ENTRY 14741 20220204 14961474100000001 SUBENT 14741001 20220204 14961474100100001 BIB 8 14 1474100100002 TITLE Long Range Alpha-Particles Emitted in Connection with 1474100100003 Fission. Preliminary Report 1474100100004 AUTHOR (G.Farwell,E.Segre,C.Wiegand) 1474100100005 REFERENCE (J,PR,71,327,1947) 1474100100006 #doi:10.1103/PhysRev.71.327 1474100100007 INSTITUTE (1USALAS) 1474100100008 FACILITY (CYCLO,1USALAS) 1474100100009 DETECTOR (IOCH) 1474100100010 METHOD (COINC) The chamber was irradiated with slow neutrons 1474100100011 from the cyclotron. A coincidence circuit registered 1474100100012 events occurring simultaneously on each side of the 1474100100013 chamber. Alpha particles are emitted in coincidence 1474100100014 (within 5*10**-6 sec.) with fission in U235 and Pu239.1474100100015 HISTORY (20220204C) BP 1474100100016 ENDBIB 14 0 1474100100017 COMMON 1 3 1474100100018 EN-MAX 1474100100019 EV 1474100100020 1.0 1474100100021 ENDCOMMON 3 0 1474100100022 ENDSUBENT 21 0 1474100199999 SUBENT 14741002 20220204 14961474100200001 BIB 3 7 1474100200002 REACTION ((92-U-235(N,F)2-HE-4,,SIG)/(92-U-235(N,F),,SIG)) 1474100200003 SAMPLE The enriched sample used consisted of 0.220 mg of 1474100200004 U235 electrodeposited on a thin platinum foil 1474100200005 weighing 8 mg/cm2. This foil was also backed with an 1474100200006 additional layer of gold weighing 5 mg/cm2 making an 1474100200007 equivalent total of 12.2 mg/cm2 of gold. 1474100200008 STATUS (TABLE) page 327. 1474100200009 ENDBIB 7 0 1474100200010 NOCOMMON 0 0 1474100200011 DATA 1 1 1474100200012 DATA 1474100200013 NO-DIM 1474100200014 0.004 1474100200015 ENDDATA 3 0 1474100200016 ENDSUBENT 15 0 1474100299999 SUBENT 14741003 20220204 14961474100300001 BIB 4 9 1474100300002 REACTION (92-U-235(N,F)2-HE-4,,KE) 1474100300003 SAMPLE The enriched sample used consisted of 0.220 mg of 1474100300004 U235 electrodeposited on a thin platinum foil 1474100300005 weighing 8 mg/cm2. This foil was also backed with an 1474100300006 additional layer of gold weighing 5 mg/cm2 making an 1474100300007 equivalent total of 12.2 mg/cm2 of gold. 1474100300008 METHOD Absorber between A and B chamber plates 8 mg/cm2 Pt+5 1474100300009 mg/cm2 Au for the U235 curve. 1474100300010 STATUS (TABLE) page 329. 1474100300011 ENDBIB 9 0 1474100300012 NOCOMMON 0 0 1474100300013 DATA 1 1 1474100300014 DATA-MAX 1474100300015 MEV 1474100300016 16.0 1474100300017 ENDDATA 3 0 1474100300018 ENDSUBENT 17 0 1474100399999 SUBENT 14741004 20220204 14961474100400001 BIB 3 6 1474100400002 REACTION ((92-U-235(N,F)2-HE-4,,SIG)/(92-U-235(N,F),,SIG)) 1474100400003 SAMPLE A sample of about 2 mg of Pu239 was used for the 1474100400004 experiment. A collimating screen, necessary to reduce 1474100400005 the alpha-background on the fission side A, reduced 1474100400006 the effective mass of the Pu239 to about 0.200 mg. 1474100400007 STATUS (TABLE) page 327. 1474100400008 ENDBIB 6 0 1474100400009 NOCOMMON 0 0 1474100400010 DATA 1 1 1474100400011 DATA 1474100400012 NO-DIM 1474100400013 0.002 1474100400014 ENDDATA 3 0 1474100400015 ENDSUBENT 14 0 1474100499999 SUBENT 14741005 20220204 14961474100500001 BIB 4 8 1474100500002 REACTION (94-PU-239(N,F)2-HE-4,,KE) 1474100500003 SAMPLE A sample of about 2 mg of Pu239 was used for the 1474100500004 experiment. A collimating screen, necessary to reduce 1474100500005 the alpha-background on the fission side A, reduced 1474100500006 the effective mass of the Pu239 to about 0.200 mg. 1474100500007 METHOD Absorber between A and B chamber plates 8 mg/cm2 Pt 1474100500008 +15 mg/cm2 Au for the Pu239 curve. 1474100500009 STATUS (TABLE) page 329. 1474100500010 ENDBIB 8 0 1474100500011 NOCOMMON 0 0 1474100500012 DATA 1 1 1474100500013 DATA-MAX 1474100500014 MEV 1474100500015 16.0 1474100500016 ENDDATA 3 0 1474100500017 ENDSUBENT 16 0 1474100599999 ENDENTRY 5 0 1474199999999