ENTRY 13829 20020409 00001382900000001 SUBENT 13829001 20020409 00001382900100001 BIB 17 74 1382900100002 INSTITUTE (1USAANL) 1382900100003 REFERENCE (J,PR/C,2,1513,197010) 1382900100004 AUTHOR (D.J.Buss,R.K.Smither) 1382900100005 TITLE Level Structure of 148Sm and 150Sm from Average 1382900100006 Resonance Neutron Capture. 1382900100007 FACILITY (REAC,1USAANL) In-pile (n,gamma) facility at Argonne 1382900100008 CP-5 research reactor. 1382900100009 INC-SOURCE (REAC) Reactor core with a thermal-neutron flux ~3e+13 1382900100010 n/(cm2.s) and an epithermal flux per unit energy 1382900100011 interval ~c/E, where c=1.8e+12 n/(cm2.s). Integrated 1382900100012 epithermal flux between 100 eV (cut-off) and 10 keV 1382900100013 ~8e+12 n/(cm2.s). 1382900100014 INC-SPECT Reactor spectrum effectively limited by boron that 1382900100015 removes low-energy neutrons. The dominant 1382900100016 contributions to the spectrum were from neutrons in 1382900100017 the approximate energy range 0.1-10 keV. 1382900100018 SAMPLE Metal capturing target of 28 g natural samarium 1382900100019 (14.97% 147Sm, 13.83% 149Sm) in the form of a disk 1382900100020 5/8 in. in diameter and 3/4 in. long, placed in a 1382900100021 graphite holder and completely surrounded by 1382900100022 1/8-in.-thick absorber of 10B powder. 1382900100023 METHOD (COINC) Pulse-height-spectra taken both in singles 1382900100024 [with Ge(Li) detector only in use] and in triple 1382900100025 coincidence [when the double-escape peak in the Ge(Li)1382900100026 detector coincides with the two annihilation gamma 1382900100027 rays on the opposite sides of the NaI(Tl) detector]. 1382900100028 The coincidence mode allowed only double escape events1382900100029 to be recorded. 1382900100030 Measured average intensity of primary gamma transitions1382900100031 to low-lying levels where neutron capture takes place 1382900100032 in a large number of resonances. Averaging process 1382900100033 removes the large fluctuations in gamma widths 1382900100034 normally observed with neutron capture in a single 1382900100035 resonance. 1382900100036 DETECTOR (GELI,NAICR) Ge(Li)-NaI(Tl) spectrometer located about 1382900100037 5 m from the target. The Ge(Li) detector, with an 1382900100038 active volume of 6 cm3 and a resolution of 5.4 keV at 1382900100039 6 MeV, was surrounded by a split-ring NaI(Tl) 1382900100040 detector. 1382900100041 MONITOR Energy calibration based on the well-measured 1382900100042 4945.46-keV line in 13C and on a number of strong 1382900100043 lines from 15N between 5.2 and 7.3 MeV. 1382900100044 The relative efficiency for double-escape peaks in the 1382900100045 Ge(Li)-NaI(Tl) coincidence spectrometer was determined1382900100046 from the observed spectrum of 13C and 15N lines 1382900100047 introduced in a calibration run. 1382900100048 ANALYSIS Gamma-ray lines were identified by their relative 1382900100049 energies used in conjunction with previously published1382900100050 level schemes, and by comparison of the average- 1382900100051 resonance capture spectrum with thermal-capture 1382900100052 spectra. 1382900100053 Two different line shapes used in the analysis, one for1382900100054 El peaks and a second with a longer high-energy tail 1382900100055 for M1 and E2 peaks. 1382900100056 CORRECTION Data corrected for spectrometer efficiency and 1382900100057 gamma-ray absorption. 1382900100058 ERR-ANALYS (E-ERR) Uncertainties in gamma-ray energies; do not 1382900100059 include the absolute error in the Q value. 1382900100060 (DATA-ERR) Intensity uncertainties; include both 1382900100061 statistical error and the probable systematic errors 1382900100062 in the corrections for spectrometer efficiency and 1382900100063 gamma-ray absorption. 1382900100064 Systematic uncertainties of line intensities due to 1382900100065 residual fluctuations in the average intensities 1382900100066 related to the Porter-Thomas distributions of 1382900100067 radiation widths are 10%. 1382900100068 ADD-RES Unique spin and parity assignments given for almost all1382900100069 the states below 2.2 MeV in both isotopes. The neutron1382900100070 binding energies of 148Sm and 150Sm found to be 1382900100071 8140.6(18) and 7986.4(18) keV, respectively, after 1382900100072 correction for the energy spectrum of the captured 1382900100073 neutrons. 1382900100074 STATUS Data taken from Table II, III, and IV in reference. 