ENTRY 23274 20150322 224923274 0 1 SUBENT 23274001 20150222 224923274 1 1 BIB 11 28 23274 1 2 TITLE First observation of beta-delayed two-neutron 23274 1 3 radioactivity: 11Li . 23274 1 4 AUTHOR (R.E.Azuma,L.C.Carraz,P.G.Hansen,B.Jonson,K.-L.Kratz, 23274 1 5 S.Mattsson,G.Nyman,H.Ohm,H.L.Ravn,A.Schroeder, 23274 1 6 W.Ziegert) 23274 1 7 INSTITUTE (2ZZZCER) The ISOLDE Collaboration. 23274 1 8 REFERENCE (J,PRL,43,1652,1979) 23274 1 9 FACILITY (SYNCY,2ZZZCER) ISOLDE facility at CERN 23274 1 10 synchrocyclotron . 23274 1 11 DECAY-DATA (3-LI-11,8.5MSEC) 8.5+-0.2 msec 23274 1 12 SAMPLE Li-11 was produced by bombarding a 12-g/cm2 uranium 23274 1 13 carbide at 2000 degC with 1.6-microA 600-MeV protons. 23274 1 14 Li atoms were mass separated . 23274 1 15 DETECTOR (IOCH) Three He-3 ionization chambers operated in 23274 1 16 parallel - to measure singles neutron spectrum. 23274 1 17 ADD-RES Data obtained in additional experiments: 23274 1 18 Fig.2 - distributions of time correlated n-n events in 23274 1 19 Li-11 experiment and with a 1.9-kg U-238 sample 23274 1 20 spon.fission; insert - Li-9 (175msec) showed no 23274 1 21 correlated events. 23274 1 22 Li-11 decay level scheme on Fig.1 right. 23274 1 23 Li-11 decay has 9+-3 % two-neutron events and 43+-9 % 23274 1 24 single-neutron events , assuming 61+-7 % for the total 23274 1 25 neutron intensity from : 23274 1 26 REL-REF (R,,E.Roeckl+,J,PR/C,10,1181,1974) 23274 1 27 HISTORY (20160322C) M.M. 23274 1 28 Digitized data were received from consultants of 23274 1 29 beta-delayed neutron CRP . 23274 1 30 ENDBIB 28 0 23274 1 31 NOCOMMON 0 0 23274 1 32 ENDSUBENT 31 0 23274 199999 SUBENT 23274002 20160322 224923274 2 1 BIB 3 4 23274 2 2 REACTION (3-LI-11(0,B-)4-BE-11,,PN/DE,,REL) 23274 2 3 Relative beta-delayed neutrons spectrum, counts. 23274 2 4 EN-SEC (E,N) Energy of delayed neutrons. 23274 2 5 STATUS (CURVE) Fig.1 left of PR/L,43,1652,1979 23274 2 6 ENDBIB 4 0 23274 2 7 NOCOMMON 0 0 23274 2 8 DATA 2 52 23274 2 9 E DATA 23274 2 10 MEV ARB-UNITS 23274 2 11 -5.534E-02 1.444E+03 23274 2 12 -1.479E-02 1.957E+04 23274 2 13 3.146E-02 2.086E+03 23274 2 14 8.403E-02 1.324E+03 23274 2 15 1.162E-01 7.495E+02 23274 2 16 1.679E-01 7.130E+02 23274 2 17 2.196E-01 6.530E+02 23274 2 18 2.714E-01 5.981E+02 23274 2 19 3.125E-01 6.216E+02 23274 2 20 3.384E-01 5.837E+02 23274 2 21 3.953E-01 5.346E+02 23274 2 22 4.419E-01 5.022E+02 23274 2 23 4.832E-01 4.717E+02 23274 2 24 5.352E-01 3.904E+02 23274 2 25 5.868E-01 3.809E+02 23274 2 26 6.232E-01 3.581E+02 23274 2 27 6.698E-01 2.971E+02 23274 2 28 7.242E-01 2.655E+02 23274 2 29 7.744E-01 2.580E+02 23274 2 30 8.127E-01 2.374E+02 23274 2 31 8.570E-01 2.283E+02 23274 2 32 9.051E-01 2.307E+02 23274 2 33 9.473E-01 2.219E+02 23274 2 34 1.002E+00 2.210E+02 23274 2 35 1.043E+00 2.393E+02 23274 2 36 1.074E+00 2.394E+02 23274 