1987DUZU, 1988DU09, 1988DUZT, 1989MUZU: ¹⁷B(β^-n); measured β-delayed neutron spectra; deduced T_1/2, multi-neutron branching ratios.

1987MIZU, 1988SA04: ¹⁷B; measured β-decay T_1/2.

1989LE16: ¹⁷B; measured T_1/2, delayed n emission probabilities.

1991RE02: ¹⁷B; measured T_1/2, neutron emission probability, upper limits. Tof isochronous spectrometer, ion-neutron delayed coincidence.

1994REZZ: ¹⁷B(β^-n); measured delayed n intensity, T_1/2.

1995UEZZ, 1996UE02, 1996UEZZ: ¹⁷B(β^-); measured NMR; deduced μ.

1996RA02: ¹⁷B(β^-); measured β^--delayed E_n, E_γ, E_β, nγ-, nβ-coin, T_1/2; deduced log ft. ¹⁷C deduced levels, J, π.

1997YAZX: ¹⁷B(β^-), (n); measured β-ray asymmetry, E_n, E_γ, nβ-, nγ-coin; deduced I_β, log ft, B(GT). ¹⁷C deduced levels, J, π.

2002OG02: ¹⁷B(β^-); measured β-NMR spectra from polarized nuclei. ¹⁷B deduced quadrupole moment. ¹⁷C deduced g-factor, ground-state J, π.

2003ASZZ, 2003OG03: ¹⁷B(β^-); measured β-NMR spectra from polarized source. ¹⁷B deduced quadrupole moment.

2013UE01: ¹⁷B(β^-), (β^-n), (β^-2n); measured E_γ, I_γ, E_β, I_β, β-NMR, βγ-, βγγ-, βnγ-coin; ¹⁷C; deduced levels, J, π, widths, P(0n), P(1n), P(2n), B(GT). ¹⁶C; deduced levels. No γ rays observed for delayed-3n and delayed-4n channels of ¹⁷B decay, thus P(3n), P(4n) not determined.

2015UEZZ: ¹⁷B(β^-); measured β-delayed E_n, I_n, E_γ, I_γ from spin-polarized source.

Measured half-life for ¹⁷B(β^-)¹⁷C

Recommended value (August, 2015):	5.07 ± 0.05 ms
Summary Table of Uncertainty Analysis:	(PDF)
Measured values:	4.93 ± 0.19 ms	(1996RA02)
	5.20 ± 0.45 ms	(1994REZZ: see also 5.9 ± 3.0 ms in (1991RE02) and 5.2 ± 0.4 ms in
		the unpublished private communications of (2008REZZ)/(1995REZZ).)
	6 ± 2 ms	(1989LE16)
	5.08 ± 0.05 ms	(1988DU09)
	5.3 ± 0.6 ms	(1988SA04)
Other Reviews:	5.08 ± 0.05 ms	(2015BI05)

Previous Measurements

 

Atomic Mass Excess (MeV)		Eβ-(max) (MeV)		Branching Ratio (%)
				Reference	Pn	P0n	P1n				P2n	P3n	P4n
(1985WA02)	44.01 ± 0.70 a	(1977AJ02)	23.1	(1988DU09)	85 ± 15	21 ± 2	63 ± 1				11 ± 7	3.5 ± 0.7	0.4 ± 0.3
(1987GI05)	42.82 ± 0.80	(1982AJ01)	23.3	(1989LE16)	70 ± 30
(1988WO09)	43.62 ± 0.17	(1986AJ04)	22.98	(1991RE02)	65 ± 35
(1991OR01)	43.90 ± 0.23			(1996RA02)			En (MeV)	Ei (17C) → Ef (16C)	Branching (%) b	log ft
							2.91 ± 0.05	3.82 ± 0.05 → 0	17.8 ± 1.4	4.91 ± 0.15
							1.80 ± 0.02	2.64 ± 0.02 → 0	29.6 ± 2.5	4.82 ± 0.14
							[1.43 ± 0.02] c	[2.25 ± 0.02] → [0]	[4.7 ± 1.5]	[5.66 ± 0.19]
							[0.42 ± 0.01] d	[1.18 ± 0.01] → [0]	[10.8 ± 3.0]	[5.41 ± 0.18]
				(2013UE02)			En (MeV)	Ei (17C) → Ef (16C)	Branching (%)	log ft
							En = 5.04 ± 0.02	6.08 ± 0.03 → 0	4 ± 1	5.31 ± 0.11
							En = 3.81 ± 0.01	4.78 ± 0.02 → 0	0.9 ± 0.1	6.12 ± 0.06
							En = 1.46 ± 0.01	4.05 ± 0.02 → 1.77	1.5 ± 0.2	5.98 ± 0.07
							En = 3.01 ± 0.01	3.93 ± 0.02 → 0	20 ± 3	4.87 ± 0.07
							En = 1.86 ± 0.01	2.71 ± 0.02 → 0	33 ± 4	4.78 ± 0.06
							Eγ (MeV)	Ei (17C) → Ef (17C)	Branching (%)	log ft
							Eγ = 0.331 ± 0.002	0.331 ± 0.002 → 0	2.1 ± 0.2	6.22 ± 0.05
							Eγ = 0.217 ± 0.002	0.217 ± 0.002 → 0	2.8 ± 1.1	6.1 ± 0.2
								0 → 0	17 ± 4	5.34 ± 0.11

a) Estimated value.

b) Normalized to 63 ± 1 % (1988DU09).

c) Peak is under broad shoulder, assignment suggested by peak fitting.

d) Suggested by energy spectrum.

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¹⁷N(β^-)¹⁷O Evaluated Data

¹⁷F(β⁺)¹⁷O Evaluated Data

¹⁷Ne(β⁺)¹⁷F Evaluated Data

A = 17 Beta-Decays Diagram

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Last modified: 29 November 2021