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beta-delayed fission of isomers in Bi-188

机译：BI-188中的异构体延迟次数

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摘要

beta-delayed fission (beta DF) decay of a low-spin (ls) and a high-spin (hs) isomer in Bi-188 was studied at the ISOLDE facility at CERN. Isomer-selective laser ionization and time gating were employed to investigate each isomer separately and their beta DF partial half-lives were determined: T-1/2p,T-beta DF(Bi-188(hs)) = 5.6(8) x 10(3) s and T-1/2p,T-beta DF(Bi-188(ls)) = 1.7(6) x 10(3) s. This work is the first beta DF study of two states in one isotope and allows the spin dependence of low-energy fission to be explored. The fission fragment mass distribution of a daughter nuclide Pb-188, following the beta decay of the high-spin isomer, was deduced and indicates a mixture of symmetric and asymmetric fission modes. Experimental results were compared with self-consistent mean-field calculations based on the finite-range Gogny D1M interaction. To reproduce the measured T-1/2p,T-beta DF(Bi-188(hs)), the calculated fission barrier of Pb-188 had to be reduced by approximate to 30%. After this reduction, the measured T-1/2p,T-beta DF(Bi-188(ls)) was in agreement with calculations for a few possible configurations for Bi-188(ls). Theoretical beta DF probabilities for these configurations were found to be lower by a factor of 4-9 than the beta DF probability of Bi-188(hs). The fission fragment mass distribution of Pb-188 was compared to the scission-point model SPY and the calculations based on the finite-range liquid-drop model. The first observation of beta DF for Bi-190 is also reported.
机译：在欧洲核子研究中心的ISOLDE设施中，研究了Bi-188中低自旋（ls）和高自旋（hs）异构体的β延迟裂变（βDF）衰变。采用异构体选择性激光电离和时间选通分别研究了每个异构体，并测定了它们的β-DF部分半衰期：T-1/2p，T-beta-DF（Bi-188（hs））=5.6（8）x 10（3）s和T-1/2p，T-beta-DF（Bi-188（ls））=1.7（6）x 10（3）s。这项工作是首次对一种同位素中两种状态的β-DF研究，并允许探索低能裂变的自旋依赖性。推导了高自旋异构体β衰变后，子核素Pb-188的裂变碎片质量分布，并指出了对称和非对称裂变模式的混合。实验结果与基于有限范围Gogny D1M相互作用的自洽平均场计算进行了比较。为了重现测得的T-1/2p、T-βDF（Bi-188（hs）），必须将Pb-188的计算裂变势垒降低约30%。在这一减少之后，测得的T-1/2p、T-beta DF（Bi-188（ls））与Bi-188（ls）的一些可能配置的计算结果一致。发现这些构型的理论β-DF概率比Bi-188（hs）的β-DF概率低4-9倍。将Pb-188的裂变碎片质量分布与破裂点模型SPY和基于有限范围液滴模型的计算进行了比较。还报告了Bi-190的首次β-DF观测。

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  • 来源
    《Physical review, C》 |2020年第1期|共12页
  • 作者

    Andel B.; Andreyev A. N.; Antalic S.; Al Monthery M.; Barzakh A.; Bissell M. L.; Chrysalidis K.; Cocolios T. E.; Cubiss J. G.; Goodacre T. Day; Dubray N.; Farooq-Smith G. J.; Fedorov D. V; Fedosseev V. N.; Gaffney L. P.; Ruiz R. F. Garcia; Goriely S.; Granados C.; Harding R. D.; Heinke R.; Hilaire S.; Huyse M.; Lemaitre J-F; Lynch K. M.; Marsh B. A.; Molkanov P.; Mosat P.; Peru S.; Raison C.; Rothe S.; Seiffert C.; Seliverstov M. D.; Sels S.; Studer D.; Sundberg J.; Van Duppen P.;

  • 作者单位

    Katholieke Univ Leuven Inst Kern Stralingsfys B-3001 Leuven Belgium;

    Univ York Dept Phys York YO10 5DD N Yorkshire England;

    Comenius Univ Dept Nucl Phys &

    Biophys Bratislava 84248 Slovakia;

    Univ York Dept Phys York YO10 5DD N Yorkshire England;

    NRC Kurchatov Inst Petersburg Nucl Phys Inst Gatchina 188300 Russia;

    Univ Manchester Sch Phys &

    Astron Manchester M13 9PL Lancs England;

    CERN CH-1211 Geneva 23 Switzerland;

    Katholieke Univ Leuven Inst Kern Stralingsfys B-3001 Leuven Belgium;

    Univ York Dept Phys York YO10 5DD N Yorkshire England;

    Univ Manchester Sch Phys &

    Astron Manchester M13 9PL Lancs England;

    CEA DAM DIF F-91297 Arpajon France;

    Katholieke Univ Leuven Inst Kern Stralingsfys B-3001 Leuven Belgium;

    NRC Kurchatov Inst Petersburg Nucl Phys Inst Gatchina 188300 Russia;

    CERN CH-1211 Geneva 23 Switzerland;

    Univ West Scotland Sch Engn &

    Comp Paisley PA1 2BE PA Scotland;

    Univ Manchester Sch Phys &

    Astron Manchester M13 9PL Lancs England;

    Univ Libre Bruxelles Inst Astron &

    Astrophys CP 226 B-1050 Brussels Belgium;

    Katholieke Univ Leuven Inst Kern Stralingsfys B-3001 Leuven Belgium;

    Univ York Dept Phys York YO10 5DD N Yorkshire England;

    Johannes Gutenberg Univ Mainz Inst Phys D-55128 Mainz Germany;

    CEA DAM DIF F-91297 Arpajon France;

    Katholieke Univ Leuven Inst Kern Stralingsfys B-3001 Leuven Belgium;

    Univ Libre Bruxelles Inst Astron &

    Astrophys CP 226 B-1050 Brussels Belgium;

    CERN CH-1211 Geneva 23 Switzerland;

    CERN CH-1211 Geneva 23 Switzerland;

    NRC Kurchatov Inst Petersburg Nucl Phys Inst Gatchina 188300 Russia;

    Comenius Univ Dept Nucl Phys &

    Biophys Bratislava 84248 Slovakia;

    CEA DAM DIF F-91297 Arpajon France;

    Univ York Dept Phys York YO10 5DD N Yorkshire England;

    CERN CH-1211 Geneva 23 Switzerland;

    CERN CH-1211 Geneva 23 Switzerland;

    NRC Kurchatov Inst Petersburg Nucl Phys Inst Gatchina 188300 Russia;

    Katholieke Univ Leuven Inst Kern Stralingsfys B-3001 Leuven Belgium;

    Johannes Gutenberg Univ Mainz Inst Phys D-55128 Mainz Germany;

    CERN CH-1211 Geneva 23 Switzerland;

    Katholieke Univ Leuven Inst Kern Stralingsfys B-3001 Leuven Belgium;

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  • 正文语种 eng
  • 中图分类 原子核物理学、高能物理学;
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