ENTRY 31482 20030124 00003148200000001 SUBENT 31482001 20030124 00003148200100001 BIB 15 48 3148200100002 INSTITUTE (3CPRBJG) First four authors. 3148200100003 (3CPRAEP) Last three authors. 3148200100004 REFERENCE (J,CNP,19,(2),110,199705) 3148200100005 (J,CNDP,17,13,199706) 3148200100006 AUTHOR (Chen Jinxiang,Shi Zhaomin,Tang Guoyou,Zhang Guohui, 3148200100007 Lu Hanlin,Han Xiaogang,Huang Xiaolong) 3148200100008 TITLE Measurement of Neutron Capture Cross Section for 3148200100009 Hf-180. 3148200100010 FACILITY (VDG,3CPRBJG) 4.5 MV Van de Graaff accelerator at 3148200100011 Institute of Heavy Ion Physics, Peking University. 3148200100012 INC-SOURCE (P-T) Monoenergetic neutrons, with energies of 0.52, 3148200100013 1.10 and 1.60 MeV, were produced via the T(p,n)He-3 3148200100014 reaction on a solid T-Ti target of 1.48 mg/cm**2 in 3148200100015 thickness. The energies of the proton beam were 1.45, 3148200100016 2.0, 2.5 MeV respectively. 3148200100017 SAMPLE Natural metallic Hafnium powder with purity 88.398% 3148200100018 pressed into disks of 10 mm in diamater and 1.0 mm in 3148200100019 thickness. Each sample was sandwiched between gold 3148200100020 disks. The samples were placed at zero degree's rela- 3148200100021 tive to the incident proton beam at about 1.4 cm from 3148200100022 the T-Ti target. 3148200100023 METHOD (ACTIV) 3148200100024 DETECTOR (HPGE) 3148200100025 MONITOR (79-AU-197(N,G)79-AU-198,,SIG) The cross sections were 3148200100026 taken from ENDF/B-6. The fluctuation of the neutron 3148200100027 fluence rate was monitored with a BF3 long counter. 3148200100028 DECAY-MON (79-AU-198-G,64.704HR,DG,411.8,.9557) 3148200100029 CORRECTION Corrections have been made for detector efficiency, 3148200100030 cascade effect, gamma intensity, fluctuation of 3148200100031 neutron fluence rate and gamma-ray self absorption 3148200100032 in the samples. 3148200100033 ERR-ANALYS The principal sources of errors are as follows: 3148200100034 Source of uncertainty Relative errors (%) 3148200100035 -------------------------------------------------------3148200100036 - Reference cross section. 3148200100037 - G-counting statistics for Hf-181. 3148200100038 - G-counting statistics for Au-198. 3148200100039 - G-detection efficiency for Hf-181. 3148200100040 - G-detection efficiency for Au-181. 3148200100041 - Correction for self absorption for Hf-181. 3148200100042 - Correction of cascade effect for Hf-181. 3148200100043 - Hf-180 sample weight. 3148200100044 - Au-197 foil wieght. 3148200100045 STATUS Data were taken from table 2 of Chin. Journ. of Nucl. 3148200100046 Phys., Vol. 19. No. 2, 1997, pp. 110-114. 3148200100047 HISTORY (19970819C) HW 3148200100048 (20030122U) ML:changed reference to journal;additional 3148200100049 small revisions (dates,lower case) 3148200100050 ENDBIB 48 0 3148200100051 NOCOMMON 0 0 3148200100052 ENDSUBENT 51 0 3148200199999 SUBENT 31482002 20030124 00003148200200001 BIB 2 2 3148200200002 REACTION (72-HF-180(N,G)72-HF-181,,SIG) 3148200200003 DECAY-DATA (72-HF-181,1017.36HR,DG,482.,.806) 3148200200004 ENDBIB 2 0 3148200200005 NOCOMMON 0 0 3148200200006 DATA 6 3 3148200200007 EN EN-ERR DATA DATA-ERR MONIT MONIT-ERR 3148200200008 MEV MEV MB MB MB MB 3148200200009 0.52 0.03 36.3 1.8 127.0 4.4 3148200200010 1.10 0.03 45.3 2.7 77.2 3.4 3148200200011 1.60 0.04 39.8 2.4 66.5 2.9 3148200200012 ENDDATA 5 0 3148200200013 ENDSUBENT 12 0 3148200299999 ENDENTRY 2 0 3148299999999