ENTRY 23486 20201005 22932348600000001 SUBENT 23486001 20201005 22932348600100001 BIB 7 15 2348600100002 TITLE Investigation of excited states of 11B and 7Li by means2348600100003 of thermal neutron capture on 10B nuclei 2348600100004 AUTHOR (P.J.J.Kok, J.B.M.de Haas, K.Abrahams, H.Postma, 2348600100005 W.J.Huiskamp) 2348600100006 REFERENCE (J,ZP/A,324,271,1986) 2348600100007 INSTITUTE (2NEDRCN) FOM-ECN Nuclear Structure Group, 2348600100008 Energieonderzoek Centrum Nederland, Petten, Netherlands2348600100009 P.J.J.Kok, J.B.M.deHaas, K.Abrahams 2348600100010 (2NEDDEL) H.Postma 2348600100011 (2NEDLEI) W.J.Huiskamp 2348600100012 FACILITY (REAC) No additional information in the article. 2348600100013 COMMENT Of compiler M.M. Incident neutron energy is not given 2348600100014 in the article, assumed by compiler to be thermal. 2348600100015 HISTORY (20190303C) M.M. 2348600100016 (20201005A) M.M. Subent 004 was corrected. 2348600100017 ENDBIB 15 0 2348600100018 NOCOMMON 0 0 2348600100019 ENDSUBENT 18 0 2348600199999 SUBENT 23486002 20190303 22802348600200001 BIB 13 50 2348600200002 REACTION (5-B-10(N,G)5-B-11,,SIG,,SPA) 2348600200003 Peak area 1868+-69 counts 2348600200004 REL-REF (R,,B.Krusche+,J,NP/A,386,245,1982) 2348600200005 Cl-35(n,gamma) transitions used for calibration 2348600200006 (R,,G.E.Thomas+,J,NIM,56,325,1967) 2348600200007 4444. keV B-10(N,G) transition intensity 2348600200008 MONITOR (7-N-14(N,G)7-N-15,,SIG,,SPA) 2348600200009 4509.keV gamma intensity 16.6+-0.3 % . 2348600200010 Peak area 4950+-118 counts . 2348600200011 MONIT-REF (,S.F.Mughabghab+,B,NEUT.CS 1A,,,1981) 2348600200012 SAMPLE Un-polarized. Boron nitride BN, 42 wt % natural boron,2348600200013 53 wt % natural nitrogen, 1.5-2.5 wt % boric acid, 2348600200014 small amounts of chlorine and carbon. 2348600200015 DETECTOR (HPGE) Relative intensity 5%. 2348600200016 (NAICR) Two NaI(Tl) crystals in coincidence with HPGe 2348600200017 detector. 2348600200018 N-14(n,gamma) reaction was used for calibration. 2348600200019 . Detector resolution (from fitted curve) - E-RSL,keV 2348600200020 Egamma,keV Exp.FWHM,keV E-RSL,keV 2348600200021 4444.03 6.11(22) 3.82 2348600200022 5269.07 4.24(10) 4.19 2348600200023 5297.66 4.86(14) 4.20 2348600200024 6322.25 6.09(19) 4.67 2348600200025 6738.34 6.59(34) 4.87 2348600200026 8309.81 5.36(30) 5.60 2348600200027 8916.80 6.49(23) 5.89 2348600200028 9148.62 6.81(73) 6.00 2348600200029 METHOD (COINC) Triple coincidence. 2348600200030 Measuring time up to 1300 hr . 2348600200031 . Energy range 0.3 - 3.9 MeV : HPGe operating in single2348600200032 mode during 24 hr; natural B sample, spectrum was 2348600200033 calibrated with Cl-35(n,gamma) transitions using 2348600200034 Fe(2)Cl(3) crystal as sample. 2348600200035 ANALYSIS B-10 capture cross section was measured relative to 2348600200036 N-14 capture cross section assuming 65(3)% and 16.6(3)%2348600200037 as the B-11 4444 keV and N-15 4509 keV gamma 2348600200038 intensities, respectively. 2348600200039 CORRECTION For background, determined by dummy-carbon target; 2348600200040 7.631 and 7.645 MeV doublets of Fe used. 2348600200041 Correction related to zero-point and gain shape. 