Science in China Series A: Mathematics

, Volume 45, Issue 10, pp 1329–1334 | Cite as

Determination for β -delayed fission probability of230Ac

  • Yuan Shuanggui
  • Yang Weifan
  • Xu Yanbing
  • Xiao Yonghou
  • Luo Yixiao


The230Ra has been produced via232Th-2p reaction induced by 60 MeV/u18O ion irradiation of natural thorium. The radium was radiochemically separated from the mixture of thorium and reaction products. Thin Ra sources in which230Ac was got through\(^{230} Ra\xrightarrow{{\beta ^ - }}^{230} \)Ac were prepared for observing fission fragments from β-delayed fission of230Ac. The sources were exposed to the mica fission track detectors and measured by the HPGe γ detector. The precursor230Ac was identified by means of observed two fission events as well as γ spectra, and the β-delayed fission probability of230Ac was obtained to be (1.19 ± 0.85) × 10-8.


β -delayed fission probability multinucleon transfer reaction radiochemical separation 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Berlovich, E. Y., Novikov, Y. N., Delayed nuclear fission, Phys. Lett., 1969, B29: 155–156.Google Scholar
  2. 2.
    Klapdor, H. V., Oda, T., Metzinger, J., The beta strength function and the astrophysical side of the r-process, Z. Phys., 1981, A299: 213–229.Google Scholar
  3. 3.
    Thielemann, F. -K., Metzinger, J., Klapdor, H. V., Beta delayed fission and neutron emission: consequences for the astrophysical r-process and the age of the galaxy, Z. Phys., 1983, A309: 301–317.Google Scholar
  4. 4.
    Klapdor, H. V., Beta decay far from stability and its role in nuclear physics and astrophysics, Fortschr. Phys., 1985, 33: 1–55.CrossRefGoogle Scholar
  5. 5.
    Mezilev, K. A., Novikov, Y. N., Popov, A. V. et al., Search for delayed fission in neutron-rich nuclei, Z. Phys., 1990, A337: 109–109.Google Scholar
  6. 6.
    Gangrskii, Y. P., Marinescu, G. M., Miller, M. B. et al., Delayed fission of neutron-rich protactinium isotopes, Sov. J. Nucl. Phys., 1978, 27: 475–478.Google Scholar
  7. 7.
    Bass-May, A., Kratz, J. V., Trautmann, N., Absence of delayed fission in the β- decay of 2.3 min238Pa, Z. Phys., 1985, A322: 457–462.Google Scholar
  8. 8.
    Hall, H. L., Gregorich, K. E., Henderson, R. A. et al., β-delayed fission from256Esm and the level scheme of256Fm, Phys. Rev., 1989, C39: 1866–1875.Google Scholar
  9. 9.
    Akovali, Y. A., Nuclear data sheets for A = 230, Nucl. Data Sheets, 1993, 69: 155–208.CrossRefGoogle Scholar
  10. 10.
    Gippert, K. -L., Runte, E., Schmidt-Ott, W. -D. et al., Decay studies of neutron-rich radium and actinium isotopes including the new nuclides232Ra and232.234Ac, Nucl. Phys., 1986, A453: 1–14.Google Scholar
  11. 11.
    Rykaczewski, K., Gippert, K. -L., Kaffrell, N. et al., Investigation of neutron-rich rare-earth nuclei including the new isotopes177Tm and184Lu, Nucl. Phys., 1989, A499: 529–545.Google Scholar
  12. 12.
    Runte, E., Schmidt. W. -D., Eschner, W. et al., The decay of the new isotope180Yb and the search for the r-process path to180mTa,Z. Phys., 1987, A328: 119–122.Google Scholar
  13. 13.
    Rykaczewski, K., Kirchner, R., Kurcewing, W. et al., The new neutron-rich isotope183Lu, Z. Phys., 1983, A309: 273–274.Google Scholar
  14. 14.
    Zhang Li, Zhao Jihua, Zheng Jiwen et al., Neutron-rich heavy residues and exotic multinucleon transfer, Phys. Rev., 1998, C58: 156–163.Google Scholar
  15. 15.
    He Jianjun, Yang Weifan, Yuan Shuanggui et al., Synthesis and identification of a new heavy neutron-rich isotope238Th, Phys. Rev., 1999, C59: 520–521.Google Scholar
  16. 16.
    Fang Keming, Yang Weifan, Yuan Shuanggui et al., Decay of229Ra, Journal of Nuclear and Radiochemistry (in Chinese), 1997, 19: 42–46.Google Scholar
  17. 17.
    Gilat, J., Katcoff, S., Decay of230Ra and230Ac, J. Inorg. Nucl. Chem., 1978, 40: 369–375.CrossRefGoogle Scholar

Copyright information

© Science in China Press 2002

Authors and Affiliations

  • Yuan Shuanggui
    • 1
  • Yang Weifan
    • 1
  • Xu Yanbing
    • 1
  • Xiao Yonghou
    • 1
  • Luo Yixiao
    • 1
  1. 1.Institute of Modern PhysicsChinese Academy of SciencesLanzhouChina

Personalised recommendations