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Andel, B.*; Andreyev, A. N.; Antalic, S.*; Barzakh, A.*; Bree, N.*; Cocolios, T. E.*; Comas, V. F.*; Diriken, J.*; Elseviers, J.*; Fedorov, D. V.*; et al.
Physical Review C, 96(5), p.054327_1 - 054327_11, 2017/12
被引用回数:3 パーセンタイル:29.23(Physics, Nuclear)A detailed -decay spectroscopy study of
Tl has been performed at ISOLDE (CERN). Z-selective ionization by the Resonance Ionization Laser Ion Source (RILIS) coupled to mass separation provided a high-purity beam of
Tl. Fine-structure
decays to excited levels in the daughter
Au were identified and an
-decay scheme of
Tl was constructed based on an analysis of
-
and
-
-
coincidences. Multipolarities of several
-ray transitions deexciting levels in
Au were determined. Based on the analysis of reduced
-decay widths, it was found that all
decays are hindered, which signifies a change of configuration between the parent and all daughter states.
Elseviers, J.*; Andreyev, A. N.*; Huyse, M.*; Van Duppen, P.*; Antalic, S.*; Barzakh, A.*; Bree, N.*; Cocolios, T. E.*; Comas, V. F.*; Diriken, J.*; et al.
Physical Review C, 88(4), p.044321_1 - 044321_13, 2013/10
被引用回数:38 パーセンタイル:89.51(Physics, Nuclear)The detailed analysis of the -delayed fission data of
Tl is presented. The experiment was performed by producing a pure beam of
Tl by means of highly selective resonance laser ionization followed by mass separation with the ISOLDE isotope separator. A surprising asymmetric mass distribution of fission fragments from
Hg, the daughter of
Tl
decays, was obtained. Here, the energy calibration of the silicon detectors, which is crucial for a proper determination of the fission fragments' energy and mass split, is presented and the total kinetic energy and its dependence on the mass split ratio is discussed. A more precise
-delayed fission probability of 3.2(2)
10
was deduced.
Andreyev, A. N.*; Elseviers, J.*; Huyse, M.*; Van Duppen, P.*; Antalic, S.*; Barzakh, A.*; Bree, N.*; Cocolios, T. E.*; Comas, V. F.*; Diriken, J.*; et al.
Physical Review Letters, 105(25), p.252502_1 - 252502_5, 2010/12
被引用回数:181 パーセンタイル:97.2(Physics, Multidisciplinary)A very exotic process of -delayed fission of
Tl is studied in detail by using resonant laser ionization with subsequent mass separation at ISOLDE (CERN). In contrast to common expectations, the fission-fragment mass distribution of the post-
-decay daughter nucleus
Hg (
/
= 1.25) is asymmetric. This asymmetry is more surprising since a mass-symmetric split of this extremely neutron-deficient nucleus would lead to two
Zr fragments, with magic
= 50 and semi-magic
= 40. This is a new type of asymmetric fission, not caused by large shell effects related to fragment magic proton and neutron numbers, as observed in the actinide region. The newly-measured branching ratio for
-delayed fission of
Tl is 3.6(7)
10
%.
西尾 勝久; Andreyev, A. N.*; Elseviers, J.*; Huyse, M.*; Van Duppen, P.*; Antalic, S.*; Barzakh, A.*; Bree, N.*; Cocolios, T. E.*; Comas, V. F.*; et al.
no journal, ,
陽子過剰な原子核Hgの低励起エネルギー核分裂を測定した。CERN-ISOLDEにおいて
Tlをアイソトープ分離し、このベータ崩壊によって娘核
Hgを励起さることで、この核分裂を観測した(ベータ崩壊遅延核分裂)。核分裂特性を調べたところ、中性子数50の閉殻を有する
Zr原子核は生成されず、質量数80と100に収率の最大を有する非対称な核分裂を示した。また、原子力機構タンデム加速器において、陽子過剰原子核のインビーム核分裂実験を行った。この結果、ウランなど従来の核分裂と異なり、励起エネルギーが増加しても質量非対称度が変化しないことがわかった。