ENTRY C2647 20210627 C205C264700000001 SUBENT C2647001 20210627 C205C264700100001 BIB 9 28 C264700100002 TITLE Observation of Antiprotons C264700100003 AUTHOR (O.Chamberlain,E.Segre,C.Wiegand,T.Ypsilantis) C264700100004 REFERENCE (J,PR,100,947,1955) C264700100005 #doi:10.1103/PhysRev.100.947 C264700100006 INSTITUTE (1USABRK,1USAUCX) C264700100007 FACILITY (SYNCH,1USABRK) Bevatron, a weak-focusing proton C264700100008 synchrotron. C264700100009 DETECTOR (SCIN,CEREN) Plastic scintillator and Cherenkov C264700100010 counters. C264700100011 METHOD (TOF) The Bevatron proton beam impinges on a copper C264700100012 target and negative particles scattered in the C264700100013 forward direction with momentum 1.19 BeV/c. These C264700100014 particles are deflected 21 degrees by the field of C264700100015 the Bevatron, arid an additional 32 degrees by magnet C264700100016 M1. With the aid of the quadrupole focusing magnet Q1 C264700100017 (consisting of 3 consecutive quadrupole magnets) C264700100018 these particles are brought to a focus at the first C264700100019 scintillation counter. For protons of our selected C264700100020 momentum the mass is measured to about 10 percent. C264700100021 The observed times of flight for antiprotons are made C264700100022 more meaningful by the fact that the electronic gate C264700100023 time is considerably longer than the spread of C264700100024 observed antiproton flight times. A very rough C264700100025 determination has been made of the dependence of C264700100026 antiproton production cross section on the energy of C264700100027 the Bevatron proton beam. C264700100028 ERR-ANALYS (DATA-ERR) No details on sources of uncertainties. C264700100029 HISTORY (20210627C) BP C264700100030 ENDBIB 28 0 C264700100031 NOCOMMON 0 0 C264700100032 ENDSUBENT 31 0 C264700199999 SUBENT C2647002 20210627 C205C264700200001 BIB 2 2 C264700200002 REACTION ((29-CU-0(P,X)1-AP-1,,PY)/(29-CU-0(P,X)1-PN-0,,PY)) C264700200003 STATUS (CURVE) Fig. 5, page 949. C264700200004 ENDBIB 2 0 C264700200005 NOCOMMON 0 0 C264700200006 DATA 4 3 C264700200007 EN EN-ERR DATA DATA-ERR C264700200008 GEV GEV NO-DIM NO-DIM C264700200009 4.255 0.095 0.001E-05 0.192E-05 C264700200010 4.953 0.156 0.785E-05 0.471E-05 C264700200011 6.198 0.108 2.273E-05 0.301E-05 C264700200012 ENDDATA 5 0 C264700200013 ENDSUBENT 12 0 C264700299999 ENDENTRY 2 0 C264799999999