ENTRY M0627 20040811 M037M062700000001 SUBENT M0627001 20040811 M037M062700100001 BIB 13 59 M062700100002 INSTITUTE (1CANSAS,3AULAML,2BLGBLG),TRENT UNIVERSITY, M062700100003 PETERBOROUGH, ONTARIO, CANADA M062700100004 REFERENCE (J,PR/C,64,064602,2001) M062700100005 AUTHOR (K.R.GARROW,F.ADIMI,N.R.KOLB,J.LU,R.E.PIWELL, M062700100006 D.M.SCOPIK, J.M.VOGT,J.W.JURY,A.KUZIN,M.N.THOMPSON, M062700100007 J.RYCKEBUSCH) M062700100008 TITLE High Resolution Measurement of the M062700100009 16O(g,pn)14N(0,1,2,...) Reaction. M062700100010 FACILITY (ESTRG,1CANSAS) SAL pulse stretcher ring with duty M062700100011 factor of approximately 80%. M062700100012 INC-SOURCE (MPH) Tagged photon spectrometer: E(G) = 98.5 141.0 M062700100013 MeV, efficiency about 53%. M062700100014 SAMPLE 1 mm thick Al frames with 7.6 micron Kapton windows M062700100015 contained heavy water (93% D2O, 7% DO. M062700100016 METHOD (COINC,EDE,TOF) M062700100017 DETECTOR (SCIN,CSICR) 2 mm thick NE102A plastic scintillator M062700100018 used as a proton dE-detector, 7.61 cm in diameter and M062700100019 7.61 cm in length CsI(Tl) scintillator as proton M062700100020 E-detector. Neutron detector 10 BC400 plastic M062700100021 scintillator bars. M062700100022 ANG1 is angle of proton E-dE detector. M062700100023 ANG2 is angle of neutron TOF detector. M062700100024 ANALYSIS Direct measurement. M062700100025 COMMENT The exclusive 16O(G,PN)14N-0,1,2,... reaction was M062700100026 measured for the photon energy range E(G) = 98.5 - M062700100027 141.0 MeV with an excitation energy resolution of 2.8 M062700100028 MeV. Protons were detected at 76 and 82 degrees and M062700100029 coincident neutrons were detected at the opening M062700100030 angle for quasifree deuteron photodisintegration. M062700100031 Only the T = 0, 1+, 3.95 MeV state in the residual M062700100032 14N nucleus was significantly populated. This M062700100033 corresponds to a preferred l = 0 angular momentum M062700100034 transfer to the recoil as is expected for quasifree M062700100035 kinematics. The absence of significant population to M062700100036 other discrete states is evidence that absorption on M062700100037 correlated proton-neutron pairs with an angular M062700100038 momentum transfer of l >= 2 is largely suppressed for M062700100039 the low recoil momentum range of the current M062700100040 measurement. As a consequence of this fact, and the M062700100041 absence of unnatural parity states, only absorption M062700100042 on proton-neutron pairs in relative motion l = 0, 2 M062700100043 is expected for all possible shell model coupling. No M062700100044 significant population of the T = 1 state at 2.31 MeV M062700100045 is consistent with previous measurement demonstrating M062700100046 that absorption on proton-neutron pairs in an isospin M062700100047 triplet is suppressed. The results of the measurement M062700100048 to discrete states in the residual 14N nucleus are M062700100049 compared to microscopic calculations which include M062700100050 contributions above that the mean field due to the M062700100051 short range and tensor parts of the nuclear potential.M062700100052 Clear separation in the contribution of (1p)**-2 and M062700100053 (1p)**-1 (1s)**-1 continuum above 20 MeV indicates M062700100054 that absorption on l = 1 nucleon pairs is also M062700100055 important near quasifree kinematics. M062700100056 STATUS (TABLE) DATA FROM THE TABLE 2 HAVE BEEN COMPILED AT M062700100057 THE RUSSIA MSU INP CDFE BY V.VARLAMOV. M062700100058 HISTORY (20020404C) M062700100059 (20040811A) Energy added to subentry 1 COMMON. Angle M062700100060 headings corrected. ERR-ANALYS moved to subentry 2. M062700100061 ENDBIB 59 0 M062700100062 COMMON 3 3 M062700100063 EN-MIN EN-MAX EN-RSL-FW M062700100064 MEV MEV MEV M062700100065 98.5 141. 2.8 M062700100066 ENDCOMMON 3 0 M062700100067 ENDSUBENT 66 0 M062700199999 SUBENT M0627002 20040811 M037M062700200001 BIB 3 5 M062700200002 REACTION (8-O-16(G,N+P)7-N-14,PAR,DA/DA,N/P) M062700200003 EN-SEC (E-EXC,7-N-14) M062700200004 ERR-ANALYS (DATA-ERR) Includes statistical errors, error in peak M062700200005 fitting procedures and in random background M062700200006 subtraction. M062700200007 ENDBIB 5 0 M062700200008 COMMON 1 3 M062700200009 E-EXC M062700200010 MEV M062700200011 3.95 M062700200012 ENDCOMMON 3 0 M062700200013 DATA 4 2 M062700200014 ANG2 ANG1 DATA DATA-ERR M062700200015 ADEG ADEG MB/SR2 MB/SR2 M062700200016 76. 83. 6.89 .64 M062700200017 82. 77. 8.82 .74 M062700200018 ENDDATA 4 0 M062700200019 ENDSUBENT 18 0 M062700299999 SUBENT M0627003 20040811 M037M062700300001 BIB 3 3 M062700300002 REACTION (8-O-16(G,N+P)7-N-14,PAR,DA/DA,N/P,REL) M062700300003 ERR-ANALYS No information. M062700300004 HISTORY (20040811A) REACTION, energy headings corrected. M062700300005 ENDBIB 3 0 M062700300006 COMMON 2 3 M062700300007 ANG2 ANG1 M062700300008 ADEG ADEG M062700300009 76. 83. M062700300010 ENDCOMMON 3 0 M062700300011 DATA 3 3 M062700300012 E-EXC-MIN E-EXC-MAX DATA M062700300013 MEV MEV ARB-UNITS M062700300014 0. 20. 563. M062700300015 20. 45. 2143. M062700300016 45. 70. 1648. M062700300017 ENDDATA 5 0 M062700300018 ENDSUBENT 17 0 M062700399999 SUBENT M0627004 20040811 M037M062700400001 BIB 3 3 M062700400002 REACTION (8-O-16(G,N+P)7-N-14,PAR,DA/DA,N/P,REL) M062700400003 ERR-ANALYS No information. M062700400004 HISTORY (20040811A) REACTION, energy headings corrected. M062700400005 ENDBIB 3 0 M062700400006 COMMON 2 3 M062700400007 ANG2 ANG1 M062700400008 ADEG ADEG M062700400009 82. 77. M062700400010 ENDCOMMON 3 0 M062700400011 DATA 3 3 M062700400012 E-EXC-MIN E-EXC-MAX DATA M062700400013 MEV MEV ARB-UNITS M062700400014 0. 20. 682. M062700400015 20. 45. 2329. M062700400016 45. 70. 1601. M062700400017 ENDDATA 5 0 M062700400018 ENDSUBENT 17 0 M062700499999 ENDENTRY 4 0 M062799999999