Nuclear data sheets for A = 137

Bunting, R.L.

doi:10.1016/s0090-3752(75)80079-2

Cited by 39 publications

(11 citation statements)

References 87 publications

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“…Data have been taken from [14] for 129Te, ! [15] for 131Xe, [16] for 133Ba, [17] for 135Ce, [18] for 13VNd and from the present work for la9Sm. The pattern described by these states bears a strong resemblance to that observed in the odd-A, N= 79 nuclei [19].…”

Section: Discussionsupporting

confidence: 59%

Decay properties of139mSm and139Eu

Deslauriers

Gujrathi

Mark

et al. 1986

Z. Physik A - Atomic Nuclei

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The structure of 1398m is investigated through the decay properties of 139roam and ~39Eu. The decay of 139mSm is measured to have a half-life of (10.7_+0.6) s. Gamma-ray and internal conversion electron measurements lead to the construction of a decay pattern comprising seven transitions among five states. The decay of a39Eu with a measured half-life of (17.9_+0.6)s is studied with beta decay spectroscopy techniques. A decay scheme consisting fourteen states in 1398m is proposed. Using deduced ft values and transition multipolarities, J~ assignments are made. Nuclear systematics of the odd-A, N= 77 and 76 are discussed.

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Section: Discussionsupporting

confidence: 59%

Decay properties of139mSm and139Eu

Deslauriers

Gujrathi

Mark

et al. 1986

Z. Physik A - Atomic Nuclei

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“…It is abundantly found in spent fuel and in exchange resins used to purify coolant water in nuclear power plants [1]. It is highly soluble, chemically reactive [2], and it has an intermediate half life of 30.17 years [3] along with a high radioactivity of 3.2 × 10 12 Bq/g [3][4][5]. It can penetrate into the soil and enter the food chain [6], making this element dangerous to human health.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics, kinetics, and mechanics of cesium sorption in cement paste: A multiscale assessment

Arayro

Dufresne

Zhou

et al. 2018

Phys. Rev. Materials

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Cesium-137 is a common radioactive byproduct found in nuclear spent fuel. Given its 30 year half life, its interactions with potential storage materials-such as cement paste-is of crucial importance. In this paper, simulations are used to establish the interaction of calcium silicate hydrates (C-S-H)-the main binding phase of cement paste-with Cs at the nano-and mesoscale. Different C-S-H compositions are explored, including a range of Ca/Si ratios from 1.0 to 2.0. These calculations are based on a set of 150 atomistic models, which qualitatively and quantitatively reproduce a number of experimentally measured features of C-S-H-within limits intrinsic to the approximations imposed by classical molecular dynamics and the steps followed when building the models. A procedure where hydrated Ca 2+ ions are swapped for Cs 1+ ions shows that Cs adsorption in the C-S-H interlayer is preferred to Cs adsorption at the nanopore surface when Cs concentrations are lower than 0.19 Mol/kg. Interlayer sorption decreases as the Ca/Si ratio increases. The activation relaxation technique nouveau is used to access timescales out of the reach of traditional molecular dynamics (MD). It indicates that characteristic diffusion time for Cs 1+ in the C-S-H interlayer is on the order of a few hours. Cs uptake in the interlayer has little impact on the elastic response of C-S-H. It leads to swelling of the C-S-H grains, but mesoscale calculations that access length scales out of the range of MD indicate that this leads to practically negligible expansive pressures for Cs concentrations relevant to nuclear waste repositories.

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“…However, the 3/2 + state is preferred because the 11/2-state in all the other N = 79 isotones decays to the 3/2 + via an M4 transition and, also, an Figure 3. The data for the other N=79 isotones are taken from references [1][2][3]8] and those for the N=81 isotones from [1-3, 17, 183. In computing the B(M4) values, the theoretical internal conversion coefficients have been used.…”

Section: Discussionmentioning

confidence: 99%

Search for a 11/2??3/2+ M 4 transition in141Sm

et al. 1976

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The electromagnetic decay of the 11/2-141,,Sm is investigated. Internal conversion electron and X-ray-conversion electron coincidence measurements indicate that the state undergoes fl+ and electron capture decay with 99.69% strength and the remaining 0.31% goes to a 174.2_+0.3 keV M4 transition. The K/L conversion electron intensity ratio for the transition is measured to be 1.7___0.4. The energy of the 11/2-is established at 175.8_+ 0.3 keV above the 1/2 + ground state in l~*Sm. Systematics of the M4 transitions in the N--79 and 81 isotones are discussed.

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Nuclear data sheets for A = 137

Cited by 39 publications

References 87 publications

Decay properties of139mSm and139Eu

Decay properties of139mSm and139Eu

Thermodynamics, kinetics, and mechanics of cesium sorption in cement paste: A multiscale assessment

Search for a 11/2??3/2+ M 4 transition in141Sm

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