Nuclear Data Sheets最新文献

The evaluated spectroscopic data are presented for these nuclides: ²⁴⁹U, ²⁴⁹Np, ²⁴⁹Pu, ²⁴⁹Am, ²⁴⁹Cm, ²⁴⁹Bk, ²⁴⁹Cf, ²⁴⁹Es ²⁴⁹Fm, ²⁴⁹Md and ²⁴⁹No. This work supersedes the earlier full evaluation of A=249 published by 2011Ab07.

The experimental results published before September 2023 from the various reaction and decay studies leading to nuclides of Z=60 to Z=76, ¹⁶²Nd, ¹⁶²Pm, ¹⁶²Sm, ¹⁶²Eu, ¹⁶²Gd, ¹⁶²Tb, ¹⁶²Dy, ¹⁶²Ho, ¹⁶²Er, ¹⁶²Tm, ¹⁶²Yb, ¹⁶²Lu, ¹⁶²Hf, ¹⁶²Ta, ¹⁶²W, ¹⁶²Re ¹⁶²Os, in the A=162 mass chain have been reviewed. These data are summarized and presented, together with adopted level schemes and properties. This work is intended to supersede the previous evaluation of the A=162 nuclides by C.W.Reich (2007Re16), which was published in Nuclear Data Sheets 108, 1807 (2007).

Evaluated spectroscopic data and level schemes from radioactive decay and nuclear reaction studies are presented for ¹⁹¹Hf, ¹⁹¹Ta, ¹⁹¹W, ¹⁹¹Re, ¹⁹¹Os, ¹⁹¹Ir, ¹⁹¹Pt, ¹⁹¹Au, ¹⁹¹Hg, ¹⁹¹Tl, ¹⁹¹Pb, ¹⁹¹Bi, ¹⁹¹Po, and ¹⁹¹At. This evaluation for A=191 supersedes the earlier one by V.R. Vanin et. al. (2007Va21), published in Nuclear Data Sheets 108, 2393 (2007).

The experimental nuclear spectroscopic data for known nuclides of mass number 76 (Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Se, Br, Kr, Rb, Sr, Y) have been evaluated and presented together with Adopted properties for levels and γ rays. With the exception of structure data for ⁷⁶Ga nucleus, significant new data have been incorporated for all the other nuclides of A=76 since the previous 1995 update in ENSDF database and NDS publication 1995Si03. No data are yet available for excited states in ⁷⁶Fe, ⁷⁶Cu and ⁷⁶Y. Decay scheme characteristics for the decay of ⁷⁶Co, ⁷⁶Ni, and ⁷⁶Y are unknown while those for decays of ⁷⁶Cu and ⁷⁶Sr seem incomplete. For ⁷⁶Ni, very little structure data are available, and for ⁷⁶Ga and ⁷⁶As, only low-spin ($\text{J}<4$ or so) information is available. This work supersedes the data presented in the previous (1995Si03) NDS evaluation of A=76.

Experimental nuclear spectroscopic data are compiled and evaluated for 18 known nuclides of mass 165 (Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Hf, Ta, W, Re, Os, Ir, Pt). Detailed information is presented for each reaction and decay experiment. Combining all the available data, recommended values are provided for energies, spins and parities, and half-lives of levels, with energies, branching ratios and multipolarities of γ radiations, and characteristics of β and α radiations in radioactive decays. ¹⁶⁵Dy, ¹⁶⁵Ho, ¹⁶⁵Er, ¹⁶⁵Tm, ¹⁶⁵Yb, ¹⁶⁵Lu and ¹⁶⁵Hf are among the most extensively studied nuclides via decay and high-spin gamma-ray spectroscopy measurements, followed by limited data for ¹⁶⁵Tb, ¹⁶⁵Ta, ¹⁶⁵W, ¹⁶⁵Re, and ¹⁶⁵Os. No excited states have yet been identified in ¹⁶⁵Sm, ¹⁶⁵Gd, and ¹⁶⁵Pt, while for ¹⁶⁵Eu and ¹⁶⁵Ir, information is available for only the g.s. and an isomer, but with no γ rays. This work supersedes earlier evaluation of A=165 nuclides by 2006Ja09.

Precise integral measurement of fast neutron-induced fission product yields for various actinides is of high interest for applied nuclear science. The goal of this effort is to improve uncertainties in fission product yield values of ²³⁷Np. Fission was induced in a NpO₂(NO₃) target using the Godiva IV critical assembly in burst mode. The irradiated sample was transferred to a high-resolution γ-ray detection setup within 50 minutes. γ-ray list mode data was collected from 50 minutes to 1 week after the irradiation. γ-ray spectroscopy was performed to analyze the time dependent γ-ray yields using an automated peak search algorithm to identify isotopes by their decay γ-ray energy and half-life. The initial activity for each isotope identified was used to calculate their fission product yield.