ENTRY C1917 20120613 C122C191700000001 SUBENT C1917001 20120613 C122C191700100001 BIB 13 64 C191700100002 TITLE The 18O(p,alpha)15N cross section at low energies C191700100003 AUTHOR (H.-B.Mak,H.C.Evans,G.T.Ewan,J.D.Macarthur) C191700100004 INSTITUTE (1CANQU) C191700100005 REFERENCE (J,NP/A,304,(1),210,1978) C191700100006 #doi:10.1016/0375-9474(78)90104-5 C191700100007 FACILITY (VDG,1CANQU) C191700100008 SAMPLE Al2O3 target enriched in 18O (>90% of 18O) were C191700100009 produced by evaporating aluminum oxide onto 7 C191700100010 microgram/cm2 carbon foils on glass slides. C191700100011 DETECTOR (SIBAR) C191700100012 PART-DET (A,P) C191700100013 METHOD (ASPEC) Five silicon surface-barrier detectors were C191700100014 used in the measurement. A detector at theta=157 C191700100015 degrees was used to monitor the incident beam C191700100016 energies and for normalizing O-18(n,alpha)N-15 C191700100017 yields. The other detectors were mounted on a movable C191700100018 plate, and subtended a solid angle of approximately C191700100019 11.1 msr. In the energy range of 550 keV < Ep< 235 C191700100020 keV, a 3.05 micrometer thick Ni foil was placed in C191700100021 front of each of the four movable counters to stop C191700100022 the elastically scattered protons. At low proton C191700100023 energies, charge collection after transmission C191700100024 through the target foils was found to be unreliable, C191700100025 probably due to scattering and charge exchange. Hence C191700100026 the absolute cross sections were deduced from the C191700100027 W(p,p)W elastic cross sections which were assumed to C191700100028 be pure Rutherford. The solid angles of the movable C191700100029 detectors relative to that of the monitor detector C191700100030 were measured by means of the W(p,p)W reaction at 2 C191700100031 MeV, by placing the detectors, one at a time, at the C191700100032 same backward angle as the monitor detector. The C191700100033 results agreed with geometrically estimated values. C191700100034 Only the measured relative solid angle values C191700100035 were used in calculating cross sections. C191700100036 ANALYSIS The data were analyzed using the R-matrix theory. C191700100037 Since the entrance and exit channels have spin and C191700100038 parity 1/2+ and 1/2-, respectively, for a resonance C191700100039 with well-defined spin and parity Jpi, only one C191700100040 l-value is allowed for each channel. The values for C191700100041 the boundary conditions and the interaction radii are C191700100042 arbitrary insofar as small changes in their values C191700100043 can be compensated for by appropriate changes in the C191700100044 level parameters without affecting the calculated C191700100045 cross sections. The data were fitted with sums of C191700100046 Legendre polynomials and the total cross sections C191700100047 were obtained. In fitting the total cross section, C191700100048 the contribution from the resonance at E(cm)=314.5 C191700100049 keV was neglected. The level parameters for the 1/2+ C191700100050 resonance at Ep=846 keV and the 3/2- resonance at C191700100051 Ep=629.5 keV have been determined very accurately by C191700100052 Yagi et al. and the reported values were