ENTRY 23497 20190303 22802349700000001 SUBENT 23497001 20190303 22802349700100001 BIB 10 30 2349700100002 TITLE Subthreshold neutron-induced fission of aligned 237Np 2349700100003 nuclei 2349700100004 AUTHOR (R.Kuiken,N.J.Pattenden,H.Postma) 2349700100005 REFERENCE (J,NP/A,196,389,1972) 2349700100006 REL-REF (I,,N.J.Pattenden+,J,NP/A,167,225,1971) 2349700100007 INSTITUTE (2NEDLEI) R.Kuiken 2349700100008 (2UK HAR) N.J.Pattenden 2349700100009 (2NEDKVI) H.Postma 2349700100010 FACILITY (LINAC,2UK HAR) 45 MeV electron linear accelerator 2349700100011 with neutron booster target and flight path 10.0 m . 2349700100012 Repetition rate 192 pulses per sec, pulse width 2349700100013 1/4 or 1/2 microsec. 2349700100014 SAMPLE Slabs from single RbUO(2)(NO(3))(3) crystal 2349700100015 (abbreviation RNU) and growing thin layers of 2349700100016 crystal RbNpO(2)(NO(3))(3) ( abbreviation RNN ) 2349700100017 on the natural faces of slabs. Glued on both sides 2349700100018 of a copper cooling plate. Placed perpendicular to 2349700100019 neutron beam. 2349700100020 Sample A - 26 crystals , total weight 35.6 mg Np-237, 2349700100021 average thickness 1.88 mg 237Np/cm2 . 2349700100022 Sample B - 24 crystals, total weight 23.5 mg Np-237, 2349700100023 average thickness 1.19 mg 237Np/cm2 . 2349700100024 Sample temperature 0.1 K -measured with a calibrated 2349700100025 carbon resistor. 2349700100026 DETECTOR Four diffused junction detectors, placed at 0 and 2349700100027 90 degrees direction. 2349700100028 METHOD (TOF) Four TOF spectra of 4096 channels for four pairs 2349700100029 of detector were measured. 2349700100030 Measurement time 8 months during 1.5 year. 2349700100031 HISTORY (20190303C) M.M. 2349700100032 ENDBIB 30 0 2349700100033 NOCOMMON 0 0 2349700100034 ENDSUBENT 33 0 2349700199999 SUBENT 23497002 20190303 22802349700200001 BIB 6 32 2349700200002 REACTION (93-NP-237(N,0),,EN) 2349700200003 ANALYSIS A2 values ( coefficients of FF angular distribution in2349700200004 form SUM(f2*Ai*Pi), f2=-0.082+-0.004 ) were calculated 2349700200005 from experimental anisotropies using f2 parameter and 2349700200006 average values of P2(COS(angle)) for 0 and 90 degrees .2349700200007 MISC-COL (MISC1) A2 for sample A 2349700200008 (MISC2) A2 for sample B 2349700200009 (MISC) Average A2 2349700200010 (MISC3) Systematical error of MISC 2349700200011 ERR-ANALYS (MISC1-ERR) Statistical error 2349700200012 (MISC2-ERR) Statistical 2349700200013 (MISC-ERR) Statistical 2349700200014 ADD-RES Data Legendre polinomials ( Table 1 ) : 2349700200015 2349700200016 Sample A 0.682 +- 0.060 -0.183 +- 0.060 2349700200017 Sample B 0.765 +- 0.050 -0.265 +- 0.050 2349700200018 Single crystal 0.883 +- 0.030 -0.383 +- 0.030 2349700200019 Data (A2) for unresolved resonances groups (Table 3): 2349700200020 E,eV Sample A Sample B Average 2349700200021 A2 +-stat. A2 +-stat. A2 +-stat. +-syst. 2349700200022 40. 2.49 +- 0.30 2.63 +- 0.30 2.56 +- 0.21 +- 0.5 2349700200023 120. 1.61 +- 1.15 1.38 +- 1.12 1.50 +- 0.80 +- 0.5 2349700200024 200. -0.02 +- 0.80 -0.25 +- 0.82 -0.13 +- 0.57 +- 0.4 2349700200025 230. 1.80 +- 2.15 1.85 +- 1.95 1.84 +- 1.45 +- 0.8 2349700200026 250. 0.29 +- 1.88 -0.30 +- 1.79 -0.02 +- 1.30 +- 0.8 2349700200027 280. 2.13 +- 2.15 -2.16 +- 2.83 0.57 +- 1.72 +- 0.9 2349700200028 365. 2.84 +- 1.75 -0.40 +- 2.05 1.47 +- 1.34 +- 0.9 2349700200029 420. -0.83 +- 2.50 0.21 +- 2.84 -0.37 +- 1.87 +- 1.2 2349700200030 850. 1.44 +- 2.50 2.26 +- 2.42 1.86 +- 1.74 +- 1.3 2349700200031 1100. -1.53 +- 2.56 0.64 +- 2.70 -0.51 +- 1.85 +- 1.3 2349700200032 1240. -1.72 +- 2.35 -2.26 +- 2.72 -1.95 +- 1.78 +- 1.3 2349700200033 STATUS (TABLE) Table 3 of Nucl.Phys.A,v.196,p.389,1972 2349700200034 ENDBIB 32 0 2349700200035 NOCOMMON 0 0 2349700200036 DATA 8 8 2349700200037 DATA MISC1 MISC1-ERR MISC2 MISC2-ERR MISC 2349700200038 MISC-ERR MISC3 2349700200039 EV NO-DIM NO-DIM NO-DIM NO-DIM NO-DIM 2349700200040 NO-DIM NO-DIM 2349700200041 26.6 1.21 2.06 3.91 1.50 2.98 2349700200042 1.21 0.7 2349700200043 30.5 3.23 0.70 3.71 0.63 3.50 2349700200044 0.47 0.3 2349700200045 37.3 0.90 1.45 0.40 1.29 0.62 2349700200046 0.97 0.4 2349700200047 39.2 1.35 0.65 2.26 0.63 1.82 2349700200048 0.45 0.3 2349700200049 40.0 2.71 0.37 2.75 0.37 2.73 2349700200050 0.26 0.3 2349700200051 41.4 3.06 0.64 1.63 0.65 2.36 2349700200052 0.46 0.3 2349700200053 46.1 1.20 1.49 1.90 1.35 1.57 2349700200054 1.00 0.5 2349700200055 50.7 2.35 1.80 3.73 1.32 3.25 2349700200056 1.06 0.6 2349700200057 ENDDATA 20 0 2349700200058 ENDSUBENT 57 0 2349700299999 ENDENTRY 2 0 2349799999999