ADOPTED LEVELS, GAMMAS for 74Ga

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-)=5372.8 keV 30S(n)= 6422 keV 3S(p)= 9745 keV 4Q(α)= -7498 keV 3
Reference: 2017WA10

References:
  A  74Zn β- decay (95.6 S)  B  74Ga IT decay (9.5 S)

General Comments:

74Ga produced and identified by 1956Mo39 in bombardment of natural Ge target with fast neutrons and subsequent measurement of γ radiation from the decay of 74Ga. Later measurements of half-life, γ and β radiation from the decay of 74Ga ground state: 1958Le26, 1958Ei02, 1959Yt23, 1960Ma12, 1962Ei02, 1967Vi08, 1971Ca06, 1972Er05, 1975Ta03.

2011Ma45: 74Ga was produced by neutron induced fission of a thick uranium carbide target. Neutrons were produced by 1.4 GeV protons on tantalum. Ga isotopes were ionized using RILIS laser ion source. Laser spectroscopy was performed on the Ga isotopes at ISOLDE, CERN. The g.s spins and moments were extracted from measured hyperfine spectra. Comparison with shell model calculations.

2012Pr11: 74Ga produced in 1.4 GeV-proton bombardment of UCx at ISOLDE-CERN facility. Fragments diffused out of target and surface ionized, then accelerated to 30 keV, followed by mass separation and bunched by gas-filled Paul Trap (ISCOOL). Isotope shifts were measured by collinear laser spectroscopy using COLLAPS setup at ISOLDE-CERN. Deduced rms charge radius.

Mass measurements: 2015Ma30, 2011Et01, 2007Gu09, 2007Ke09, 2005Gu36

Nuclear structure (theory) references: 2012Sr01

Q-value: S(2n)=15604 3, S(2p)=22845 3 (2017Wa10)










E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
     0.0AB (3-) 8.12 m 12 
% β- = 100
     
    56.550 9 AB (2-) 31 ns 5 
% IT ≈ 100
    56.559 10 
  100
(M1(+E2))
     0.0
(3-)
    59.571 14 AB (0+) 9.5 s 10 
% IT = 75 25
% β- = 25 25
     3.2 2 
    59.7S
 
 
[M2]
[E3]
    56.550
     0.0
(2-)
(3-)
   102.276 14 A        45.746 17 
   102.25 3 
   84 6 
  100 8 
[D]
[D,Q]
    56.550
     0.0
(2-)
(3-)
   108.654 12 A  (1+)       49.087 10 
    52.110 14 
   108.635 20 
  100 2 
   32 11 
    1.3 11 
[D]
[D]
[M2]
    59.571
    56.550
     0.0
(0+)
(2-)
(3-)
   141.334 15 A  (1-,2,3+)       84.81 3 
   141.330 21 
   14 2 
  100 8 
[D]
[D,Q]
    56.550
     0.0
(2-)
(3-)
   145.032 18 A        85.1 4 ?
    88.496 24 
   145.02 4 
   56 11 
  100 9 
   29 2 
[D]
[D]

    59.571
    56.550
     0.0
(0+)
(2-)
(3-)
   227.803 12 A  (0,1,2,3+)      119.149 2 
   125.54 3 
   168.22 6 
   171.13 7 
  100 8 
   21 4 
   13 4 
    6 2 
[D,Q]



   108.654
   102.276
    59.571
    56.550
(1+)

(0+)
(2-)
   251.787 14 A  (1+)      106.762 22 
   110.461 24 
   143.137 24 
   149.517 24 
   192.212 19 
   195.19 4 
   251.89 5 ?
    3.7 6 
    2.6 2 
  100 3 
    7.4 4 
   71 2 
   11 1 
    2 1 
[D,Q]

[D,Q]




   145.032
   141.334
   108.654
   102.276
    59.571
    56.550
     0.0

(1-,2,3+)
(1+)

(0+)
(2-)
(3-)
   455.06 5 A  (1+)      346.46 5 
   395.16 13 
   398.30 25 
  100 5 
   17 2 
    9 2 



   108.654
    59.571
    56.550
(1+)
(0+)
(2-)
E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
   894.11 5 A  (1+)      438.83 17 
   642.9 3 
   666.21 10 
   749.2 3 
   752.82 7 
   785.44 12 
   792.01 16 
   837.49 11 
   894.10 3 ?
   17 3 
   12 3 
   70 8 
   11 3 
  100 7 
   30 3 
   25 3 
   48 3 
   14 3 









