ENTRY C1973 20130116 C126C197300000001 SUBENT C1973001 20130116 C126C197300100001 BIB 14 75 C197300100002 TITLE Intermediate-energy Coulomb excitation of 19Ne C197300100003 AUTHOR (G.Hackman,Sam M.Austin,T.Glasmacher,T.Aumann, C197300100004 B.A.Brown,R.W.Ibbotson,K.Miller,B.Pritychenko, C197300100005 L.A.Riley,B.Roeder,E.Spears) C197300100006 INSTITUTE (1USAKAN,1USAMSU) C197300100007 (1USAUSA) Earlham College, Richmond, Indiana C197300100008 REFERENCE (J,PR/C,61,052801,2000) C197300100009 #doi:10.1103/PhysRevC.61.052801 C197300100010 REL-REF (N,,G.Hackman+,J,NP/A,682,356,2001) C197300100011 FACILITY (CYCLO,1USAMSU) C197300100012 (FRS,1USAMSU) The experiment was performed using the C197300100013 A1200 Fragment Separator(FRS). C197300100014 DETECTOR (COIN,NAICR,SCIN) The experimental apparatus includes C197300100015 NSCL NaI(Tl) array, silicon PIN, TOF and dE/E and C197300100016 tracking detectors. The NSCL NaI(Tl) array consists C197300100017 of 38 detectors, which are arranged in 3 concentric C197300100018 rings, of 11 (inner), 17 (middle) and 10 (outer) C197300100019 detectors, respectively. The radii of the three C197300100020 detector rings are 10.8 cm, 16.9 cm and 21.8 cm, C197300100021 respectively. The crystals are cylindrical, C197300100022 approximately 18.0 cm long and 5.75 cm in diameter C197300100023 and placed into a 0.45 mm thick aluminum shield. A 1 C197300100024 cm thick quartz window is attached to each end. C197300100025 Optical glue was used to connect 5 cm in diameter C197300100026 photomultiplier tubes (PMTs) to each window. To C197300100027 shield the NaI(Tl) detector array from photons C197300100028 originating at the phoswich detector, and natural C197300100029 radioactivity, the entire array was placed into a 16 C197300100030 cm thick lead shield. The phoswich detector has a C197300100031 diameter of 101.6 mm and is made of 100 mm thick. C197300100032 Slow plastic scintillator (Bicron 444) and a thin C197300100033 layer (0.6 mm thick) of fast plastic scintillator C197300100034 (Bicron 400) is glued to it. The detector is viewed C197300100035 through a lightguide by 2 PMTs (THORN EMI C197300100036 ElectronTubes 9807B02). The PMTs were attached by C197300100037 using Tracon F113 epoxy. In addition, a water cooling C197300100038 system was installed to cool down the PMT voltage C197300100039 dividers because the detector operates in a vacuum. C197300100040 PART-DET (G) C197300100041 METHOD (EDE,GSPEC,TOF,COINC,EXTB) C197300100042 ANALYSIS (PGS,INTAD) To determine excitation probabilities, C197300100043 GEANT simulations were performed for the g-rays that C197300100044 were expected to be observed in the experiment. To C197300100045 test the simulations, the efficiency of the array was C197300100046 measured with a standard 88Y source. The decay from a C197300100047 given state was modeled by taking the appropriate C197300100048 linear combinations of the simulated spectra using C197300100049 experimental branching ratios reported for 19Ne. C197300100050 These branching ratios themselves have measurement C197300100051 uncertainties, but the errors are correlated since C197300100052 the sum of the branching ratios must add up to 1. An C197300100053 error in the branching ratios, then, would C197300100054 simultaneously overpredict one branch and C197300100055 underpredict another, the net result being a C197300100056 second-order systematic effect which is much smaller C197300100057 than the statistical uncertainties in our C197300100058 measurement. The normalizations of these summed, C197300100059 simulated spectra for each state were then treated as C197300100060 free parameters in a MINUIT xi2 minimization to best C197300100061 fit the observed g-ray spectrum. A broad Gaussian near C197300100062 5.3 MeV was also required to fit the data; it may C197300100063 describe unresolved decay from Ex>5 MeV states for C197300100064 which little g spectroscopic information is known. C197300100065 All cross sections are corrected for photon angular C197300100066 acceptance bias by integrating the angular C197300100067 distributions calculated for the dominant peak in the C197300100068 deexcitation spectrum. C197300100069 ERR-ANALYS (DATA-ERR) Statistical and systematical uncertainties C197300100070 were reported separately in some cases. C197300100071 (ERR-1,,13.) insufficient knowledge of branching ratio C197300100072 for deexcitation of 1.536 MeV state. C197300100073 COMMENT Only positively identified transitions from the 1.536, C197300100074 1.616 and 4.6 MeV levels were compiled. C197300100075 STATUS (APRVD) Approved by authors. C197300100076 HISTORY (20130116C) BP C197300100077 ENDBIB 75 0 C197300100078 COMMON 3 3 C197300100079 THICKNESS EN EN-ERR C197300100080 G/CM-SQ MEV/A MEV/A C197300100081 0.518 55.0 0.3 C197300100082 ENDCOMMON 3 0 C197300100083 ENDSUBENT 82 0 C197300199999 SUBENT C1973002 20130116 C126C197300200001 BIB 5 11 C197300200002 REACTION (79-AU-197(10-NE-19,INL)79-AU-197,PAR,SIG) C197300200003 EN-SEC (E-LVL,10-NE-19) C197300200004 STATUS (TABLE) Table 1, page 052801-3. C197300200005 COMMENT Cross sections determined by measuring gammas at an C197300200006 angle(CM) between 0 and 5.0 deg. The gammas being C197300200007 produced by inelastic scattering of Ne-19 on Au-197, C197300200008 leaving Ne-19 at the excited level of 1536, 1616 and C197300200009 4600 keV. C197300200010 FLAG (1.) Luck of knowledge of mixing ratios for C197300200011 deexcitation of 1.536 MeV state may introduce a C197300200012 systematic +-13% cross section uncertainty. C197300200013 ENDBIB 11 0 C197300200014 NOCOMMON 0 0 C197300200015 DATA 4 3 C197300200016 E-LVL DATA DATA-ERR FLAG C197300200017 KEV MB MB NO-DIM C197300200018 1536.0 23.6 0.3 1. C197300200019 1616.0 2.1 0.3 C197300200020 4600.0 4.2 0.3 C197300200021 ENDDATA 5 0 C197300200022 ENDSUBENT 21 0 C197300299999 ENDENTRY 2 0 C197399999999