used in the C191700100053 calculation. In addition a broad 1/2+ resonance at C191700100054 650 keV and a broad 1/2- resonance at 750 keV were C191700100055 introduced. The parameters of these two resonances C191700100056 were adjusted to fit the O-18(p,alpha)N-15 cross C191700100057 section as well as previously published data. C191700100058 ERR-ANALYS (DATA-ERR) No explicit procedure is given. C191700100059 (ERR-S,,10.) Counting statistics was kept below 10%. C191700100060 (ERR-SYS,,4.) The overall uncertainty in the C191700100061 experimental values of the products C191700100062 (Nw/N18)dsigma(theta0)/dsigma9theta1) is estimated to C191700100063 be 4% or less. C191700100064 MONITOR (74-W-0(P,EL)74-W-0,,DA) C191700100065 HISTORY (20120613C) BP C191700100066 ENDBIB 64 0 C191700100067 NOCOMMON 0 0 C191700100068 ENDSUBENT 67 0 C191700199999 SUBENT C1917002 20120613 C122C191700200001 BIB 3 9 C191700200002 REACTION (8-O-18(P,A)7-N-15,,SIG) C191700200003 STATUS (CURVE) Fig.4, page 215. C191700200004 (DEP,C1917003) C191700200005 (DEP,C1917004) C191700200006 (DEP,C1917005) C191700200007 (DEP,C1917006) C191700200008 (DEP,C1917007) C191700200009 (DEP,C1917008) C191700200010 ANALYSIS (INTAD) C191700200011 ENDBIB 9 0 C191700200012 NOCOMMON 0 0 C191700200013 DATA 3 76 C191700200014 EN-CM DATA DATA-ERR C191700200015 KEV MB MB C191700200016 2.233E+02 3.277E-02 4.344E-03 C191700200017 2.332E+02 5.387E-02 8.542E-03 C191700200018 2.439E+02 6.398E-02 7.562E-03 C191700200019 2.538E+02 8.160E-02 9.358E-03 C191700200020 2.629E+02 1.030E-01 1.182E-02 C191700200021 2.741E+02 1.425E-01 1.377E-02 C191700200022 2.814E+02 1.912E-01 1.492E-02 C191700200023 2.857E+02 1.912E-01 1.618E-02 C191700200024 2.908E+02 2.226E-01 1.528E-02 C191700200025 2.960E+02 2.565E-01 2.710E-02 C191700200026 3.012E+02 3.142E-01 2.743E-02 C191700200027 3.046E+02 3.141E-01 2.746E-02 C191700200028 3.093E+02 3.887E-01 C191700200029 3.132E+02 5.834E-01 C191700200030 3.193E+02 5.600E-01 C191700200031 3.193E+02 5.600E-01 C191700200032 3.227E+02 5.162E-01 C191700200033 3.283E+02 6.010E-01 C191700200034 3.330E+02 6.386E-01 C191700200035 3.390E+02 7.359E-01 C191700200036 3.425E+02 8.227E-01 C191700200037 3.485E+02 8.653E-01 C191700200038 3.528E+02 9.383E-01 C191700200039 3.562E+02 1.173E+00 C191700200040 3.605E+02 1.149E+00 C191700200041 3.652E+02 1.259E+00 C191700200042 3.713E+02 1.481E+00 C191700200043 3.751E+02 1.622E+00 C191700200044 3.807E+02 1.706E+00 C191700200045 3.855E+02 1.926E+00 C191700200046 3.902E+02 2.132E+00 C191700200047 3.958E+02 2.383E+00 C191700200048 4.001E+02 2.664E+00 C191700200049 4.044E+02 2.860E+00 C191700200050 4.087E+02 3.133E+00 C191700200051 4.134E+02 3.502E+00 C191700200052 4.181E+02 3.996E+00 C191700200053 4.220E+02 4.118E+00 C191700200054 4.280E+02 4.604E+00 C191700200055 4.323E+02 5.147E+00 C191700200056 4.375E+02 5.581E+00 C191700200057 4.409E+02 6.114E+00 C191700200058 4.482E+02 6.834E+00 C191700200059 4.517E+02 7.718E+00 C191700200060 4.555E+02 8.118E+00 C191700200061 4.607E+02 9.075E+00 C191700200062 4.646E+02 1.004E+01 C191700200063 4.706E+02 1.100E+01 C191700200064 4.749E+02 1.217E+01 C191700200065 4.796E+02 1.361E+01 C191700200066 4.831E+02 1.461E+01 C191700200067 4.891E+02 1.667E+01 