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Title: β -decay Q values among the A = 50 Ti-V-Cr isobaric triplet and atomic masses of Ti 46 , 47 , 49 , 50 , V 50 , 51 , and Cr 50 , 52 54

Abstract

This manuscript describes a measurement of the Q value for the highly forbidden beta-decays of 50V and the double electron capture decay of 50Cr. The Q value corresponds to the total energy released during the decay and is equivalent to the mass difference between parent and daughter atoms. This mass difference was measured using high precision Penning trap mass spectrometry with the Low Energy Beam and Ion Trap facility at the National Superconducting Cyclotron Laboratory. The Q value enters into theoretical calculations of the half-life and beta-decay spectrum for the decay, so improves these calculations. In addition the Q value corresponds to the end point energy of the beta-decay spectrum, which has been precisely measured for several highly-forbidden decays using modern low background detector techniques. Hence, our Q value measurements provide a test of systematics for these detectors. In addition, we have measured the absolute atomic masses of 46,47,49,50Ti, 50,51V, and 50,52-52Cr, providing improvements in precision by factors of up to 3. These atomic masses help to strengthen global evaluations of all atomic mass data, such as the Atomic Mass Evaluation.

Authors:
 [1];  [2];  [3];  [1];  [4];  [5];  [6];  [4];  [7];  [8]
  1. Central Michigan Univ., Mount Pleasant, MI (United States)
  2. Facility for Rare Isotope Beams, East Lansing, MI (United States); Michigan State Univ., East Lansing, MI (United States)
  3. National Superconducting Cyclotron Lab., East Lansing, MI (United States); Univ. Greifswald, Greifswald (Germany)
  4. National Superconducting Cyclotron Lab., East Lansing, MI (United States)
  5. Michigan State Univ., East Lansing, MI (United States); National Superconducting Cyclotron Lab., East Lansing, MI (United States)
  6. Central Michigan Univ., Mount Pleasant, MI (United States); National Superconducting Cyclotron Lab., East Lansing, MI (United States)
  7. Central Michigan Univ., Mount Pleasant, MI (United States); Michigan State Univ., East Lansing, MI (United States); National Superconducting Cyclotron Lab., East Lansing, MI (United States)
  8. Michigan State Univ., East Lansing, MI (United States); National Superconducting Cyclotron Lab., East Lansing, MI (United States); Univ. of Notre Dame, Notre Dame, IN (United States)
Publication Date:
Research Org.:
Central Michigan Univ., Mount Pleasant, MI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1401972
Grant/Contract Number:
SC0015927
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 96; Journal Issue: 4; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Kandegedara, R. M. E. B., Bollen, G., Eibach, M., Gamage, N. D., Gulyuz, K., Izzo, C., Redshaw, M., Ringle, R., Sandler, R., and Valverde, A. A. β-decay Q values among the A=50 Ti-V-Cr isobaric triplet and atomic masses of Ti46,47,49,50,V50,51 , and Cr50,52–54. United States: N. p., 2017. Web. doi:10.1103/PhysRevC.96.044321.
Kandegedara, R. M. E. B., Bollen, G., Eibach, M., Gamage, N. D., Gulyuz, K., Izzo, C., Redshaw, M., Ringle, R., Sandler, R., & Valverde, A. A. β-decay Q values among the A=50 Ti-V-Cr isobaric triplet and atomic masses of Ti46,47,49,50,V50,51 , and Cr50,52–54. United States. doi:10.1103/PhysRevC.96.044321.
Kandegedara, R. M. E. B., Bollen, G., Eibach, M., Gamage, N. D., Gulyuz, K., Izzo, C., Redshaw, M., Ringle, R., Sandler, R., and Valverde, A. A. 2017. "β-decay Q values among the A=50 Ti-V-Cr isobaric triplet and atomic masses of Ti46,47,49,50,V50,51 , and Cr50,52–54". United States. doi:10.1103/PhysRevC.96.044321.
@article{osti_1401972,
title = {β-decay Q values among the A=50 Ti-V-Cr isobaric triplet and atomic masses of Ti46,47,49,50,V50,51 , and Cr50,52–54},
author = {Kandegedara, R. M. E. B. and Bollen, G. and Eibach, M. and Gamage, N. D. and Gulyuz, K. and Izzo, C. and Redshaw, M. and Ringle, R. and Sandler, R. and Valverde, A. A.},
abstractNote = {This manuscript describes a measurement of the Q value for the highly forbidden beta-decays of 50V and the double electron capture decay of 50Cr. The Q value corresponds to the total energy released during the decay and is equivalent to the mass difference between parent and daughter atoms. This mass difference was measured using high precision Penning trap mass spectrometry with the Low Energy Beam and Ion Trap facility at the National Superconducting Cyclotron Laboratory. The Q value enters into theoretical calculations of the half-life and beta-decay spectrum for the decay, so improves these calculations. In addition the Q value corresponds to the end point energy of the beta-decay spectrum, which has been precisely measured for several highly-forbidden decays using modern low background detector techniques. Hence, our Q value measurements provide a test of systematics for these detectors. In addition, we have measured the absolute atomic masses of 46,47,49,50Ti, 50,51V, and 50,52-52Cr, providing improvements in precision by factors of up to 3. These atomic masses help to strengthen global evaluations of all atomic mass data, such as the Atomic Mass Evaluation.},
doi = {10.1103/PhysRevC.96.044321},
journal = {Physical Review C},
number = 4,
volume = 96,
place = {United States},
year = 2017,
month =
}

Journal Article:
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  • Experimental searches for neutrinoless double-β decay offer one of the best opportunities to look for physics beyond the standard model. Detecting this decay would confirm the Majorana nature of the neutrino, and a measurement of its half-life can be used to determine the absolute neutrino mass scale. Important to both tasks is an accurate knowledge of the Q value of the double-β decay. The LEBIT Penning trap mass spectrometer was used for the first direct experimental determination of the ⁹⁶Zr double-β decay Q value: Q ββ=3355.85(15) keV. This value is nearly 7 keV larger than the 2012 Atomic Mass Evaluationmore » [M. Wang et al., Chin. Phys. C 36, 1603 (2012)] value and one order of magnitude more precise. The 3-σ shift is primarily due to a more accurate measurement of the ⁹⁶Zr atomic mass: m(⁹⁶Zr)=95.90827735(17) u. Using the new Q value, the 2νββ-decay matrix element, |M |, is calculated. Improved determinations of the atomic masses of all other zirconium ( 90-92,94,96Zr) and molybdenum ( 92,94-98,100Mo) isotopes using both ¹²C₈ and ⁸⁷Rb as references are also reported.« less
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