ENTRY 41786 20250915 4178600000001 SUBENT 41786001 20250915 20260228 4178600100001 BIB 11 53 4178600100002 TITLE Measurement of gamma-quanta angular distributions 4178600100003 emitted from neutron inelastic scattering on 28Si 4178600100004 AUTHOR (N.A.Fedorov,D.N.Grozdanov,V.M.Bystritskiy,Yu.N.Kopach,4178600100005 I.N.Ruskov,V.R.Skoy,T.Yu.Tretyakova,N.I.Zamyatin, 4178600100006 D.Wang,F.A.Aliev,C.Hramco,A.Gandhi,A.Kumar,S.Dabylova, 4178600100007 E.P.Bogolubov,Yu.N.Barmakov) 4178600100008 INSTITUTE (4ZZZDUB) N.A.Fedorov,D.N.Grozdanov,V.M.Bystritskiy, 4178600100009 Yu.N.Kopach,I.N.Ruskov,V.R.Skoy,N.I.Zamyatin, 4178600100010 D.Wang,F.A.Aliev,C.C.HramcoHramco,S.Dabylova 4178600100011 (4RUSMOS) N.A.Fedorov,T.Yu.Tretyakova 4178600100012 (3BULBLA) D.N.Grozdanov,I.N.Ruskov 4178600100013 (3CPRCPR) Xi'an Jiao Tong University, Xi'an, China 4178600100014 D.Wang 4178600100015 (4AZRAZR) Institute of Geology and Geophysics of 4178600100016 Azerbaijan National Academy of Science,Baku,Azerbaijan 4178600100017 F.A.Aliev 4178600100018 (4MLDMLD) Inst.of Chemistry of Moldova, Chisinau, 4178600100019 Republic of Moldova. 4178600100020 C.Hramco 4178600100021 (3INDBHU) A.Gandhi,A.Kumar 4178600100022 (4RUSRUS) All-Russia Research Institute of Automatics 4178600100023 (VNIIA), Moscow, Russia 4178600100024 E.P.Bogolubov,Yu.N.Barmakov 4178600100025 REFERENCE (J,EPJ/CS,177,02002,2018) 4178600100026 #doi:10.1051/epjconf/201817702002 4178600100027 FACILITY (NGEN,4ZZZDUB) Portable ING-27 neutron generator 4178600100028 at TANGRA (TAgged Neutrons and Gamma RAys) facility. 4178600100029 INC-SOURCE (D-T) d+t -> alpha(3.5 MeV) + n(14.1 MeV). 4178600100030 Maximal neutron flux ~5.10**7 n/sec. 4178600100031 SAMPLE .Natural silicon. Isotopic content: 4178600100032 Si-28 - 92.2 %, Si-29 - 4.7 %, Si-30 - 3.1 %. 4178600100033 METHOD (ASSOP) Tagged neutron method. 4178600100034 (COINC) Alpha - gamma coincidences. 4178600100035 (TOF) TOF method - to separate gamma-rays from neutron.4178600100036 DETECTOR (PS) Position-sensitive silicon detector for 4178600100037 alpha-particle registration, placed in the ING-27 4178600100038 neutron tube at a distance 100 mm from the target 4178600100039 consists of 16 (8+8) mutually perpendicular 4178600100040 semiconductor strips, each 6 mm wide and 55 mm long. 4178600100041 The overlapping strips form 64 (8x8) pixels with pixel 4178600100042 size of 6x6 mm. Only one pixel was used. 4178600100043 (NAICR) 22 scintillation NaI(Tl) detectors for gamma 4178600100044 registration 4178600100045 CORRECTION Background was measured in separate experiment without4178600100046 sample. 4178600100047 For random coincidences. 4178600100048 For neutrons scattered on sample and surrounding. 4178600100049 For gamma-quanta produced in interaction of neutrons 4178600100050 with environment. 