C191700200068 4.947E+02 1.753E+01 C191700200069 4.990E+02 1.940E+01 C191700200070 5.028E+02 2.169E+01 C191700200071 5.076E+02 2.376E+01 C191700200072 5.119E+02 2.629E+01 C191700200073 5.183E+02 2.880E+01 3.044E+00 C191700200074 5.274E+02 3.864E+01 3.379E+00 C191700200075 5.458E+02 5.235E+01 5.055E+00 C191700200076 5.656E+02 7.693E+01 8.133E+00 C191700200077 5.751E+02 7.847E+01 7.582E+00 C191700200078 5.845E+02 1.001E+02 C191700200079 5.858E+02 1.108E+02 C191700200080 5.888E+02 1.303E+02 C191700200081 5.919E+02 2.016E+02 C191700200082 5.923E+02 2.231E+02 C191700200083 5.941E+02 2.470E+02 C191700200084 5.970E+02 1.995E+02 C191700200085 5.975E+02 2.323E+02 C191700200086 5.983E+02 1.679E+02 C191700200087 6.000E+02 1.441E+02 C191700200088 6.017E+02 1.289E+02 C191700200089 6.219E+02 1.577E+02 1.524E+01 C191700200090 6.404E+02 1.762E+02 1.376E+01 C191700200091 6.601E+02 2.157E+02 2.280E+01 C191700200092 ENDDATA 78 0 C191700200093 ENDSUBENT 92 0 C191700299999 SUBENT C1917003 20120613 C122C191700300001 BIB 2 2 C191700300002 REACTION (8-O-18(P,A)7-N-15,,DA) C191700300003 STATUS (CURVE) Fig.5, page 216. C191700300004 ENDBIB 2 0 C191700300005 COMMON 1 3 C191700300006 EN-CM C191700300007 KEV C191700300008 661.0 C191700300009 ENDCOMMON 3 0 C191700300010 DATA 3 4 C191700300011 COS-CM DATA-CM DATA-ERR C191700300012 NO-DIM MB/SR MB/SR C191700300013 -8.746E-01 1.607E+01 7.477E-01 C191700300014 -5.175E-01 1.708E+01 1.121E+00 C191700300015 -3.700E-02 1.696E+01 1.214E+00 C191700300016 4.709E-01 1.563E+01 1.121E+00 C191700300017 ENDDATA 6 0 C191700300018 ENDSUBENT 17 0 C191700399999 SUBENT C1917004 20120613 C122C191700400001 BIB 2 2 C191700400002 REACTION (8-O-18(P,A)7-N-15,,DA) C191700400003 STATUS (CURVE) Fig.5, page 216. C191700400004 ENDBIB 2 0 C191700400005 COMMON 1 3 C191700400006 EN-CM C191700400007 KEV C191700400008 596.0 C191700400009 ENDCOMMON 3 0 C191700400010 DATA 3 4 C191700400011 COS-CM DATA-CM DATA-ERR C191700400012 NO-DIM MB/SR MB/SR C191700400013 -8.899E-01 3.336E+01 9.160E-01 C191700400014 -5.229E-01 2.237E+01 1.069E+00 C191700400015 -4.587E-02 1.473E+01 1.374E+00 C191700400016 4.679E-01 1.168E+01 1.374E+00 C191700400017 ENDDATA 6 0 C191700400018 ENDSUBENT 17 0 C191700499999 SUBENT C1917005 20120613 C122C191700500001 BIB 2 2 C191700500002 REACTION (8-O-18(P,A)7-N-15,,DA) C191700500003 STATUS (CURVE) Fig.5, page 216. C191700500004 ENDBIB 2 0 C191700500005 COMMON 1 3 C191700500006 EN-CM C191700500007 KEV C191700500008 518.0 C191700500009 ENDCOMMON 3 0 C191700500010 DATA 3 8 C191700500011 COS-CM DATA-CM DATA-ERR C191700500012 NO-DIM MB/SR MB/SR C191700500013 -8.670E-01 3.417E+00 1.703E-01 C191700500014 -6.564E-01 3.072E+00 1.705E-01 C191700500015 -4.962E-01 2.837E+00 1.393E-01 C191700500016 -1.803E-01 2.398E+00 1.393E-01 C191700500017 7.617E-02 2.069E+00 1.548E-01 C191700500018 4.241E-01 1.583E+00 1.240E-01 C191700500019 6.576E-01 1.207E+00 1.085E-01 C191700500020 8.638E-01 1.064E+00 9.302E-02 C191700500021 ENDDATA 10 0 C191700500022 ENDSUBENT 21 0 C191700599999 SUBENT C1917006 20120613 C122C191700600001 BIB 2 2 C191700600002 REACTION (8-O-18(P,A)7-N-15,,DA) C191700600003 STATUS (CURVE) Fig.5, page 216. C191700600004 ENDBIB 2 0 C191700600005 COMMON 1 3 C191700600006 EN-CM C191700600007 