ENTRY M0627 20240329 M130M0627 0 1 SUBENT M0627001 20240329 M130M0627 1 1 BIB 14 69 M0627 1 2 TITLE High Resolution Measurement of the M0627 1 3 16O(gamma,pn)14N(0,1,2,...) Reaction. M0627 1 4 AUTHOR (K.R.Garrow,F.Adimi,N.R.Kolb,J.Lu,R.E.Piwell, M0627 1 5 D.M.Scopik, J.M.Vogt,J.W.Jury,A.Kuzin,M.N.Thompson, M0627 1 6 J.Ryckebusch) M0627 1 7 REFERENCE (J,PR/C,64,064602,2001) M0627 1 8 INSTITUTE (3AULAML,2BLGGHT) M0627 1 9 (1CANSAS) Trent University, Peterborough, Ontario, M0627 1 10 Canada. M0627 1 11 FACILITY (ESTRG,1CANSAS) SAL pulse stretcher ring with duty M0627 1 12 factor of approximately 80%. M0627 1 13 INC-SOURCE (TAGD) Tagged photon spectrometer: E(G) = 98.5 - 141.0 M0627 1 14 MeV, efficiency about 53%. M0627 1 15 SAMPLE 1 mm thick Al frames with 7.6 micron Kapton windows M0627 1 16 contained heavy water (93% D2O, 7% DO. M0627 1 17 PART-DET (N,P) M0627 1 18 DETECTOR (SCIN,CSICR) M0627 1 19 Protons were detected in high resolution E-dE M0627 1 20 telescopes. The dE detectors consisted of 2.0 mm M0627 1 21 thick NE102A plastic scintillators. The E detectors M0627 1 22 were CsI(Tl) scintillation crystals 7.61 cm in M0627 1 23 diameter and 7.61 cm in length. M0627 1 24 The neutron energy was measured by a time-of-flight M0627 1 25 (TOF) method where the typical flight distances were M0627 1 26 about 7 m. The neutron detector consisted of an array M0627 1 27 of ten BC400 plastic scintillator bars, with M0627 1 28 dimensions 1.5 m x 0.15 m x 76 mm (thick), which were M0627 1 29 METHOD (COINC,EDE,TOF) M0627 1 30 ANALYSIS Direct measurement. M0627 1 31 COMMENT The exclusive 16O(G,PN)14N-0,1,2,... reaction was M0627 1 32 measured for the photon energy range E(G) = 98.5 - M0627 1 33 141.0 MeV with an excitation energy resolution of 2.8 M0627 1 34 MeV. Protons were detected at 76 and 82 degrees and M0627 1 35 coincident neutrons were detected at the opening M0627 1 36 angle for quasifree deuteron photodisintegration. M0627 1 37 Only the T = 0, 1+, 3.95 MeV state in the residual M0627 1 38 14N nucleus was significantly populated. This M0627 1 39 corresponds to a preferred l = 0 angular momentum M0627 1 40 transfer to the recoil as is expected for quasifree M0627 1 41 kinematics. The absence of significant population to M0627 1 42 other discrete states is evidence that absorption on M0627 1 43 correlated proton-neutron pairs with an angular M0627 1 44 momentum transfer of l >= 2 is largely suppressed for M0627 1 45 the low recoil momentum range of the current M0627 1 46 measurement. As a consequence of this fact, and the M0627 1 47 absence of unnatural parity states, only absorption M0627 1 48 on proton-neutron pairs in relative motion l = 0, 2 M0627 1 49 is expected for all possible shell model coupling. No M0627 1 50 significant population of the T = 1 state at 2.31 MeV M0627 1 51 is consistent with previous measurement demonstrating M0627 1 52 that absorption on proton-neutron pairs in an isospin M0627 1 53 triplet is suppressed. The results of the measurement M0627 1 54 to discrete states in the residual 14N nucleus are M0627 1 55 compared to microscopic calculations which include M0627 1 56 contributions above that the mean field due to the M0627 1 57 short range and tensor parts of the nuclear M0627 1 58 potential. Clear separation in the contribution of M0627 1 59 (1p)**-2 and (1p)**-1 (1s)**-1 continuum above 20 MeV M0627 1 60 indicates that absorption on l = 1 nucleon pairs is M0627 1 61 also important near