ENTRY C2643 20210627 C205C264300000001 SUBENT C2643001 20210627 C205C264300100001 BIB 10 21 C264300100002 TITLE Small-Angle p-p Cross Sections and Polarization at C264300100003 300 Mev C264300100004 AUTHOR (O.Chamberlain,G.Pettengill,E.Segre,C.Wiegand) C264300100005 REFERENCE (J,PR,95,1348,1954) C264300100006 #doi:10.1103/PhysRev.95.1348 C264300100007 INSTITUTE (1USABRK,1USAUCX) C264300100008 FACILITY (SYNCY,1USABRK) C264300100009 INC-SOURCE (POLIS) The 312-MeV polarized proton beam. C264300100010 SAMPLE A liquid hydrogen target. C264300100011 DETECTOR Three counters. Counter No 3 is a symmetrical ring, C264300100012 divided into two parts along a vertical diameter C264300100013 parallel to polarization of the incident beam. C264300100014 METHOD (COINC) Protons scattered into the left and right C264300100015 halves of counter No. 3 were counted independently, C264300100016 each in coincidence with counters Nos. 1 and 2. A C264300100017 typical value of the fraction of protons scattered C264300100018 into one-half of the counter by the 2.80 grams per C264300100019 square centimeter of hydrogen in the target was C264300100020 2x10**-4. At each angle, data were taken with the C264300100021 target both full and empty. C264300100022 HISTORY (20210627C) BP C264300100023 ENDBIB 21 0 C264300100024 COMMON 1 3 C264300100025 EN C264300100026 MEV C264300100027 300.0 C264300100028 ENDCOMMON 3 0 C264300100029 ENDSUBENT 28 0 C264300199999 SUBENT C2643002 20210627 C205C264300200001 BIB 6 12 C264300200002 REACTION (1-H-1(P,EL)1-H-1,,DA) C264300200003 MONITOR (1-H-1(P,EL)1-H-1,,DA) C264300200004 MONIT-REF (C2637002,O.Chamberlain+,J,PR,93,1424(1),1954) C264300200005 ANALYSIS The cross section was obtained by adding the C264300200006 fractions of the beam scattered by hydrogen into the C264300200007 two halves of counter No 3 and multiplying this by the C264300200008 appropriate geometrical factors for each angle. Since C264300200009 the relative accuracy is better than the absolute, C264300200010 the values have been adjusted to give 3.7x10**-27 cm2 C264300200011 per steradian at 20 degrees (center of mass). C264300200012 ERR-ANALYS (ERR-S) Statistical errors only. C264300200013 STATUS (CURVE) Fig. 2, page 1348. C264300200014 ENDBIB 12 0 C264300200015 NOCOMMON 0 0 C264300200016 DATA 4 7 C264300200017 ANG-CM ANG-ERR DATA-CM ERR-S C264300200018 ADEG ADEG MB/SR MB/SR C264300200019 6.515 1.042 10.286 0.779 C264300200020 7.590 1.303 7.279 0.612 C264300200021 8.697 1.498 4.745 0.417 C264300200022 10.847 4.268 0.334 C264300200023 13.062 4.070 C264300200024 17.329 3.785 C264300200025 21.726 3.639 C264300200026 ENDDATA 9 0 C264300200027 ENDSUBENT 26 0 C264300299999 SUBENT C2643003 20210627 C205C264300300001 BIB 4 14 C264300300002 REACTION (1-H-1(P,EL)1-H-1,,POL/DA,,ANA) C264300300003 ANALYSIS The asymmetry was obtained from the formula, e = [(fl- C264300300004 fr)/(fl+fr)]*(phi*sin phi), where fl, fr are the C264300300005 fractions of beam protons scattered into the left and C264300300006 right sides of counter No 3, respectively, and 2*phi isC264300300007 the azimuthal angle covered by either half of C264300300008 counter. Since the beam polarization has been C264300300009 previously measured in elastic scattering experiments, C264300300010 we may calculate directly the polarizations arising C264300300011 from the p-p scattering in this experiment through C264300300012 the relation P=e/Pb, where Pb has been taken to be C264300300013 0.74+-0.01. C264300300014 ERR-ANALYS (DATA-ERR) No details on sources of uncertainties. C264300300015 STATUS (CURVE) Fig. 3, page 1349. C264300300016 ENDBIB 14 0 C264300300017 NOCOMMON 0 0 C264300300018 DATA 3 6 C264300300019 ANG-CM DATA DATA-ERR C264300300020 ADEG NO-DIM NO-DIM C264300300021 7.500 0.107 0.133 C264300300022 8.426 0.020 0.132 C264300300023 10.954 0.190 0.071 C264300300024 13.102 0.256 0.051 C264300300025 17.599 0.246 0.036 C264300300026 21.654 0.363 0.039 C264300300027 ENDDATA 8 0 C264300300028 ENDSUBENT 27 0 C264300399999 ENDENTRY 3 0 C264399999999