ADOPTED LEVELS, GAMMAS for 77Ga
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-)=5220.5 keV 24 | S(n)= 7767 keV 3 | S(p)= 10978.3 keV 28 | Q(α)= -9430 keV 3 | ||
| Reference: 2017WA10 |
| References: | |||
| A | 77Zn β- decay (2.08 S) | B | 77Zn β- decay (1.05 S) |
| C | 238U(76Ge,xγ) | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 0.0 | A C | 3/2(-) | 13.2 s 2 % β- = 100 | |||||
| 105.66 4 | A | (1/2-) | < 4 ns | 105.66 5 | 100 | (M1) | 0.0 | 3/2(-) |
| 160.95 3 | A | (3/2-) | < 2 ns | 55.1 2 160.93 5 | 23.3 10 100 10 | (M1) | 105.66 0.0 | (1/2-) 3/2(-) |
| 189.49 3 | A C | (5/2-) | < 2 ns | 189.49 4 | 100 | (M1) | 0.0 | 3/2(-) |
| 474.064 25 | A C | (5/2-) | 284.56 5 313.12 6 368.44 5 473.94 5 | 9.0 9 12.0 9 20.6 7 100 10 | 189.49 160.95 105.66 0.0 | (5/2-) (3/2-) (1/2-) 3/2(-) | ||
| 626.41 3 | A C | (7/2-) | 152.43 6 436.80 8 465.5 2 626.40 5 | 75 7 58 5 65 5 100 10 | [D,E2] | 474.064 189.49 160.95 0.0 | (5/2-) (5/2-) (3/2-) 3/2(-) | |
| 873.35 3 | A | (7/2-) | 246.90 5 399.16 5 684.0 1 712.41 5 873.44 5 | 12.8 20 72 8 26.4 16 10.0 16 100 12 | 626.41 474.064 189.49 160.95 0.0 | (7/2-) (5/2-) (5/2-) (3/2-) 3/2(-) | ||
| 1116.33 4 | A C | (9/2-) | 489.7 2 926.84 5 1116.6 3 | 3.7 18 100 11 2.6 4 | [M3] | 626.41 189.49 0.0 | (7/2-) (5/2-) 3/2(-) | |
| 1233.97 5 | A | (3/2-,5/2-) | 759.82 6 1128.34 9 1234.1 1 | 24 3 27 3 100 6 | 474.064 105.66 0.0 | (5/2-) (1/2-) 3/2(-) | ||
| 1282.38 5 | A | (7/2-,9/2-) | 408.5 2 ? 808.29 5 1093.1 1 | 14.3 14 100 14 25.0 21 | 873.35 474.064 189.49 | (7/2-) (5/2-) (5/2-) | ||
| 1403.19 8 | A | 1242.1 1 1403.3 1 | 20 10 100 10 | 160.95 0.0 | (3/2-) 3/2(-) | |||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 1477.33 6 | A C | (11/2-) | 195.0 2 361.1 2 850.89 7 | 10 3 21 3 100 8 | 1282.38 1116.33 626.41 | (7/2-,9/2-) (9/2-) (7/2-) | ||
| 1515.89 6 | A | 1041.81 5 1326.8 4 | 100 8 24 3 | 474.064 189.49 | (5/2-) (5/2-) | |||
| 1797.11 21 | A | 1607.6 2 | 100 | 189.49 | (5/2-) | |||
| 1831.99 4 | A | (+) | 597.8 3 1357.90 5 1832.0 2 | 16.1 16 43 3 100 7 | 1233.97 474.064 0.0 | (3/2-,5/2-) (5/2-) 3/2(-) | ||
| 1857.85 6 | A | 1751.60 7 1857.82 7 | 100 8 56 6 | 105.66 0.0 | (1/2-) 3/2(-) | |||
| 1872.55 4 | A | 756.17 5 999.22 4 | 65 13 100 8 | 1116.33 873.35 | (9/2-) (7/2-) | |||
| 1970.01 4 | A C | (11/2-) | 688.0 1 853.70 6 1096.61 5 1343.9 5 | 9 4 63 19 100 6 19.4 19 | 1282.38 1116.33 873.35 626.41 | (7/2-,9/2-) (9/2-) (7/2-) (7/2-) | ||
| 2028.29 5 | A | 196.8 2 1154.86 5 1401.5 6 1554.55 7 1838.75 8 | 8.4 21 48 3 18.9 21 28 4 100 4 | 1831.99 873.35 626.41 474.064 189.49 | (+) (7/2-) (7/2-) (5/2-) (5/2-) | |||
