ENTRY M0672 20050614 M037M067200000001
SUBENT M0672001 20050614 M037M067200100001
BIB 16 45 M067200100002
TITLE Fission cross section and fissility of 209Bi by 60 - M067200100003
270 MeV tagged photons. M067200100004
AUTHOR (M.L.TERRANOVA,G.YA.KEZERASHVILI,V.A.KISELEV, M067200100005
A.M.MILOV,S.I.MISHNEV,I.YA.PROTOPOPOV,V.N.ROTAEV, M067200100006
D.N.SHATILOV,O.A.P.TAVARES) M067200100007
INSTITUTE (4RUSSIB,2ITYFRA,3BZLRIO) M067200100008
REFERENCE (J,JP/G,22,1661,1996) M067200100009
INC-SOURCE (MPH,COMPT,LASER) Tagged photons produced by the M067200100010
compton and backscattering gamma quanta at M067200100011
backscattering laser photon facility ROKK-2 at the M067200100012
VEPP-3 storage ring. M067200100013
FACILITY (ESTRG,4RUSSIB) ROKK-2 facility of Budker Institute M067200100014
of Nuclear Physics, Novosibirsk. M067200100015
SAMPLE The bismuth targets consisted of high-purity metal M067200100016
films prepared by vacuum evaporatuion on alumonoum M067200100017
plates 300 micron thick. The targets (4 cm in M067200100018
diameter) were licated insude the FF vessel at a M067200100019
distance of 3 mm from the multiwire spark counter M067200100020
anodes. M067200100021
DETECTOR (MWSC) Nuclear fission fragment detector (FF) based on M067200100022
multiwire spark counters (SC). M067200100023
METHOD (EXTB,SITA) M067200100024
ANALYSIS The direct fission fragment track counting. M067200100025
MONITOR (92-U-238(G,F),,SIG) M067200100026
REL-REF (R,,A.S.ILJINOV+,J,NP/A,539,263,1992) 238U monitor M067200100027
absolute fission cross section. M067200100028
ERR-ANALYS (DATA-ERR) Statistical errors. M067200100029
STATUS (CURVE) Data from Fig. 2 were compiled at the Russia M067200100030
MSU SINP CDFE by V.V.VARLAMOV. M067200100031
COMMENT Tagged photons produced by the ROKK-2 facility have M067200100032
been used to measure the photofission cross section M067200100033
of 209Bi in the energy range 60 - 270 MeV. Fission M067200100034
events were detected by using a nuclear fragment M067200100035
detector based on multiwire spark counters. M067200100036
Fissility values have been deduced and compared with M067200100037
available data obtained with monochromatic photons M067200100038
in othder laboratories. These data have been M067200100039
analysed in the framework of a two-step model wich M067200100040
considers the primary photointegration occuring via M067200100041
the quasi-deuteron and/or photomesonic processes, M067200100042
followed by mechanism of evaporation-fission M067200100043
competition for the excited residual nucleus. The M067200100044
model was found to reproduce the main experimental M067200100045
features of 209Bi photofissility up to 300 MeV. M067200100046
HISTORY (20050606C) M067200100047
ENDBIB 45 0 M067200100048
NOCOMMON 0 0 M067200100049
ENDSUBENT 48 0 M067200199999
SUBENT M0672002 20050614 M037M067200200001
BIB 1 1 M067200200002
REACTION (83-BI-209(G,F),,SIG) M067200200003
ENDBIB 1 0 M067200200004
NOCOMMON 0 0 M067200200005
DATA 3 10 M067200200006
EN DATA DATA-ERR M067200200007
MEV MB MB M067200200008
60. .015 .075 M067200200009
89.3 .306 .078 M067200200010
124.1 .448 .079 M067200200011
148.3 1.015 .082 M067200200012
173.6 1.731 .269 M067200200013
178.7 2.015 .284 M067200200014
208.9 2.388 .388 M067200200015
223.7 3.313 .672 M067200200016
239.1 4.575 .587 M067200200017
270. 6.594 .321 M067200200018
ENDDATA 12 0 M067200200019
ENDSUBENT 18 0 M067200299999
ENDENTRY 2 0 M067299999999