7Be

β+ Decay Evaluated Data

Measurements for Half-Life Time
1940HI01: 7Be.
1949SE20: 7Be.
1953KR16: 7Be.
1956BO36: 7Be.
1957WR37: 7Be; T1/2.
1965EN01: 7Be; T1/2.
1970JO21: 7Be; T1/2 in chemical compounds.
1974CR05: 7Be; T1/2.
1975LA16: 7Be; T1/2.
1982CHZF: 7Be.
1982RUZV: 7Be; T1/2, γ-emission probability data.
1996JA10: 7Be(EC); measured Eγ, Iγ, T1/2.
1999HU20: 7Be(EC); measured Eγ, Iγ, T1/2.
1999RA12: 7Be(EC); measured T1/2 for source implanted in various materials.
2000HU20: 7Be(EC); measured Eγ, Iγ(t), T1/2.
2000LI21: 7Be(EC); measured T1/2; deduced dependence on pressure.
2001NO10: 7Be(EC); measured Eγ, Iγ, T1/2 for sources implanted in various materials; deduced environmental effects.
2003LI22: 7Be(EC); measured T1/2 for source implanted in various materials; deduced no environmental effect.
2004OH09, 2005OHZW, : 7Be(EC); measured Eγ, Iγ, T1/2 for source in beryllium metal.
2004OH10: 7Be(EC); measured Eγ, Iγ, T1/2 for source implanted in various metals; deduced environmental effect.
2005FU13: 7Be(EC); measured T1/2 for source implanted in metals; deduced no environmental effects.
2005ZH09: 7Be(EC); measured decay rates for source implanted in various metals.
2006LI46: 7Be(EC); measured T1/2 for source embedded in several materials; deduced no environmental effect.
2006NIZU: 7Be(EC); measured T1/2 for source in various host materials; deduced no environmental dependence.
2006RA07: 7Be(EC); measured T1/2 for source implanted in various materials; deduced environmental effects.
2006WA21: 7Be(EC); measured T1/2 for source implanted in various materials; deduced environmental effects.
2007NI02: 7Be(EC); measured T1/2 for source in various host materials; deduced no environmental dependence.
2008KU09: 7Be(EC); measured dependence of decay rate on temperature. Be in Cu host. No evidence found for temperature dependence on half-life.
2008LI20: 7Be(EC); measured T1/2 in different metallic environments.
2010LI01: 7Be(EC); measured Eγ, Iγ; deduced decay constant, T1/2 variation in Pt and Al foils.
2011OH07: 7Be(EC); measured decay products, Eγ, Iγ; deduced T1/2 at different temperatures and its variation for different materials.
2012MA04: 7Be(EC); measured decay products, Eγ, Iγ; deduced precise T1/2 values for different materials.
2020RA06: 7Be(EC); measured Eγ, Iγ, half-life, the decay rate of 7Be which has unexpectedly large increase (≈1%) under compression (25-40 GPa) .
Measurements for Branching Ratios
1938RU01: 7Be.
1948KU10: 7Be; measured Eγ.
1949TU06: 7Be; measured branching ratio.
1949WI13: 7Be.
1951DI12: 7Be.
1957DU37: 7Be.
1962TA11: 7Be(EC); measured not abstracted; deduced nuclear properties.
1965RO09: 7Be; measured Eγ.
1967BL03: 7Be; measured Eγ.
1969TAZX: 7Be; measured branching ratio.
1970MUZU: 7Be; measured γ-emission probability.
1971HE20: 7Be; measured Eγ.
1972SZ02: 7Be(EC); measured branching ratio for 7Be(EC)7Li; deduced S(E).
1973PO10: 7Be; deduced electron-capture branching.
1974GO26: 7Be; measured βγ-coin; deduced β-branching ratio.
1978HE21: 7Be; compiled, re-evaluated Eγ, measurement relative to 411-keV γ-ray from 198Au.
1981SA22: 7Be; measured IB spectra; deduced Q(EC).
1983BA15: 7Be(EC); measured Iγ. 7Li level deduced EC-branching ratio.
1983DA14: 7Be(EC); measured Eγ, Iγ. 7Li level deduced EC-branching ratio.
1983DO07: 7Be(EC); measured Eγ, Iγ. 7Li level deduced EC-branching ratio.
1983FIZV: 7Be(EC); measured γ-emission. 7Li level deduced EC-branching ratio.
1983TAZY: 7Be(EC); 7Li levels deduced Gamow-Teller, Fermi decay transition strengths, EC-branching ratio following 7Be decay.
1983KN10: 7Be(EC); measured internal bremsstrahlung spectra. 7Li levels deduced EC-branching ratios.
1983KU03: 7Be(EC); measured Eγ, Iγ, pair spectra. 7Li transition deduced Eγ.
1983MA34: 7Be(EC); measured Eγ, Iγ. 7Li level deduced EC-branching ratio.
1983NO03: 7Be(EC); measured Iγ. 7Li level deduced EC-branching ratio.
1984EV01: 7Be(EC); measured Iγ; deduced vector coupling constant G(A). 7Li level deduced EC-branching ratio.
1984FI10: 7Be(EC); measured Iγ. 7Li levels deduced electron capture branching ratio.
1984SK01: 7Be(EC); measured Iγ. 7Li levels deduced branching.
1993CH32: 7Be(EC); measured Eγ.
1995RE24: 7Be(EC); measured Eγ, Iγ.
1996JA10: 7Be(EC); measured Eγ, Iγ, T1/2.
1998GA08: 7Be(EC); measured K, L capture X-ray spectra.
1999HU20: 7Be(EC); measured Eγ, Iγ, T1/2.
2000HU20: 7Be(EC); measured Eγ, Iγ(t), T1/2.
2001NO10: 7Be(EC); measured Eγ, Iγ, T1/2 for sources implanted in various materials; deduced environmental effects.
2002VO01: 7Be(EC); measured X-ray spectra; deduced L/K capture ratio, possible in-medium effects.
2007OH02: 7Be(EC); measured decay rate in C60 at liquid helium temperature.
2010LI01: 7Be(EC); measured Eγ, Iγ; deduced decay constant, T1/2 variation in Pt and Al foils.
2011OH07: 7Be(EC); measured decay products, Eγ, Iγ; deduced T1/2 at different temperatures and its variation for different materials.
2012MA04: 7Be(EC); measured decay products, Eγ, Iγ; deduced precise T1/2 values for different materials.
2020FR07: 7Be(EC); measured decay products, phonons; deduced recoil spectra, L/K ratio.
Measured half-life for 7Be(ε)7Li

