ENTRY 22939 20110206
SUBENT C 22939001 20110206
BIB 14 48
TITLE Stellar (n,gamma) cross section of p-process isotopes
Part I: Pd-102, Te-120, Ba-130,-132 and Dy-156.
AUTHOR (I.Dillmann, C.Domingo-Pardo, M.Heil, F.Kaeppeler,
S.Walter, S.Dababneh,T.Rauscher, F.K.Thielemann,R.Plag)
REFERENCE (J,PR/C,81,015801,2010)
#doi:10.1103/PhysRevC.81.015801
(J,EPJ/AS,27,129,2006) Preliminary data.
#doi:10.1140/epja/i2006-08-018-5
INSTITUTE (2GERMUN) I.Dillmann
(2GERGSI) C.Domingo-Pardo, M.Heil
(2GERKFK) F.Kaeppeler, S.Walter
(2SWTBAS) T.Rauscher, F.K.Thielemann
(3JORJOR) S.Dababneh
Al Balqa Applied University,Salt 19117,Jordan.
REL-REF (R,,J.De Laeter+,J,PAC,75,683,2003)
Isotopic abundances for samples.
(I,,S.Dababneh+,J,NIM/A,517,230,2004)
Details of clover detectors.
(M,,H.Beer+,J,PR/C,21,534,1980) Details of exp.method
FACILITY (VDG,2GERKFK) The Karlsruhe 3.7-MV Van de Graaff
accelerator operated n DC mode with current of about
100 microA (for Li targets) or up to 150 microA for
LiF targets.
INC-SOURCE (P-LI7) Neutrons were produced via the Li-7(P,N)Be-7
source by bombarding a 30-mum thick layers of metallic
Li or crystalline LiF on a water-cooled Cu-backings
with protons of 1912 keV. Neutrons were emitted into
forward cone of 120 deg opening angle.
METHOD (ACTIV) Several independent activations were carried
out for each isotope with modified exp. parameters.
(STTA) Samples were irradiated in close contact with
the Li target.
MONITOR ((MONIT)79-AU-197(N,G)79-AU-198,,SIG) For neutron flux.
MONIT-REF (,W.Ratynski+,J,PR/C,37,595,1988)
DECAY-MON (79-AU-198,2.69517D,DG,411.8,0.9558)
HL error 0.00021 day, intensity 0.9558+-0.0012.
DETECTOR (GLASD) At irradiation the neutron flux was recorded
in intervals of 60 or 90sec using a Li-6 glass detector
91 cm downstream of Li target.
ADD-RES Using the energy dependencies of normalized evaluated
cross sections MACS were extrapolated in energy range
kT=160-260 keV. Given in Table XVI.
HISTORY (20061220C) S.M./ M.M.
(20100518A) M.M. Reference J,PR/C,81 was added.
BIB information was updated.
Subents 006-023 were added.
(20110206A) SD: Ref. on Europ.Phys.Jour. A 27,129,2006
corrected: EPJ/AS,27,129,2006.
ENDBIB 48 0
COMMON 3 3
KT-NRM MONIT MONIT-ERR
KEV MB MB
25. 586. 8.
ENDCOMMON 3 0
ENDSUBENT 55 0
------------------------------------------------------------------------
SUBENT 22939015 20100518
BIB 9 61
REACTION (56-BA-132(N,G)56-BA-133,,SIG,,SPA) Total n,g c-s.
SAMPLE Sample material of natural composition and high
elemental purity (>99.5%).
Isotope Sample material Rel.abundance (%)
Ba-132 BaCO3 0.101+-0.001
Sample Diameter Mass Irr. Tot.exposure
mm mg 10**18at time,min 10**14 n
Ba-1 Ba-130 8 106.9 0.346 7721 6.93
Ba-132 0.330
Ba-2 Ba-130 8 145.5 0.471 4014 2.70
Ba-132 0.448
Ba-3 Ba-130 10 149.7 0.484 4280 4.48
Ba-132 0.461
Thin pellets 6 to 10 mm in diameter were pressed from
the respective powder or granules and enclosed in thin
cannings made from 15-microm-thick Al foil. During the
irradiations the samples were sandwiched between
10-30-microm thick gold foils of the same diameter.
INC-SPECT Quasi-stellar neutron spectrum approximated by
Maxwell-Boltzmann distribution for kT=25.+-0.5 keV.
Neutron scattering in Cu backing is negligible.
Spectrum is given on Fig.2 of J,PR/C,81,01501,2010.
Average neutron intensity at sample position
(1.5-3.)*10**9 n/sec.
DECAY-DATA (56-BA-133-G,10.52YR,DG,356.0,0.6205)
HL=10.52+-0.13 yr. Intensity (62.05+-0.19)%.
DETECTOR (HPGE) The small gamma activity of Ba-133g was
measured with a system of two HPGe clover detectors.
Each consists of four independent HPGe n-type crystals
in a common cryostat. The two clovers were placed face
to face,in contact with a 5.2-mm-thick sample holder,
corresponding nearly to a 4-pi geometry.Whole assembly
was shielded against room background with 10 cm of lead
and a 5-mm-thick layer of copper.The efficiency
calibration of the clover system was carried out with
a set of weak reference sources.
CORRECTION GEANT4 code simulations of the correction factors :
Sample Ba-1 Ba-2 Ba-3
Thickness,mm 0.48 0.65 0.43
K-extended geometry 1.0002 1.0022 0.9994
K-gamma self-absorption 0.9820 0.9752 0.9841
K-summing effect 0.9575 0.9608 0.9570
K-total 0.9405 0.9390 0.9412
ERR-ANALYS (ERR-1) Uncertainty of detector efficiency.
(ERR-2) Uncertainty of divergence of flux.
(ERR-3) Uncertainty of Au sample mass.
(ERR-4) Uncertainty of gamma-ray self-absorption.
(ERR-5) Uncertainty of gamma-ray intensity for Au.
(ERR-6,0.1,1.0) Uncertainty of Au counting statistics.
(MONIT-ERR) Uncertainty of gold cross section., not
included in final uncertainty.
(ERR-7) Uncertainty of isotopic abundance.
(ERR-8) Uncertainty of gamma-ray intensity for Ba.
(ERR-9) Uncertainty of summing corrections.
(ERR-S,0.4,1.4) Uncertainty of counting statistics.
(ERR-T,3.7,4.0) Total uncertainty including respective
uncertainty of gold (2.0%-2.2%).
FLAG (1.) Measurement by sample Ba-1
(2.) Measurement by sample Ba-2
(3.) Measurement by sample Ba-3
STATUS (TABLE) Table IX of J,PR/C,81,01501,2010.
ENDBIB 61 0
COMMON 10 6
KT KT-ERR ERR-1 ERR-2 ERR-3 ERR-4
ERR-5 ERR-7 ERR-8 ERR-9
KEV KEV PER-CENT PER-CENT PER-CENT PER-CENT
PER-CENT PER-CENT PER-CENT PER-CENT
25. 0.5 2.0 2.0 0.2 0.2
0.1 1.0 0.3 0.4
ENDCOMMON 6 0
DATA 3 3
DATA ERR-T FLAG
MB MB NO-DIM
396.0 15.2 1.
403.9 15.6 2.
381.8 13.7 3.
ENDDATA 5 0
ENDSUBENT 78 0