2 37 1.132E+00 2.129E+02 23274 2 38 1.184E+00 2.260E+02 23274 2 39 1.224E+00 2.495E+02 23274 2 40 1.264E+00 2.319E+02 23274 2 41 1.315E+00 2.092E+02 23274 2 42 1.363E+00 2.167E+02 23274 2 43 1.409E+00 2.054E+02 23274 2 44 1.445E+00 1.928E+02 23274 2 45 1.492E+00 1.731E+02 23274 2 46 1.538E+00 1.616E+02 23274 2 47 1.578E+00 1.458E+02 23274 2 48 1.629E+00 1.271E+02 23274 2 49 1.673E+00 1.119E+02 23274 2 50 1.723E+00 1.109E+02 23274 2 51 1.764E+00 1.083E+02 23274 2 52 1.802E+00 1.094E+02 23274 2 53 1.855E+00 1.464E+02 23274 2 54 1.894E+00 1.245E+02 23274 2 55 1.946E+00 1.423E+02 23274 2 56 1.992E+00 1.602E+02 23274 2 57 2.042E+00 1.475E+02 23274 2 58 2.083E+00 1.194E+02 23274 2 59 2.129E+00 9.293E+01 23274 2 60 2.172E+00 7.058E+01 23274 2 61 2.212E+00 6.305E+01 23274 2 62 2.267E+00 4.719E+01 23274 2 63 ENDDATA 54 0 23274 2 64 ENDSUBENT 63 0 23274 299999 SUBENT 23274003 20160322 224923274 3 1 BIB 3 4 23274 3 2 REACTION (3-LI-11(0,B-)4-BE-11,,PN/DE,,REL) 23274 3 3 Relative beta-delayed neutrons spectrum, counts. 23274 3 4 EN-SEC (E,N) Energy of delayed neutrons. 23274 3 5 STATUS (CURVE) Fig.1 left, insert of PR/L,43,1652,1979 23274 3 6 ENDBIB 4 0 23274 3 7 NOCOMMON 0 0 23274 3 8 DATA 2 48 23274 3 9 E DATA 23274 3 10 MEV ARB-UNITS 23274 3 11 -1.779E+01 2.084E+02 23274 3 12 -1.475E+01 3.502E+02 23274 3 13 -1.174E+01 7.115E+02 23274 3 14 -8.701E+00 1.196E+03 23274 3 15 -6.687E+00 1.816E+03 23274 3 16 -4.100E+00 2.224E+03 23274 3 17 -4.266E-01 2.340E+03 23274 3 18 2.745E+00 2.198E+03 23274 3 19 7.019E+00 1.644E+03 23274 3 20 9.692E+00 1.360E+03 23274 3 21 1.392E+01 1.230E+03 23274 3 22 1.500E+01 1.126E+03 23274 3 23 1.924E+01 9.677E+02 23274 3 24 2.298E+01 7.422E+02 23274 3 25 2.567E+01 5.838E+02 23274 3 26 2.786E+01 3.847E+02 23274 3 27 3.112E+01 2.440E+02 23274 3 28 3.440E+01 1.382E+02 23274 3 29 3.861E+01 1.418E+02 23274 3 30 4.025E+01 1.060E+02 23274 3 31 4.394E+01 1.034E+02 23274 3 32 4.607E+01 9.348E+01 23274 3 33 5.027E+01 9.838E+01 23274 3 34 5.344E+01 9.123E+01 23274 3 35 5.654E+01 1.206E+02 23274 3 36 5.921E+01 1.010E+02 23274 3 37 6.288E+01 1.050E+02 23274 3 38 6.653E+01 1.254E+02 23274 3 39 7.024E+01 1.134E+02 23274 3 40 7.125E+01 1.336E+02 23274 3 41 7.597E+01 1.443E+02 23274 3 42 7.760E+01 1.179E+02 23274 3 43 8.130E+01 1.093E+02 23274 3 44 8.499E+01 1.026E+02 23274 3 45 8.974E+01 1.001E+02 23274 3 46 9.395E+01 9.893E+01 23274 3 47 9.771E+01 7.123E+01 23274 3 48 9.821E+01 7.983E+01 23274 3 49 1.035E+02 6.776E+01 23274 3 50 1.061E+02 8.730E+01 23274 3 51 1.098E+02 6.207E+01 23274 3 52 1.114E+02 5.471E+01 23274 3 53 1.157E+02 5.337E+01 23274 3 54 1.209E+02 5.077E+01 23274 3 55 1.257E+02 5.412E+01 23274 3 56 1.284E+02 3.657E+01 23274 3 57 1.288E+02 5.147E+01 23274 3 58 1.325E+02 4.895E+01 23274 3 59 ENDDATA 50 0 23274 3 60 ENDSUBENT 59 0 23274 399999 ENDENTRY 3 0 2327499999999