KEV C191700600008 421.0 C191700600009 ENDCOMMON 3 0 C191700600010 DATA 3 8 C191700600011 COS-CM DATA-CM DATA-ERR C191700600012 NO-DIM MB/SR MB/SR C191700600013 -8.834E-01 5.466E-01 2.096E-02 C191700600014 -6.588E-01 4.609E-01 2.559E-02 C191700600015 -4.985E-01 4.238E-01 3.259E-02 C191700600016 -1.822E-01 3.126E-01 2.793E-02 C191700600017 6.981E-02 2.547E-01 2.558E-02 C191700600018 4.316E-01 2.017E-01 2.328E-02 C191700600019 6.471E-01 1.112E-01 1.862E-02 C191700600020 8.715E-01 8.822E-02 2.095E-02 C191700600021 ENDDATA 10 0 C191700600022 ENDSUBENT 21 0 C191700699999 SUBENT C1917007 20120613 C122C191700700001 BIB 2 2 C191700700002 REACTION (8-O-18(P,A)7-N-15,,DA) C191700700003 STATUS (CURVE) Fig.5, page 216. C191700700004 ENDBIB 2 0 C191700700005 COMMON 1 3 C191700700006 EN-CM C191700700007 KEV C191700700008 309.0 C191700700009 ENDCOMMON 3 0 C191700700010 DATA 3 8 C191700700011 COS-CM DATA-CM DATA-ERR C191700700012 NO-DIM MB/SR MB/SR C191700700013 -8.872E-01 6.030E-02 2.002E-03 C191700700014 -6.584E-01 5.092E-02 2.510E-03 C191700700015 -4.983E-01 4.500E-02 2.506E-03 C191700700016 -1.833E-01 3.666E-02 2.254E-03 C191700700017 7.818E-02 2.229E-02 2.751E-03 C191700700018 4.200E-01 1.671E-02 2.254E-03 C191700700019 6.579E-01 7.586E-03 2.508E-03 C191700700020 8.673E-01 5.442E-03 2.011E-03 C191700700021 ENDDATA 10 0 C191700700022 ENDSUBENT 21 0 C191700799999 SUBENT C1917008 20120613 C122C191700800001 BIB 2 2 C191700800002 REACTION (8-O-18(P,A)7-N-15,,DA) C191700800003 STATUS (CURVE) Fig.5, page 216. C191700800004 ENDBIB 2 0 C191700800005 COMMON 1 3 C191700800006 EN-CM C191700800007 KEV C191700800008 223.0 C191700800009 ENDCOMMON 3 0 C191700800010 DATA 3 8 C191700800011 COS-CM DATA-CM DATA-ERR C191700800012 NO-DIM MB/SR MB/SR C191700800013 -8.839E-01 6.391E-03 1.039E-03 C191700800014 -6.545E-01 3.823E-03 7.014E-04 C191700800015 -5.041E-01 4.604E-03 6.493E-04 C191700800016 -1.927E-01 2.348E-03 6.236E-04 C191700800017 7.225E-02 1.988E-03 5.198E-04 C191700800018 4.330E-01 1.837E-03 6.236E-04 C191700800019 6.481E-01 8.266E-04 4.679E-04 C191700800020 8.721E-01 1.282E-04 3.373E-04 C191700800021 ENDDATA 10 0 C191700800022 ENDSUBENT 21 0 C191700899999 SUBENT C1917009 20120613 C122C191700900001 BIB 3 8 C191700900002 REACTION (8-O-18(P,A)7-N-15,,SIG,,SFC) C191700900003 STATUS (CURVE) Fig.6 of Nucl.Phys.A304(1978)210 C191700900004 (DEP,C1917002) Fig.5, page 216. C191700900005 ANALYSIS The S-function (factor) is defined by: S=E sigma(E) C191700900006 exp(2pi/eta), where eta=Z1 Z2 e2/hbar v. Below 300 keV,C191700900007 this S-function is approximated by: S(E)=S0 + S1E + C191700900008 1/2S2E2, where S0=46 MeV b, S1 = 13 b and S2 = 160 C191700900009 MeV-1 b. C191700900010 ENDBIB 8 0 C191700900011 NOCOMMON 0 0 C191700900012 DATA 3 72 C191700900013 EN-CM DATA DATA-ERR C191700900014 KEV MB*MEV MB*MEV C191700900015 2.276E+02 8.663E+04 6.787E+03 C191700900016 2.367E+02 1.133E+05 1.008E+04 C191700900017 2.450E+02 9.907E+04 7.771E+03 C191700900018 2.542E+02 9.793E+04 7.146E+03 C191700900019 2.633E+02 9.909E+04 6.695E+03 C191700900020 2.725E+02 1.014E+05 4.619E+03 C191700900021 2.816E+02 1.140E+05 5.197E+03 C191700900022 2.875E+02 1.051E+05 4.785E+03 C191700900023 2.958E+02 1.120E+05 C191700900024 