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Direct determination of the La138β -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); Central Michigan University
  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)
+ Show Author Affiliations
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 $$\beta$$-decay $$Q$$ value with the beta-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 $$\beta$$-decay and electron capture (EC) $$Q$$ values to improve theoretical calculations of the $$\beta$$-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 beta-decay and EC Q values for 138La were obtained.Results: The 138La beta-decay and EC Q values were measured to be Q$$_\beta$$ = 1052.42(41) keV and $$Q_{EC}$$ = 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 $$\beta$$-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 $$\beta$$-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 $$\beta$$-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, Journal Name: Physical Review C Journal Issue: 1 Vol. 100; ISSN PRVCAN; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (1)

Investigation of the potential ultralow Q -value β -decay candidates Sr 89 and Ba 139 using Penning trap mass spectrometry journal August 2019

Figures / Tables (13)

FIG. 1(p. 2)figure FIG. 1
FIG. 2(p. 2)figure FIG. 2
FIG. 3(p. 3)figure FIG. 3
FIG. 4(p. 3)figure FIG. 4
FIG. 5(p. 4)figure FIG. 5
TABLE I(p. 4)table TABLE I
TABLE II(p. 4)table TABLE II
FIG. 6(p. 5)figure FIG. 6
FIG. 7(p. 6)figure FIG. 7
TABLE III(p. 6)table TABLE III
FIG. 8(p. 7)figure FIG. 8
TABLE IV(p. 7)table TABLE IV
TABLE V(p. 7)table TABLE V

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138La
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Penning trap
Q value
beta-decay