2348600200042 Correction for background due to nitrogen in air - 2348600200043 13.(1) % . 2348600200044 ADD-RES . Q value was calculated from measured energies to be 2348600200045 11454.1+-0.2 keV (190 eV stat., 31 eV systematical) 2348600200046 . B-11 decay scheme on fig.2 2348600200047 ERR-ANALYS (DATA-ERR) Quadrratically compounded errors. 2348600200048 COMMENT Of compiler M.M. Incident neutron energy is not given 2348600200049 in the article, assumed by compiler to be thermal. 2348600200050 STATUS (TABLE) Text, page 274 of Z.Phys.A,324,271,1986 2348600200051 (DEP,23486003) Measured gamma intensities 2348600200052 ENDBIB 50 0 2348600200053 COMMON 2 3 2348600200054 MONIT MONIT-ERR 2348600200055 MB MB 2348600200056 75. 7.5 2348600200057 ENDCOMMON 3 0 2348600200058 DATA 3 1 2348600200059 EN-DUMMY DATA DATA-ERR 2348600200060 EV B B 2348600200061 0.0253 0.29 0.04 2348600200062 ENDDATA 3 0 2348600200063 ENDSUBENT 62 0 2348600299999 SUBENT 23486003 20190303 22802348600300001 BIB 10 36 2348600300002 REACTION (5-B-10(N,G)5-B-11,,SPC,,SPA) 2348600300003 REL-REF (R,,B.Krusche+,J,NP/A,386,245,1982) 2348600300004 Cl-35(n,gamma) transitions used for calibration 2348600300005 (R,,G.E.Thomas+,J,NIM,56,325,1967) 2348600300006 4444. keV B-10(N,G) transition intensity 2348600300007 MONITOR (7-N-14(N,G)7-N-15,,SPC,,SPA) 2348600300008 4509.keV gamma intensity 16.6+-0.3 % . 2348600300009 Peak area 4950+-118 counts . 2348600300010 SAMPLE Un-polarized. Boron nitride BN, 42 wt % natural boron,2348600300011 53 wt % natural nitrogen, 1.5-2.5 wt % boric acid, 2348600300012 small amounts of chlorine and carbon. 2348600300013 DETECTOR (HPGE) Relative intensity 5%. 2348600300014 (NAICR) Two NaI(Tl) crystals in coincidence with HPGe 2348600300015 detector. 2348600300016 N-14(n,gamma) reaction was used for calibration. 2348600300017 . Detector resolution (from fitted curve) - E-RSL,keV 2348600300018 Egamma,keV Exp.FWHM,keV E-RSL,keV 2348600300019 4444.03 6.11(22) 3.82 2348600300020 5269.07 4.24(10) 4.19 2348600300021 5297.66 4.86(14) 4.20 2348600300022 6322.25 6.09(19) 4.67 2348600300023 6738.34 6.59(34) 4.87 2348600300024 8309.81 5.36(30) 5.60 2348600300025 8916.80 6.49(23) 5.89 2348600300026 9148.62 6.81(73) 6.00 2348600300027 METHOD (COINC) Triple coincidence. 2348600300028 Measuring time up to 1300 hr . 2348600300029 CORRECTION For background, determined by dummy-carbon target; 2348600300030 7.631 and 7.645 MeV doublets of Fe used. 2348600300031 Correction related to zero-point and gain shape. 2348600300032 Correction for background due to nitrogen in air - 2348600300033 13.(1) % . 2348600300034 ERR-ANALYS (DATA-ERR) Type of error is not explained in article 2348600300035 COMMENT Of compiler M.M. Incident neutron energy is not given 2348600300036 in the article, assumed by compiler to be thermal. 2348600300037 STATUS (TABLE) Table 2 of Z.Phys.A,324,271,1986 2348600300038 ENDBIB 36 0 2348600300039 COMMON 1 3 2348600300040 EN-DUMMY 2348600300041 EV 2348600300042 0.0253 2348600300043 ENDCOMMON 3 0 2348600300044 DATA 4 8 2348600300045 E E-ERR DATA DATA-ERR 2348600300046 KEV KEV PC/REAC PC/REAC 2348600300047 2296.61 0.59 7. 4. 2348600300048 2533.49 0.23 12. 4. 2348600300049 4444.03 0.12 67. 4. 