ENTRY 23418 20180914 22712341800000001 SUBENT 23418001 20180914 22712341800100001 BIB 15 52 2341800100002 TITLE The (n, 2n) reaction for the lightest stable erbium 2341800100003 isotope 162Er from reaction threshold up to 19 MeV 2341800100004 AUTHOR (E.Georgali,Z.Eleme,N.Patronis,X.Aslanoglou,M.Axiotis, 2341800100005 M.Diakaki,V.Foteinou,S.Harissopulos,A.Kalamara, 2341800100006 M.Kokkoris, A.Lagoyannis,N.G.Nicolis,G.Provatas, 2341800100007 A.Stamatopoulos, S.Stoulos,A.Tsinganis,E.Vagena, 2341800100008 R.Vlastou,S.M.Vogiatzi) 2341800100009 INSTITUTE (2GRCIOA,2GRCATH,2FR SAC,2GRCTUA,2GRCARU,2ZZZCER) 2341800100010 REFERENCE (J,PR/C,98,014622,2018) 2341800100011 #doi:10.1103/PhysRevC.98.014622 2341800100012 FACILITY (VDGT,2GRCATH) 5.5 MV Tandem Van de Graaff accelerator 2341800100013 of NSCR Demokritos. 2341800100014 INC-SOURCE (D-D) D2 gas target. The samples were placed at 2341800100015 0 degree with respect to the primary deuteron beam and 2341800100016 at 7 cm distance from the center of the gas cell. 2341800100017 (D-T) Deuteron beam energies 2.5, 3.0 and 3.5 MeV were 2341800100018 used for the production of 17.1, 18.1 and 19.0 MeV 2341800100019 neutrons respectively. 2341800100020 INC-SPECT Neutron energy spectra calculated with NEUSDESC code 2341800100021 plotted on Fig. I. 2341800100022 DETECTOR (HPGE) Two 100% relative efficiency high-purity 2341800100023 germanium detectors placed face to face in close 2341800100024 geometry. 2341800100025 Two 16% relative efficiency HPGe detectors were used 2341800100026 for activity measurements of the monitor foils placed 2341800100027 at a distance of 7 cm. 2341800100028 SAMPLE (68-ER-162,NAT=0.139) Two Er2O3 erbium samples of 2341800100029 1 g each with purity >99.99% and 10% cellulose. 2341800100030 Pellets of 2 mm thickness and 13 mm diameter. 2341800100031 METHOD (ACTIV) Irradiation time - 10 h 2341800100032 Irradiation parameters: 2341800100033 En (MeV) Irr. time (h) Meas. time (h) Decay corr.2341800100034 10.7 9.95 4.00 0.387 2341800100035 11.0 9.88 10.11 0.404 2341800100036 11.3 10.10 5.12 0.416 2341800100037 17.1 10.07 10.01 0.414 2341800100038 18.1 10.00 5.00 0.397 2341800100039 19.0 9.98 7.01 0.392 2341800100040 (GSPEC) 2341800100041 (STTA) 2341800100042 CORRECTION - gamma rays self-attenuation 2341800100043 - dead-time 2341800100044 - coincidence summing effects were estimated to be 2341800100045 negligible. 2341800100046 MONITOR (13-AL-27(N,A)11-NA-24,,SIG) 2341800100047 (79-AU-197(N,2N)79-AU-196,,SIG) 2341800100048 (41-NB-93(N,2N)41-NB-92-M,,SIG) 2341800100049 MONIT-REF (,,3,IRDFF-1,,2014) 2341800100050 DECAY-MON (11-NA-24,14.997HR,DG,1368.626,0.999936) 2341800100051 (79-AU-196-G,6.1669D,DG,333.03,0.22881) 2341800100052 (41-NB-92-M,10.15D,DG,934.44,0.9915) 2341800100053 HISTORY (20180914C) VS 2341800100054 ENDBIB 52 0 2341800100055 NOCOMMON 0 0 2341800100056 ENDSUBENT 55 0 2341800199999 SUBENT 23418002 20180914 22712341800200001 BIB 4 29 2341800200002 REACTION (68-ER-162(N,2N)68-ER-161,,SIG) 2341800200003 DECAY-DATA (68-ER-161,3.21HR,DG,826.6,0.6405) 2341800200004 ERR-ANALYS (ERR-T) Total uncertainties obtained by summing up 2341800200005 quadratically the following individual uncertainties: 2341800200006 (ERR-S) 161Er peak counting statistics 2341800200007 (ERR-1) 2 x100% HPGe detectors efficiency - 3.8% 2341800200008 (ERR-2) 161Er gamma-ray intensity per decay 5.8% 2341800200009 (ERR-3) Erbium target self-attenuation correction 2341800200010 factor - 0.5% 2341800200011 (ERR-4) 162Er natural abundance - 3.6% 2341800200012 (ERR-5) Neutron flux - 7.0% 2341800200013 Neutron flux uncertainty determined from: 2341800200014 - 16% HPGe efficiency 27Al(n,alpha)24Na - 2.0% 2341800200015 - 16% HPGe efficiency 197Au(n,2n)196Au - 1.9% 2341800200016 - 16% HPGe efficiency 93Nb(n,2n)92mNb - 1.6% 2341800200017 - Na-24 gamma-ray intensity per decay - 0.0015 2341800200018 - Au-196 gamma-ray intensity per decay - 4.1% 2341800200019 - Al foils self-attenuation correction factor - 0.50% 2341800200020 - Au foils self-attenuation correction factor - 0.18% 2341800200021 - Nb foils self-attenuation correction factor - 0.4% 2341800200022 - Reference foils counting statistics: 2341800200023 10.7 11.0 11.3 2341800200024 27Al(n,alpha)24Na 197Au(n,2n)196Au 93Nb(n,2n)92mNb 2341800200025 2.6, 3.4 2.1,1.1 14.0, 11.8 2341800200026 17.1 18.1 19.0 2341800200027 197Au(n,2n)196Au 197Au(n,2n)196Au 93Nb(n,2n)92mNb 2341800200028 4.6,3.0 5.4,6.4 7.1,7.6 2341800200029 STATUS (TABLE) Cross sections tbl. VI; uncertainties table IV 2341800200030 of Phys.Rev.C98(2018)014622 2341800200031 ENDBIB 29 0 2341800200032 COMMON 5 3 2341800200033 ERR-1 ERR-2 ERR-3 ERR-4 ERR-5 2341800200034 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 2341800200035 3.8 5.8 0.5 3.6 7.0 2341800200036 ENDCOMMON 3 0 2341800200037 DATA 8 6 2341800200038 EN EN-RSL-FW DATA ERR-T ERR-S MONIT1-ERR 2341800200039 MONIT2-ERR MONIT3-ERR 2341800200040 MEV MEV B B PER-CENT PER-CENT 2341800200041 PER-CENT PER-CENT 2341800200042 10.7 0.1 0.44 0.08 16.0 1.02341800200043 2341800200044 11.0 0.1 0.57 0.06 2.9 2341800200045 2.7 2341800200046 11.3 0.1 0.72 0.11 10.5 2341800200047 1.2 2341800200048 17.1 0.3 1.97 0.22 5.5 2341800200049 2.1 2341800200050 18.1 0.2 1.84 0.23 7.5 2341800200051 1.9 2341800200052 19.0 0.2 1.92 0.23 7.0 2341800200053 1.2 2341800200054 ENDDATA 16 0 2341800200055 ENDSUBENT 54 0 2341800299999 ENDENTRY 2 0 2341899999999