| 2028.81 7 | A C | (9/2+) | 4.4 ns 8 | 551.47 5 746.6 4 912.0 10 | 100 5 8.3 21 23 5 | [E1] [E1] [E1] | 1477.33 1282.38 1116.33 | (11/2-) (7/2-,9/2-) (9/2-) |
| 2138.03 4 | A | (+) | 168.09 5 305.94 5 855.7 6 1021.6 5 1264.60 5 1511.73 7 1663.93 7 | 6.2 14 100 10 38 14 2.4 9 71 5 30 3 71 5 | 1970.01 1831.99 1282.38 1116.33 873.35 626.41 474.064 | (11/2-) (+) (7/2-,9/2-) (9/2-) (7/2-) (7/2-) (5/2-) | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 2149.31 6 | A | 291.42 5 1988.7 1 | 100 10 40 4 | 1857.85 160.95 | (3/2-) | |||
| 2207.14 21 | C | (13/2-) | 1090.8 2 | 100 | 1116.33 | (9/2-) | ||
| 2327.5 8 | A | 357.5 8 | 100 | 1970.01 | (11/2-) | |||
| 2348.52 5 | A | 378.48 5 516.57 6 | 23 3 100 8 | 1970.01 1831.99 | (11/2-) (+) | |||
| 2357.15 5 | A | 219.07 5 387.0 1 1483.96 7 | 82 8 22 6 100 6 | 2138.03 1970.01 873.35 | (+) (11/2-) (7/2-) | |||
| 2385.01 6 | A | 235.68 5 1269.0 2 1758.8 2 2195.43 8 | 39 8 29 5 100 11 79 8 | 2149.31 1116.33 626.41 189.49 | (9/2-) (7/2-) (5/2-) | |||
| 2425.68 5 | A | 2264.74 7 2425.64 7 | 100 10 100 10 | 160.95 0.0 | (3/2-) 3/2(-) | |||
| 2620.91 22 | C | (13/2+) | 592.1 2 | 100 | 2028.81 | (9/2+) | ||
| 2698.77 5 | A | (+) | 560.74 5 669.95 10 670.46 10 | 100 5 66 22 66 22 | 2138.03 2028.81 2028.29 | (+) (9/2+) | ||
| 2805.72 6 | A | (+) | 667.7 1 835.70 5 | 35 12 100 12 | 2138.03 1970.01 | (+) (11/2-) | ||
| 2828.59 21 | A | 800.3 2 | 100 | 2028.29 | ||||
| 2861.8 3 | A | 2672.3 3 | 100 | 189.49 | (5/2-) | |||
| 3217.7 3 | C | (17/2-) | 1010.6 2 | 100 | 2207.14 | (13/2-) | ||
| 3242.97 12 | A | 1385.1 1 | 100 | 1857.85 | ||||
| 3267.63 5 | A | (+) | 842.00 9 919.0 10 1436.0 1 2793.6 1 3106.4 1 ? 3267.5 1 | 100 10 68 15 51 7 49 7 154 15 61 7 | 2425.68 2348.52 1831.99 474.064 160.95 0.0 | (+) (5/2-) (3/2-) 3/2(-) | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 3529.92 16 | A | 1560.4 4 3056.3 3 3340.0 2 | 57 10 100 10 52 14 | 1970.01 474.064 189.49 | (11/2-) (5/2-) (5/2-) | |||
| 3945.89 21 | A | 3756.3 2 | 100 | 189.49 | (5/2-) | |||
E(level): From least-squares fit to Eγ data. Reduced χ2=2.0 with increased uncertainties for five γ-ray energies
Jπ(level): log ft values for levels above 200 keV restrict Jπ to 5/2, 7/2 or 9/2, assuming Jπ=7/2 for 77Zn g.s. Jπ=9/2 is not likely for the levels that decay to g.s. with Jπ=3/2(-). For high-spin (J>9/2) states, tentative assignments are based on shell-model predictions and comparisons of band structures in neighboring odd α Ga nuclides
T1/2(level): For excited levels, values are from γγ(t) in 77Zn β- decay (2.08 s)
M(γ): From ce data
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
| Band 1 - γ cascade based on 3/2(-) | |||||||
