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Title: Direct determination of the La 138 β -decay Q value using Penning trap mass spectrometry

Journal Article · · Physical Review C
 [1];  [2];  [3];  [4];  [3];  [5];  [5];  [6];  [5];  [7];  [8];  [9];  [5]
  1. Central Michigan Univ., Mount Pleasant, MI (United States); National Superconducting Cyclotron Lab., East Lansing, MI (United States)
  2. National Superconducting Cyclotron Lab., East Lansing, MI (United States); Facility for Rare Isotope Beams, East Lansing, MI (United States); Michigan State Univ., East Lansing, MI (United States)
  3. Central Michigan Univ., Mount Pleasant, MI (United States)
  4. National Superconducting Cyclotron Lab., East Lansing, MI (United States); Univ. Greifswald, Greifswald (Germany)
  5. National Superconducting Cyclotron Lab., East Lansing, MI (United States); Michigan State Univ., East Lansing, MI (United States)
  6. Alternative Energies and Atomic Energy Commission (CEA), Gif-sur-Yvette Cedex (France). Lab.National Henri Becquerel
  7. Delft Univ. of Technology, Delft (Netherlands)
  8. National Superconducting Cyclotron Lab., East Lansing, MI (United States); Central Michigan Univ., Mount Pleasant, MI (United States)
  9. National Superconducting Cyclotron Lab., East Lansing, MI (United States)

Background: The understanding and description of forbidden decays provides interesting challenges for nuclear theory. These calculations could help to test underlying nuclear models and interpret experimental data. Purpose: Compare a direct measurement of the 138La β-decay Q value with the β-decay spectrum end-point energy measured by Quarati et al. using LaBr3 detectors [Appl. Radiat. Isot. 108, 30 (2016)]. Use new precise measurements of the 138La β-decay and electron capture (EC) Q values to improve theoretical calculations of the β-decay spectrum and EC probabilities. Method: High-precision Penning trap mass spectrometry was used to measure cyclotron frequency ratios of 138La, 138Ce, and 138Ba ions from which β-decay and EC Q values for 138La were obtained. Results: The 138La β-decay and EC Q values were measured to be Qβ = 1052.42(41) keV and QEC = 1748.41(34) keV, improving the precision compared to the values obtained in the most recent atomic mass evaluation [Wang et al., Chin. Phys. C 41, 030003 (2017)] by an order of magnitude. These results are used for improved calculations of the 138La β-decay shape factor and EC probabilities. New determinations for the 138Ce 2EC Q value and the atomic masses of 138La, 138Ce, and 138Ba are also reported. Conclusion: The 138La β-decay Q value measured by Quarati et al. is in excellent agreement with our new result, which is an order of magnitude more precise. Uncertainties in the shape factor calculations for 138La β decay using our new Q value are reduced by an order of magnitude. Uncertainties in the EC probability ratios are also reduced and show improved agreement with experimental data.

Research Organization:
Central Michigan Univ., Mount Pleasant, MI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Contributing Organization:
National Superconducting Cyclotron Laboratory
Grant/Contract Number:
SC0015927
OSTI ID:
1544566
Alternate ID(s):
OSTI ID: 1546434; OSTI ID: 1674964
Journal Information:
Physical Review C, Vol. 100, Issue 1; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 10 works
Citation information provided by
Web of Science

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Figures / Tables (13)