Author: Balraj Singh |  Citation: ENSDF |  Cutoff date: 30-SEP-2020 

Authors: Balraj Singh, Ninel Nica |  Citation: Nucl. Data Sheets 113, 1115 (2012) |  Cutoff date: 30-Mar-2012 

 Full ENSDF file | Adopted Levels (PDF version) 

Q(β-)=12063 keV SYS(n)= 3240 keV SYS(p)= 19580 keV SYQ(α)= -16330 keV SY
Reference: 2017WA10,2017We16

General Comments:

1995En07: 77Ni nucleus identified by thermal neutron fission of 235U followed by mass separation. α total of about 13 events were assigned to 77Ni.

1997Be12, 1997Be70: 77Ni observed in (238U,X) on Pb and Be targets at E(238U)=750 MeV/nucleon followed by fragment separation

2005Ho08 (also 2007Sc29,2004St28,2005Sc28): 9Be(86Kr,X) E=140 MeV/nucleon; fully-ionized 86Kr beam, A1900 fragment separator at NSCL facility. Detected β particles correlated with implanted nuclei in Si detectors. Measured yield and half-life of 77Ni

2014Xu07: 77Ni nuclide produced in 9Be(238U,F) reaction with a 238U86+ beam of 345 MeV/nucleon produced by the RIKEN accelerator complex. Identification of 77Ni nuclei was made on the basis of magnetic rigidity, time-of-flight and energy loss of the fragments (ΔE-Bρ-tof method) using BigRIPS fragment separator and and ZeroDegree Spectrometer (ZDS) at RIBF-RIKEN facility. Based on α/Q spectrum and Z versus α/Q plot. Measured heavy fragment, β and γ spectra using wide-range active silicon strip stopper array (WAS3ABi) for β and ion detection, and EUROBALL-RIKEN Cluster array for γ detection. Decay curves were obtained from time differences between implantation and correlated β decays. See also 2014XuZZ thesis

2017Sa32, 2016Sa07: decay of 77Ni to 77Cu studies at RIBF-RIKEN facility

Theoretical calculations: consult the NSR database at for 21 primary theory references dealing with nuclear structure calculations, and radioactive decays.

Q-value: Q(β-)=12063 500 from mass excess (77Ni)=-36800 500 (syst, 2017Wa10) and measured mass excess (77Cu)=-48862.8 12 (2017We16). S(n), S(p) and Q(α) are from 2017Wa10

Q-value: Estimated uncertainties: 500 for Q(β-) (2017Wa10, 2017We16), 640 for S(n) (2017Wa10), 780 (2017Wa10) for S(p), and 710 for Q(α) (2017Wa10)

Q-value: Q(β-n)=6110 500, S(2n)=8910 580, S(2p)=37740 780 (syst, 2017Wa10). Q(β-2n)=1529 500 deduced by evaluator from relevant mass excesses in 2017Wa10. The Q((β-n)) and Q(β-2n) values are nearly the same when measured mass excesses of 76Cu and 75Cu from 2017We16 are considered.

Jπ(level) T1/2(level)
  0 (9/2+) 158.9 ms 42 
% β- = 100
% β-n = 26 16
% β-2n = ?

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Additional Level Data and Comments:

  0(9/2+) 158.9 ms 42 
% β- = 100
% β-n = 26 16
% β-2n = ?
Theoretical T1/2=257.7 ms, %β-n=23, %β-2n=0 (2019Mo01).
E(level): Theoretical T1/2=257.7 ms, %β-n=23, %β-2n=0 (2019Mo01).

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