ENTRY M0338 20100127 M051M033800000001 SUBENT M0338001 20100127 M051M033800100001 BIB 15 34 M033800100002 TITLE Energy spectrum and polarization of photoneutrons M033800100003 from Be-9. M033800100004 AUTHOR (A.DE MARCO,R.GARFAGNINI,G.PIRAGINO) M033800100005 INSTITUTE (2ITYTUR) M033800100006 REFERENCE (J,NC/B,42,355,1966) M033800100007 FACILITY (SYNCH,2ITYTUR) M033800100008 INC-SOURCE (BRST) M033800100009 SAMPLE The target of 5*5*10 cm**3 size has the 10 cm side M033800100010 parallel to the direction of the gamma-ray beam. M033800100011 METHOD (REC) M033800100012 PART-DET (A) M033800100013 DETECTOR (TRD) Diffusion cloud chamber filled with helium at M033800100014 2.4 absolute atmospheres. M033800100015 ERR-ANALYS (ERR-S) Statistical errors of measurement. M033800100016 (E-ERR) Half of range of experimental histogram. M033800100017 COMMENT The energy spectrum and polarization of photoneutrons M033800100018 from Be-9 at 135 degrees at the bremsstrahlung M033800100019 endpoint energy = 85 MeV were measured. It was M033800100020 shown, that the high value of the polarization of M033800100021 the photoneutrons with energy greater than 1 MeV and M033800100022 less than 3 MeV cannot be explained only by the M033800100023 contribution of the Be-9 valence neutron. It was M033800100024 concluded that there is a noticeable contribution to M033800100025 the polarization from neutrons emitted in the M033800100026 processes involving the Be-9 core. M033800100027 REL-REF (N,,A.DE MARCO+,J,AAST,99,445,1965). The details of M033800100028 the experimental method. M033800100029 STATUS (CURVE) M033800100030 HISTORY (19890508C) Data were compiled in SCJAD of Saratov M033800100031 State University. M033800100032 (19910202A) Corrected by V.Varlamov, V.Mclane M033800100033 (20091001A) Correction of AUTHOR - G.PIRAGINO, M033800100034 dates, lowercase, ERR-S in SUBENTs 2, 3, REACTION M033800100035 SF5-6 in SUBENT 3. M033800100036 ENDBIB 34 0 M033800100037 COMMON 2 3 M033800100038 ANG EN-MAX M033800100039 ADEG MEV M033800100040 135. 85. M033800100041 ENDCOMMON 3 0 M033800100042 ENDSUBENT 41 0 M033800199999 SUBENT M0338002 20100127 M051M033800200001 BIB 3 7 M033800200002 REACTION (4-BE-9(G,X)0-NN-1,,DA/DE,,BRS/REL) M033800200003 ANALYSIS Data were deduced from the spectrum of the recoil M033800200004 alpha-particles. M033800200005 CORRECTION the energy distribution was corrected for: M033800200006 (a) the geometric losses; M033800200007 (b) the energy dependence of the (n,a) elastic cross M033800200008 section. M033800200009 ENDBIB 7 0 M033800200010 COMMON 1 3 M033800200011 E-ERR M033800200012 MEV M033800200013 0.2 M033800200014 ENDCOMMON 3 0 M033800200015 DATA 3 35 M033800200016 E DATA ERR-S M033800200017 MEV ARB-UNITS ARB-UNITS M033800200018 1.0 73.2 5.7 M033800200019 1.4 91.5 6.1 M033800200020 1.8 85.4 6.5 M033800200021 2.2 70.3 7.7 M033800200022 2.6 56.5 6.1 M033800200023 3.0 38.2 4.9 M033800200024 3.4 36.2 4.5 M033800200025 3.8 26.0 4.1 M033800200026 4.2 26.0 4.1 M033800200027 4.6 21.5 4.5 M033800200028 5.0 21.1 4.1 M033800200029 5.4 19.5 3.7 M033800200030 5.8 12.2 3.3 M033800200031 6.2 15.5 3.3 M033800200032 6.6 11.4 3.3 M033800200033 7.0 12.2 3.7 M033800200034 7.4 6.5 2.9 M033800200035 7.8 5.7 2.4 M033800200036 8.2 7.3 2.4 M033800200037 8.6 6.9 2.4 M033800200038 9.0 4.5 2.4 M033800200039 9.4 5.7 2.4 M033800200040 9.8 4.1 2.9 M033800200041 10.2 2.9 2.0 M033800200042 10.6 2.4 1.6 M033800200043 11.0 3.7 2.0 M033800200044 11.4 1.6 1.2 M033800200045 11.8 1.2 0.8 M033800200046 12.2 2.0 1.6 M033800200047 12.6 2.0 1.6 M033800200048 13.0 4.1 2.4 M033800200049 13.4 1.6 1.4 M033800200050 13.8 6.5 2.9 M033800200051 14.2 1.6 1.4 M033800200052 15.0 3.7 2.0 M033800200053 ENDDATA 37 0 M033800200054 ENDSUBENT 53 0 M033800299999 SUBENT M0338003 20100127 M051M033800300001 BIB 5 13 M033800300002 REACTION (4-BE-9(G,X)0-NN-1,,POL/DA/DE,,BRS/REL) M033800300003 Polarization. M033800300004 ANALYSIS Data were obtained with the maximum likelihood method. M033800300005 CORRECTION The polarization was corrected for the asymetry of M033800300006 apparatus. M033800300007 COMMENT To eliminate a possible asymetry of apparatus the M033800300008 polarization of neutrons coming from Ra d-Be source M033800300009 was measured. The data presented are equal to the M033800300010 difference between the value of the polarization due M033800300011 to photoneutrons coming from Be-9 and the value M033800300012 obtained from the source. M033800300013 HISTORY (20091001A) Because contituous spectrum PAR,POL/DA M033800300014 replaced by ,POL/DA/DE. M033800300015 ENDBIB 13 0 M033800300016 NOCOMMON 0 0 M033800300017 DATA 4 4 M033800300018 E E-ERR DATA ERR-S M033800300019 MEV MEV NO-DIM NO-DIM M033800300020 1.5 0.5 0.52 0.21 M033800300021 2.5 0.5 0.65 0.27 M033800300022 3.5 0.5 0.07 0.27 M033800300023 10.0 6.0 0.02 0.18 M033800300024 ENDDATA 6 0 M033800300025 ENDSUBENT 24 0 M033800399999 ENDENTRY 3 0 M033899999999