Tensor correlations and the β-decay half-life of 132Sn

Abstract The β--decay half-lives of extremely neutron-rich nuclei are important for understanding nucleosynthesis in the r-process. However, most of their half-lives are unknown or very uncertain, leading to the need for reliable calculations. In this study, we updated the coefficients in recent semi-empirical formulae using the newly updated mass (AME2020) and half-life (NUBASE2020) databases to improve the accuracy of the half-life prediction. In particular, we developed a new empirical model for better calculations of the β--decay half-lives of isotopes ranging in Z = 10 – 80 and N = 15-130. We examined the β--decay half-lives of the extremely neutron-rich isotopes at and around the neutron magic numbers of N = 50, 82, and 126 using either five different semi-empirical models or finite-range droplet model and quasi-particle random phase approximation (FRDM+QRPA) method. The β--decay rates derived from the estimated half-lives were used in calculations to evaluate the impact of the half-life uncertainties of the investigated nuclei on the abundance of the r-process. The results show that the half-lives mostly range in 0.001 < T1/2 < 100 s for the nuclei with a ratio of N/Z < 1.9; however, they differ significantly for those with the ratio of N/Z > 1.9. The half-life differences among the models were found to range from a few factors (for N/Z < 1.9 nuclei) to four orders of magnitude (for N/Z > 1.9). These discrepancies lead to a large uncertainty, which is up to four orders of magnitude, in the r-process abundance of isotopes. We also found that the multiple-reflection time-of-flight (MR-TOF) technique is preferable for precise mass measurements because its measuring timescale applies to the half-lives of the investigated nuclei. Finally, the results of this study are useful for studies on the β-decay of unstable isotopes and astrophysical simulations.

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Precision nuclear β-decay half-life measurements

ISAC and ARIEL: The TRIUMF Radioactive Beam Facilities and the Scientific Program ◽

10.1007/978-94-007-7963-1_14 ◽

2013 ◽

pp. 133-136

Author(s):

Gordon C. Ball

Keyword(s):

Half Life ◽

Β Decay

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High-precision β decay half-life measurements of proton-rich nuclei for testing the CVC hypothesis

10.1063/1.3664172 ◽

2011 ◽

Author(s):

T. Kurtukian-Nieto ◽

Bertram Blank ◽

Keyword(s):

High Precision ◽

Half Life ◽

Β Decay

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Results from the Cuore Experiment †

Universe ◽

10.3390/universe5010010 ◽

2019 ◽

Vol 5 (1) ◽

pp. 10 ◽

Cited By ~ 2

Author(s):

Alessio Caminata ◽

Douglas Adams ◽

Chris Alduino ◽

Krystal Alfonso ◽

Frank Avignone ◽

...

Keyword(s):

Beta Decay ◽

Energy Resolution ◽

Half Life ◽

Precise Measurement ◽

Region Of Interest ◽

Neutrinoless Double Beta Decay ◽

Double Beta Decay ◽

Effective Energy ◽

Β Decay ◽

Compact Structure

The Cryogenic Underground Observatory for Rare Events (CUORE) is the first bolometric experiment searching for neutrinoless double beta decay that has been able to reach the 1-ton scale. The detector consists of an array of 988 TeO 2 crystals arranged in a cylindrical compact structure of 19 towers, each of them made of 52 crystals. The construction of the experiment was completed in August 2016 and the data taking started in spring 2017 after a period of commissioning and tests. In this work we present the neutrinoless double beta decay results of CUORE from examining a total TeO 2 exposure of 86.3 kg yr , characterized by an effective energy resolution of 7.7 keV FWHM and a background in the region of interest of 0.014 counts / ( keV kg yr ) . In this physics run, CUORE placed a lower limit on the decay half-life of neutrinoless double beta decay of 130 Te > 1.3 · 10 25 yr (90% C.L.). Moreover, an analysis of the background of the experiment is presented as well as the measurement of the 130 Te 2 ν β β decay with a resulting half-life of T 1 / 2 2 ν = [ 7.9 ± 0.1 ( stat . ) ± 0.2 ( syst . ) ] × 10 20 yr which is the most precise measurement of the half-life and compatible with previous results.

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The Half-life of 130Te Double β-decay

Zeitschrift für Naturforschung A ◽

10.1515/zna-1966-1-213 ◽

1966 ◽

Vol 21 (1-2) ◽

pp. 84-90 ◽

Cited By ~ 66

Author(s):

N. Takaoka ◽

K. Ogata

Keyword(s):

Half Life ◽

High Sensitivity ◽

General Tendency ◽

Β Decay ◽

A Value ◽

Three Samples ◽

Isotopic Analyses ◽

Isotopic Abundances ◽

Double Β Decay ◽

Small Excess

In order to determine the half-life of the 130Te double β-decay, the amounts and isotopic composition of xenon extracted from tellurium ores, from the Oya gold mine in Japan, have been measured with a high-sensitivity mass spectrometer. Compared with atmospheric xenon an excess was definitely found at mass numbers 129, 130 and 131 in the extracted xenon. The excess of 130Xe is predominant, the average amount in three samples being (1.32 ± 0.09) × 10-11 ccSTP/g 130Te. Attributing the excess 130Xe to the double β-decay of 130Te, the half-life is estimated to be (8.20 ± 0.64) × 1020 years, assuming an age of (9.06 ± 0.29) × 107 years for the Te ores. The latter value is the K-Ar age of porphyrite, which is in close geological connection with the Te ores.In order to investigate the other excesses than that of 130Xe, isotopic analyses were also carried out on Xe from three other Te ores from the same mine. The ratios (129Xe/131Xe) excess=1.58 and (129Xe/130Xe) excess = 2.1 were found to be the same for all samples. The origin of these excesses is discussed.In addition a small excess of 128Xe was found. If this is attributed to 128Te double β-decay, the half-life of 128Te is estimated to be 3 × 1022 years, a value shorter by about three orders of magnitude than the theoretically expected half-life. The above estimated half-life may be a lower limit of the 128Te half-life.The general tendency of the isotopic abundances (except for the above excesses), of the xenon extracted from Te ores seems to be to slightly increase in excess as one moves toward the lighter isotopes (as compared with atmospheric xenon).

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