The gamma-ray spectroscopy of 64Cu
Abstract
The γ-ray angular distributions, linear polarization angular distributions and γ-γ angular correlations have been measured for transitions observed following the 64Ni(p, n)64Cu reaction. Comparison of the data with the predictions of the compound nuclear statistical model yielded the following unique Jπ assignments for levels in 64Cu: 159 keV (2), 278 keV (2+), 344 keV (1+), 362 keV (3), 609 keV (2), 663 keV (l), 746 keV (3), 878 keV (0), and 895 keV (3). For the remaining levels below Ex = 1 MeV, probable assignments of 574 keV (4), 739 keV (2, 3) and 927 keV (1) were deduced. Multipole mixing ratios were obtained for most of the transitions connecting these levels.
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Cited by (10)
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.
Coulomb excitation with radioactive nuclear beam of <sup>64</sup>Cu
2003, Nuclear Physics AThe radioactive nuclear beam of 64Cu was obtained utilizing a two-stage method at the HI-13 tandem accelerator of China Institute of Atomic Energy. The B(E2) value of the first excitation state of 64Cu has been directly measured for the first time by Coulomb excitation method, using the radioactive nuclear beam of 64Cu. An upper limit of the B(E2;21+→1gs+) value from the first excitation state to the ground state of 64Cu is determined to be 49 W.u., which is significantly smaller than 250±170 W.u., the value adopted by Nuclear Data Sheets. The reliability of the experimental method was verified by simultaneously performing the Coulomb excitation experiment of 181Ta.
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 = 64
1991, Nuclear Data SheetsThe evaluated spectroscopic data are presented for eight known nuclides of mass 64 (Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge). Excited-state data are nonexistent for 64Mn and 64Fe. Very little information is available for 64Ge and γ-ray data are scarce for 64Co and 64Ni. Some high-spin data are available for 64Ga and 64Ge, in spite of several in-beam γ-ray experiments on 64Zn and 64Cu. Further work on 64Zn and 64Ga seems to be in progress at Daresbury (90LiZS) through heavy-ion reactions. Radioactive decay data for 64Mn are not available and those for 64Fe, 64Co and 64Ge are not considered definitive.
Study of the <sup>63</sup>Cu(n, γ)<sup>64</sup>Cu reaction
1983, Nuclear Physics, Section AThe γ-radiation resulting from the capture of unpolarized thermal, 2 and 24 keV neutrons in enriched 63Cu, and of polarized thermal neutrons in 63Cu oriented at low temperature has been investigated. Of the 323 γ-rays observed 299 could be placed in a 64Cu level scheme containing 109 levels. The reaction Q-value amounts to 7916.09(12) keV. The χ2 analysis of the γ-ray angular distributions obtained from capture of polarized neutrons in oriented 63Cu resulted in three unambiguous spin assignments for levels in 64Cu. The fraction of the Jπ = 1− channel in the thermal capture was determined as (94 ± 2)%. For one level an unambiguous spin assignment has been obtained from the decay scheme.