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Title: Mass and Double-Beta-Decay Q Value of {sup 136}Xe

Abstract

The atomic mass of {sup 136}Xe has been measured by comparing cyclotron frequencies of single ions in a Penning trap. The result, with 1 standard deviation uncertainty, is M({sup 136}Xe)=135.907 214 484 (11) u. Combined with previous results for the mass of {sup 136}Ba [Audi, Wapstra, and Thibault, Nucl. Phys. A 729, 337 (2003)], this gives a Q value (M[{sup 136}Xe]-M[{sup 136}Ba])c{sup 2}=2457.83(37) keV, sufficiently precise for ongoing searches for the neutrinoless double-beta decay of {sup 136}Xe.

Authors:
; ; ;  [1]
  1. Department of Physics, Florida State University, Tallahassee, Florida 32306-4350 (United States)
Publication Date:
OSTI Identifier:
20960139
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 5; Other Information: DOI: 10.1103/PhysRevLett.98.053003; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BARIUM 136; CYCLOTRON FREQUENCY; DOUBLE BETA DECAY; MASS; Q-VALUE; XENON 136

Citation Formats

Redshaw, Matthew, Wingfield, Elizabeth, McDaniel, Joseph, and Myers, Edmund G. Mass and Double-Beta-Decay Q Value of {sup 136}Xe. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.98.053003.
Redshaw, Matthew, Wingfield, Elizabeth, McDaniel, Joseph, & Myers, Edmund G. Mass and Double-Beta-Decay Q Value of {sup 136}Xe. United States. doi:10.1103/PHYSREVLETT.98.053003.
Redshaw, Matthew, Wingfield, Elizabeth, McDaniel, Joseph, and Myers, Edmund G. Fri . "Mass and Double-Beta-Decay Q Value of {sup 136}Xe". United States. doi:10.1103/PHYSREVLETT.98.053003.
@article{osti_20960139,
title = {Mass and Double-Beta-Decay Q Value of {sup 136}Xe},
author = {Redshaw, Matthew and Wingfield, Elizabeth and McDaniel, Joseph and Myers, Edmund G.},
abstractNote = {The atomic mass of {sup 136}Xe has been measured by comparing cyclotron frequencies of single ions in a Penning trap. The result, with 1 standard deviation uncertainty, is M({sup 136}Xe)=135.907 214 484 (11) u. Combined with previous results for the mass of {sup 136}Ba [Audi, Wapstra, and Thibault, Nucl. Phys. A 729, 337 (2003)], this gives a Q value (M[{sup 136}Xe]-M[{sup 136}Ba])c{sup 2}=2457.83(37) keV, sufficiently precise for ongoing searches for the neutrinoless double-beta decay of {sup 136}Xe.},
doi = {10.1103/PHYSREVLETT.98.053003},
journal = {Physical Review Letters},
number = 5,
volume = 98,
place = {United States},
year = {Fri Feb 02 00:00:00 EST 2007},
month = {Fri Feb 02 00:00:00 EST 2007}
}
  • The high-resolution, deflection-type mass spectrometer, Manitoba II, has been used to determine directly the mass difference {sup 136}Xe-{sup 136}Ba to be 2639.6 (0.6) {mu}u, giving Q{sub {beta}{beta}}=2458.7 (0.6) keV.
  • The atomic masses of {sup 130}Te and {sup 130}Xe have been obtained by measuring cyclotron frequency ratios of pairs of triply charged ions simultaneously trapped in a Penning trap. The results, with 1 standard deviation uncertainty, are M({sup 130}Te)=129.906 222 744(16) u and M({sup 130}Xe)=129.903 509 351(15) u. From the mass difference the double-{beta}-decay Q value of {sup 130}Te is determined to be Q{sub {beta}}{sub {beta}}({sup 130}Te)=2527.518(13) keV. This is a factor of 150 more precise than the result of the AME2003 [G. Audi et al., Nucl. Phys. A729, 337 (2003)].
  • A search for double-beta decays of 136Xe to excited states of 136Ba has been performed with the first phase data set of the KamLAND-Zen experiment. The 0 1 + , 2 1 + and 2 2 + transitions of 0νββ decay were evaluated in an exposure of 89.5 kg•yr of 136Xe, while the same transitions of 2νββ decay were evaluated in an exposure of 61.8 kg•yr. No excess over background was found for all decay modes. The lower half-life limits of the 2 1 + state transitions of 0νββ and 2νββ decay were improved to Tmore » $$0v\atop{1/2}$$(0 + →2 1 +) > 2.6×10 25 yr and T$$2v\atop{1/2}$$ (0 + →2 1 +) > 4.6×10 23 yr (90% C.L.), respectively. We report on the first experimental lower half-life limits for the transitions to the 0 1 + state of 136Xe for 0νββ and 2νββ decay. They are T$$0v\atop{1/2}$$(0 + →0 1 +) > 2.4×10 25 yr and T$$2v\atop{1/2}$$(0 + →0 1 +) > 8.3×10 23 yr (90% C.L.). The transitions to the 2 2 + states are also evaluated for the first time to be T$$0v\atop{1/2}$$(0 + →2 2 +) > 2.6×10 25 yr and T$$2v\atop{1/2}$$(0 + →2 2 +) > 9.0×10 23 yr (90% C.L.). Finally, these results are compared to recent theoretical predictions.« less
  • In order to determine the life of double beta decay of {sup 136}Xe from measurements of the decay daughters with a time-of-flight mass spectrometer, the transparency of the system was obtained to be 0.56 by measuring total charges produced by a laser beam for RIS with charge sensitive amplifier systems.
  • The Q value of the {sup 112}Sn double-beta decay was determined by using a Penning trap mass spectrometer. The new atomic-mass difference between {sup 112}Sn and {sup 112}Cd of 1919.82(16) keV is 25 times more precise than the previous value of 1919(4) keV. This result removes the possibility of enhanced resonance capture of the neutrinoless double-EC decay to the excited 0{sup +} state at 1871.00(19) keV in {sup 112}Cd.