| 0.0 | 3/2(-) | 13.2 s 2 % β- = 100 | |||||
| 626.41 3 | (7/2-) | 152.43 6 436.80 8 465.5 2 626.40 5 | 75 7 58 5 65 5 100 10 | [D,E2] | 474.064 189.49 160.95 0.0 | (5/2-) (5/2-) (3/2-) 3/2(-) | |
| 1477.33 6 | (11/2-) | 195.0 2 361.1 2 850.89 7 | 10 3 21 3 100 8 | 1282.38 1116.33 626.41 | (7/2-,9/2-) (9/2-) (7/2-) | ||
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
| Band 2 - γ cascade based on (5/2-) | |||||||
| 189.49 3 | (5/2-) | < 2 ns | |||||
| 1116.33 4 | (9/2-) | 489.7 2 926.84 5 1116.6 3 | 3.7 18 100 11 2.6 4 | [M3] | 626.41 189.49 0.0 | (7/2-) (5/2-) 3/2(-) | |
| 2207.14 21 | (13/2-) | 1090.8 2 | 100 | 1116.33 | (9/2-) | ||
| 3217.7 3 | (17/2-) | 1010.6 2 | 100 | 2207.14 | (13/2-) | ||
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Conversion Coefficient | Additional Data |
| 105.66 | (1/2-) | < 4 ns | 105.66 5 | (M1) | 0.0602 | B(M1)(W.u.)>0.0044, α=0.0602, α(K)=0.0536 8, α(L)=0.00568 8, α(M)=0.000830 12, α(N)=4.41×10-5 7 |
| 160.95 | (3/2-) | < 2 ns | 55.1 2 | (M1) | 0.364 | B(M1)(W.u.)>0.011, α=0.364 7, α(K)=0.324 6, α(L)=0.0348 6, α(M)=0.00510 9, α(N)=0.000268 5 |
| 189.49 | (5/2-) | < 2 ns | 189.49 4 | (M1) | 0.01298 | B(M1)(W.u.)>0.0016, α=0.01298, α(K)=0.01159 17, α(L)=0.001206 17, α(M)=0.0001766 25, α(N)=9.45×10-6 14 |
| 626.41 | (7/2-) | 152.43 6 | [D,E2] | 0.08 | α=0.08 6 | |
| 2028.81 | (9/2+) | 4.4 ns 8 | 551.47 5 | [E1] | B(E1)(W.u.)=3.9E-7 8 | |
| (9/2+) | 4.4 ns 8 | 746.6 4 | [E1] | B(E1)(W.u.)=1.3E-8 4 | ||
| (9/2+) | 4.4 ns 8 | 912.0 10 | [E1] | B(E1)(W.u.)=2.0E-8 6 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | 3/2(-) | 13.2 s 2 % β- = 100 | μ=+2.018 3 (2010Ch16,2019StZV), Q=-0.208 13 (2010Ch16,2016St14) Measured isotope shift δν(71Ga,77Ga)=-109.4 MHz 15(stat) 110(syst) (2012Pr11). |
| 105.66 | (1/2-) | < 4 ns | Jπ(level): From comparison to neighboring odd α nuclides (1986Ek01). Parity from γ ray multipolarities. |
| 160.95 | (3/2-) | < 2 ns | Jπ(level): From comparison to neighboring odd α nuclides (1986Ek01). Parity from γ ray multipolarities. |
| 189.49 | (5/2-) | < 2 ns | Jπ(level): From comparison to neighboring odd α nuclides (1986Ek01). Parity from γ ray multipolarities. |
| 1831.99 | (+) | E(level): Uncertainty of Eγ tripled to get an acceptable fit. Jπ(level): Possible allowed β transition from log ft=5.2 to 5.5 from (7/2+). | |
| 2028.81 | (9/2+) | 4.4 ns 8 | E(level): Uncertainty of Eγ doubled to get an acceptable fit. Jπ(level): No gammas to low-spin states (|<5/2) from this isomer. 1986Ek01 assign 9/2+ on the basis of systematics of neighboring nuclides. |
