A New Isotope of Z=105 with Mass Number 259

FAN Hong-Mei; GAN Zai-Guo; QIN Zhi; LEI Xiang-Guo; XU Yan-Bing; HE Jian-Jun; LIU Hong-Ye; WU Xiao-Lei; GUO Jun-Sheng; ZHOU Xiao-Hong; YUAN Shuang-Gui; JIN Gen-Ming

Chinese Physics C> 2001, Vol. 25> Issue(6) : 602-606

A New Isotope of Z=105 with Mass Number 259

Institute of Modern Physics, The Chinese Academy of Sciences, Lanzhou 730000, China

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Abstract：
An Isotope of element 105 with mass number 259 has been produced via the reaction ²⁴¹Am(²²Ne,4n)²⁵⁹Db at E_lab=120MeV. The reaction products were transported and collected using the helium-jet technique and rotating wheel apparatus. The α decays of the products and their daughter nuclides were detected by a series of Si(Au) detectors. The Z and A of the nuclide have been unambiguously identified by the genetic relationship between the new activity and the known nuclide ²⁵⁵Lr. The new nuclide ²⁵⁹Db has a half life of (0.51±0.16)s and decay by alpha particle emission with energy of 9.47MeV. The Q_α value for new isotope ²⁵⁹Db is in good coincidence with the predicted result.

References

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FAN Hong-Mei, GAN Zai-Guo, QIN Zhi, LEI Xiang-Guo, XU Yan-Bing, HE Jian-Jun, LIU Hong-Ye, WU Xiao-Lei, GUO Jun-Sheng, ZHOU Xiao-Hong, YUAN Shuang-Gui and JIN Gen-Ming. A New Isotope of Z=105 with Mass Number 259[J]. Chinese Physics C, 2001, 25(6): 602-606.

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Received: 2000-12-01
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

A New Isotope of Z=105 with Mass Number 259

Corresponding author: FAN Hong-Mei,

Institute of Modern Physics, The Chinese Academy of Sciences, Lanzhou 730000, China

Received Date: 2000-12-01
Accepted Date: 1900-01-01
Available Online: 2001-06-05

Abstract: An Isotope of element 105 with mass number 259 has been produced via the reaction ²⁴¹Am(²²Ne,4n)²⁵⁹Db at E_lab=120MeV. The reaction products were transported and collected using the helium-jet technique and rotating wheel apparatus. The α decays of the products and their daughter nuclides were detected by a series of Si(Au) detectors. The Z and A of the nuclide have been unambiguously identified by the genetic relationship between the new activity and the known nuclide ²⁵⁵Lr. The new nuclide ²⁵⁹Db has a half life of (0.51±0.16)s and decay by alpha particle emission with energy of 9.47MeV. The Q_α value for new isotope ²⁵⁹Db is in good coincidence with the predicted result.