Nuclear Data Sheets最新文献

The half-life of ¹³⁴Cs has been determined through 882 and 471 activity measurements of two sources over 12 years with a re-entrant ionisation chamber in a temperature-stabilised room. The data were aggregated from in total 204 565 and 99 486 ionisation current measurements with 0.057 % standard deviation. The decay curves adhere to the exponential-decay law, devoid of any cyclic perturbations at daily, monthly, and multi-annual scales, maintaining an exceptionally low standard deviation of 0.0003 % on the amplitude. A discernible annual cycle with an amplitude of 0.0051 (3) % was effectively mitigated to an insignificant level of 0.0009 (3) % by compensating the residuals proportionally to daily variations in ambient humidity. The study yielded a half-life value for ¹³⁴Cs of 754.200 (53) d or 2.06493 (14) a, with a relative standard uncertainty of 0.0070 %. The result obtained in this work can be recommended as a reference value, owing to its high statistical accuracy and conservative estimate of systematic errors.

Experimental nuclear structure and decay data are evaluated for 13 known nuclides of mass number A=63 (Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Se). Detailed evaluated level properties and related information are presented and recommended spectroscopic parameters are provided, combining all the data from various reactions and decays. No excited state has been observed for ⁶³Ti, ⁶³As and ⁶³Se, among which the first two nuclides have no halflife, decay modes and spin-parity being measured and reported yet. The ground-state spins and/or parities of ⁶³V, ⁶³Cr, ⁶³Mn, and ⁶³Ge still have not been definitely determined and information for excited states in these nuclides plus ⁶³Fe is limited. Information for ⁶³Ga is mostly from one measurement and no data for ⁶³Ge ε+β⁺ decay have been measured while this decay mode (%100) of the ⁶³Ge parent is known. The ⁶³Cu nuclide is the most extensively studied via more than 28 different reactions and decays, followed by ⁶³Zn and ⁶³Ni. Among all those nuclides, only ⁶³Cu has a complete radioactive decay scheme. This work supersedes earlier full evaluations of A=63 published by 2001Ba27, 1991Ki10, 1979Au10, and 1975Au03.

Evaluated nuclear structure and decay data for all nuclei with mass number A=202 (²⁰²Os, ²⁰²Ir, ²⁰²Pt, ²⁰²Au, ²⁰²Hg, ²⁰²Tl, ²⁰²Pb, ²⁰²Bi, ²⁰²Po, ²⁰²At, ²⁰²Rn, ²⁰²Fr and ²⁰²Ra), are presented. All available experimental data are compiled and evaluated, and best values for level and γ-ray energies, quantum numbers, lifetimes, γ-ray intensities and transition probabilities, as well as other nuclear properties, are recommended. Inconsistencies and discrepancies that exist in the literature are discussed. A number of computer codes (https://www-nds.iaea.org/public/ensdf_pgm/) developed by members of the NSDD network were used during the evaluation process. This work supersedes the earlier evaluation by F.G. Kondev (2007Ko42), published in Nuclear Data Sheets 108, 1471 (2007).

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.