| 2138.03 | (+) | E(level): Uncertainty of Eγ tripled to get an acceptable fit. Jπ(level): Possible allowed β transition from log ft=5.2 to 5.5 from (7/2+). | |
| 2698.77 | (+) | E(level): Uncertainty of Eγ tripled to get an acceptable fit. Jπ(level): Possible allowed β transition from log ft=5.2 to 5.5 from (7/2+). | |
| 2805.72 | (+) | E(level): Uncertainty of Eγ tripled to get an acceptable fit. Jπ(level): Possible allowed β transition from log ft=5.2 to 5.5 from (7/2+). | |
| 3267.63 | (+) | E(level): Uncertainty of Eγ tripled to get an acceptable fit. Jπ(level): Possible allowed β transition from log ft=5.2 to 5.5 from (7/2+). |
| E(level) | E(gamma) | Comments |
| 626.41 | 152.43 | I(γ): other: 29 3 in 238U(76Ge,Xγ) |
| 873.35 | 399.16 | E(γ): level-energy difference=399.29. Somewhat poor energy fit |
| 1282.38 | 408.5 | E(γ): Placement suggested by the evaluators, based on reported γγ data of 1986Ek01 |
| 1477.33 | 361.1 | I(γ): 37 4 in 238U(76Ge,Xγ) |
| 1857.85 | 1751.60 | E(γ): level-energy difference=1752.17. Somewhat poor energy fit. Uncertainty of Eγ tripled to get an acceptable fit |
| 1970.01 | 688.0 | E(γ): level-energy difference=687.7. Somewhat poor energy fit. Uncertainty of Eγ doubled to get an acceptable fit |
| 2028.29 | 196.8 | E(γ): level-energy difference=196.3. Somewhat poor energy fit | 1554.55 | E(γ): level-energy difference=1554.21. Somewhat poor energy fit. Uncertainty of Eγ doubled to get an acceptable fit |
| 2028.81 | 912.0 | I(γ): 34 5 in 238U(76Ge,Xγ) |
| 2149.31 | 1988.7 | E(γ): Uncertainty of Eγ doubled to get an acceptable fit |
| 3267.63 | 1436.0 | E(γ): Uncertainty of Eγ doubled to get an acceptable fit | 3106.4 | E(γ): Placement suggested by the evaluators, based on reported γγ data of 1986Ek01 |
1968Wi11: 77Ga isotope identified and produced in 235U(n,F), and subsequent counting of γ spectra.
2010Ch16: measurement of spin and static magnetic and quadrupole moment of g.s. E(p)=1.4 GeV; target=UCx. Measured optical hyperfine spectra ISOLDE, CERN using collinear laser spectroscopy. Deduced spin, magnetic moment and quadrupole moment. Comparison with shell-model calculations.
2012Pr11: E(p)=1.4 GeV incident on UCx target 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 and isotope shift.
2019Hu15: measured mass excess=-65995.0 keV 42, as compared to -65992.3 keV 24 in 2017Wa10
Theoretical calculations: consult the NSR database at www.nndc.bnl.gov for five primary theory references dealing with nuclear structure calculations.
Q-value: S(2n)=13670 3, S(2p)=26099 3 (2017Wa10)
Q-value: Measured mass excess for 77Ga=-65995.0 keV 42 (2019Hu15), as compared to -65992.3 keV 24 in 2017Wa10 leads to Q(β-)=5217.9 keV 42