A laser ablation source for offline ion production at LEBIT

Izzo, C.; Bollen, G.; Bustabad, S.; Eibach, M.; Gulyuz, K.; Morrissey, D. J.; Redshaw, Matthew; Ringle, R.; Sandler, R.; Schwarz, S.; Valverde, A. A.

doi:10.1016/j.nimb.2015.12.019

Cited by 16 publications

(26 citation statements)

References 21 publications

(22 reference statements)

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“…2. LEBIT was designed for online measurements of rare isotopes from the Coupled Cyclotron Facility, but also houses two offline sources-a laser ablation source (LAS) [34] and a plasma ion source-that can be used for the production of stable and long-lived isotopes. These offline sources provide reference ions during rare isotope measurements, but also provide access to a wide range of isotopes that have been used for studies related to neutrinoless double β-decay [35][36][37][38][39][40], highly forbidden β-decays [7,8], and ultra-low Q value β-decays [41].…”

Section: Experimental Descriptionmentioning

confidence: 99%

Direct determination of the La138β -decay Q value using Penning trap mass spectrometry

et al. 2019

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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 138 La 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 138 La 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 138 La, 138 Ce and 138 Ba ions from which β-decay and EC Q values for 138 La were obtained.Results: The 138 La β-decay and EC Q values were measured to be Q β = 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 138 La β-decay shape factor and EC probabilities. New determinations for the 138 Ce 2EC Q value and the atomic masses of 138 La, 138 Ce, and 138 Ba are also reported. Conclusion:The 138 La 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 138 La 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.

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Section: Experimental Descriptionmentioning

confidence: 99%

Direct determination of the La138β -decay Q value using Penning trap mass spectrometry

et al. 2019

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“…With Q U L = −4.6(1.2) keV, it can now be said definitively that the 2313 keV excited state is not energetically viable for ultra-low Q-value decay. However, the 1/2 + excited state of 139 La, with an energy of 2310 (19) keV and Q U L = −1.6(19.0) keV, still has too large of an uncertainty for any definitive claims to be made. The energy of this excited state will need to be measured to a higher precision to determine if it is a candidate for an ultra-low Q-value β-decay.…”

Section: Resultsmentioning

confidence: 99%

“…For the decay of 139 Ba, one potential ultra-low Q-value decay channel to the 2313 keV level in 139 La with unknown J π has been refuted. However, the 1/2 + excited state in 139 La, currently measured to be 2310 (19)keV, is still a candidate. More precise measurements of the excitation energy of 139 La will be necessary to determine whether or not the β-decay of 139 Ba to this state is an ultra-low Q-value decay candidate.…”

Section: Discussionmentioning

confidence: 99%

Investigation of the potential ultralow Q -value β -decay candidates Sr89 and Ba

et al. 2019

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Background: Ultra-low 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 ultra-low 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 89 Y and 139 La. Use these new measurements along with the precisely known atomic masses of 89 Sr and 139 Ba and nuclear energy level data for 89 Y and 139 La to determine if there could be an ultra-low Q-value decay branch in the β-decay of 89 Sr → 89 Y or 139 Ba → 139 La.Method: High-precision Penning trap mass spectrometry was used to determine the atomic mass of 89 Y and 139 La, from which β-decay Q-values for 89 Sr and 139 Ba were obtained.Results: The 89 Sr → 89 Y and 139 Ba → 139 La β-decay Q-values were measured to be QSr = 1502.20(0.35) keV and QBa = 2308.37(0.68) keV. These results were compared to energies of excited states in 89 Y at 1507.4(0.1) keV, and in 139 La at 2310(19) keV and 2313(1) keV to determine Q-values of -5.20(0.37) keV for the potential ultra-low β-decay branch of 89 Sr and -1.6(19.0) keV and -4.6(1.2) keV for those of 139 Ba. Conclusion:The potential ultra-low Q-value decay branch of 89 Sr to the 89 Y (3/2 − , 1507.4 keV) state is energetically forbidden and has been ruled out. The potential ultra-low Q-value decay branch of 139 Ba to the 2313 keV state in 139 La with unknown J π has also been ruled out at the 4σ level, while more precise energy level data is needed for the 139 La (1/2 + , 2310 keV) state to determine if an ultra-low Q-value β-decay branch to this state is energetically allowed. * sandler@nscl.msu.edu 1 The energy of the 115 Sn (3/2 + ) state was recently measured more precisely to be 497.342 (3) keV [7].

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“…2. Cd + and In + ions were produced with a laser ablation ion source (LAS) [30], in which cadmium and indium foils with natural isotopic abundances were installed. In the LAS ions are extracted at an energy of 5 keV from the target foil and focused into a 90…”

Section: Experimental Methodsmentioning

confidence: 99%

Precise determination of theCd113fourth-forbidden non-uniqueβ-decayQvalue

et al. 2016

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Using Penning trap mass spectrometry, we have performed a precise determination of the Q value for the highly-forbidden β-decay of 113 Cd. An independent measurement of the Q value fixes the endpoint energy in a fit to the 113 Cd β-decay spectrum. This provides a strong test of systematics for detectors that have observed this decay, such as those developed for ββ-decay searches in cadmium and other isotopes. It will also aid in the theoretical description of the β-decay spectrum. The result, Q β = 323.89(27) keV, agrees at the 1.3σ level with the value obtained from the 2012 Atomic Mass Evaluation [Chin. Phys. C 36, 1603], but is a factor of almost four more precise. We also report improved values for the atomic masses of 113 Cd, 113 In and 112 Cd.

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A laser ablation source for offline ion production at LEBIT

Cited by 16 publications

References 21 publications

Direct determination of the La138β -decay Q value using Penning trap mass spectrometry

Direct determination of the La138β -decay Q value using Penning trap mass spectrometry

Investigation of the potential ultralow Q -value β -decay candidates Sr89 and Ba

Precise determination of theCd113fourth-forbidden non-uniqueβ-decayQvalue

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