland)
  3. Japan Atomic Energy Agency (JAEA), Tokai (Japan)
  4. Michigan State Univ., East Lansing, MI (United States)
  5. RIKEN, Saitama (Japan)
  6. RIKEN, Saitama (Japan); Kyushu Univ. (Japan)
  7. Variable Energy Cyclotron Centre, Kolkata (India); Homi Bhabha National Inst., Mumbai (India)
  8. Maria Curie-Skłodowska Univ., Lublin (Poland)
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:  
NA0003885; NA0002847; SC0018083
Resource Type:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 790; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
United States
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. United States: 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. United States. 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., and Warda, M. Fri . "Observation of the competing fission modes in 178Pt". United States. doi: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. Section B},
number = C,
volume = 790,
place = {United States},
year = {2019},
month = {3}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1016/j.physletb.2019.02.006

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