ENTRY L0282 20221107 L051L0282000 1 SUBENT L0282001 20221107 L051L0282001 1 BIB 12 21 L0282001 2 TITLE Photo Neutron Thresholds for Pb206, Pb207, Pb208 L0282001 3 AUTHOR (H.Palevsky,A.O.Hanson) L0282001 4 REFERENCE (J,PR,79,242(X11),1950) L0282001 5 INSTITUTE (1USAUI) L0282001 6 FACILITY (BETAT,1USAORL) The 22 MeV betatron. L0282001 7 DETECTOR (BF3) Gated BF3 proportional counters. L0282001 8 SAMPLE Separated lead isotopes. L0282001 9 METHOD The experimental apparatus utilized the electron beam, L0282001 10 focused on copper sample holders at about eleven feet L0282001 11 from the betatron. This reduced the background L0282001 12 neutrons from the betatron to a negligible amount. L0282001 13 Gated BF3 proportional counters were used to detect L0282001 14 the neutrons after each electron burst. Two samples L0282001 15 were rotated synchronously in front of the beam, so L0282001 16 that each was irradiated on alternate bursts. L0282001 17 ANALYSIS The yield versus energy data could, in each case, be L0282001 18 represented as a parabola with the vertex at the L0282001 19 respective threshold. L0282001 20 ERR-ANALYS (DATA-ERR) No details on sources of uncertainties. L0282001 21 STATUS (TABLE,,H.Palevsky+,J,PR,79,(X11),242,1950) page 242 L0282001 22 HISTORY (20221107C) L0282001 23 ENDBIB 21 0 L0282001 24 NOCOMMON 0 0 L0282001 25 ENDSUBENT 24 0 L028200199999 SUBENT L0282002 20221107 L051L0282002 1 BIB 1 2 L0282002 2 REACTION ((82-PB-207(G,X)0-NN-1,,SIG,,BRA)/ L0282002 3 (82-PB-206(G,X)0-NN-1,,SIG,,BRA)) L0282002 4 ENDBIB 2 0 L0282002 5 NOCOMMON 0 0 L0282002 6 DATA 3 1 L0282002 7 EN-MAX DATA DATA-ERR L0282002 8 MEV NO-DIM NO-DIM L0282002 9 22. 0.80 0.02 L0282002 10 ENDDATA 3 0 L0282002 11 ENDSUBENT 10 0 L028200299999 SUBENT L0282003 20221107 L051L0282003 1 BIB 1 2 L0282003 2 REACTION ((82-PB-208(G,X)0-NN-1,,SIG,,BRA)/ L0282003 3 (82-PB-206(G,X)0-NN-1,,SIG,,BRA)) L0282003 4 ENDBIB 2 0 L0282003 5 NOCOMMON 0 0 L0282003 6 DATA 3 1 L0282003 7 EN-MAX DATA DATA-ERR L0282003 8 MEV NO-DIM NO-DIM L0282003 9 22. 0.99 0.02 L0282003 10 ENDDATA 3 0 L0282003 11 ENDSUBENT 10 0 L028200399999 ENDENTRY 3 0 L028299999999