Systematic uncertainties on the cosmic-ray transport parameters - Is it possible to reconcile B/C data with δ = 1/3 or δ = 1/2?

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Table 10:

Best-fit parameters for a few selected configurations.
Model	$\eta _{\rm T}$	$K_0\times 10^2$	$\delta$	$V_{\rm c}$	$V_{\rm a}$	$\chi^2$ /d.o.f.
		(kpc² Myr^-1)		(km $\;$ s^-1)	(km $\;$ s^-1)
III $^{\dagger}$	SA	0.481	0.856	18.84	37.98	1.47
III/II $^{\star}$	-1.3	3.161	0.512	0.	45.35	2.26
I/0 $^{\ddagger}$	-2.61	2.054	0.613	0.	...	3.29
II $^{\dagger}$	SA	9.753	0.234	...	73.14	4.73

Notes. Standard models refer to SA diffusion coefficients (see Table 5). Alternative models show their different values for $\eta _{\rm T}$ , as parameterised from Eq. (10). $^{(\dagger)}$ Best-fit transport parameters for standard Model II and III. $^{(\ddagger)}$ Best-fit parameters with $\eta _{\rm T}$ free (no reacceleration). $^{(\star)}$ Best-fit parameters for fixed $\eta _{\rm T}$ .

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