Letter to the editorThe energy of the40K gamma ray and its use as a calibration standard
Abstract
The energy of the40K gamma ray has been re-measured in order to increase its usefulness as a calibration line for Ge(Li) spectrometers. The observed value, 1460.75 ± 0.06 keV has an uncertainty which is improved by better than an order of magnitude over previous determinations. In addition two gamma rays emitted by natural-occuring thorium have had their energies determined with improved precision: the 727.1 ± 0.1 keV gamma ray emitted by212Bi and the 911.07 ± 0.07 keV gamma ray emitted by228Ac.
References (1)
- RobinsonB.L.
Phys. Rev.
(1964)
Cited by (16)
Nuclear Data Sheets for A=40
2017, Nuclear Data SheetsThe experimental nuclear structure data and decay data are evaluated for the known nuclides of mass 40 (Mg, Al, Si, P, S, Cl, Ar, K, Ca, Sc, Ti). Detailed evaluated nuclear structure information is presented with the best values recommended for level energies, half-lives, γ-ray energies and intensities, decay properties (energies, intensities and placement of radiations), and other spectroscopic data. The 40Ca and 40K nuclides remain as the most extensively studied from many different reactions and decays; no excited states are known in 40Mg, 40Al, 40P and 40Ti. This work supersedes the earlier full evaluation of A=40 by J. Cameron and B. Singh (2004Ca38).
Nuclear data sheets for A = 40
2004, Nuclear Data SheetsNuclear spectroscopic information for the known nuclides of mass 40 (Al,Si,P,S,Cl,Ar,K,Ca,Sc,Ti) has been evaluated. The principal sources of the adopted levels presented are Endt's evaluations (1990En08, 1978En02). The data sets for reactions and decays, including all available gamma-ray data, are based mostly on the original literature. There are no data available for the excited states in 40Al, 40Si, 40P and 40Ti. The identification and particle stability of 40Mg are still uncertain, although search for this nuclide has been made (2002Lu09,2002No11,2003Pe31).
Accurate determination of the gamma-ray energy from naturally occurring <sup>40</sup>K and <sup>138</sup>La
1980, Nuclear Instruments and MethodsEnergies of gamma rays from naturally occurring 40K and 138La were determined with accuracies of 10 eV or better by using a Ge(Li) detector. The results are and 788.742 ± 0.008 and .
Energy levels of A = 21-44 nuclei (VI)
1978, Nuclear Physics, Section AThe experimentally determined properties of the A = 21–44 nuclei are compiled and evaluated, special emphasis being given to nuclear structure.
Separate tables for each of the nuclides reviewed give all available information about the following properties in this order: - excitation energies (Ex),
- •
- γ-ray branching ratios,
- •
- γ-ray mixing ratios (δ),
- •
- lifetimes (τm) or widths (Λ),
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- spin and parity (Jπ) and isospin (T) assignments, and
- •
- any other data, on single-particle transfer, resonance levels, etc.
The “best” (or adopted) values for Ex, τm or Λ, Jπ and T are summarized in a master table.
The review of each A-chain concludes with - a discussion of isospin multiplets,
- •
- a few remarks about the experimental situation, and
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- a compilation of references to relevant theoretical papers.
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Nuclear Data Sheets for A = 228
1976, Nuclear Data SheetsThe experimental data for nuclei in the mass chain A = 228 have been examined, and the results summarized. Where possible, the results are presented in pictorial form. The text contains tables of adopted levels and properties, tables of radiations, comments which point out deficiencies or inconsistencies in the data, and a reference list.
For those cases where only tentative or partial decay schemes are given, the reader is encouraged to contact the compiler for more specific detail.
Structure information is relatively sparse except for the 228Th nucleus. Except where noted, Q—values have been adopted from 74WaBG. Data for the decay of the ground states of the A = 232 isotopes have been taken from 70Sc37 since there has been little modification except for the half—life of 232Pu (see 73Ja06) and alpha decay of 232U (see 71So15 and 72Go33). Data on the alpha decay of A = 228 nuclei have been taken from the compilation for A = 224 (this issue) by Y. A. Ellis. In the drawings, transition intensities per 100 decays of the parent are given.
The compilation has been prepared by computer from data sets entered by the compilers into the Evaluated Nuclear Structure Data File (ENSDF). Corrections or additions to the content of this compilation should be addressed to the compiler for inclusion in the ENSDF.
The γ-decay of a p<inf> 3 2</inf> analogue state in <sup>51</sup>Mn
1974, Nuclear Physics, Section AA high-accuracy investigation of the γ-decay of the Ep = 1059 and 1071 keV resonances in the reaction 50Cr(p, γ)51Mn has been performed. The Ep = 1059 keV resonance is shown to be the analogue state corresponding to the E∗ = 1899 keV,− parent state in 51Cr. From (p, γ) angular distributions, mixing ratios of the primary γ-transitions depopulating this resonance and Jπ values of many states populated in the γ-decay have been determined. The total γ-width of this 1059 keV resonance is found to be Γγ = 0.055 eV. The analogue-anti-analogue transition strength is 0.009 W.u. and fits well into our systematics of IAS → AIAS transitions in f-p shell nuclei. The main part of the M1 strength in the γ-decay of the IAS is absorbed in − and − core polarized states. A comparison of the level scheme of 51Mn obtained from the decay schemes of the (p, γ) resonances with calculations in the Coriolis strong coupling model shows evidence for a g.s. deformation of 51Mn.