ENTRY 32777 20180712 31863277700000001 SUBENT 32777001 20180712 31863277700100001 BIB 16 70 3277700100002 TITLE Activation cross section and isomeric cross section 3277700100003 ratio for the 76Ge(n,2n)75m,gGe process 3277700100004 AUTHOR (Junhua Luo, Li Jiang, Xinxing Wang) 3277700100005 INSTITUTE (3CPRHXU,3CPRNPC) 3277700100006 REFERENCE (J,EPJ/A,54,67,2018) 3277700100007 #doi:10.1140/epja/i2018-12501-y 3277700100008 FACILITY (NGEN,3CPRNPC) K-400 Neutron Generator 3277700100009 SAMPLE (32-GE-76,NAT=0.0773) Two disks, about 0.1 and 0.19 3277700100010 cm in thickness and 20 mm in diameter, were formed by 3277700100011 pressing approximately 1.7 and 3.2 g of Ge (99.99% 3277700100012 pure) powder (natural isotopic composition) at 980 MPa 3277700100013 to form a pellet. The samples were irradiated near 3277700100014 the target and sandwiched between two Nb foils (99.99% 3277700100015 pure, 0.12 mm thick) with the same diameter which 3277700100016 were used to monitor the neutron fluence via the 3277700100017 93Nb(n,2n)92mNb reaction. 3277700100018 INC-SOURCE (D-T) Neutrons were produced with an effective 3277700100019 deuteron beam energy of 135 keV, beam current of 240 3277700100020 uA, and the diameter of the deuteron beam spot was 3277700100021 under 0.6 cm. The samples were centered a 0.566 mg/cm2 3277700100022 thick T-Mo target at a distance of about 50 mm. The 3277700100023 diameter of the active zone of the T-Mo target is 1.2 3277700100024 cm. 3277700100025 DETECTOR (HPGE) The measurements were carried out using low- 3277700100026 background high-purity germanium detector (ORTEC, 3277700100027 model GEM 60P, crystal diameter 70.1 mm, crystal 3277700100028 length 72.3 mm) with a relative efficiency of about 3277700100029 68% and an energy resolution of 1.69 keV at 1.332 MeV 3277700100030 for Co-60. The detector was pre-calibrated for energy 3277700100031 and efficiency by using the standard gamma ray 3277700100032 sources Mn-54, Co-57, Co-60, Cd-109, Ba-133, Cs-137, 3277700100033 Eu-152, Am-241 and Ra-226. The distance from sample 3277700100034 to detector was 2.0 cm. 3277700100035 (SIBAR) The Au-Si surface barrier detector used in 3277700100036 alpha-particle tube was positioned at 135 degree and 3277700100037 110 cm from the target. 3277700100038 METHOD (ACTIV) Irradiation of the samples was lasted 3277700100039 approximately 3 minutes with a neutron yield 3 to 3277700100040 4E10 n/s in 4pi solid angle. The groups of samples 3277700100041 were placed at 0, 90, and 135 degree relative to the 3277700100042 beam direction. During irradiation, the neutron flux 3277700100043 was monitored by accompanying alpha-particles so that 3277700100044 corrections could be made for small variations of the 3277700100045 yield. 3277700100046 MONITOR (41-NB-93(N,2N)41-NB-92-M,,SIG) 3277700100047 DECAY-MON (41-NB-92-M,10.15D,DG,934.44,0.9915) 3277700100048 MONIT-REF (,M.Wagner+,B,PH-DAT,13-5,,1990) 3277700100049 CORRECTION Total correction factor of the activity were made up 3277700100050 of fs and fg: F=fs*fg. fs and fg were the correction 3277700100051 factors for the self-absorption of the sample at a 3277700100052 given gamma-ray energy and the counting geometry. 3277700100053 Correction factors for the self-absorption at 139.68 3277700100054 and 264.6 keV gamma-rays are 1.163, 1.067 for sample 3277700100055 1 (0.1863 cm), and 1.081, 1.034 for sample 2 (0.0948 3277700100056 cm). 3277700100057 ERR-ANALYS (ERR-T) Total uncertainty 4.5-8.7% 3277700100058 (ERR-S,0.5,3.2) Counting statistics 0.5-3.2% 3277700100059 (ERR-1,2.0,3.0) Detector efficiency 2.0-3.0% 3277700100060 (ERR-2) Weight of samples 0.1% 3277700100061 (ERR-3) Self-absorption of gamma-ray ~0.5% 3277700100062 (ERR-4,0.1,0.5) Uncertainties of irradiation, cooling 3277700100063 and measuring times 0.1-0.5% 3277700100064 (ERR-5) Relative gamma-ray intensity ~1.0% 3277700100065 (ERR-6,0.05,1.1) Half-life 0.05-1.1% 3277700100066 (ERR-7) Isotopic abundance 1.6% 3277700100067 (MONIT-ERR) Standard cross sections uncertainties 1.1- 3277700100068 1.5% 3277700100069 STATUS (TABLE) Data were obtained from Table 4 of 3277700100070 Eur.Phys.J.A,54,67,2018 3277700100071 HISTORY (20180918C) Compiled by Xiaoxue Zhao (CNDC) 3277700100072 ENDBIB 70 0 3277700100073 COMMON 4 3 3277700100074 ERR-2 ERR-3 ERR-5 ERR-7 3277700100075 PER-CENT PER-CENT PER-CENT PER-CENT 3277700100076 0.1 0.5 1.0 1.6 3277700100077 ENDCOMMON 3 0 3277700100078 ENDSUBENT 77 0 3277700199999 SUBENT 32777002 20180712 31863277700200001 BIB 3 8 3277700200002 REACTION 1(32-GE-76(N,2N)32-GE-75-M,,SIG) 3277700200003 2(32-GE-76(N,2N)32-GE-75-G,M-,SIG) 3277700200004 3(32-GE-76(N,2N)32-GE-75,,SIG) 3277700200005 4(32-GE-76(N,2N)32-GE-75-M/G,,SIG/RAT) 3277700200006 DECAY-DATA1(32-GE-75-M,47.7SEC,DG,139.68,0.3951) 3277700200007 2(32-GE-75-G,82.78MIN,DG,264.6,0.114) 3277700200008 CORRECTION2The contribution of the 76Ge(n,2n)75mGe reaction 3277700200009 via IT(isomeric transition, 99.97%) was subtracted 3277700200010 ENDBIB 8 0 3277700200011 NOCOMMON 0 0 3277700200012 DATA 12 3 3277700200013 EN EN-ERR DATA 1ERR-T 1DATA 2ERR-T 23277700200014 DATA 3ERR-T 3DATA 4ERR-T 4MONIT MONIT-ERR 3277700200015 MEV MEV MB MB MB MB 3277700200016 MB MB NO-DIM NO-DIM MB MB 3277700200017 13.5 0.2 870. 39. 376. 31.3277700200018 1246. 70. 2.3 0.2 457.9 6.83277700200019 14.1 0.2 899. 41. 380. 33.3277700200020 1279. 74. 2.4 0.2 459.8 6.83277700200021 14.8 0.2 910. 44. 381. 30.3277700200022 1291. 74. 2.4 0.2 459.7 5.03277700200023 ENDDATA 10 0 3277700200024 ENDSUBENT 23 0 3277700299999 ENDENTRY 2 0 3277799999999