4178600100051 HISTORY (20250915C) M.M. 4178600100052 Request of angular distributions (Fig.3) was sent 4178600100053 30-09-2025 to N.A.Fedorov,D.N.Grozdanov,Yu.N.Kopach. 4178600100054 (20251002R) Data were received from N.Fedorov. 4178600100055 ENDBIB 53 0 4178600100056 COMMON 1 3 4178600100057 EN 4178600100058 MEV 4178600100059 14.1 4178600100060 ENDCOMMON 3 0 4178600100061 ENDSUBENT 60 0 4178600199999 SUBENT 41786002 20250915 20260228 4178600200001 BIB 6 15 4178600200002 REACTION (14-SI-28(N,INL)14-SI-28,PAR,DA,G,LEG/RS) 4178600200003 EN-SEC (E,G) Transition from 1st excited state 2+ to the 4178600200004 ground state of Si-28. 4178600200005 ANALYSIS Angular anisotropy was approximated as: 4178600200006 1+SUM(ai*Pi(COS(angle)), where 4178600200007 i=2,4,..., 4178600200008 ai - coefficients of Legendre polynomials Pi. 4178600200009 ( this formula was received from the author N.Fedorov)4178600200010 REL-REF (A,32688001,H.Zhou+,J,NIM/A,648,192,2011) 4178600200011 (A,20493001,U.Abbondanno+,J,JNE,27,227,1973) 4178600200012 ERR-ANALYS (ERR-S) Statistical uncertainty 4178600200013 STATUS (TABLE,,N.A.Fedorov+,J,EPJ/CS,177,02002,2018) 4178600200014 Table on page 5 4178600200015 (DEP,41786003) In .003 - directly measured angular 4178600200016 distributions. 4178600200017 ENDBIB 15 0 4178600200018 COMMON 1 3 4178600200019 E 4178600200020 MEV 4178600200021 1.779 4178600200022 ENDCOMMON 3 0 4178600200023 DATA 3 2 4178600200024 NUMBER DATA ERR-S 4178600200025 NO-DIM NO-DIM NO-DIM 4178600200026 2. 0.19 0.02 4178600200027 4. 0.02 0.03 4178600200028 ENDDATA 4 0 4178600200029 ENDSUBENT 28 0 4178600299999 SUBENT 41786003 20250915 20260228 4178600300001 BIB 5 10 4178600300002 REACTION (14-SI-28(N,INL)14-SI-28,PAR,DA,G,RS) 4178600300003 EN-SEC (E,G) Transition from 1st excited state 2+ to the 4178600300004 ground state of Si-28. 4178600300005 REL-REF (A,32688001,H.Zhou+,J,NIM/A,648,192,2011) 4178600300006 (A,20493001,U.Abbondanno+,J,JNE,27,227,1973) 4178600300007 ERR-ANALYS (ERR-S) Statistical uncertainty 4178600300008 STATUS (TABLE,,N.A.Fedorov+,J,EPJ/CS,177,02002,2018) 4178600300009 Data from the author N.Fedorov. 4178600300010 (COREL,41786002) In .002 - Legendre polynomials 4178600300011 coefficients for approximation of angular anisotropy. 4178600300012 ENDBIB 10 0 4178600300013 COMMON 1 3 4178600300014 E 4178600300015 MEV 4178600300016 1.779 4178600300017 ENDCOMMON 3 0 4178600300018 DATA 3 11 4178600300019 ANG DATA ERR-S 4178600300020 ADEG NO-DIM NO-DIM 4178600300021 15. 1.27 0.07 4178600300022 30. 1.14 0.04 4178600300023 45. 1.11 0.04 4178600300024 60. 0.99 0.04 4178600300025 75. 0.9 0.03 4178600300026 90. 0.88 0.03 4178600300027 105. 0.99 0.04 4178600300028 120. 0.97 0.03 4178600300029 135. 1.05 0.04 4178600300030 150. 1.04 0.04 4178600300031 165. 1.18 0.04 4178600300032 ENDDATA 13 0 4178600300033 ENDSUBENT 32 0 4178600399999 ENDENTRY 3 0 4178699999999