SUBENT 22846001 20211007 23042284600100001
BIB 19 81 2284600100002
TITLE Neutron capture studies on unstable 135Cs for 2284600100003
nucleosynthesis and transmutation 2284600100004
AUTHOR (N.Patronis, S.Dababneh, P.A.Assimakopoulos, R.Gallino,2284600100005
M.Heil, F.Kaeppeler, D.Karamanis, P.E.Koehler, 2284600100006
A.Mengoni, R.Plag) 2284600100007
INSTITUTE (2GRCIOA,2GERKFK,2ITYTUR,1USAORL,2ZZZCER) 2284600100008
REFERENCE (J,PR/C,69,025803,2004) 2284600100009
(R,INDC(GER)-0053,2021) Revised values of Karlsruhe 2284600100010
cross sections. 2284600100011
FACILITY (VDG,2GERKFK) 3.7 MV VdG (for 30+500 keV irradiations)2284600100012
(REAC,2GERMNZ) TRIGA reactor(to obtain number of 135Cs)2284600100013
INC-SOURCE (P-LI7) Li (30 um for En~30 keV and 10 um for 2284600100014
En~500 keV, 6 mm in diam.) evaporated on to a 1.0 mm 2284600100015
thick Cu backing irradiated by proton beam 2284600100016
(Ep=1892 keV for En~30 keV, Ep=2284 keV for 2284600100017
En~500 keV) typically 90 to 100 uA. 2284600100018
(REAC) in 2GERMNZ 2284600100019
INC-SPECT Calculated from DDX of 7Li(p,n)7Be by using a code 2284600100020
NYIELD (NOT a quasi-Maxwellian spectrum) 2284600100021
Epithermal(En>0.4 eV)/thermal=4/70 at the irradiation 2284600100022
position 2284600100023
SAMPLE Cs sample (0.03 mm thick, 6 mm in diam., was specified 2284600100024
as 1.8E+15 135Cs atoms corresponding to a total mass 2284600100025
of ~400 ng) implanted in a graphite disc (0.1 mm 2284600100026
thick and 6 mm in diam.) and canned in a cylindrical 2284600100027
graphite box with 0.3 mm thick walls, which was 2284600100028
sandwiched between two Au foils. 2284600100029
The number of 135Cs was determined by reactor neutron 2284600100030
irradiation via the well-known thermal neutron 2284600100031
capture cross section (T.Katoh et al., 1997). 2284600100032
Au foils were replaced approximately every three days 2284600100033
because of the half-life of 198Au (2.7 d). 2284600100034
METHOD (ACTIV) Irradiation lasted for about two weeks 2284600100035
(GSPEC) Measurement of two weeks following irradiation 2284600100036
DETECTOR (HPGE) Two Clover-type HPGe (Ge crystal with ~50 mm in 2284600100037
diam. and ~70 mm long) with efficiency of 2284600100038
(1.069+/-0.017)E-01 for the 136Cs 818.5 keV line 2284600100039
(HPGE) 40 cm3 HPGe to measure Au and Re foils activity 2284600100040
with efficiency of (2.20+/-0.03)E-03 for the 198Au 2284600100041
412 keV line 2284600100042
(GLASD) Li-6 glass detector at 0 deg to monitor flux 2284600100043
variation at KFK VdG 2284600100044
MONITOR (79-AU-197(N,G)79-AU-198,,SIG,,SPA) 2284600100045
DECAY-MON (79-AU-198-G,2.6952D,DG,411.8,0.9558) 2284600100046
REL-REF (R,,J.F.Mughabghab,B,NEUT.CS 1B,,,1984) 2284600100047
Thermal data for 185,187Re(n,gamma) 2284600100048
(R,22342002,T.Katoh+,J,NST,34,431,1997) 2284600100049
135Cs(n-th,gamma) cross section = 8.3+/-0.3 barn 2284600100050
(R,22342004,T.Katoh+,J,NST,34,431,1997) 2284600100051
135Cs(n-th,gamma) resonance integral = 37.9+/-2.7 barn2284600100052
DECAY-DATA (55-CS-136-G,13.16D,DG,818.5,0.997) 2284600100053
