Averaged intensities of primary gamma rays after keV neutron capture in copper
Abstract
The averaged intensities of high-energy gamma rays in copper have been measured with a Ge(Li) detector after the capture of 10–60 keV neutrons. The capture spectra represent the average strengths of transitions from a large number of resonances. They bear no relation to the thermal result, thus supporting the view that the latter proceeds through a non-compound nucleus mechanism. The ground state transition does not dominate the keV capture spectrum and the intensities indicate the presence of an Eγ3 energy dependence.
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Cited by (12)
Nuclear Data Sheets for A=64
2021, Nuclear Data SheetsThe evaluated experimental data are presented and evaluated for 13 known nuclides of mass 64 (Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Se). For each nuclide, the best values combining all available data are recommended for spectroscopic properties. No excited states have been identified in 64Ti, 64As, and 64Se. Only one excited state in 64V as an isomer, and three in 64Cr have been identified. Data for excited states in 64Mn, 64Fe, and 64Co remain limited. 64Ni, 64Cu, and 64Zn are the most studied nuclides through various reactions and decays, followed by 64Ga and 64Ge. In the opinion of the evaluators, there are several incomplete or discrepant aspects of the high-spin portion of the level scheme for 64Zn above ≈5 MeV excitation which need to be resolved in further experiments using large γ-detector arrays. The decay schemes of 64Ti β−, 64As ε and 64Se ε are unknown, while very little information is available for 64V β− and 64Cr β−. The decay schemes of 64Mn β−, 64Fe β−, 64Co β− and 64Ge ε are somewhat better known, but still considered incomplete by evaluators. The decay scheme of 64Ga ε decay is known in detail, however there is the possibility of additional levels populated above 4713 keV, as the Q(ε) value is 7171 keV. The β−, β+ and ε decay modes of 64Cu are well known, as this radionuclide is of great importance in applications, for example, as a dosimeter for neutron flux determination in nuclear reactors, and as a radiopharmaceutical for positron emission tomography (PET). This work supersedes earlier full evaluations of A=64 by 2007Si04, 1996Si12, 1991Si03, 1979Ha35 and 1974Au04.
Nuclear Data Sheets for A = 64
2007, Nuclear Data SheetsThe evaluated spectroscopic data are presented for known nuclides of mass 64 (V,Cr,Mn,Fe,Co,Ni,Cu,Zn,Ga,Ge,As,Se). Excited-state data are nonexistent for 64V, 64Cr, 64As and 64Se. Except for half-lives, no other radioactive decay data are available for the decay of 64V, 64As and 64Se; and those for the decays of 64Cr, 64Mn, 64Fe, 64Co and 64Ge are not considered as definitive. There are several high-spin studies for 64Zn nuclide, but many inconsistencies are noted in this evaluation and complete details of data in these studies are generally lacking in the published literature. This work supersedes earlier full evaluations of A = 64 by 1996Si12, 1979Ha35, 1974Au04 and 1967Ve09; and a mid-strem evaluation by 1991Si03 published in an 'update' mode.
Nuclear Data Sheets for A = 64
1996, Nuclear Data SheetsAbstract:The evaluated spectroscopic data are presented for known nuclides of mass 64 (Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge). Excited-state data are nonexistent for64Mn and64Fe. Radioactive decay data for64Mn are not available and those for64Fe,64Co and64Ge are not considered definitive.
The following nuclides have not yet been identified but, amongst other nuclides, have been included in theoretical calculations:64Ca (92Ma60,91To03,91Hi10);64Cr (95Re20,95Ri05,95Au04);64As (95Au04);64Se (93Sh11).
The literature available up to June 25, 1996 has been consulted. This work supersedes earlier evaluations of A=64 published in Nuclear Data Sheets (91Si03,79Ha35,74Au04,67Ve09).
Cutoff Date:Literature available up to June 25, 1996 has been consulted.
General Policies and Organization of Material:See the January issue of Nuclear Data Sheets.
Acknowledgments:The evaluator thanks Alfredo Galindo-Uribarri at Chalk River for discussions and communicating results of his recent in-beam experiment on64Zn, prior to publication.
General Comments:The statistical analysis of γ-ray data and deduced level schemes is carried out through computer codes available at Isotopes Project, Berkeley and Nuclear Data Center, Brookhaven. The methodology and procedures for some of these codes are described by 86BrZQ and 86Br21. A general 3% uncertainty is assumed in quoted theoretical internal conversion coefficients taken mainly from 68Ha53.
The values of μ and Q are from compilation by 89Ra17, when available.
Nuclear data sheets update for A = 108
1991, Nuclear Data SheetsThe 1982 evaluation of A=108 (82Ha61) has been revised. New Level schemes were obtained for 108In, 108Sn.
Nuclear data sheets for A = 64
1974, Nuclear Data SheetsNuclear structure data available through December 1973 are compiled, and adopted level properties are presented. The present compilation represents an update of the previous work by H. Verheul (Nuclear Data B2-3-65, 1967). Where possible, the data are presented in comparative level diagrams, thereby eliminating many tabular listings. Also, where no additional data have appeared since the previous compilation, only the values adopted in the latter are presented here. These modifications have resulted in a substantial reduction in the size of the compilation, hopefully without unduly sacrificing its utility.
A study of the Cu(n, γ) reaction
1973, Nuclear Physics, Section AThe circular polarization of γ-rays from capture of polarized thermal neutrons in natural Cu has been measured. The analysis of 16 primary transitions yields unique spin assignments for two 64Cu levels and limits the possible spin values for eight other 64Cu levels and three 66Cu levels. No correlation between the (d, p) strength and the (n,γ) reduced transition strengths has been found.