Adopted value: 53.22 ± 0.06 days (from LRSW, (1985ZIZY, 1992RA09) analysis)
Measured values: 53.42 ± 0.01 days (2000HU20)
53.12 ± 0.07 days (1996JA10)
53.284 ± 0.004 days (1982RUZV)
53.16 ± 0.01 days (1982CHZF)
53.17 ± 0.02 days (1975LA16)
53.0 ± 0.3 days (1974CR05)
53.52 ± 0.10 days (1970JO21)
53.1 ± 0.3 days (1965EN01)
53.5 ± 0.2 days (1957WR37)
53.0 ± 0.4 days (1956BO36)
53.61 ± 0.17 days (1953KR16)
52.93 ± 0.22 days (1949SE20)
53 ± 2 days (1940HI01)
Previous Measurements

 
Branching Ratio to 7Li*(0.48)
(%)		 Eγ
(keV)		 Log ft for
  7Li(0) 7Li*(4.8)
(1938RU01) 10+20-7 (ZA48) 474 ± 4 1954MA1D 3.33 3.48
(1949WI13) 10.7 ± 2.0 (1948KU10) 485 ± 5 1959AJ76 3.25 3.44
(1949TU06) 11.8 ± 1.2 (HO49A, RA49A) 476.7 ± 0.8 G. Fox and B. Zimmerman,
private communication to
Fay Ajzenberg-Selove (1974AJ01)		 3.30 3.54
(1951DI12) 12.3 ± 0.6 (TE49B) 478.5 ± 0.5
(1962TA11) 10.32 ± 0.16 P. Marmier, private communication
to Fay Ajzenberg-Selove
(1955AJ61)		 477.3 ± 0.4
(1969TAZX) 10.35 ± 0.08 M.J. Martin,
private communication to
Fay Ajzenberg-Selove (1979AJ01)		 3.32 3.55
(1970MUZU) 10.47 ± 0.20
(1972SZ02) 10.4 ± 0.3 (1957DU37) 477.3 ± 0.4
(1973PO10) 10.42 ± 0.18 (1965RO09) 477.4 ± 0.2      
(1974GO26) 10.35 ± 0.08 (1967BL03) 477.57 ± 0.05      
(1983BA15) 10.10 ± 0.45 (1971HE20) 477.593 ± 0.012      
(1983DA14) 10.61 ± 0.23 (1978HE21) 477.605 ± 0.003      
(1983DO07) 10.6 ± 0.5 (1983KU03) 477.6064 ± 0.0026      
(1983FIZV) 10.7 ± 0.3 (1993CH32) 477.60323 ± 0.00041      
(1983KN10) 10.9 ± 1.1          
(1983MA34) 10.7 ± 0.2          
(1983NO03)   9.8 ± 0.5          
(1983TAZY) 10.3 ± 1.1          
(1984EV01) 11.4 ± 0.7          
(1984FI10) 10.61 ± 0.17          
(1984SK01) 10.49 ± 0.07          
Back to Top

Back to Ground-State Decays Data Main Page

Back to Datacomp Home Page

Last modified: 23 June 2021