ENTRY M0436 20160906 M084M043600000001 SUBENT M0436001 20160906 M084M043600100001 BIB 16 49 M043600100002 TITLE Angular distributions and cross sections of the M043600100003 photoneutron reaction in Be-9 in the photon energy M043600100004 region 18 - 26 MeV. M043600100005 AUTHOR (A.Buchnea,R.G.Johnson,K.G.Mcneill) M043600100006 REFERENCE (J,CJP,55,364,1977) M043600100007 INSTITUTE (1CANTOR) M043600100008 FACILITY (LINAC,1CANTOR) M043600100009 INC-SOURCE (QMPH,THRDT) Threshold technique determined energy of M043600100010 incident bremsstrahlung photon. M043600100011 METHOD (TOF) M043600100012 SAMPLE The targets used were 0.3 cm thick beryllium metal, M043600100013 and (D-2)O, (H-2)O, and dummy targets of the same M043600100014 thickness. M043600100015 PART-DET (N) M043600100016 ANALYSIS (INTED) Measurements of neutron spectra were made at M043600100017 five angles between 50 and 146 degrees. Because of M043600100018 the 2.9 MeV separation between the ground state and M043600100019 first excited state of Be-8, kinematics enables a M043600100020 reasonably unambiguous identification to be made of M043600100021 neutrons in the highest 2 MeV of each neutron M043600100022 spectrum at each end-point energy. Correspondingly, M043600100023 the 8.5 MeV separation between the first excited M043600100024 state and second excited state of Be-8 makes M043600100025 possible the fairly unambiguous identification of M043600100026 first excited state in the highest 6 MeV of each M043600100027 neutron spectrum once the ground state neutron M043600100028 contribution has been substracted. By comparison M043600100029 with the photoneutron spectra from the deuterium M043600100030 photodisintegration and use of Partovi's cross M043600100031 section for deuterium, differential cross sections M043600100032 for beryllium were obtained. M043600100033 MONITOR (1-H-2(G,N)1-H-1,,DA) M043600100034 MONIT-REF (,F.Partovi,J,AP,27,79,1964) M043600100035 ERR-ANALYS (ERR-S) The errors are statistical. M043600100036 COMMENT The Be-9(g,n-0)Be-8 and Be-9(g,n-1)Be-8 reactions M043600100037 were studied in the photon energy region 18 - 26 M043600100038 MeV. The integrated cross section of (g,n-0) M043600100039 reaction was found to be less than 0.1 MeV*mb in M043600100040 this energy region. The integrated cross section for M043600100041 the (g,n-1) reaction in the energy region studied is M043600100042 2.4(0.4) MeV*mb, which is 10 to 15% of the total M043600100043 photoneutron cross section. The measured angular M043600100044 distributions for the (g,n-1) reaction are M043600100045 consistent with the population of 3/2+ and 5/2+ M043600100046 states of Be-9. M043600100047 STATUS (CURVE) M043600100048 HISTORY (19910218C) M043600100049 (20160906A) Corrected by V.Varlamov: ERR-ANALYS, M043600100050 STATUS, dates, lowercase. M043600100051 ENDBIB 49 0 M043600100052 NOCOMMON 0 0 M043600100053 ENDSUBENT 52 0 M043600199999 SUBENT M0436002 20160906 M084M043600200001 BIB 4 4 M043600200002 REACTION (4-BE-9(G,N)4-BE-8,PAR,DA,,4PI) M043600200003 EN-SEC (E-LVL,4-BE-8) M043600200004 MISC-COL (MISC) End point energy of bremsstrahlung spectrum. M043600200005 HISTORY (20160906A) Corrected by V.Varlamov: ERR-S. M043600200006 ENDBIB 4 0 M043600200007 COMMON 3 3 M043600200008 ANG-MIN ANG-MAX E-LVL M043600200009 ADEG ADEG MEV M043600200010 50. 146. 2.9 M043600200011 ENDCOMMON 3 0 M043600200012 DATA 4 16 M043600200013 EN DATA ERR-S MISC M043600200014 MEV MB MB MEV M043600200015 17. .58 .06 22.5 M043600200016 18. .495 .055 22.5 M043600200017 19. .425 .050 22.5 M043600200018 19. .495 .085 24.5 M043600200019 20. .42 .05 22.5 M043600200020 20. .48 .07 24.5 M043600200021 21. .44 .06 24.5 M043600200022 21. .351 .049 26.5 M043600200023 22. .385 .055 24.5 M043600200024 22. .275 .050 26.5 M043600200025 23. .245 .050 26.5 M043600200026 23. .155 .025 28.5 M043600200027 24. .235 .045 26.5 M043600200028 24. .145 .025 28.5 M043600200029 25. .140 .025 28.5 M043600200030 26. .140 .025 28.5 M043600200031 ENDDATA 18 0 M043600200032 ENDSUBENT 31 0 M043600299999 SUBENT M0436003 20160906 M084M043600300001 BIB 4 4 M043600300002 REACTION (4-BE-9(G,N)4-BE-8,PAR,INT) M043600300003 EN-SEC (E-LVL,4-BE-8) M043600300004 STATUS (DEP,M0456002) Reaction cross section. M043600300005 HISTORY (20160906A) Corrected by V.Varlamov: ERR-S. M043600300006 ENDBIB 4 0 M043600300007 COMMON 2 3 M043600300008 EN-MIN EN-MAX M043600300009 MEV MEV M043600300010 18. 26. M043600300011 ENDCOMMON 3 0 M043600300012 DATA 4 2 M043600300013 E-LVL DATA ERR-S DATA-MAX M043600300014 MEV MB*MEV MB*MEV MB*MEV M043600300015 0.0 .1 M043600300016 2.9 2.4 .4 M043600300017 ENDDATA 4 0 M043600300018 ENDSUBENT 17 0 M043600399999 ENDENTRY 3 0 M043699999999