ENTRY 23200 20131022 22372320000000001
SUBENT 23200001 20131022 22372320000100001
BIB 16 55 2320000100002
REFERENCE (J,NIM/A,727,1,2013) 2320000100003
AUTHOR (J.Praena, P.F.Mastinu, M.Pignatari, J.M.Quesada, 2320000100004
J.Garcia-Lopez, M.Lozano, N.Dzysiuk, R.Capote, 2320000100005
G.Martin-Hernandez) 2320000100006
TITLE Measurement of the MACS of Ta-181(n,gamma) at kT=30 keV2320000100007
as a test of a method for Maxwellian neutron spectra 2320000100008
generation. 2320000100009
INSTITUTE (2SPNSEU) J.Praena,J.M.Quesada,J.Garcia-Lopez,M.Lozano.2320000100010
Centro Nacional de Aceleradores (CNA), 2320000100011
Sevilla,Spain, http://centro.us.es/cna/ 2320000100012
J.Praena, J.Garcia-Lopez. 2320000100013
(2ITYPAD) P.F.Mastinu 2320000100014
(2SWTBAS) M.Pignatari. 2320000100015
(4UKRUKR) Intern. Nuclear Safety Center of Ukraine, 2320000100016
Kyiv, Ukraine. http://www.insc.gov.ua/ 2320000100017
N.Dzysiuk. 2320000100018
(3ZZZIAE) R.Capote 2320000100019
(3CUBPLY) Centro de Aplicaciones Tecnologicas y 2320000100020
Desarrollo Nuclear, 5ta y 30, Playa, La Havana,Cuba. 2320000100021
http://www.ceaden.cu/ 2320000100022
G.Martin-Hernandez. 2320000100023
REL-REF (I,,P.F.Mastinu+,J,NIM/A,601,333,2009) 2320000100024
Details of setup. 2320000100025
FACILITY (VDGT) 3 MV Tandem Pelletron Accelerator at CNA. 2320000100026
INC-SOURCE (P-LI7) Li layer of 390 microm thickness, water cooled.2320000100027
Proton beam current 3 microA . 2320000100028
Terminal voltage 1.789 MV (equivalent to proton 2320000100029
energy 3.665 MeV) was found to be optimal to produce 2320000100030
INC-SPECT Maxwellian neutron spectrum with kT=30 keV. 2320000100031
Neutron spectra were obtained by combining analytical 2320000100032
description of Li7(n,P) reaction energy-angular 2320000100033
distribution and Monte Carlo simulation ( MCNPX code) 2320000100034
of the neutron transport within exp.setup. 2320000100035
SAMPLE Gold and tantalum samples of 2.5 cm diameter, 0.1 mm 2320000100036
and 0.75 mm thickness, respectively, were secured to 2320000100037
the back surface of the backings. 2320000100038
METHOD (ACTIV) 3hr neutron irradiation. 2320000100039
DETECTOR (HPGE) HPGe from ORTEC (GMX Serie). 2320000100040
MONITOR (79-AU-197(N,G)79-AU-198,,SIG,,MXW) 2320000100041
MACS for Au was used as reference. 2320000100042
DECAY-MON (79-AU-198-G,2.6947D,DG,411.8,0.956) 2320000100043
MONIT-REF (22099001,W.Ratynski+,J,PR/C,37,595,1988) 2320000100044
CORRECTION -For self-absorption and multiple scattering for Au 2320000100045
correction coefficient 0.988. 2320000100046
-For self-absorption and multiple scattering for Ta 2320000100047
correction coefficient 0.975. 2320000100048
-Fluence ratio gold/tantalum was estimated to be 1.03 2320000100049
assuming an average of 92.5% for the tantalum flux 2320000100050
reduction. 2320000100051
- Environmental background was measured. 2320000100052
- Efficiency was corrected considering the solid angle 2320000100053
covered by Ta and Au sample. 2320000100054
- Dead time < 0.2 %, negligible. 2320000100055
- Proton beam instability was small and negligible. 2320000100056
HISTORY (20131022C) M.M. 2320000100057
ENDBIB 55 0 2320000100058
NOCOMMON 0 0 2320000100059
ENDSUBENT 58 0 2320000199999
SUBENT 23200002 20131022 22372320000200001
BIB 4 19 2320000200002
REACTION (73-TA-181(N,G)73-TA-182,,SIG,,MXW) 2320000200003
DECAY-DATA (73-TA-182-G,114.7D,DG,1121.3,0.352) 2320000200004
ERR-ANALYS Uncertainties (one sigma) were taken into account: 2320000200005
(ERR-1) Thickness of samples. 2320000200006
(ERR-2) Correction for self-absorption and multiple 2320000200007
scattering for Au. 2320000200008
(ERR-3) Correction for self-absorption and multiple 2320000200009
scattering for Ta. 2320000200010
(ERR-4,,0.2) Uncertainty of Au gamma-line intensity. 2320000200011
(ERR-5,,0.2) Uncertainty of Ta gamma-line intensity. 2320000200012
(ERR-6) Detection efficiency. 2320000200013
(ERR-7,,0.1) Au half-life. 2320000200014
(ERR-8) Ta half-life. 2320000200015
(ERR-9) Fluence ratio gold/tantalum. 2320000200016
(ERR-10) Fitting procedure. 2320000200017
(MONIT-ERR) MACS Au reference. 2320000200018
(ERR-S) Counting statistics. 2320000200019
(ERR-T) Total uncertainty 9 %. 2320000200020
STATUS (TABLE) Table 2 of J,NIM/A,727,1,2013 2320000200021
ENDBIB 19 0 2320000200022
COMMON 8 6 2320000200023
ERR-1 ERR-S ERR-2 ERR-3 ERR-6 ERR-8 2320000200024
ERR-9 ERR-10 2320000200025
PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 2320000200026
PER-CENT PER-CENT 2320000200027
0.1 0.3 0.2 0.4 5.8 0.1 2320000200028
0.2 0.1 2320000200029
ENDCOMMON 6 0 2320000200030
DATA 5 1 2320000200031
KT DATA ERR-T MONIT MONIT-ERR 2320000200032
KEV MB MB MB PER-CENT 2320000200033
30. 815. 73. 582. 1.5 2320000200034
ENDDATA 3 0 2320000200035
ENDSUBENT 34 0 2320000299999
ENDENTRY 2 0 2320099999999