Decay properties of new isotopes 235Bk and 231Am
The new isotopes, 235Bk and its α-decay daughter 231Am, were investigated using the gas-filled recoil separator SHANS2. They were identified by measuring radioactive decay chains originating from 235Bk, which was produced via the 197Au(40Ar, 2n)235Bk reaction. Three correlated α-decay chains were assigned to 235Bk, from which the α-particle energy of 235Bk was measured to be 7632(17) keV. For 231Am, the α-particle energy and half-life were determined to be 7109(18) keV and 75−30+137 s, respectively. The α-decay branching ratio of 231Am was evaluated as 17−15+65%. A systematic analysis reveals significant discrepancies between the experimental data and the WS4+RBF theoretical predictions for the isotopes of Bk and Am, which warrant further investigation.
Authors
- Z.C. Li
- V.K. Utyonkov
- J.Y. Wang
- A.V. POLYAKOV
- M.M. Zhang
- Lei Sun (ORCID: https://orcid.org/0000-0002-7410-7375)
- SG Zhou
- ZW Lu
- Yu. S. Tsyganov
- S.Y. Xu
- Z.G. Gan
- Y.H. Qiang
- J.H. Zheng
- Z.H. Li
- F. Guan
- X.L. Wu
- X.Y. Huang
- Y. He
- J.G. Wang
- H.B. Yang
- M.H. Huang
- Y.L. Tian
- C.L. Yang
- H. Zhou
- Z. -C. Zhao
- X. Zhang
- A.A. Voinov
- L. Ma
- Y.S. Wang
- L.T. Sun
- Z.Z. Ren
- A.N. Andreyev
- W.X. Huang
- Z.Y. Zhang
- G. Xie
- L. Z. Zhu
Publication Details
- Journal
- Physics Letters B
- Published
- 2026-03-17
- DOI
- https://doi.org/10.1016/j.physletb.2026.140365
- Primary Topic
- Nuclear physics research studies
- Type
- article
- Field-Weighted Citation Impact
- 0.00