quasifree kinematics. M0627 1 62 CRITIQUE Data for ANG1 and ANG2 are slightly different in M0627 1 63 Table 2 and Table in Fig. 1 (insert). M0627 1 64 HISTORY (20020404C) M0627 1 65 (20040811A) Energy added to subentry 1 COMMON. Angle M0627 1 66 headings corrected. ERR-ANALYS moved to subentry 2. M0627 1 67 (20240329A) Corrected by V.Varlamov: TITLE, lowercase, M0627 1 68 INSTITUTE, INC-SOURCE, PART-DET, DETECTOR, ERR-ANALYS,M0627 1 69 REACTION, DATA-UNITS in SUBENTs 003 and 004, DATA, M0627 1 70 STATUS. M0627 1 71 ENDBIB 69 0 M0627 1 72 COMMON 3 3 M0627 1 73 EN-MIN EN-MAX EN-RSL-FW M0627 1 74 MEV MEV MEV M0627 1 75 98.5 141. 2.8 M0627 1 76 ENDCOMMON 3 0 M0627 1 77 ENDSUBENT 76 0 M0627 199999 SUBENT M0627002 20240329 M130M0627 2 1 BIB 7 18 M0627 2 2 REACTION (8-O-16(G,N+P)7-N-14,PAR,DA/DA,N/P) M0627 2 3 EN-SEC (E-LVL,7-N-14) M0627 2 4 ANG-SEC (ANG1,N) M0627 2 5 (ANG2,P) M0627 2 6 ERR-ANALYS (DATA-ERR) The errors stated with the measured cross M0627 2 7 sections are statistical in nature and are also meant M0627 2 8 to reflect the error in the peak fitting procedure M0627 2 9 and the error in the random background subtraction. M0627 2 10 FLAG (1.) Angle of neutron TOF detector is 77 degree and M0627 2 11 that of proton E-dE detector is 82 degree. M0627 2 12 (2.) Angle of neutron TOF detector is 83 degree and M0627 2 13 that of proton E-dE detector is 76 degree. M0627 2 14 STATUS (TABLE,,K.R.Garrow+,J,PR/C,64,064602,2001) M0627 2 15 Data from the Table 2. M0627 2 16 HISTORY (20240329A) Corrected by V.Varlamov: EN-SEC (E-EXC -> M0627 2 17 E-LVL), ERR-ANALYS, DATA-HEAD, FLAG, DATA substituted M0627 2 18 (76 -> 77) and (82 -> 83) in accordance with DATA of M0627 2 19 Table in Fig. 1 (insert), STATUS. M0627 2 20 ENDBIB 18 0 M0627 2 21 COMMON 1 3 M0627 2 22 E-LVL M0627 2 23 MEV M0627 2 24 3.95 M0627 2 25 ENDCOMMON 3 0 M0627 2 26 DATA 5 2 M0627 2 27 ANG1 ANG2 DATA DATA-ERR FLAG M0627 2 28 ADEG ADEG MUB/SR2 MUB/SR2 NO-DIM M0627 2 29 77. 82. 6.89 .64 1. M0627 2 30 83. 76. 8.82 .74 2. M0627 2 31 ENDDATA 4 0 M0627 2 32 ENDSUBENT 31 0 M0627 299999 SUBENT M0627003 20240329 M130M0627 3 1 BIB 7 17 M0627 3 2 REACTION (8-O-16(G,N+P)7-N-14,PAR,DA/DA,N/P) M0627 3 3 EN-SEC (E-EXC,7-N-14) M0627 3 4 ANG-SEC (ANG1,N) M0627 3 5 (ANG2,P) M0627 3 6 ERR-ANALYS No information. M0627 3 7 FLAG (1.) Angle of neutron TOF detector is 77 degree and M0627 3 8 that of proton E-dE detector is 82 degree. M0627 3 9 (2.) Angle of neutron TOF detector is 83 degree and M0627 3 10 that of proton E-dE detector is 76 degree. M0627 3 11 STATUS (TABLE,,K.R.Garrow+,J,PR/C,64,064602,2001) M0627 3 12 Data from the Table 2. M0627 3 13 HISTORY (20040811A) REACTION, energy headings corrected. M0627 3 14 (20240329A) Corrected by V.Varlamov: REACTION, EN-SEC, M0627 3 15 ERR-ANALYS, DATA-UNIT, FLAG, SUBENTs 003 and 004 M0627 3 16 merged, DATA substituted, angle data (82->83) and M0627 3 17 (76->77) substituted in accordance with DATA of Table M0627 3 18 in Fig. 1 (insert), STATUS. M0627 3 19 ENDBIB 17 0 M0627 3 20 NOCOMMON 0 0 M0627 3 21 DATA 6 6 M0627 3 22 E-EXC-MIN E-EXC-MAX ANG1 ANG2 DATA FLAG M0627 3 23 MEV MEV ADEG ADEG MUB/SR2 NO-DIM M0627 3 24 0. 20. 77. 82. 682. 1. M0627 3 25 0. 20. 83. 76. 563. 2. M0627 3 26 20. 45. 77. 82. 2329. 1. M0627 3 27 20. 45. 83. 76. 2143. 2. M0627 3 28 45. 70. 77. 82. 1601. 1. M0627 3 29 45. 70. 83. 76. 1648. 2. M0627 3 30 ENDDATA 8 0 M0627 3 31 ENDSUBENT 30 0 M0627 399999 NOSUBENT M0627004 20240329 M130M0627 4 1 ENDENTRY 4 0 M062799999999