ENTRY 23143 20110808 22282314300000001 SUBENT 23143001 20110808 22282314300100001 BIB 13 60 2314300100002 TITLE Experimental Method for Neutron Elastic Scattering 2314300100003 Cross-Section Measurement in Intermediate Energy Region2314300100004 at RCNP. 2314300100005 AUTHOR (D.Satoh, Y.Iwamoto, M.Hagiwara, H.Iwase, H.Yashima, 2314300100006 T.Sanami, T.Sato, A.Endo, Y.Sakamoto, Y.Nakane, 2314300100007 H.Nakashima, T.Nakamura, A.Tamii, K.Hatanaka) 2314300100008 REFERENCE (J,NSTP,1,20,2011) 2314300100009 INSTITUTE (2JPNOSA) A.Tamii, K.Hatanaka. 2314300100010 (2JPNJAE) D.Satoh, Y.Iwamoto, T.Sato,A.Endo,Y.Sakamoto,2314300100011 Y.Nakane, H.Nakashima. 2314300100012 (2JPNKEK) M.Hagiwara, H.Iwase, T.Sanami. 2314300100013 (2JPNKTO) H.Yashima. 2314300100014 (2JPNTOH) H.Nakashima. 2314300100015 FACILITY (CYCLO,2JPNOSA) 2314300100016 INC-SOURCE (P-LI7) Proton beam of 137 MeV (maximum energy 400 MeV,2314300100017 Proton-beam current 700 nA) was transported to lithium 2314300100018 target (1.0 cm thickness) placed in beam-swinger magnet2314300100019 INC-SPECT Neutron flux is on Fig.1 of J,NSTP,1,20,2011. 2314300100020 Peak of quasi-monoenergetic neutrons was observed 2314300100021 around 134 MeV with FWHM of the peak 3.0 MeV, and the 2314300100022 intensity 1.05*10**10 neutrons/sr/microC. 2314300100023 Set of collimators was used. 2314300100024 DETECTOR (SCIN) Intensity and energy spectrum of source neutrons2314300100025 produced from the 7Li(p,n) reaction were measured by an2314300100026 NE213 liquid organic scintillator located in the 0.deg.2314300100027 direction and 15 m downstream from the target, with the2314300100028 TOF method. 2314300100029 NE213 liquid organic scintillators of 12.7 cm diameter 2314300100030 and 12.7 cm thickness were employed to detect the 2314300100031 scattering neutrons at three angles 6., 8., 15. degrees2314300100032 with 560-, 500-, and 400-cm flight-paths, respectively.2314300100033 Thin plastic scintillators were mounted in front of the2314300100034 NE213 scintillators as veto detectors to tag the 2314300100035 charged particles from the sample.Iron shadow blocks of2314300100036 60 cm along the beam axis, 100 cm horizontally 2314300100037 orthogonal to the beam axis, and 20 cm in height 2314300100038 centered on the beam . 2314300100039 Detection efficiencies were calculated with the 2314300100040 SCINFULQMD code. 2314300100041 Proton beam current measured by the Faraday cup. 2314300100042 SAMPLE Sample was set 10 m downstream from the lithium target.2314300100043 Cylindrical samples of natural carbon (5 cm diameter x 2314300100044 5 cm length) were used. 2314300100045 METHOD (TOF) Flight -path 15 m. 2314300100046 Background was measured without sample. 2314300100047 (PSD) Data on the pulse height, pulse shape, and TOF 2314300100048 (PHD) were acquired event by event. 2314300100049 Gamma-ray events were segregated from the neutron 2314300100050 events by PSD. 2314300100051 ANALYSIS (REDUC) By subtracting the background spectrum and 2314300100052 cutting off the low-TOF channels corresponding to the 2314300100053 inelastic events, the elastic scattering neutrons were 2314300100054 extracted. 2314300100055 CORRECTION The cross sections were corrected by 4.0%, 5.0% and 10%2314300100056 at 6., 8., and 15. degrees, respectively, for 2314300100057 contribution of low-excitation states of sample nucleus2314300100058 ,e.g. 2+ state at 4.44 MeV and 3- state at 9.64 MeV for2314300100059 carbon. Correction factors for this contribution were 2314300100060 estimated by a coupled-channels calculation. 2314300100061 HISTORY (20110808C) M.M. 2314300100062 ENDBIB 60 0 2314300100063 NOCOMMON 0 0 2314300100064 ENDSUBENT 63 0 2314300199999 SUBENT 23143002 20110808 22282314300200001 BIB 3 12 2314300200002 REACTION (6-C-0(N,EL)6-C-0,,DA) 2314300200003 REL-REF (A,13946002,J.H.Osborne+,J,PR/C,70,054613,2004) 2314300200004 Agreement with the UC Davis data at 127.5 MeV. 2314300200005 ENDF/B-VII.0 agrees well with the experimental data 2314300200006 in the forward angular region below 10 degrees in CM 2314300200007 system, while JENDL/HE-2007 gives about 30% lower 2314300200008 values. At angles over 10 degrees, ENDF/B-VII.0 2314300200009 underestimates the experimental data, and JENDL/HE-20072314300200010 agrees well. 2314300200011 STATUS (UNOBT) Data are on Fig.5 of J,NSTP,1,20,2011. 2314300200012 Request for the data was sent 08-08-2011 to Daiki Satoh2314300200013 satoh.daiki@jaea.go.jp . 2314300200014 ENDBIB 12 0 2314300200015 COMMON 1 3 2314300200016 EN 2314300200017 MEV 2314300200018 134. 2314300200019 ENDCOMMON 3 0 2314300200020 NODATA 0 0 2314300200021 ENDSUBENT 20 0 2314300299999 ENDENTRY 2 0 2314399999999