ASSUMED Values adopted for analysis of thermal data: 2284600100054
135Cs(n,gamma)136Cs 2284600100055
sigma(n-th,gamma)=8.3+/-0.3 b, Ires=37.9+/-2.7 b 2284600100056
T1/2=13.16(3) d, Eg=818.5 keV, Ig=99.7(6)% 2284600100057
185Re(n,gamma)186Re 2284600100058
sigma(n-th,gamma)=112(2.0) b, Ires=1717(50) b 2284600100059
T1/2=3.7183(11) d, Eg=137.2 keV, Ig=9.42(6)% 2284600100060
187Re(n,gamma)188g+mRe 2284600100061
sigma(n-th,gamma)=76.4(10) b, Ires=300(20) b 2284600100062
T1/2=17.0040(22) h, Eg=155.0 keV, Ig=15.61(18)% 2284600100063
187Re(n,gamma)188mRe 2284600100064
sigma(n-th,gamma)=2.8(1) b, 2284600100065
T1/2=18.59(4) min. 2284600100066
CORRECTION Data are corrected for 2284600100067
- self-attenuation 2284600100068
- dead time 2284600100069
- difference of neutron flux at Au and Cs foil position2284600100070
- decay during irradiation 2284600100071
- time variation in neutron flux 2284600100072
ADD-RES (DECAY) T1/2(136Cs)=13.04+/-0.03 d (818.5 keV line), 2284600100073
=13.04+/-0.04 d (1048 keV line). 2284600100074
STATUS (APRVD) Approved by Franz Kaeppeler (2014-09-09) 2284600100075
HISTORY (20041206C) SM 2284600100076
(20101105A) SD: DOI for Phys.Rev. added. Author's name 2284600100077
corrected. ERR-1 deleted from COMMON 2284600100078
(20130112A) SD: EN-MEAN -> KT in Subent 6. Subents 7-102284600100079
were deleted (No data measured in this experiment). 2284600100080
(20140828A) On.001-004,006 revised. 005 moved to 22448.2284600100081
(20211007A) SD: Corrections in all Subents. 2284600100082
Subents 011-017 added. 2284600100083
ENDBIB 81 0 2284600100084
NOCOMMON 0 0 2284600100085
ENDSUBENT 84 0 2284600199999
SUBENT 22846003 20211007 23042284600300001
BIB 5 17 2284600300002
REACTION (55-CS-135(N,G)55-CS-136,,SIG,,SPA) 2284600300003
REL-REF (R,22099002,W.Ratynski+,J,PR/C,37,595,1988) 2284600300004
Spectrum averaged cross section to renormalize 2284600300005
the ENDF/B-VI 197Au(n,g)198Au cross section 2284600300006
ENDF/B-VI cross section renormalized by a factor 2284600300007
0.958 to reproduce Ratynski et al. (1988). 2284600300008
ERR-ANALYS (ERR-1) Measurement of fast flux (5.1%) 2284600300009
(ERR-2) 135Cs thermal capture cross section (3.6%) 2284600300010
(ERR-3) 135Cs effect of resonance integral (0.1%) 2284600300011
(ERR-4) Measurement of thermal flux (2.1%) 2284600300012
(ERR-5,,0.5) Time factors (<0.5%) 2284600300013
(MONIT-ERR) 197Au capture cross section (3%) 2284600300014
(ERR-S) Counting statistics (5.8%) 2284600300015
(ERR-T) Total error 2284600300016
STATUS (TABLE) Table V of Phys.Rev.C69(2004)025803 2284600300017
HISTORY (20140828A) On. Re-compiled. 2284600300018
(20211007U) SD: REL-REF added. 2284600300019
ENDBIB 17 0 2284600300020
COMMON 4 3 2284600300021
ERR-1 ERR-2 ERR-3 ERR-4 2284600300022
PER-CENT PER-CENT PER-CENT PER-CENT 2284600300023
5.1 3.6 0.1 2.1 2284600300024
ENDCOMMON 3 0 2284600300025
DATA 6 1 2284600300026
EN-MEAN EN-RSL-FW DATA ERR-T MONIT-ERR ERR-S 2284600300027
KEV KEV MB PER-CENT PER-CENT PER-CENT 2284600300028
500. 67. 34.8 8.6 3. 5.8 2284600300029
ENDDATA 3 0 2284600300030
ENDSUBENT 29 0 2284600399999