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

Sandler, R.; Bollen, G.; Gamage, N. D.; Hamaker, A.; Izzo, C.; Puentes, D.; Redshaw, M.; Ringle, R.; Yandow, I.

doi:10.1103/physrevc.100.024309

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

Journal Article · 07 August 2019 · Physical Review C

DOI: https://doi.org/10.1103/physrevc.100.024309 · OSTI ID:1674965

^[1]; Bollen, G. ^[2]; Gamage, N. D. ^[3]; Hamaker, A. ^[4]; Izzo, C. ^[4]; Puentes, D. ^[4]; Redshaw, M. ^[1]; Ringle, R. ^[5]; Yandow, I. ^[4]

Central Michigan Univ., Mount Pleasant, MI (United States); 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)
Central Michigan Univ., Mount Pleasant, MI (United States)
National Superconducting Cyclotron Lab., East Lansing, MI (United States); Michigan State Univ., East Lansing, MI (United States)
National Superconducting Cyclotron Lab., East Lansing, MI (United States)

Background: Ultralow Q-value β decays are interesting processes to study with potential applications to nuclear β-decay theory and neutrino physics. While a number of potential ultralow Q-value β-decay candidates exist, improved mass measurements are necessary to determine which of these are energetically allowed. Purpose: To perform precise atomic mass measurements of ⁸⁹Y and ¹³⁹La. Use these new measurements along with the precisely known atomic masses of ⁸⁹Sr and ¹³⁹Ba and nuclear energy level data for ⁸⁹Y and ¹³⁹La to determine if there could be an ultralow Q-value decay branch in the β decay of ⁸⁹Sr → ⁸⁹Y or ¹³⁹Ba → ¹³⁹La. Method: High-precision Penning trap mass spectrometry was used to determine the atomic mass of ⁸⁹Y and ¹³⁹La, from which β-decay Q values for ⁸⁹Sr and ¹³⁹Ba were obtained. Results: The ⁸⁹Sr → ⁸⁹Y and ¹³⁹Ba → ¹³⁹La β-decay Q values were measured to be Q_Sr = 1502.20(0.35) keV and Q_Ba = 2308.37(0.68) keV. These results were compared to energies of excited states in ⁸⁹Y at 1507.4(0.1) keV, and in 139La at 2310(19) keV and 2313(1) keV to determine Q values of -5.20(0.37) keV for the potential ultralow β-decay branch of ⁸⁹Sr and -1.6(19.0) keV and -4.6(1.2) keV for those of ¹³⁹Ba. Conclusion: The potential ultralow Q-value decay branch of ⁸⁹Sr to the ⁸⁹Y (3/2^-, 1507.4 keV) state is energetically forbidden and has been ruled out. The potential ultralow Q-value decay branch of ¹³⁹Ba to the 2313 keV state in ¹³⁹La with unknown J^π has also been ruled out at the 4σ level, while more precise energy level data is needed for the ¹³⁹La (1/2⁺, 2310 keV) state to determine if an ultralow Q-value β-decay branch to this state is energetically allowed.

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Research Organization:: Central Michigan Univ., Mount Pleasant, MI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF)

Grant/Contract Number:: SC0015927; PHY-1102511; PHY-1307233

OSTI ID:: 1674965

Alternate ID(s):: OSTI ID: 1547978; OSTI ID: 1612348

Journal Information:: Physical Review C, Vol. 100, Issue 2; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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