Nuclear Data Sheets for A=205

Kondev, F. G.

doi:10.1016/j.nds.2020.05.001

Cited by 18 publications

(5 citation statements)

References 201 publications

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“…"Empirical" calculations, based on near-neighbor systematics, have been performed to estimate the energies of isomeric states. For this purpose, the average of 1-quasineutron energies from neighboring, odd-A Pb isotopes ( 203,205 Pb), and 1-quasiproton energies derived from the corresponding excited levels in 203 Tl, were used [26,27,33]. The neutron FIG.…”

Section: B "Empirical" Calculationsmentioning

confidence: 99%

Isomers in Tl203 and core excitations built on a five-nucleon-hole structure

et al. 2022

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Section: B "Empirical" Calculationsmentioning

confidence: 99%

Isomers in Tl203 and core excitations built on a five-nucleon-hole structure

et al. 2022

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Section: B "Empirical" Calculationsmentioning

confidence: 99%

Isomers in 203Tl and core excitations built on a five-nucleon-hole structure

Bothe,

Tandel,

Wahid

et al. 2021

Preprint

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Isomers with three-and five-nucleon-hole configurations have been established in 203 Tl. These include newly identified levels with a three-nucleon structure: I π = (15/2 − ) with T 1/2 = 7.9(5) ns, and I π = (35/2 − ) with T 1/2 = 4.0(5) ns. In addition, five-quasiparticle states: I π = (39/2 − ) with T 1/2 = 1.9(2) ns, and I π = (49/2 + ) with T 1/2 = 3.4(4) ns have also been established. The previously determined long-lived decay [T 1/2 = 6.6(3) µs from this work] is associated with isomerism of the I π = (29/2 + ) state. Levels above this long-lived isomer have been identified through a delayed-prompt coincidence measurement. Five-nucleon-hole states with excitation energies Ex ≈ 7 MeV have been established as well as possible octupole excitations of the 208 Pb core built on these levels. The level scheme of 203 Tl is extended up to Ex ≈ 11 MeV with the inclusion of 25 new transitions. Empirical and shell-model calculations have been performed to aid in the description of the observed states which are found to be predominantly of intrinsic character.

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“…93 Mo is one of the last four radionuclides (the other three being 91 Nb, 205 Pb and 236 Np 5 – 9 ) with a half-life longer than 1 year and less than 100 million years whose half-life was never measured directly. 93 Mo decays purely via electron capture (EC) to the metastable 93m Nb ( T 1/2 = 16.12(12) y) and the ground state of 93 Nb.…”

Section: Introductionmentioning

confidence: 99%

First direct determination of the 93Mo half-life

Kajan

Heinitz

Kossert

et al. 2021

Sci Rep

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This work presents the first direct measurement of the 93Mo half-life. The measurement is a combination of high-resolution mass spectrometry for the determination of the 93Mo concentration and liquid scintillation counting for determining the specific activity. A 93Mo sample of high purity was obtained from proton irradiated niobium by chemical separation of molybdenum with a decontamination factor larger than 1.6 × 1014 with respect to Nb. The half-life of 93Mo was deduced to be 4839(63) years, which is more than 20% longer than the currently adopted value, whereas the relative uncertainty could be reduced by a factor of 15. The probability that the 93Mo decays to the metastable state 93mNb was determined to be 95.7(16)%. This value is a factor of 8 more precise than previous estimations. Due to the man-made production of 93Mo in nuclear facilities, the result leads to significantly increased precision for modelling the low-level nuclear waste composition. The presented work demonstrates the importance of chemical separations in combination with state-of-the-art analysis techniques, which are inevitable for precise and accurate determinations of nuclear decay data.

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Nuclear Data Sheets for A=205

Cited by 18 publications

References 201 publications

Isomers in Tl203 and core excitations built on a five-nucleon-hole structure

Isomers in Tl203 and core excitations built on a five-nucleon-hole structure

Isomers in 203Tl and core excitations built on a five-nucleon-hole structure

First direct determination of the 93Mo half-life

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