Nuclear Data Sheets最新文献

The experimental results published before August 2022 from the various reaction and decay studies leading to nuclides of Z=51 to Z=67, ¹⁴¹Sb, ¹⁴¹Te, ¹⁴¹I, ¹⁴¹Xe, ¹⁴¹Cs, ¹⁴¹Ba, ¹⁴¹La, ¹⁴¹Ce, ¹⁴¹Pr, ¹⁴¹Nd, ¹⁴¹Pm, ¹⁴¹Sm, ¹⁴¹Eu, ¹⁴¹Gd, ¹⁴¹Tb, ¹⁴¹Dy, ¹⁴¹Ho in the A=141 mass chain have been reviewed and the data are presented together with adopted level schemes and properties. This work supersedes the previous evaluation of the A=141 nuclides by published by N. Nica in Nuclear Data Sheets 122, 1 (2014).

Evaluated nuclear structure and decay data for all nuclei with mass number A=201 (²⁰¹Os, ²⁰¹Ir, ²⁰¹Pt, ²⁰¹Au, ²⁰¹Hg, ²⁰¹Tl, ²⁰¹Pb, ²⁰¹Bi, ²⁰¹Po, ²⁰¹At, ²⁰¹Rn, ²⁰¹Fr, ²⁰¹Ra) 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/index.htm) developed by members of the NSDD network were used during the evaluation process. For example, the reported absolute γ-ray emission probabilities and their uncertainties in various decay data sets were determined using the GABS code. This work supersedes the earlier evaluation by F.G. Kondev (2007Ko06), published in Nuclear Data Sheets 108, 365 (2007).

Detailed level schemes, decay schemes, band structure, and the experimental data on which they are based are presented for all nuclei with mass number A=242. The experimental data are evaluated and adopted values are given for level and radiation properties. For references on theory refer to the NSR file at the web site given below under Cutoff Date:. This evaluation replaces the A=242 publication by Y. A. Akovali in Nuclear Data Sheets 96, 177 (2002) (2002Ak06).

Evaluated spectroscopic data and level schemes from radioactive decay and nuclear reaction studies are presented for ²⁴N, ²⁴O, ²⁴F, ²⁴Ne, ²⁴Na, ²⁴Mg, ²⁴Al, and ²⁴Si. This evaluation for A=24 supersedes the earlier one by R. B. Firestone (2007Fi14).

Highlights of this evaluation are the following:

In ²⁴O, the 7.4- and 7.65-MeV groups reported in ¹H(²⁴O,p′) (2012Ts03) and ⁹Be(²⁶F,nX) (2011Ho05), respectively, are considered as separate states in this evaluation, since the former one was observed to decay by only one neutron emission to ²³O, while the latter one by two sequential neutrons to ²²O. Based on assigned configurations, the 7.4- and 7.6-MeV groups are tentatively assigned negative and positive parities, respectively. Additional study would be useful to determine if these states are same or different.

In ²⁴Na, 2014Fi01 (n,γ) proposed J^π=(0,1,2)⁻ for 4048.8 keV level based on weaker population from the capture state (J^π=1⁺,2⁺) and mentioned to reexamine the J^π=0⁺ assignment, suggested in earlier evaluations (1990En08, 2007Fi02).

This evaluation includes the first observation of E0 transition, strength ρ²(E0)=0.380 70, for the 6432 keV transition from 0⁺ state at 6432 to 0⁺ g.s. in ²⁴Mg reported in 2020Do10. Authors proposed the first-excited 0⁺ state of ²⁴Mg to be superdeformed.

In ²⁴Al, the excited level energies deduced from (³He,t) measurements reported by different research groups vary significantly and it was not clear if some of those levels were same or different. Additional measurements are needed.