ENTRY C2650 20210713 C205C265000000001 SUBENT C2650001 20210713 C205C265000100001 BIB 10 16 C265000100002 TITLE Antineutron Production by Charge Exchange C265000100003 AUTHOR (J.Button,T.Elioff,E.Segre,H.M.Steiner,R.Weingart, C265000100004 C.Wiegand,T.Ypsilantis) C265000100005 REFERENCE (J,PR,108,1557,1957) C265000100006 #doi:10.1103/PhysRev.108.1557 C265000100007 REL-REF (I,C2651001,L.E.Agnew+,J,PR,108,1545,1957) A system of C265000100008 analyzing magnets and counters. C265000100009 INSTITUTE (1USABRK) C265000100010 FACILITY (SYNCH,1USABRK) Bevatron, a weak-focusing proton C265000100011 synchrotron. C265000100012 DETECTOR (SCIN,CEREN) Cerenkov counter which contained 11.07 C265000100013 g/cm2 of methyl alcohol, CH3OH. C265000100014 METHOD The antineutrons were detected by their energy C265000100015 release upon annihilation. C265000100016 ERR-ANALYS (DATA-ERR) No details on sources of uncertainties. C265000100017 HISTORY (20210713C) BP C265000100018 ENDBIB 16 0 C265000100019 NOCOMMON 0 0 C265000100020 ENDSUBENT 19 0 C265000199999 SUBENT C2650002 20210713 C205C265000200001 BIB 4 15 C265000200002 REACTION (6-C-CMP(AP,X)0-AN-1,,SIG) C265000200003 SAMPLE 21.4 g/cm2 of CH2. C265000200004 ANALYSIS The charge-exchange cross sections were determined C265000200005 from the expression: sigma c = (I(AN)/(I(AP)*Ntargt))* C265000200006 exp(Ntarget*sigma target + Nsc*sigma sc + NPb*sigma Pb)C265000200007 where sigma c = charge-exchange cross section per C265000200008 molecule for production of antineutrons into a solid C265000200009 angle of 0.275 steradian in the forward direction, C265000200010 I(AP) total number of antiprotons incident on the C265000200011 target, I(AN) total number of antineutrons observed in C265000200012 counter D, exp(Ntarget*sigma target), exp(Nsc*sigma sc)C265000200013 , and exp(NPb*sigma Pb) are the attenuations in the C265000200014 target, the scintillation counters, and the 1.5-in. Pb C265000200015 converter, respectively. C265000200016 STATUS (TABLE) Table I, page 1560. C265000200017 ENDBIB 15 0 C265000200018 NOCOMMON 0 0 C265000200019 DATA 4 1 C265000200020 EN DATA +DATA-ERR -DATA-ERR C265000200021 MEV MB MB MB C265000200022 455.0 10.0 2.8 2.8 C265000200023 ENDDATA 3 0 C265000200024 ENDSUBENT 23 0 C265000299999 SUBENT C2650003 20210713 C205C265000300001 BIB 4 15 C265000300002 REACTION (6-C-0(AP,X)0-AN-1,,SIG) C265000300003 SAMPLE 44 g/cm2. C265000300004 ANALYSIS The charge-exchange cross sections were determined C265000300005 from the expression: sigma c = (I(AN)/(I(AP)*Ntargt))* C265000300006 exp(Ntarget*sigma target + Nsc*sigma sc + NPb*sigma Pb)C265000300007 where sigma c = charge-exchange cross section per C265000300008 molecule for production of antineutrons into a solid C265000300009 angle of 0.275 steradian in the forward direction, C265000300010 I(AP) total number of antiprotons incident on the C265000300011 target, I(AN) total number of antineutrons observed in C265000300012 counter D, exp(Ntarget*sigma target), exp(Nsc*sigma sc)C265000300013 , and exp(NPb*sigma Pb) are the attenuations in the C265000300014 target, the scintillation counters, and the 1.5-in. Pb C265000300015 converter, respectively. C265000300016 STATUS (TABLE) Table I, page 1560. C265000300017 ENDBIB 15 0 C265000300018 NOCOMMON 0 0 C265000300019 DATA 4 1 C265000300020 EN DATA +DATA-ERR -DATA-ERR C265000300021 MEV MB MB MB C265000300022 434.0 4.0 1.6 1.5 C265000300023 ENDDATA 3 0 C265000300024 ENDSUBENT 23 0 C265000399999 SUBENT C2650004 20210713 C205C265000400001 BIB 4 15 C265000400002 REACTION (82-PB-0(AP,X)0-AN-1,,SIG) C265000400003 SAMPLE 86.4 g/cm2. C265000400004 ANALYSIS The charge-exchange cross sections were determined C265000400005 from the expression: sigma c = (I(AN)/(I(AP)*Ntargt))* C265000400006 exp(Ntarget*sigma target + Nsc*sigma sc + NPb*sigma Pb)C265000400007 where sigma c = charge-exchange cross section per C265000400008 molecule for production of antineutrons into a solid C265000400009 angle of 0.275 steradian in the forward direction, C265000400010 I(AP) total number of antiprotons incident on the C265000400011 target, I(AN) total number of antineutrons observed in C265000400012 counter D, exp(Ntarget*sigma target), exp(Nsc*sigma sc)C265000400013 , and exp(NPb*sigma Pb) are the attenuations in the C265000400014 target, the scintillation counters, and the 1.5-in. Pb C265000400015 converter, respectively. C265000400016 STATUS (TABLE) Table I, page 1560. C265000400017 ENDBIB 15 0 C265000400018 NOCOMMON 0 0 C265000400019 DATA 4 1 C265000400020 EN DATA +DATA-ERR -DATA-ERR C265000400021 MEV MB MB MB C265000400022 426.0 3.8 4.2 2.5 C265000400023 ENDDATA 3 0 C265000400024 ENDSUBENT 23 0 C265000499999 SUBENT C2650005 20210713 C205C265000500001 BIB 3 6 C265000500002 REACTION (1-H-1(AP,N)0-AN-1,,SIG) C265000500003 ANALYSIS A value for sigma(AP+P->AN+N) can be obtained from C265000500004 the CH4 and C data by subtraction. C265000500005 STATUS (DEP,C2650002) C265000500006 (DEP,C2650003) C265000500007 (TABLE) page 1560. C265000500008 ENDBIB 6 0 C265000500009 NOCOMMON 0 0 C265000500010 DATA 3 1 C265000500011 EN-MAX DATA DATA-ERR C265000500012 MEV MB MB C265000500013 440.0 3.0 1.6 C265000500014 ENDDATA 3 0 C265000500015 ENDSUBENT 14 0 C265000599999 ENDENTRY 5 0 C265099999999