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