Author: Balraj Singh |  Citation: ENSDF |  Cutoff date: 31-MAR-2017 

Authors: Balraj Singh, Ameenah R. Farhan |  Citation: Nucl. Data Sheets 107, 1923 (2006) |  Cutoff date: 30-Apr-2006 

 Full ENSDF file | Adopted Levels (PDF version) 

Q(β-)=9751 keV 7S(n)= 5090 keV 6S(p)= 13187 keV 7Q(α)= -11800 keV SY
Reference: 2017WA10

  A  74Ni β- decay (507.7 MS) 

General Comments:

74Cu identified by thermal neutron fission of 235U: 1987Ar21, 1987LuZX, 1989Wi11, 1990Be13, 1991Kr15, 1992CzZY. 1997Hu09, 2002Kr10, 2002Kr13: 74Cu produced in 238U(p,F) E=30 MeV. Measured yields

1987LuZX: measured T1/2.

1991Kr15: measured T1/2 and neutron-emission probabilities.

1999GrZQ: search for microsecond isomers in Ni(86Kr,X) reaction

2010Fl02, 2010Vi07: measurement of spin, static magnetic and quadrupole moments by collinear laser spectroscopy at the CERN-ISOLDE facility. 74Cu produced in bombardment of uranium carbide target with 1.4 GeV protons. Resonant ionization laser ion source (RILIS) was used to resonantly laser ionize the Cu atoms. The ions were accelerated to 30 keV and mass separated by HRS and injected into radiofrequency quadrupolar (RFQ) gas-filled Paul trap (ISCOOL). Measured hyperfine structure for the ground state from resonance fluorescence spectra; deduced spin, magnetic dipole moment and electric quadrupole moment. The data were normalized to values of hyperfine structure constants, and moments for 65Cu. Comparison with shell-model calculations

2016Bi08: 74Cu isotope was produced by bombarding UCx target with 1.4 GeV proton beam at the CERN-ISOLDE facility. Cu isotopes were selectively ionized by the RILIS laser ion source, accelerated to 30 keV, mass separated with the high-resolution mass separator, and injected into the gas-filled linear Paul trap. Measured isotope shift with respect to 65Cu using the collinear laser spectroscopy setup. Studied systematics of isotope shifts on 58-75Cu isotopes. Compared with droplet model predictions.

No excited states are known from 74Ni β- decay. In the fragmentation of 86Kr beam with a Ni target, 1999GrZQ claimed to have observed short-lived isomer(s) in 74Cu, but no details are available as to the excitation energies.

75Ni decays by β-n to 74Cu with %β-n=10.0 28 (2010Ho12). Other %β-n=1.6 (1985Re01). No details of the level population from this decay are available

In βγ and γγ studies of 74Cu decay, 1998Fr15 reported two most intense γ rays at 166.1 1 and 694.3 2, forming a cascade. These γ rays feed levels either in 74Cu through 74Ni β- decay or in 73Cu through 74Ni β-n decay. The latter possibility, however, seems less likely (1998Fr15) since the γ-ray intensities imply %β-n=30, much higher than the theoretical value of 2.3% (2003Mo09)

Mass measurements: 2005Gu36, 2007Gu09

Q-value: Estimated ΔQ(α)=300 (2017Wa10)

Q-value: S(2n)=12366 6, S(2p)=30390 400 (syst), Q(β-n)=1516 6 (2017Wa10)

XREFJπ(level) T1/2(level)
  0.0A 2- 1.63 s 5 
% β- = 100
% β-n > 0

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Additional Level Data and Comments:

  0.02- 1.63 s 5 
% β- = 100
% β-n > 0
μ=-1.068 3 (2010Fl02,2010Vi07,2014StZZ), Q=+0.27 3 (2010Fl02,2010Vi07,2016St14)
δ<r2>(65Cu,74Cu)=0.505 fm2 18(stat) 72(syst) (2016Bi08). The systematic uncertainty for isotope shift resulted from uncertainties in the atomic factors.

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