ENTRY 23303 20160920 22542330300000001 SUBENT 23303001 20160920 22542330300100001 BIB 16 57 2330300100002 TITLE A neutron source to measure stellar neutron capture 2330300100003 cross sections at kT= 5 keV . 2330300100004 AUTHOR (M.Heil, S.Dababneh, F.Kaeppeler,R.Plag,A.Juseviciute, 2330300100005 N.Winckler, R.Reifarth, S.O'Brien) 2330300100006 INSTITUTE (2GERKFK) M.Heil, S.Dababneh, F.Kaeppeler,R.Plag, 2330300100007 A.Juseviciute, N.Winckler 2330300100008 (1USALAS) R.Reifarth 2330300100009 (1USANOT) S.O'Brien 2330300100010 REFERENCE (J,NP/A,758,529C,2005) MACS prelim. value . 2330300100011 FACILITY (VDG,2GERKFK) 3.7-MV Van de Graaff accelerator. 2330300100012 MONITOR ((MONIT)79-AU-197(N,G)79-AU-198-G,,SIG,,MXW) 2330300100013 At kT=30keV. 2330300100014 With normalization factor 0.954 the MACS =2028 mb at 2330300100015 kT=51.1 keV . 2330300100016 MONIT-REF (22099001,W.Ratynski+,J,PR/C,37,595,1988) 2330300100017 INC-SOURCE 8-O-18(P,N)9-F-18 reaction, 2330300100018 0.2-mm-thick tantalum disk with an oxide layer of 2330300100019 2.E-6 m thickness, with 95% in O-18 enrichment. 2330300100020 Proton energy was 2582 keV. 2330300100021 INC-SPECT Quasi-Maxwellian neutron energy spectrum with 2330300100022 temperature kT=5.1 +- 0.1 keV 2330300100023 REL-REF (O,O1962002,M.Heil+,J,PR/C,71,025803,2005) 2330300100024 Neutron spectrum from O-18(P,N)F-18 reaction. 2330300100025 (O,23046001,M.Heil+,J,NP/A,758,529C,2005) Lu data 2330300100026 (O,22885001,M.Heil+,J,NP/A,758,529C,2005) Ba data 2330300100027 METHOD (ACTIV) 2330300100028 (TOF) For neutron spectrum determination 2330300100029 SAMPLE Natural, metallic lanthanum disks of 15 mm diameter, 2330300100030 1 mm thickness . 2330300100031 Sandwiched between two 0.06 mm thick gold foils of 2330300100032 the same diameter. 2330300100033 DETECTOR (HPGE) System of two Clover type HPGe detectors placed 2330300100034 face-to-face in close geometry- to measure induced 2330300100035 activities. 2330300100036 (GLASD) 2330300100037 1. Movable Li-6 glass detector for neutron 2330300100038 angular distribution from 0 to 80 in steps 10 deg; 2330300100039 located at 222mm distance from the O-18 target; 2330300100040 covered 9.8 deg angle. 2330300100041 2. A stationary neutron monitor was positioned 300mm 2330300100042 from the O-18 target at an angle of 40 deg, served 2330300100043 for normalizing the individual spectra taken with 2330300100044 the movable detector. 2330300100045 3. Throughout the irradiations the neutron flux was 2330300100046 monitored in steps of 60 s by means of a 6Li glass 2330300100047 detector at 1 m distance from the target. 2330300100048 CORRECTION For the neutron efficiency of the 6Li glass detector 2330300100049 assuming a 1/v behavior of the efficiency in the 2330300100050 considered energy range below 40 keV. 2330300100051 For solid angle. 2330300100052 Corrections due to variations in the neutron flux 2330300100053 and for the decay of activated nuclei during the 2330300100054 irradiations. 2330300100055 COMMENT This work was partly supported by the Joint Institute 2330300100056 for Nuclear Astrophysics (JINA) through NSF Grants 2330300100057 Nos. PHY-0072711 and PHY-0228206. 2330300100058 HISTORY (20160920C) M.M. 2330300100059 ENDBIB 57 0 2330300100060 COMMON 5 3 2330300100061 KT KT-ERR KT-NRM MONIT MONIT-ERR 2330300100062 KEV KEV KEV MB MB 2330300100063 5.1 0.1 30. 582. 9. 2330300100064 ENDCOMMON 3 0 2330300100065 ENDSUBENT 64 0 2330300199999 SUBENT 23303002 20160920 22542330300200001 BIB 4 9 2330300200002 REACTION (57-LA-139(N,G)57-LA-140,,SIG,,MXW) 2330300200003 MACS - /V(thermal) 2330300200004 REL-REF (A,22879001,S.O'Brien+,J,PR/C,68,035801,2003) 2330300200005 104 mb derived from extrapolation of measurement at 2330300200006 25 keV . 2330300200007 ERR-ANALYS (DATA-ERR) Type of uncertainty is not explained in the 2330300200008 article. 2330300200009 STATUS (TABLE) Text, p.532c of NP/A,758,529C,2005 . 2330300200010 (PRELM) Preliminary data . 2330300200011 ENDBIB 9 0 2330300200012 NOCOMMON 0 0 2330300200013 DATA 2 1 2330300200014 DATA DATA-ERR 2330300200015 MB MB 2330300200016 102.3 3.8 2330300200017 ENDDATA 3 0 2330300200018 ENDSUBENT 17 0 2330300299999 ENDENTRY 2 0 2330399999999