ENTRY L0282 20221107 L028200000001 SUBENT L0282001 20221107 20240513 L028200100001 BIB 12 21 L028200100002 TITLE Photo Neutron Thresholds for Pb206, Pb207, Pb208 L028200100003 AUTHOR (H.Palevsky,A.O.Hanson) L028200100004 REFERENCE (J,PR,79,242(X11),1950) L028200100005 INSTITUTE (1USAUI) L028200100006 FACILITY (BETAT,1USAORL) The 22 MeV betatron. L028200100007 DETECTOR (BF3) Gated BF3 proportional counters. L028200100008 SAMPLE Separated lead isotopes. L028200100009 METHOD The experimental apparatus utilized the electron beam, L028200100010 focused on copper sample holders at about eleven feet L028200100011 from the betatron. This reduced the background L028200100012 neutrons from the betatron to a negligible amount. L028200100013 Gated BF3 proportional counters were used to detect L028200100014 the neutrons after each electron burst. Two samples L028200100015 were rotated synchronously in front of the beam, so L028200100016 that each was irradiated on alternate bursts. L028200100017 ANALYSIS The yield versus energy data could, in each case, be L028200100018 represented as a parabola with the vertex at the L028200100019 respective threshold. L028200100020 ERR-ANALYS (DATA-ERR) No details on sources of uncertainties. L028200100021 STATUS (TABLE,,H.Palevsky+,J,PR,79,(X11),242,1950) page 242 L028200100022 HISTORY (20221107C) L028200100023 ENDBIB 21 0 L028200100024 NOCOMMON 0 0 L028200100025 ENDSUBENT 24 0 L028200199999 SUBENT L0282002 20221107 20240513 L028200200001 BIB 1 2 L028200200002 REACTION ((82-PB-207(G,X)0-NN-1,,SIG,,BRA)/ L028200200003 (82-PB-206(G,X)0-NN-1,,SIG,,BRA)) L028200200004 ENDBIB 2 0 L028200200005 NOCOMMON 0 0 L028200200006 DATA 3 1 L028200200007 EN-MAX DATA DATA-ERR L028200200008 MEV NO-DIM NO-DIM L028200200009 22. 0.80 0.02 L028200200010 ENDDATA 3 0 L028200200011 ENDSUBENT 10 0 L028200299999 SUBENT L0282003 20221107 20240513 L028200300001 BIB 1 2 L028200300002 REACTION ((82-PB-208(G,X)0-NN-1,,SIG,,BRA)/ L028200300003 (82-PB-206(G,X)0-NN-1,,SIG,,BRA)) L028200300004 ENDBIB 2 0 L028200300005 NOCOMMON 0 0 L028200300006 DATA 3 1 L028200300007 EN-MAX DATA DATA-ERR L028200300008 MEV NO-DIM NO-DIM L028200300009 22. 0.99 0.02 L028200300010 ENDDATA 3 0 L028200300011 ENDSUBENT 10 0 L028200399999 ENDENTRY 3 0 L028299999999