ENTRY M0436 20160906 M084M0436 0 1 SUBENT M0436001 20160906 M084M0436 1 1 BIB 16 49 M0436 1 2 TITLE Angular distributions and cross sections of the M0436 1 3 photoneutron reaction in Be-9 in the photon energy M0436 1 4 region 18 - 26 MeV. M0436 1 5 AUTHOR (A.Buchnea,R.G.Johnson,K.G.Mcneill) M0436 1 6 REFERENCE (J,CJP,55,364,1977) M0436 1 7 INSTITUTE (1CANTOR) M0436 1 8 FACILITY (LINAC,1CANTOR) M0436 1 9 INC-SOURCE (QMPH,THRDT) Threshold technique determined energy of M0436 1 10 incident bremsstrahlung photon. M0436 1 11 METHOD (TOF) M0436 1 12 SAMPLE The targets used were 0.3 cm thick beryllium metal, M0436 1 13 and (D-2)O, (H-2)O, and dummy targets of the same M0436 1 14 thickness. M0436 1 15 PART-DET (N) M0436 1 16 ANALYSIS (INTED) Measurements of neutron spectra were made at M0436 1 17 five angles between 50 and 146 degrees. Because of M0436 1 18 the 2.9 MeV separation between the ground state and M0436 1 19 first excited state of Be-8, kinematics enables a M0436 1 20 reasonably unambiguous identification to be made of M0436 1 21 neutrons in the highest 2 MeV of each neutron M0436 1 22 spectrum at each end-point energy. Correspondingly, M0436 1 23 the 8.5 MeV separation between the first excited M0436 1 24 state and second excited state of Be-8 makes M0436 1 25 possible the fairly unambiguous identification of M0436 1 26 first excited state in the highest 6 MeV of each M0436 1 27 neutron spectrum once the ground state neutron M0436 1 28 contribution has been substracted. By comparison M0436 1 29 with the photoneutron spectra from the deuterium M0436 1 30 photodisintegration and use of Partovi's cross M0436 1 31 section for deuterium, differential cross sections M0436 1 32 for beryllium were obtained. M0436 1 33 MONITOR (1-H-2(G,N)1-H-1,,DA) M0436 1 34 MONIT-REF (,F.Partovi,J,AP,27,79,1964) M0436 1 35 ERR-ANALYS (ERR-S) The errors are statistical. M0436 1 36 COMMENT The Be-9(g,n-0)Be-8 and Be-9(g,n-1)Be-8 reactions M0436 1 37 were studied in the photon energy region 18 - 26 M0436 1 38 MeV. The integrated cross section of (g,n-0) M0436 1 39 reaction was found to be less than 0.1 MeV*mb in M0436 1 40 this energy region. The integrated cross section for M0436 1 41 the (g,n-1) reaction in the energy region studied is M0436 1 42 2.4(0.4) MeV*mb, which is 10 to 15% of the total M0436 1 43 photoneutron cross section. The measured angular M0436 1 44 distributions for the (g,n-1) reaction are M0436 1 45 consistent with the population of 3/2+ and 5/2+ M0436 1 46 states of Be-9. M0436 1 47 STATUS (CURVE) M0436 1 48 HISTORY (19910218C) M0436 1 49 (20160906A) Corrected by V.Varlamov: ERR-ANALYS, M0436 1 50 STATUS, dates, lowercase. M0436 1 51 ENDBIB 49 0 M0436 1 52 NOCOMMON 0 0 M0436 1 53 ENDSUBENT 52 0 M0436 199999 SUBENT M0436002 20160906 M084M0436 2 1 BIB 4 4 M0436 2 2 REACTION (4-BE-9(G,N)4-BE-8,PAR,DA,,4PI) M0436 2 3 EN-SEC (E-LVL,4-BE-8) M0436 2 4 MISC-COL (MISC) End point energy of bremsstrahlung spectrum. M0436 2 5 HISTORY (20160906A) Corrected by V.Varlamov: ERR-S. M0436 2 6 ENDBIB 4 0 M0436 2 7 COMMON 3 3 M0436 2 8 ANG-MIN ANG-MAX E-LVL M0436 2 9 ADEG ADEG MEV M0436 2 10 50. 146. 2.9 M0436 2 11 ENDCOMMON 3 0 M0436 2 12 DATA 4 16 M0436 2 13 EN DATA ERR-S MISC M0436 2 14 MEV MB MB MEV M0436 2 15 17. .58 .06 22.5 M0436 2 16 18. .495 .055 22.5 M0436 2 17 19. .425 .050 22.5 M0436 2 18 19. .495 .085 24.5 M0436 2 19 20. .42 .05 22.5 M0436 2 20 20. .48 .07 24.5 M0436 2 21 21. .44 .06 24.5 M0436 2 22 21. .351 .049 26.5 M0436 2 23 22. .385 .055 24.5 M0436 2 24 22. .275 .050 26.5 M0436 2 25 23. .245 .050 26.5 M0436 2 26 23. .155 .025 28.5 M0436 2 27 24. .235 .045 26.5 M0436 2 28 24. .145 .025 28.5 M0436 2 29 25. .140 .025 28.5 M0436 2 30 26. .140 .025 28.5 M0436 2 31 ENDDATA 18 0 M0436 2 32 ENDSUBENT 31 0 M0436 299999 SUBENT M0436003 20160906 M084M0436 3 1 BIB 4 4 M0436 3 2 REACTION (4-BE-9(G,N)4-BE-8,PAR,INT) M0436 3 3 EN-SEC (E-LVL,4-BE-8) M0436 3 4 STATUS (DEP,M0456002) Reaction cross section. M0436 3 5 HISTORY (20160906A) Corrected by V.Varlamov: ERR-S. M0436 3 6 ENDBIB 4 0 M0436 3 7 COMMON 2 3 M0436 3 8 EN-MIN EN-MAX M0436 3 9 MEV MEV M0436 3 10 18. 26. M0436 3 11 ENDCOMMON 3 0 M0436 3 12 DATA 4 2 M0436 3 13 E-LVL DATA ERR-S DATA-MAX M0436 3 14 MEV MB*MEV MB*MEV MB*MEV M0436 3 15 0.0 .1 M0436 3 16 2.9 2.4 .4 M0436 3 17 ENDDATA 4 0 M0436 3 18 ENDSUBENT 17 0 M0436 399999 ENDENTRY 3 0 M043699999999