2348600300050 4711.17 0.10 28. 2. 2348600300051 6738.34 0.50 19. 2. 2348600300052 7006.75 0.10 56. 2. 2348600300053 8916.80 0.27 13. 1. 2348600300054 11447.35 0.52 4.6 0.3 2348600300055 ENDDATA 10 0 2348600300056 ENDSUBENT 55 0 2348600399999 SUBENT 23486004 20201005 22932348600400001 BIB 11 43 2348600400002 REACTION (5-B-10(N,A)3-LI-7,LON,POL,,DSP/ASY/MSC) 2348600400003 Spin-spin asymmetry for longitudinal spin states at 2348600400004 0 and 90 deg for (n,a) reaction 2348600400005 REL-REF (N,,J.F.A.G.Ruyl+,J,NP/A,419,439,1984) 2348600400006 Ti-49 measurement. 2348600400007 INC-SOURCE (POLNS) Polarized by Bragg reflection from magnetized 2348600400008 Cu(2)MnAl Heusler single crystal. 2348600400009 Spin flipper. 2348600400010 (POLTR) Polarized by cryogenity, temperature ~ 15 mK . 2348600400011 SAMPLE Polarized (14.6+-3.0 %) boron sample of 3.8 g. 2348600400012 90% B-10, 10% B-11. Molten with 99.9% pure Al. 2348600400013 2.51 cm diameter, 0.15 cm thickness. 2348600400014 Ti-49 target was mounted against the Al(B) target. 2348600400015 DETECTOR (GELI) . At 0 and 90 degrees relative to polarizing 2348600400016 magnetic field . Relative efficiency 15 % , 2348600400017 FWHM at 1.33 MeV - 2.6 keV and 2.7 keV for vertical and2348600400018 horizontal detector, respectively. 2348600400019 478 keV gamma emitted by excited Li-7 was used to 2348600400020 determine detectors response. 2348600400021 (FISCH) Fission counter for total neutron flux; 2348600400022 placed behind the sample. 2348600400023 (BF3) 2nd Heusler crystal and BF3 counter, placed 2348600400024 behind the target, - to determine neutron polarization.2348600400025 METHOD Spectra in 2560 channels in energy region 250-640 keV 2348600400026 were measured at two angles. 2348600400027 ANALYSIS Relative asymmetry e(THETA) at angle THETA was defined2348600400028 e(THETA)= 2348600400029 (I(THETA)par-I(THETA)anti)/(I(THETA)par+I(THETA)anti),2348600400030 where I(THETA) is counting rate with target and neutron2348600400031 spin parallel (par) and antiparallel (anti) . 2348600400032 e(0deg)=e(90deg)=0.070(2) was derived from the peak 2348600400033 area of the 478 keV transition. 2348600400034 CORRECTION For background due to the presence of boron in 2348600400035 the shielding material of the reactor and due to the 2348600400036 neutron-scattering in the target. 2348600400037 ERR-ANALYS (DATA-ERR) Type of error is not explained in article 2348600400038 STATUS (TABLE) Text, page 280 of Z.Phys.A,324,271,1986 2348600400039 HISTORY (20201005A) M.M. Data value was corrected 2348600400040 0.070 -> -0.070, 2348600400041 reaction was corrected: 2348600400042 PAR/LON,POL,,DSP/ASY -> LON,POL,,DSP/ASY/MSC, 2348600400043 E=LVL=478.keV was deleted from DATA block, 2348600400044 according to a comment on N.Otsuka (NDS,IAEA). 2348600400045 ENDBIB 43 0 2348600400046 COMMON 5 3 2348600400047 EN POL-BM POL-BM-ERR POL-TR POL-TR-ERR 2348600400048 EV NO-DIM NO-DIM NO-DIM NO-DIM 2348600400049 0.088 0.71 0.03 0.146 0.030 2348600400050 ENDCOMMON 3 0 2348600400051 DATA 2 1 2348600400052 DATA DATA-ERR 2348600400053 NO-DIM NO-DIM 2348600400054 -0.070 0.002 2348600400055 ENDDATA 3 0 2348600400056 ENDSUBENT 55 0 2348600499999 ENDENTRY 4 0 2348699999999