1382900100075 HISTORY (20020328C) IS 1382900100076 ENDBIB 74 0 1382900100077 COMMON 2 3 1382900100078 EN-MIN EN-MAX 1382900100079 EV EV 1382900100080 100. 10000. 1382900100081 ENDCOMMON 3 0 1382900100082 ENDSUBENT 81 0 1382900199999 SUBENT 13829002 20020409 00001382900200001 BIB 1 1 1382900200002 REACTION (62-SM-149(N,G)62-SM-150,,SPC,,REL/SPA) 1382900200003 ENDBIB 1 0 1382900200004 NOCOMMON 0 0 1382900200005 DATA 5 46 1382900200006 E E-ERR DATA DATA-ERR DATA-MAX 1382900200007 KEV KEV ARB-UNITS PER-CENT ARB-UNITS 1382900200008 7653.1 0.3 806. 5. 1382900200009 7247.0 10. 1382900200010 7214.1 0.3 1000. 5. 1382900200011 6941.5 0.3 385. 8. 1382900200012 6916.4 0.6 112. 12. 1382900200013 6822.7 1.8 19. 50. 1382900200014 6793.8 0.4 430. 8. 1382900200015 6730.8 15. 1382900200016 6708.6 27. 1382900200017 6630.5 0.9 68. 16. 1382900200018 6570.6 0.4 354. 7. 1382900200019 6538.7 0.3 642. 5. 1382900200020 6483.0 0.4 721. 7. 1382900200021 6345.3 1.4 613. 5. 1382900200022 6315.5 18. 1382900200023 6303.7 0.9 79. 20. 1382900200024 6227.9 0.9 52. 30. 1382900200025 6214.9 0.9 36. 30. 1382900200026 6193.7 0.9 187. 15. 1382900200027 6168.5 0.3 701. 6. 1382900200028 6154.1 0.6 204. 10. 1382900200029 6039.8 1.8 33. 40. 1382900200030 6017.5 0.4 477. 6. 1382900200031 6008.9 0.9 53. 60. 1382900200032 5983.6 0.4 155. 12. 1382900200033 5968.2 0.9 203. 20. 1382900200034 5963.6 0.6 396. 12. 1382900200035 5944.4 0.4 369. 8. 1382900200036 5932.9 0.9 162. 20. 1382900200037 5925.7 0.9 396. 15. 1382900200038 5892.6 0.5 203. 12. 1382900200039 5879.3 1.8 34. 60. 1382900200040 5836.0 372. 20. 1382900200041 5794.3 0.5 412. 15. 1382900200042 5764.5 30. 107. 1382900200043 5754.7 60. 30. 1382900200044 5739.9 415. 30. 1382900200045 5727.0 0.4 421. 10. 1382900200046 5708.1 0.9 55. 40. 1382900200047 5697.1 0.9 367. 15. 1382900200048 5660.1 1.8 41. 30. 1382900200049 5628.2 0.5 376. 10. 1382900200050 5618.8 1.0 400. 20. 1382900200051 5534.7 0.5 321. 10. 1382900200052 5515.7 1.1 226. 20. 1382900200053 5493.0 1.2 363. 15. 1382900200054 ENDDATA 48 0 1382900200055 ENDSUBENT 54 0 1382900299999 SUBENT 13829003 20020409 00001382900300001 BIB 1 1 1382900300002 REACTION (62-SM-147(N,G)62-SM-148,,SPC,,REL/SPA) 1382900300003 ENDBIB 1 0 1382900300004 NOCOMMON 0 0 1382900300005 DATA 5 33 1382900300006 E E-ERR DATA DATA-ERR DATA-MAX 1382900300007 KEV KEV ARB-UNITS PER-CENT ARB-UNITS 1382900300008 7591.1 0.3 841. 5. 1382900300009 6980.2 0.5 108. 15. 1382900300010 6961.5 0.3 1072. 5. 1382900300011 6708.9 1.4 25. 40. 1382900300012 6688.0 0.3 393. 6. 1382900300013 6677.3 7. 1382900300014 6547.4 1.8 65. 20. 1382900300015 6478.2 0.6 385. 10. 1382900300016 6408.7 0.3 737. 5. 1382900300017 6247.5 0.3 630. 5. 1382900300018 6238.7 0.3 652. 5. 1382900300019 6111.0 1.0 119. 1382900300020 6061.3 0.4 177. 15. 1382900300021 6046.3 25. 1382900300022 6030.9 0.4 616. 5. 1382900300023 5995.2 0.4 512. 6. 1382900300024 5983.6 0.4 155. 12. 1382900300025 5968.2 0.9 89. 20. 1382900300026 5947.8 50. 1382900300027 5932.9 0.9 162. 20. 1382900300028 5928.9 1.4 170. 20. 1382900300029 5914.0 0.4 436. 8. 1382900300030 5827.4 0.9 224. 12. 1382900300031 5813.6 200. 1382900300032 5803.8 1.4 53. 30. 1382900300033 5752.4 0.9 367. 15. 1382900300034 5701.7 1.8 75. 40. 1382900300035 5652.1 0.7 369. 10. 1382900300036 5628.2 0.5 376. 10. 1382900300037 5616.4 0.9 400. 7. 1382900300038 5603.2 0.9 169. 12. 1382900300039 5572.1 1.8 40. 50. 1382900300040 5502.2 1.8 162. 25. 1382900300041 ENDDATA 35 0 1382900300042 ENDSUBENT 41 0 1382900399999 SUBENT 13829004 20020409 00001382900400001 BIB 1 3 1382900400002 REACTION (62-SM-0(N,G),,SPC,,REL/SPA) 1382900400003 Uncertain isotopic assignment of gamma lines (150Sm 1382900400004 or/and 148Sm). 1382900400005 ENDBIB 3 0 1382900400006 NOCOMMON 0 0 1382900400007 DATA 4 12 1382900400008 E E-ERR DATA DATA-ERR 1382900400009 KEV KEV ARB-UNITS PER-CENT 1382900400010 6743.3 0.9 91. 20. 1382900400011 6672.0 1.8 11. 70. 1382900400012 6554.9 1.4 69. 20. 1382900400013 6466.0 1.8 28. 40. 1382900400014 6435.4 1.4 28. 30. 1382900400015 6425.4 1.8 26. 40. 1382900400016 6111.0 0.5 119. 12. 1382900400017 5646.1 1.2 88. 30. 1382900400018 5574.7 1.2 128. 15. 1382900400019 5557.0 1.4 95. 20. 1382900400020 5509.2 0.6 421. 10. 1382900400021 5497.3 1.4 308. 15. 1382900400022 ENDDATA 14 0 1382900400023 ENDSUBENT 22 0 1382900499999 ENDENTRY 4 0 1382999999999