G3139001 20250527 G3139001 20250527 12 31 Measurement of yield ratios for the isomeric pair 137m,gCe in the 141Pr(g,x)137m,gCe reactions with bremsstrahlung end-point energies of 50-, 60-, and 70-MeV (V.D.Nguyen, T.L.Nguyen, T.X.Nguyen, D.K.Pham, T.H.Nguyen, G.N.Kim, K.Kim, S.G.Shin, Y.U.Kye, M.H.Cho) (3VN IPH,3VN NNR,3KORKNU,3KORPUE) (3VN VN) Duy Tan University, Hanoi (J,RPC,176,109016,2020) (LINAC,3KORPUE) Pohang Accelerator Laboratory (PAL) (BRST) Pulsed electron beam on thin tungsten target (Size 100 mm x 100 mm, thickness 0.1 mm) Praseodymium foil (Pr) - Purity: 99.9% - Thickness: 0.1 mm - Size: 15 mm x 15 mm (ACTIV,GSPEC) Irradiated for 1 hour (HPGE) Energy resolution of 1.8 keV for 1332.5 keV peak of 60Co and detection efficiency of 20% relative to a 3 inch x 3 inch in NaI(Tl) detector at 1332.5 keV (ERR-T) Total uncertainty: 11-15% (ERR-S,3.,4.) Statistical error (3-4%) (ERR-1,3.,5.) Gamma-ray intensity (3-5%) (ERR-2,4.,6.) Gamma-ray interference (4-6%) (ERR-3,3.,4.) Photo peak area fitting (3-4%) (ERR-4,6.,7.) Photon flux (6-7%) (ERR-5,5.,6.) Others (5-6%) (TABLE,,V.D.Nguyen+,J,RPC,176,109016,2020) Table 2 (APRVD) Approved by G.N.Kim (2025-05-xx) (20250527C) S.C.Yang ENDBIB 31 0 NOCOMMON ENDSUBENT 34 0 G3139002 20250527 3 9 (59-Pr-141(G,X)58-CE-137-M/G,,SIG/RAT,,BRA) (58-CE-137-M,34.4HR,DG,254.29,0.111) 11/2- (58-CE-137-G,9.0HR,DG,447.15,0.0168) 3/2+ 1Activity of the 137mCe was determined by subtraction of the activity contribution of 255.11 keV gamma from 139Pr Activity contribution by using the peak to peak ratio relationship. 2Activity was considered based on the different half-lived relationship between the 139Pr and 137mCe. ENDBIB 9 0 NOCOMMON EN-MAX DATA 1 ERR-T 1 DATA 2 ERR-T 2 MEV NO-DIM NO-DIM NO-DIM NO-DIM 50. 0.95 0.14 0.96 0.15 60. 1.42 0.18 1.39 0.17 70. 1.78 0.22 1.79 0.20 ENDDATA ENDSUBENT 19 0 ENDENTRY