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Chinese Physics C> 1994, Vol. 18> Issue(8) : 680-686 

New Results of β-delayed α Decay of 20Na

  •  Institute of Modern Physics, Academia Sinica,Lanzhou 730000

  • The β-delayed α decay of 20Na was restudied using neon target bombarded by 25 and 35.5 MeV protons.In this experiment a newly developed particle-telescope system including a gas ionization chamber as a thin ΔE detector was used. Two new peaks,one at 0.695 MeV and other at 0.907 MeV, were observed for the first time in the charged particle spectra. Based on particle identification, branching ratio and life time measurement,it is believed that these new peaks result from β-delayed low energy αdecay of 20Na.The decay scheme and the low-lying level scheme of 20Na were thus revised.Its possible astrophysical implications were discussed.
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    [1] L.O.Lammetal,Z.Phys,A3Z7（1987）239.[2]S.Kubonoetal.z.Phys,A331（1988）359.[3]S.Kubono,N.IkedaandY.Funatsuetal.Phys.Rev,C46（1992）361.[4]徐晓冀、郭俊盛、胡志强等，高能物理与核物理，17,（1993）577.[5]胡志强、徐晓冀，粒子望远镜对运动放射源的绝对探测效率研究，原子能科学技术，待发表。[6]D.F.Torgerson,K.WienandY.Faresetal.Phys.Rev C8（1973）161[7]J.D.Pearson,E. Almqvistand J. A. Kuehner,Can J. Phys,42（1964）489.[8]L.O.Lammetal Nuclear Physics A510（1990）503.[9]C.MichaelLedererandViginia S.Shirley,Table of Isotopes,Seventh Edtion,P.32.[10]JGorres,M.WiescherandK.Schelleretal.Phys.Rev.C46（1992）R833.

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Xu Xiaoji, Hu Zhiqiang, Guo Junsheng, Ma Ruichang, Liu Hongye, Luo Yixiao, Zhang Yuzhao, Guo Tianrui, Huang Wenxue and Xu Lianlian. New Results of β-delayed α Decay of 20Na[J]. Chinese Physics C, 1994, 18(8): 680-686.
Xu Xiaoji, Hu Zhiqiang, Guo Junsheng, Ma Ruichang, Liu Hongye, Luo Yixiao, Zhang Yuzhao, Guo Tianrui, Huang Wenxue and Xu Lianlian. New Results of β-delayed α Decay of 20Na[J]. Chinese Physics C, 1994, 18(8): 680-686. shu
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Received: 1900-01-01
Revised: 1900-01-01
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New Results of β-delayed α Decay of 20Na

    Corresponding author: Xu Xiaoji,
  • Institute of Modern Physics, Academia Sinica,Lanzhou 730000
  • Received Date: 1900-01-01
  • Accepted Date: 1900-01-01
  • Available Online: 1994-08-05

Abstract: The β-delayed α decay of 20Na was restudied using neon target bombarded by 25 and 35.5 MeV protons.In this experiment a newly developed particle-telescope system including a gas ionization chamber as a thin ΔE detector was used. Two new peaks,one at 0.695 MeV and other at 0.907 MeV, were observed for the first time in the charged particle spectra. Based on particle identification, branching ratio and life time measurement,it is believed that these new peaks result from β-delayed low energy αdecay of 20Na.The decay scheme and the low-lying level scheme of 20Na were thus revised.Its possible astrophysical implications were discussed.

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