ENTRY 14814 20230415 150614814000 1 SUBENT 14814001 20230415 150614814001 1 BIB 12 28 14814001 2 TITLE Evidence Against the Existence of 23-Hour V53 14814001 3 AUTHOR (R.K.Sheline,J.R.Wilkinson,B.J.Dropesky,T.T.Shull) 14814001 4 REFERENCE (J,PR,99,1055(1),1955) 14814001 5 #doi:10.1103/physrev.99.1055 14814001 6 INSTITUTE (1USAFSU,1USALAS) 14814001 7 FACILITY (REAC,1USALAS) The Los Alamos Water Boiler. 14814001 8 INC-SOURCE (REAC) The flux of neutrons greater than 5 MeV, i.e., 14814001 9 3.6*10**10 neutrons/cm2 sec. 14814001 10 DETECTOR (PROPC) 14814001 11 SAMPLE Spectroscopically pure, normal chromium, 9.5% 53Cr. 14814001 12 METHOD (ACTIV,CHSEP) "Spec. pure" normal chromium was 14814001 13 irradiated for about 13.4 hours in the fast neutron 14814001 14 flux of the Los Alamos Water Boiler. Vanadium was 14814001 15 chemically separated from the chromium and the 14814001 16 vanadium sample counted in a beta proportional 14814001 17 counter. This sample had a maximum beta activity of 14814001 18 approximately 3 cpm which might be attributed to 14814001 19 23-hour V53. No measurable gamma activity was present. 14814001 20 ANALYSIS Assuming 5 MeV to be a reasonable value for the 14814001 21 effective threshold for 53Cr(n,p) reaction and using 14814001 22 what is considered to be the approximate value of the 14814001 23 flux of neutrons greater than 5 MeV, an approximate 14814001 24 limit of the average cross section for this reaction 14814001 25 was calculated to be approximately 3.4*10**-5 mb. 14814001 26 DECAY-DATA (23-V-53,23.0HR) 14814001 27 Compiler's comment: As the title of the paper already 14814001 28 suggests, a 23 hr V-53 state is still unknown. 14814001 29 HISTORY (20230415C) BP 14814001 30 ENDBIB 28 0 14814001 31 NOCOMMON 0 0 14814001 32 ENDSUBENT 31 0 1481400199999 SUBENT 14814002 20230415 150614814002 1 BIB 2 3 14814002 2 REACTION (24-CR-53(N,P)23-V-53,,SIG,,SPA) 14814002 3 STATUS (TABLE,,R.K.Sheline+,J,PR,99,1055(1),1955) 14814002 4 page 792 of J,PR,94,792,1954. 14814002 5 ENDBIB 3 0 14814002 6 NOCOMMON 0 0 14814002 7 DATA 2 1 14814002 8 EN-MIN DATA-MAX 14814002 9 MEV MB 14814002 10 5.0 3.4E-05 14814002 11 ENDDATA 3 0 14814002 12 ENDSUBENT 11 0 1481400299999 ENDENTRY 2 0 1481499999999