1975AZ01: ¹¹C; measured T_1/2.

1975BE28: ¹¹C; measured T_1/2, β-shape spectrum; deduced E_β(max), ft, shape factors.

2000LE02: ¹¹C(β⁺); measured T_1/2.

2002WO02: ¹¹C(β⁺), (EC); measured E_γ, I_γ, βγ-coin, T_1/2; deduced source standardization.

2004NI04: ¹¹C(β⁺), (EC); measured βγ-coin.

Measured half-life for ¹¹C(β⁺)¹¹B

Adopted value:	20.367 ± 0.014 min,	weighted average of (1969AW02, 1975AZ01, 2002WO02)
Measured values:	20.334 ± 0.024 min	(2002WO02)
	20.370 ± 0.029 min	(DDEP)
	20.382 ± 0.020 min	(1975AZ01)
	20.32 ± 0.12 min	(1975BE28)
	19.8 ± 0.8 min	(1973HO43)
	20.0 ± 0.3 min	(1973SIYS)
	20.40 ± 0.04 min	(1969AW02)
	20.8 ± 0.4 min	(1965PA10)
	20.34 ± 0.04 min	(1964KA31)
	20.11 ± 0.13 min	(1958AR15)
	20.8 ± 0.2 min	(1957PR53)
	20.26 ± 0.1 min	(1955BA63)
	20.74 ± 0.10 min	(1953KU08)
	20.0 ± 0.1 min	(1951DI12)
	20.0 ± 0.4 min	(1944SI30)
	20.50 ± 0.6 min	(1941SO01)
	20.35 ± 0.08 min	(1941SM11)

Previous Measurements

 

Log ft		Eβ+(max) (keV)		K/β+ ratio (%)
(1954WO23)	3.62 b	(1940MO09)	1030 ± 30	(1957SC29)	0.19 ± 0.03
(1968AJ02)	3.589 ± 0.001	(1954WO23)	968 ± 8	(1967CA09)	0.230+0.014-0.011
a	3.591 ± 0.002	(1967CA09)	958.2 ± 1.4
(1975BE28)	3.593 ± 0.006	(1975AZ01)	960 ± 1 d
(1975AZ01)	3.599 ± 0.002 c	(1975BE28)	960.8 ± 2.6

a) B. Zimmerman, private communication to Fay Ajzenberg-Selove, (1975AJ01).

b) Using T1/2 = 20.4 min.

c) Based on Eβ+(max) = 960 + 1 keV (from Qm).

d) From Qm.

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¹¹Be(β^-)¹¹B Evaluated Data

A = 11 Beta-Decays Diagram

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Last modified: 08 July 2009