Precise determination of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Cd</mml:mi><mml:mprescripts /><mml:none /><mml:mn>113</mml:mn></mml:mmultiscripts></mml:math>fourth-forbidden non-unique<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math>-decay<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>Q</mml:mi></mml:math>value

Gamage, N. D.; Bollen, G.; Eibach, M.; Gulyuz, K.; Izzo, C.; Kandegedara, R. M. Eranjan B.; Redshaw, Matthew; Ringle, R.; Sandler, R.; Valverde, A. A.

doi:10.1103/physrevc.94.025505

Cited by 10 publications

(7 citation statements)

References 47 publications

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“…The Q value also defines the end-point of the β-decay energy spectrum, which provides a strong test of systematics for detectors used to observe these decays, e.g. as was done in the case of 113 Cd [11]. In addition we report improved values for the atomic masses of 46,47,49,50 Ti, 50,51 V, and 50,52−54 Cr.…”

Section: Figmentioning

confidence: 76%

“…However, offline sources, including a plasma source and a recently commissioned laser ablation source (LAS) [14] enable access to a wide range of stable and long-lived isotopes. Ions from these sources are used for calibration purposes and for mass and Q value determinations with applications, for example, in nuclear and neutrino physics [11,[15][16][17][18][19][20]. A schematic diagram of the sections of the LEBIT facility used in this work is shown in Fig.…”

Section: Experimental Methodsmentioning

confidence: 99%

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β -decay Q values among the A=50 Ti-V-Cr isobaric triplet and atomic masses of Ti<

et al. 2017

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Using high-precision Penning trap mass spectrometry at the LEBIT facility we have measured the Q values of the 4th order forbidden β-decay and electron capture of 50 V and the double electron capture Q value of 50 Cr with the results Q β (50 V) = 1038.1(1) keV, QEC (50 V) = 2208.7(1) keV, Q2EC (50 Cr) = 1170.5(1) keV. In addition, we have measured the atomic masses of 46,47,49,50 Ti, 50,51 V, and 50,52−54 Cr, reducing uncertainties by factors of up to 3 compared to the most recent atomic mass evaluation (Ame2016) [M. Wang, et.al ., Chin. Phys. 41, 030003 (2017)]. Our results are in good agreement with Ame2016 for 46,47,49,50 Ti and 50,54 Cr, and show deviations of up to ∼1 keV (2.5σ) for 50,51 V and 50,54 Cr.

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Section: Figmentioning

confidence: 76%

Section: Experimental Methodsmentioning

confidence: 99%

β -decay Q values among the A=50 Ti-V-Cr isobaric triplet and atomic masses of Ti<

et al. 2017

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“…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%

“…In addition to the exotic neutrinoless double βdecay process [3], interest in other rare weak decay processes such as ultra-low Q value β-decays [4] and forbidden β-decays e.g. [5][6][7][8], has grown in recent years. The need for more precise β-spectrum shape measurements and calculations for forbidden β-decays is becoming apparent in a number of applications [9].…”

Section: Introductionmentioning

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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“…The atomic masses of 89 Y and 139 La were measured at the Low Energy Beam and Ion Trap (LEBIT) facility, located at the National Superconducting Cyclotron Laboratory (NSCL) [18]. While LEBIT was designed to perform on-line mass measurements of rare isotopes from the NSCL produced via projectile fragmentation, it also houses a Laser Ablation Source (LAS) [19] and a Thermal Ion Source (TIS) which can be used to produce stable and long-lived isotopes for use as reference masses and for offline measurements with applications in neutrino and nuclear physics [20][21][22][23][24][25][26][27][28]. For the 139 La measurement, the LAS was fitted with a 25mm × 25mm × 1mm thick sheet of lanthanum [29], used to produce 139 La + (99.9% natural abundance).…”

Section: Experiments Descriptionmentioning

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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Precise determination of theCd113fourth-forbidden non-uniqueβ-decayQvalue

Cited by 10 publications

References 47 publications

β -decay Q values among the A=50 Ti-V-Cr isobaric triplet and atomic masses of Ti<

β -decay Q values among the A=50 Ti-V-Cr isobaric triplet and atomic masses of Ti<

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

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