Nuclear Data Sheets for A = 81

Baglin, Coral M.

doi:10.1006/ndsh.1996.0014

Cited by 32 publications

(9 citation statements)

References 126 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…9 for γ-and e − -decay channels. Our average value of 13.4 ± 0.7 s agrees well with the earlier value of 13.10 ± 0.03 s [8].…”

Section: Mass A=81supporting

confidence: 92%

“…8. The values of α K /α L+M for the 190.5 keV isomeric transition in 81 Kr from literature [8] and the one measured in this work. The dashed lines show the theoretical values [18].…”

Section: Mass A=85mentioning

confidence: 55%

“…As can be seen from fig. 3, the neutrino capture on 81 Br should predominantly populate the isomeric state at 190.5 keV in 81 Kr because this allowed transition has to be six orders of magnitude stronger than the capture to the ground state of 81 Kr, whose inverse rate is well known [8]. Thus, the rates for all decay branches of 81m Kr, which are electron capture, internal conversion and γ-decay, are needed to derive the electron capture probability.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Isomers of astrophysical interest in neutron-deficient nuclei at masses A = 81, 85 and 86

et al. 2005

View full text Add to dashboard Cite

Decay properties of neutron-deficient exotic nuclei close to A = 80 have been investigated at the IGISOL facility. The studied nuclei, 81 Y, 81 Sr, 81m Kr, 85 Nb, 85 Zr, 86 Mo and 86 Nb, were produced by a 32 S beam from the Jyväskylä isochronous cyclotron on 54 Fe and nat Ni targets. The internal conversion coefficient for a 190.5 keV isomeric transition in 81m Kr has been measured and the internal transition rate has been determined. The internal transition rate has been used to estimate a neutrino capture rate on 81 Br, which yields a log ft of 5.13 ± 0.09 for the reaction 81 Br(ν, e −) 81m Kr. A new isomer with a half-life of 3.3 ± 0.9 s has been observed in 85 Nb. The existence of an earlier reported isomer with a half-life of 56 s in 86 Nb has not been confirmed.

show abstract

“…9 for γ-and e − -decay channels. Our average value of 13.4 ± 0.7 s agrees well with the earlier value of 13.10 ± 0.03 s [8].…”

Section: Mass A=81supporting

confidence: 92%

“…8. The values of α K /α L+M for the 190.5 keV isomeric transition in 81 Kr from literature [8] and the one measured in this work. The dashed lines show the theoretical values [18].…”

Section: Mass A=85mentioning

confidence: 55%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Isomers of astrophysical interest in neutron-deficient nuclei at masses A = 81, 85 and 86

et al. 2005

View full text Add to dashboard Cite

show abstract

“…1967; Marti 1967; Herzog 2005) was calculated for our samples. When the CRE age is sufficiently long relative to the half‐life of 81 Kr (0.229 Myr: Baglin 2008), the 81 Kr‐Kr age, T 81 , is approximated as …”

Section: Resultsmentioning

confidence: 99%

⁸¹Kr‐Kr age and multiple cosmic‐ray exposure history of the Vaca Muerta mesosiderite

Bajo¹,

Nagao

2011

Meteorit & Planetary Scien

View full text Add to dashboard Cite

Abstract-Noble gas isotopic compositions were measured for a eucritic pebble and bulk material of a silicate-metal mixture from the Vaca Muerta mesosiderite as well as pyroxene and plagioclase separated from the eucritic pebble by total melting and stepwise heating methods. Trapped noble gases were degassed completely by a high-temperature thermal event, probably at the formation of the Vaca Muerta parent body (VMPB). The presence of fissiogenic Xe isotopes from extinct 244 Pu in the bulk samples might be a result of rapid cooling from an early high-temperature metamorphism. High concentrations of cosmogenic noble gases enabled us to determine precise isotopic ratios of cosmogenic Kr and Xe. Spallogenic Ne from Na and unique Ar isotopic compositions were observed. The 81 Kr-Kr exposure age of 168 ± 8 Myr for the silicate pebble is distinctly longer than the age of 139 ± 8 Myr for the bulk samples. The precursor of the pebble had been irradiated on the surface of the VMPB for more than 60 Myr (first stage irradiation), with subsequent incorporation into bulk materials approximately 4 Gyr ago. The Vaca Muerta meteorite was excavated from the VMPB 140 Myr ago (second stage irradiation). Relative diffusion rates among the cosmogenic Ar, Kr, and Xe based on data obtained by stepwise heating indicate that Kr and Xe can be partially retained in pyroxene and plagioclase under the condition that resets the K-Ar system. This result supports the presence of fission Xe and of excess concentration of cosmogenic Kr, which could have survived the thermal event approximately 3.8 Gyr ago.

show abstract

“…The 81 Kr (half‐life = 229 ± 11 kyr; Baglin, ) in the atmosphere is also cosmogenic in origin and records the GCR flux on the time scale of 10 5 years. 81 Kr provides a complementary perspective to that of 10 Be (or 36 Cl) because of differences in their transport and residence properties in the atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Atmospheric ⁸¹Kr as an Integrator of Cosmic‐Ray Flux on the Hundred‐Thousand‐Year Time Scale

Zappala

Baggenstos

Gerber

et al. 2020

Geophysical Research Letters

View full text Add to dashboard Cite

The atmospheric abundance of 81Kr is a global integrator of cosmic rays. It is insensitive to climate shifts, geographical variations, and short‐term solar cycle activity, making it an ideal standard to test models of cosmic‐ray flux on the time scale of 105 years. Here we present the first calculation of absolute 81Kr production rates in the atmosphere, and a measurement of the atmospheric 81Kr/Kr abundance via the Atom Trap Trace Analysis method. The measurement result significantly deviates from previously reported values. The agreement between measurement and model prediction supports the current understanding of the production mechanisms. Additionally, the calculated 81Kr atmospheric inventory over the past 1.5 Myr provides a more accurate input function for radiokrypton dating.

show abstract

Nuclear Data Sheets for A = 81

Cited by 32 publications

References 126 publications

Isomers of astrophysical interest in neutron-deficient nuclei at masses A = 81, 85 and 86

Isomers of astrophysical interest in neutron-deficient nuclei at masses A = 81, 85 and 86

⁸¹Kr‐Kr age and multiple cosmic‐ray exposure history of the Vaca Muerta mesosiderite

Atmospheric ⁸¹Kr as an Integrator of Cosmic‐Ray Flux on the Hundred‐Thousand‐Year Time Scale

Contact Info

Product

Resources

About

Nuclear Data Sheets for A = 81

Cited by 32 publications

References 126 publications

Isomers of astrophysical interest in neutron-deficient nuclei at masses A = 81, 85 and 86

Isomers of astrophysical interest in neutron-deficient nuclei at masses A = 81, 85 and 86

81Kr‐Kr age and multiple cosmic‐ray exposure history of the Vaca Muerta mesosiderite

Atmospheric 81Kr as an Integrator of Cosmic‐Ray Flux on the Hundred‐Thousand‐Year Time Scale

Contact Info

Product

Resources

About

⁸¹Kr‐Kr age and multiple cosmic‐ray exposure history of the Vaca Muerta mesosiderite

Atmospheric ⁸¹Kr as an Integrator of Cosmic‐Ray Flux on the Hundred‐Thousand‐Year Time Scale