3.024E+02 1.252E+05 C191700900025 3.024E+02 1.252E+05 C191700900026 3.074E+02 1.140E+05 C191700900027 3.107E+02 1.281E+05 C191700900028 3.157E+02 1.786E+05 C191700900029 3.198E+02 1.544E+05 C191700900030 3.298E+02 1.407E+05 C191700900031 3.298E+02 1.407E+05 C191700900032 3.357E+02 1.327E+05 C191700900033 3.398E+02 1.448E+05 C191700900034 3.456E+02 1.544E+05 C191700900035 3.556E+02 1.509E+05 C191700900036 3.581E+02 1.696E+05 C191700900037 3.664E+02 1.628E+05 C191700900038 3.723E+02 1.696E+05 C191700900039 3.772E+02 1.808E+05 C191700900040 3.789E+02 1.638E+05 C191700900041 3.831E+02 1.746E+05 C191700900042 3.847E+02 1.840E+05 C191700900043 3.930E+02 1.895E+05 C191700900044 3.972E+02 2.020E+05 C191700900045 4.055E+02 2.068E+05 C191700900046 4.121E+02 2.193E+05 C191700900047 4.196E+02 2.537E+05 C191700900048 4.329E+02 2.753E+05 C191700900049 4.329E+02 2.537E+05 C191700900050 4.404E+02 2.769E+05 C191700900051 4.454E+02 2.935E+05 C191700900052 4.504E+02 3.076E+05 C191700900053 4.545E+02 3.223E+05 C191700900054 4.603E+02 3.377E+05 C191700900055 4.653E+02 3.477E+05 C191700900056 4.686E+02 4.046E+05 C191700900057 4.695E+02 3.707E+05 C191700900058 4.769E+02 4.023E+05 C191700900059 4.819E+02 4.264E+05 C191700900060 4.869E+02 4.442E+05 C191700900061 4.911E+02 4.682E+05 C191700900062 4.969E+02 4.877E+05 C191700900063 4.994E+02 5.230E+05 C191700900064 5.077E+02 5.449E+05 C191700900065 5.135E+02 5.810E+05 C191700900066 5.176E+02 6.123E+05 C191700900067 5.218E+02 6.529E+05 C191700900068 5.317E+02 8.054E+05 C191700900069 5.508E+02 9.319E+05 C191700900070 5.691E+02 1.191E+06 C191700900071 5.791E+02 1.137E+06 C191700900072 5.890E+02 1.418E+06 C191700900073 5.890E+02 1.418E+06 C191700900074 5.890E+02 1.418E+06 C191700900075 5.932E+02 1.709E+06 C191700900076 5.940E+02 1.495E+06 C191700900077 5.964E+02 3.062E+06 C191700900078 5.973E+02 2.121E+06 C191700900079 5.973E+02 1.632E+06 C191700900080 6.014E+02 2.940E+06 C191700900081 6.031E+02 2.397E+06 C191700900082 6.081E+02 1.730E+06 C191700900083 6.115E+02 1.539E+06 C191700900084 6.281E+02 1.661E+06 C191700900085 6.489E+02 1.642E+06 C191700900086 6.680E+02 1.761E+06 C191700900087 ENDDATA 74 0 C191700900088 ENDSUBENT 87 0 C191700999999 SUBENT C1917010 20120613 C122C191701000001 BIB 5 12 C191701000002 REACTION 1(8-O-18(P,0),,EN) C191701000003 2(8-O-18(P,0),,J) C191701000004 3(8-O-18(P,0),,PTY) C191701000005 4(8-O-18(P,EL),,WID) C191701000006 5(8-O-18(P,A),,WID) C191701000007 STATUS (TABLE) Table 1, page 217. C191701000008 FLAG (1.) The 1/2- level at Ep=0.75 MeV is introduced as a C191701000009 "background level" only. The extrapolated results are C191701000010 insensitive to the parameters of this 1/2- level. C191701000011 REL-REF (R,E1976001,K.Yagi+,J,JPJ,17,595,1962) C191701000012 COMMENT The previously published by K.Yagi et al. parameters C191701000013 for 0.846 and 0.6295 keV levels were not compiled. C191701000014 ENDBIB 12 0 C191701000015 NOCOMMON 0 0 C191701000016 DATA 6 2 C191701000017 DATA 1DATA 2DATA 3DATA 4DATA 5FLAG C191701000018 MEV NO-DIM NO-DIM MEV MEV NO-DIM C191701000019 0.650 0.5 1.0 0.0055 0.160 C191701000020 0.750 0.5 -1.0 0.0032 1.06 1.C191701000021 ENDDATA 4 0 C191701000022 ENDSUBENT 21 0 C191701099999 ENDENTRY 10 0 C191799999999