ENTRY M0437 20160906 M084M043700000001 SUBENT M0437001 20160906 M084M043700100001 BIB 15 48 M043700100002 TITLE Alpha particles from photodisintegration of Be-9 in M043700100003 the photon energy region 18 - 26 MeV. M043700100004 AUTHOR (A.Buchnea,R.G.Johnson,K.G.Mcneill) M043700100005 REFERENCE (J,CJP,56,47,1978) M043700100006 INSTITUTE (1CANTOR) M043700100007 FACILITY (LINAC,1USALAS) M043700100008 INC-SOURCE (BRST) M043700100009 METHOD (EXTB) M043700100010 SAMPLE The 0.0127 mm thick beryllium foil. M043700100011 PART-DET (A) M043700100012 DETECTOR (SOLST) Liquid nitrogen cooled Si(Li) detectors. M043700100013 ANALYSIS (INTAD,UNFLD,DIFFR) Measurements of alpha particle M043700100014 energy spectra were fulfilled at the angles of 45 - M043700100015 160 degrees to the direction of bremsstrahlung beam. M043700100016 The alpha particle yields at each of used M043700100017 bremsstrahlung end-point energy were normalized. By M043700100018 substracting the alpha particle yields at successive M043700100019 end-point energies from each other and dividing by M043700100020 corresponding photon spectrum difference, average M043700100021 cross sections over 2 MeV energy intervals were M043700100022 obtained by the photon difference technique. The M043700100023 energies of the median points of the alpha particle M043700100024 distributions of a pure reaction Be-9(g,n)Be-8(E-exc M043700100025 = 16.6 MeV) at each angle of detection for each M043700100026 bremsstrahlung end-point energy were determined by M043700100027 kinematic calculations. M043700100028 CORRECTION The detected alpha particles were corrected for M043700100029 energy losses in the beryllium target and in the M043700100030 inert silicon 'windows' of the Si(Li) detectors. The M043700100031 alpha particle energy spectra were then normalized M043700100032 for geometric efficiency of the detection system and M043700100033 for photon flux. M043700100034 COMMENT Alpha particles from the Be-9(g,n)Be-8 -> 2a and M043700100035 Be-9(g,a-0)He-5 were studied in the photon energy M043700100036 region 18 - 26 MeV; the results yielded a combined M043700100037 integrated cross section of 13.1 (2.0) MeV*mb and an M043700100038 upper limit on the integrated (g,a-0) cross section M043700100039 of 4.0 MeV*mb. these reactions together with the M043700100040 Be-9(g,n-1)Be-8 reaction (which has an integrated M043700100041 cross section of 2.4 (0.4) MeV*mb) are the major M043700100042 reaction channels contributing to the total M043700100043 photoneutron cross section in this energy region. M043700100044 the (g,n-1) reaction are consistent with the M043700100045 population of 3/2+ and 5/2+ states of Be-9. M043700100046 STATUS (TABLE) Data from Tab. 2. M043700100047 HISTORY (19910218C) M043700100048 (20160906A) Corrected by V.Varlamov: ANALYSIS, M043700100049 ERR-ANALYS, REACTION, dates, lowercase. M043700100050 ENDBIB 48 0 M043700100051 NOCOMMON 0 0 M043700100052 ENDSUBENT 51 0 M043700199999 SUBENT M0437002 20160906 M084M043700200001 BIB 5 7 M043700200002 REACTION (4-BE-9(G,X)2-HE-4,PAR,SIG,,BRA) M043700200003 EN-SEC (E-LVL,2-HE-5) M043700200004 ANALYSIS Average cross sections for energy intervals M043700200005 mentioned. M043700200006 ERR-ANALYS No information. M043700200007 HISTORY (20160906A) Corrected by V.Varlamov: ANALYSIS, M043700200008 REACTIOB, ERR-ANALYS. M043700200009 ENDBIB 7 0 M043700200010 COMMON 1 3 M043700200011 E-LVL M043700200012 MEV M043700200013 0.0 M043700200014 ENDCOMMON 3 0 M043700200015 DATA 3 4 M043700200016 EN-MIN EN-MAX DATA M043700200017 MEV MEV MB M043700200018 18. 20.00 .15 M043700200019 20. 22.0 1.9 M043700200020 22. 24.0 2.8 M043700200021 24. 26.0 1.7 M043700200022 ENDDATA 6 0 M043700200023 ENDSUBENT 22 0 M043700299999 SUBENT M0437003 20160906 M084M043700300001 BIB 4 7 M043700300002 REACTION (4-BE-9(G,X)2-HE-4,PAR,INT) M043700300003 Cumulative integrated cross sections for both M043700300004 reactions (Be-8(E-exc = 16.6 MeV) -> 2a) and for M043700300005 energy intervals mentioned. M043700300006 EN-SEC (E-LVL,2-HE-4) M043700300007 ERR-ANALYS (DATA-ERR) Mean-root-squared uncertainties. M043700300008 HISTORY (20160906A) Corrected by V.Varlamov: ERR-ANALYS. M043700300009 ENDBIB 7 0 M043700300010 COMMON 1 3 M043700300011 E-LVL M043700300012 MEV M043700300013 0.0 M043700300014 ENDCOMMON 3 0 M043700300015 DATA 4 4 M043700300016 EN-MIN EN-MAX DATA DATA-ERR M043700300017 MEV MEV MB*MEV MB*MEV M043700300018 18. 20. .3 M043700300019 18. 22. 4.1 M043700300020 18. 24. 9.7 M043700300021 18. 26. 13.1 2. M043700300022 ENDDATA 6 0 M043700300023 ENDSUBENT 22 0 M043700399999 ENDENTRY 3 0 M043799999999