   455.06
   251.787
   227.803
   145.032
   141.334
   108.654
   102.276
    56.550
     0.0
(1+)
(1+)
(0,1,2,3+)

(1-,2,3+)
(1+)

(2-)
(3-)
  1085.72 9 A  (1+)      630.72 12 
   834.00 24 
   977.07 24 
   983.7 3 
  1025.81 23 
  1028.7 4 
   80 15 
  100 24 
   78 15 
   72 17 
   89 15 
   63 15 






   455.06
   251.787
   108.654
   102.276
    59.571
    56.550
(1+)
(1+)
(1+)

(0+)
(2-)

M(γ): Non-observation of strong K x-rays of Ga suggests dipole multipolarity for low-energy transitions (less than ≈100 keV)

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Additional Gamma Data:















E(level)
(keV)		Jπ(level)T1/2(level)E(γ)
(keV)		MultipolarityMixing
Ratio		Conversion
Coefficient		Additional Data
    56.550 (2-) 31 ns 5 
% IT ≈ 100
    56.559 10 (M1(+E2))0.17 LT0.42B(M1)(W.u.)=0.0029 5, α=0.42 8
    59.571 (0+) 9.5 s 10 
% IT = 75 25
% β- = 25 25
     3.2 2 [M2] 2.9×105α=2.9×105 11
(0+) 9.5 s 10 
% IT = 75 25
% β- = 25 25
    59.7[E3] 71α=71 6
   102.276       45.746 17 [D] 0.64α=0.64 2
     102.25 3 [D,Q] 0.35α=0.35 29
   108.654 (1+)       49.087 10 [D] 0.523α=0.523 17
(1+)       52.110 14 [D] 0.440α=0.440 13
(1+)      108.635 20 [M2] 0.546α=0.546
   141.334 (1-,2,3+)       84.81 3 [D] 0.108α=0.108 2
(1-,2,3+)      141.330 21 [D,Q] 0.11α=0.11 8
   145.032       85.1 4 [D] 0.106α=0.106 2
      88.496 24 [D] 0.095α=0.095 2
   227.803 (0,1,2,3+)      119.149 2 [D,Q] 0.20α=0.20 16
   251.787 (1+)      106.762 22 [D,Q] 0.30α=0.30 25
(1+)      143.137 24 [D,Q] 0.10α=0.10 8

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0.0(3-) 8.12 m 12 
% β- = 100
μ=0.000 75 (2011Ma45,2014StZZ), Q=+0.549 40 (2011Ma45,2016St14)
Isotope shift δν(71Ga,74Ga)=-32 MHz 2(stat) 6(syst) (2012Pr11).
    59.571(0+) 9.5 s 10 
% IT = 75 25
% β- = 25 25
No β- branch observed (1974Va08). An upper limit is suggested as 50% (1974Va08).
   108.654(1+)   Jπ(level): Indication of strong (>2%) β feeding (probable allowed transition) from 0+ parent, although absolute β feedings are unknown.
   251.787(1+)   Jπ(level): Indication of strong (>2%) β feeding (probable allowed transition) from 0+ parent, although absolute β feedings are unknown.
   455.06(1+)   Jπ(level): Indication of strong (>2%) β feeding (probable allowed transition) from 0+ parent, although absolute β feedings are unknown.
   894.11(1+)   Jπ(level): Indication of strong (>2%) β feeding (probable allowed transition) from 0+ parent, although absolute β feedings are unknown.
  1085.72(1+)   Jπ(level): Indication of strong (>2%) β feeding (probable allowed transition) from 0+ parent, although absolute β feedings are unknown.

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Additional Gamma Comments:

E(level)E(gamma)Comments
    56.550    56.559M(γ): from α(K)exp in 74Ga IT decay and nonobservation of K x-rays, ΔJπ suggests M1
    59.571     3.2E(γ): from difference of sum peak at 59.7 and 56.7γ. This transition is expected to be almost totally converted

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