¹⁸⁵Re   ¹⁸⁶Re   ¹⁸⁷Re

Go to isotope

Total MACS at 30keV:	1438.5	±	58.0	mb
Partial c.s. to ground state:	1420	±	46	mb
Partial c.s. to isomer:	18.5	±	12.0	mb

Cross sections do not include stellar enhancement factors!

Version	Total MACS [mb]	Partial to gs [mb]	Partial to isomer [mb]
1.0	1438.5 ± 58.0	1420 ± 46	18.5 ± 12.0
0.0	-	1535 ± 62	-

(Version 0.0 corresponds to Bao et al.)

Note that the existing activation data determined only the partial cross section to the short-lived ground-state, not including the long-lived isomeric state. Time-of-flight measurements include both components but the existing data is 40 years old. The new rec. value to the isomer was calculated according to HSK05 with the ratio between the partial cross section to the isomer and the ground-state, R(m/g)= 0.54 (11) % at thermal energies, and extrapolated to R(m/g)= 1.3 (8) % at kT= 30 keV.

The new rec. partial cross section to ground-state was recalculated using new decay data NDS186 (neglecting the 1.5% change in the half-life), and extrapolating this recalculated data with the normalized energy dependencies of the evaluated libraries (endfb71, jeff30A, jeff312). This assumes the same energy dependence for the total and the partial cross section. The new uncertainty is the standard deviation between the normalized libraries (0.5-2.3%) plus the recalculated uncertainty of the single measurements in KJB91 (2.1-3.1%).
Last review: February 2014

original	renorm.	year	type	Comment	Ref
1520 E(n)= 23.1 keV		1971	c	Pb slowing down, TOF, Au+Ag+Te:Sat.	BKK71
1350 ± 162 E(n)= 30 keV		1969	c	Linac, TOF	FGH69
1168		2011	e	ENDF/B-VII.1; unphys. behavior of resonances	endfb71
1064		2006	e	ENDF/B-VII.0	endfb7
1064		2004	e	JEFF-3.1	jeff31
1530 ± 200		1971	e		AGM71
875		2005	t	MOST 2005	Gor05
915		2002	t	MOST 2002	Gor02
1166		2000	t	NON-SMOKER	RaT99
1473 ± 219		1991	t		KJB91
1572		1981	t		Har81
1810		1976	t		HWF76
Partial cross section to 186gRe:
1535 ± 62	1420 ± 46	1991,2013	r	VdG, Act., 1/v(kT), Au:RaK88; new gamma intensity: NDS186; en.dep. of endfb71,jeff30A,jeff312	KJB91
1080 ± 73 E(n)= 24.0 (18) keV		2011	c	F.N.B., Act., 1/v(E), 197Au: 643.8(54) mb (24 keV)	TSA11
2260 ± 247 E(n)= 25 (5) keV		1979	c	F.N.B., Act., 1/v(E), 127I: 832(26) mb (25 keV)	AJB79
1765 ± 265 E(n)= 24 keV		1966	c	Sb-Be, Act., 1/v(E), 127I: 820 mb	ChS66
1710 ± 167 E(n)= 29 (2) keV		1965	c	F.N.B., Act.	SSM65
2650 ± 500 E(n)= 24 keV		1957	c	Sb-Be, Act., 1/v(E), 127I: 820 mb	MLL57

Original:MACS [<σ v>/v_T] (mb) for kT=30 keV, based on the published cross sections except where indicated otherwise.
Renorm:MACS [<σ v>/v_T] (mb) for kT=30 keV for which the reference or standard cross section was meanwhile improved.
Type: The letters and numbers in the column labelled 'type' give information on how the cross section has been obtained:

c	Directly quoted from the reference itself
e	Evaluated value taken directly from the reference
t	Theoretical value
r	Recalculated for kT = 30keV with the code described in Ref. 2 after renormalizing the original data to updated standard cross sections

Energy	5keV	8keV	10keV	15keV	20keV	25keV	30keV	40keV	50keV	60keV	80keV	100keV
MACS	4650 ± 416	-	2815 ± 224	2150 ± 150	1804 ± 108	1588 ± 80	1439 ± 58	1240 ± 56	1112 ± 56	1021 ± 56	896 ± 58	812 ± 61
Xfactor	1.00	1.00	1.00	1.00	1.00	0.99	0.98	0.95	0.90	0.85	0.74	0.65
SEF	1.00	1.00	1.00	1.00	1.00	1.00	1.00	1.00	1.00	1.00	1.00	0.99
Rate	2.76	-	2.36	2.21	2.14	2.11	2.09	2.08	2.08	2.09	2.12	2.14

MACS:
Reference: KJB91,HSK05,endfb71,jeff30A,jeff312
Procedure: 'e+t' (The MACS from kT=5 keV to 100 keV are derived from calculated cross sections, which are then normalized to experimental data, e.g. to the values at kT=25 keV obtained in activation measurements. In these cases the uncertainties should be linearly increased below 25 and above 30 keV to reach about 30% at the extreme kT values.)
Year: 2013

X-factor:
Reference: Rau12
Year: 2012

SEF (Stellar enhancement factor):
Reference: Rau09
Year: 2009
Comment:

Rate:
Reaction rate N_A<σv> given in 10⁸ cm³/mole/s, including SEF

	185Ir 14.40 h β+ 186Ir 16.64 h β+ 187Ir 10.50 h β+ 188Ir 1.73 d β+ 189Ir 13.20 d β+ 184Os 0.02 590 mb 185Os 93.60 d β+ 186Os 1.59 422 mb 187Os 1.6 896 mb 188Os 13.29 399 mb 183Re 70.00 d β+ 184Re 38.00 d β+ 185Re 37.4 1535 mb 186Re 3.72 d 1550 mb, β- 187Re 41.20x109 y 1160 mb, β- 182W 26.5 274 mb 183W 14.31 515 mb 184W 30.64 223 mb 185W 75.10 d 703 mb, β- 186W 28.43 235 mb 181Ta 99.988 766 mb 182Ta 114.43 d 1120 mb, β- 183Ta 5.10 d β- 184Ta 8.70 h β- 185Ta 49.40 m β-

Style: (S, M, L, XL or Alberto)