ENTRY C1799 20100512 C103C179900000001 SUBENT C1799001 20100512 C103C179900100001 BIB 11 41 C179900100002 TITLE Determination of the E1 component of the low-energy C179900100003 12C(alpha,gamma)16O cross section C179900100004 AUTHOR (X.D.Tang,K.E.Rehm,I.Ahmad,C.R.Brune,A.Champagne, C179900100005 J.P.Greene,A.Hecht,D.J.Henderson, R.V.F.Janssens, C179900100006 C.L.Jiang,L.Jisonna,D.Kahl,E.F.Moore,M.Notani, C179900100007 R.C.Pardo,N.Patel,M.Paul,G.Savard,J.P.Schiffer, C179900100008 R.E.Segel,S.Sinha,A.H.Wuosmaa) C179900100009 INSTITUTE (1USAANL,1USANOT,1USAOHO,1USANCA,1USANWU,1USACSM, C179900100010 3ISLHEB,1USAWMU) C179900100011 REFERENCE (J,PR/C,81,045809,2010) C179900100012 FACILITY (LINAC,1USAANL) C179900100013 DETECTOR (IOCH) Twin ionization chamber was used to detect C179900100014 decay products of beta delayed alpha decay of 16N C179900100015 i.e. alpha particles and 12C ions in coincidence. C179900100016 Incident beam of 16N was energy degraded and stopped C179900100017 in thin carbon foil, mounted on a rotating wheel. C179900100018 The wheel served as a cathode of the twin ionization C179900100019 chamber. After 15 sec irradiation time, the carbon C179900100020 foil was moved on rotating wheel into the twin C179900100021 ionization chamber for coincident measurement of C179900100022 alpha particles and 12C ions. C179900100023 METHOD Indirect measurement of reaction rate, based on C179900100024 measurement of beta-delayed alpha decay of 16N, C179900100025 angular distribution of E1 and E2 alpha capture and C179900100026 of elastic alpha scattering on 12C. In this C179900100027 experiment, beta-delayed alpha decay of 16N was C179900100028 measured. C179900100029 INC-SOURCE Beam of 16N ions was produced by bombarding a deuteriumC179900100030 gas cell cooled to -180 deg C with beam of 15N with C179900100031 energy of 82 MeV. C179900100032 ANALYSIS R-matrix theory was used to obtain reaction rates at C179900100033 300 keV C179900100034 ERR-ANALYS (ERR-1) Systematic uncertainty caused by uncertainty C179900100035 in energy calibration C179900100036 (ERR-2) Systematic uncertainty from beta decay C179900100037 branching ratio (7.117 MeV/9.585 MeV) C179900100038 (ERR-3) Over all normalization of C179900100039 12C(alpha,gamma)16O cross section C179900100040 (ERR-SYS) Total systematic uncertainty C179900100041 (ERR-S) Statistical uncertainty C179900100042 HISTORY (20100512C) Compiled by S.H. C179900100043 ENDBIB 41 0 C179900100044 COMMON 4 3 C179900100045 ERR-1 ERR-2 ERR-3 ERR-SYS C179900100046 B*KEV B*KEV B*KEV B*KEV C179900100047 5.0 2.0 2.0 8.0 C179900100048 ENDCOMMON 3 0 C179900100049 ENDSUBENT 48 0 C179900199999 SUBENT C1799002 20100512 C103C179900200001 BIB 4 6 C179900200002 REACTION 1(6-C-12(A,G)8-O-16,PAR,SIG,,SFC) C179900200003 2(6-C-12(A,G)8-O-16,PAR,SIG,,SFC) C179900200004 STATUS (TABLE) Data taken from tab. 2 of the reference C179900200005 EN-SEC (E-LVL,8-O-16) C179900200006 ANALYSIS 1Channel radius in R-matrix fit 5.5 fm C179900200007 2Channel radius in R-matrix fit 6.5 fm C179900200008 ENDBIB 6 0 C179900200009 COMMON 2 3 C179900200010 E-LVL E-LVL C179900200011 MEV MEV C179900200012 7.117 9.585 C179900200013 ENDCOMMON 3 0 C179900200014 DATA 5 1 C179900200015 EN-CM DATA 1ERR-S 1DATA 2ERR-S 2 C179900200016 KEV B*KEV B*KEV B*KEV B*KEV C179900200017 300.0 86.0 20.0 82.0 25.0 C179900200018 ENDDATA 3 0 C179900200019 ENDSUBENT 18 0 C179900299999 ENDENTRY 2 0 C179999999999