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A decay study of 70As.

Yan Li1, Shuifa Shen, Shuanghui Shi

  • 1Shanghai Institute of Nuclear Research, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|August 31, 2002
PubMed
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Researchers investigated excited states in the 70Ge nucleus via 70As radioactive decay. New gamma transitions and energy levels were identified, refining the nuclear decay scheme and suggesting spin-parity assignments for 70Ge.

Area of Science:

  • Nuclear Physics
  • Radioactive Decay Studies
  • Nuclear Structure

Background:

  • Understanding nuclear structure is crucial for nuclear physics.
  • Investigating excited states provides insights into nuclear properties.

Purpose of the Study:

  • To investigate the excited states of the 70Ge nucleus.
  • To establish a detailed nuclear decay scheme for 70As.
  • To suggest spin-parity assignments for excited states in 70Ge.

Main Methods:

  • Radioactive decay analysis of 70As.
  • Detection and analysis of gamma-ray transitions.
  • Construction of the 70Ge level scheme.
  • Evaluation of log ft values and gamma-branching ratios.

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Main Results:

  • Four new gamma transitions (1036.99, 1196.66, 1539.29, 2531.7 keV) were identified.
  • The placement of the 2219.34 keV transition was reassigned.
  • Three gamma-rays (496.74, 1295.24, 1417.24 keV) were newly placed in the decay scheme.
  • Two new levels at 4243.10 and 5265.81 keV were proposed.
  • The placements of three gamma-rays were confirmed.

Conclusions:

  • A comprehensive level scheme for 70Ge was established.
  • Spin-parity assignments were suggested for several levels based on decay properties.
  • This study enhances the understanding of nuclear structure in 70Ge.