Competition between mass-symmetric and asymmetric fission modes in 258Md produced in the 4He+254Es reaction

Nishio, K.; Hirose, K.; Makii, H.; Orlandi, R.; Kean, K. R.; Tsukada, K.; Toyoshima, A.; Asai, M.; Sato, T. K.; Chiera, N. M.; Tomitsuka, T.; Tokoi, K.; Yanagihara, R.; Suzuki, H.; Nagame, Y.; Okada, K.; Andreyev, A. N.; Tanaka, T.; Morimoto, K.; Ishizaki, S.; Okubayashi, M.; Miyamoto, Y.; Tanaka, S.; Takagi, S.; Aritomo, Y.; Kubono, S.; Iwasa, N.; Egeta, M.; Sakaguchi, S.; Matsunaga, S.; Ishibashi, Y.; Rykaczewski, K. P.; Boll, R. A.; Ezold, J. G.; Felker, L. K.; Roberto, J. B.

doi:10.1103/PhysRevC.111.044609

Title: Competition between mass-symmetric and asymmetric fission modes in ²⁵⁸Md produced in the ⁴He+²⁵⁴Es reaction

Journal Article · Mon Apr 21 00:00:00 UTC 2025 · Physical Review. C

DOI: https://doi.org/10.1103/PhysRevC.111.044609 · OSTI ID:2573568

^[1]; Hirose, K. ^[1];

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^[1]; Kean, K. R. ^[2]; Tsukada, K. ^[1]; Toyoshima, A. ^[1]; Asai, M. ^[1]; Sato, T. K. ^[1]; Chiera, N. M. ^[1]; Tomitsuka, T. ^[3]; Tokoi, K. ^[4]; Yanagihara, R. ^[5]; Suzuki, H. ^[4]; Nagame, Y. ^[1]; Okada, K. ^[1];

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Japan Atomic Energy Agency (JAEA), Tokai (Japan). Advanced Science Research Center
Japan Atomic Energy Agency (JAEA), Tokai (Japan). Advanced Science Research Center; Tokyo Institute of Technology (Japan)
Japan Atomic Energy Agency (JAEA), Tokai (Japan). Advanced Science Research Center; Niigata University (Japan)
Japan Atomic Energy Agency (JAEA), Tokai (Japan). Advanced Science Research Center; Ibaraki University (Japan)
Japan Atomic Energy Agency (JAEA), Tokai (Japan). Advanced Science Research Center; Osaka Univ. (Japan)
Japan Atomic Energy Agency (JAEA), Tokai (Japan). Advanced Science Research Center; University of York (United Kingdom)
RIKEN Nishina Center, Saitama (Japan); Kyushu University, Fukuoka (Japan)
RIKEN Nishina Center, Saitama (Japan)
Kindai University, Osaka (Japan)
Tohoku University, Sendai (Japan)
Kyushu University, Fukuoka (Japan)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Earlier studies of spontaneous fission of heavy actinides found that the fission-fragment mass distribution suddenly changes from predominantly asymmetric to symmetric, when the mass number of the fissioning nucleus becomes larger than A_c = 257. We have measured for the first time fission-fragment mass and totalkinetic-energy (TKE) distributions of the excited compound nucleus ²⁵⁸Md∗ (Z = 101), populated in the reaction ⁴He + ²⁵⁴Es, using the rare radioactive target isotope²⁵⁴Es with a short half-life, T1/2 = 275.7 d. The fission of ²⁵⁸Md∗ can be interpreted as involving three fission modes: one mass-asymmetric and two mass-symmetric fission modes, the latter two are manifested by different TKE values. In this assumption, symmetric and asymmetric fission modes have nearly similar yields at the excitation energy of 15.0 MeV. The spectrum of 18.0 MeV can be explained as due to the increase of asymmetric fission mode.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: Japan Atomic Energy Agency; USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2573568

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 4 Vol. 111; ISSN 2469-9985; ISSN 2469-9993

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Competition between mass-symmetric and asymmetric fission modes in 258Md produced in the 4He+254Es reaction

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References (38)

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Title: Competition between mass-symmetric and asymmetric fission modes in ²⁵⁸Md produced in the ⁴He+²⁵⁴Es reaction