[en] The authors continue the literature scan on A = 21-44 nuclei. Data is presented of gamma-ray strengths for the A = 6-20, 21-44 and 45-90 regions. (G.T.H.)

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[en] Progress made in proton-capture γ-ray studies is discussed under four headings. Precision: the recent evaluation of the fundamental constants has direct implications for capture γ-ray work. Completeness: modern detection techniques applied to (p,γ) reactions lead to a completeness of information which is essential in the comparison of experiment and theory, and thus crucial for the progress of nuclear physics. Spin-assignments: the large amount of precise information may be used to assign spins in non-traditional ways. Applications: new techniques, e.g. for the production of variable-energy γ-rays, enlarge the scope of the capture γ-ray field. (author)

[en] The capture reactions are non-selective reactions, which excite practically all the existing unbound states. The most attractive feature is the large number of well-isolated resonances which offer an excellent starting point for decay studies that usually reveal many characteristics of the bound states amenable to theoretical description. The disadvantage of non-selective reaction mechanism is the fact that for many nuclei the resonance density becomes to high for adequate resolution. This is especially the case for heavier nuclei and for light odd-odd final nuclei (high level density). It is possible to excite very few high spin resonances through proton capture. An excellent starting point for the study of high spin bound states provide (alpha, gamma) reactions. The problem of background unavoidable in the case of NaI detectors has been solved by manufacturing of Ge(Li) detectors. The competition of (alpha, p) and for (alpha, n) reactions on odd-A target nuclei eliminates many of the low spin resonances making the narrow high-spin (alpha, gamma) resonances stand out more clearly. The background reaction ¹³C(alpha,n)¹⁶O gives the possibility to produce a sharp mono-energetic high energy gamma line for the energy calibration of gamma-ray spectra. (S.B.)

[en] A consistent set of γ-ray energies, generally with uncertainties of less than 10 ppm, is recommended for use in the energy calibration of γ-ray spectra. The energy scale used for the previously recommended standards (1979) has been modified to take into account subsequent adjustments in the fundamental constants (-7.71 ppm) and in the γ-ray wavelengths deduced from a revised estimate of the lattice spacing of Si crystals (+1.91 ppm). On this revised energy scale, the strong line from ¹⁹⁸Au, the 'gold standard', has an energy of 411 802.05±0.17 eV, which is 2.4 eV (or 5.80 ppm) lower than the 1979 value. A significant improvement has come from the reduction in the uncertainty in the wavelength-to-keV conversion factor from 2.6 to 0.3 ppm. The criteria for the selection of γ rays to include are described. The list of γ-ray energies recommended for calibration, especially for Ge semiconductor detectors, has values for about 260 γ-rays from 50 radionuclides ranging from 24 to 4806 keV. Also, γ-ray energies are also given for about 70 additional lines, including 5 other radionuclides

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[en] The recommended upper limit (RUL) for isospin-allowed M2 γ-ray transition strengths is largely determined by the strongest observed M2 transitions. In order to check this M2 RUL the strengths of the five strongest reported primary M2 transitions have been remeasured via (p,γ) reactions. The results are: ¹⁴N, E_x = 8.91→0 MeV: 2.2±0.3 W.u.; ¹⁶O, E_x = 12.97→0 MeV: 1.0±0.3 W.u.; ¹⁶O, E_x = 12.53→0 MeV: 1.12±0.17 W.u.; ²¹Na, E_x = 2.80→0.33 MeV: <0.4 W.u.; ³²S, E_x = 10.08→0 MeV: 0.93±0.13 W.u.. Although all but one of these new M2 strengths are lower than the previously reported values, the M2 RUL of 3 W.u. for nuclei with A = 6-44 cannot be reduced due to the strong transition in ¹⁴N. (orig.)

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