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