ENTRY 23274 20150222 22492327400000001 SUBENT 23274001 20150222 22492327400100001 BIB 11 28 2327400100002 TITLE First observation of beta-delayed two-neutron 2327400100003 radioactivity: 11Li . 2327400100004 AUTHOR (R.E.Azuma,L.C.Carraz,P.G.Hansen,B.Jonson,K.-L.Kratz, 2327400100005 S.Mattsson,G.Nyman,H.Ohm,H.L.Ravn,A.Schroeder, 2327400100006 W.Ziegert) 2327400100007 INSTITUTE (2ZZZCER) The ISOLDE Collaboration. 2327400100008 REFERENCE (J,PRL,43,1652,1979) 2327400100009 FACILITY (SYNCY,2ZZZCER) ISOLDE facility at CERN 2327400100010 synchrocyclotron . 2327400100011 DECAY-DATA (3-LI-11,8.5MSEC) 8.5+-0.2 msec 2327400100012 SAMPLE Li-11 was produced by bombarding a 12-g/cm2 uranium 2327400100013 carbide at 2000 degC with 1.6-microA 600-MeV protons. 2327400100014 Li atoms were mass separated . 2327400100015 DETECTOR (IOCH) Three He-3 ionization chambers operated in 2327400100016 parallel - to measure singles neutron spectrum. 2327400100017 ADD-RES Data obtained in additional experiments: 2327400100018 Fig.2 - distributions of time correlated n-n events in 2327400100019 Li-11 experiment and with a 1.9-kg U-238 sample 2327400100020 spon.fission; insert - Li-9 (175msec) showed no 2327400100021 correlated events. 2327400100022 Li-11 decay level scheme on Fig.1 right. 2327400100023 Li-11 decay has 9+-3 % two-neutron events and 43+-9 % 2327400100024 single-neutron events , assuming 61+-7 % for the total 2327400100025 neutron intensity from : 2327400100026 REL-REF (R,,E.Roeckl+,J,PR/C,10,1181,1974) 2327400100027 HISTORY (20160322C) M.M. 2327400100028 Digitized data were received from consultants of 2327400100029 beta-delayed neutron CRP . 2327400100030 ENDBIB 28 0 2327400100031 NOCOMMON 0 0 2327400100032 ENDSUBENT 31 0 2327400199999 SUBENT 23274002 20160322 22492327400200001 BIB 3 4 2327400200002 REACTION (3-LI-11(0,B-)4-BE-11,,PN/DE,,REL) 2327400200003 Relative beta-delayed neutrons spectrum, counts. 2327400200004 EN-SEC (E,N) Energy of delayed neutrons. 2327400200005 STATUS (CURVE) Fig.1 left of PR/L,43,1652,1979 2327400200006 ENDBIB 4 0 2327400200007 NOCOMMON 0 0 2327400200008 DATA 2 52 2327400200009 E DATA 2327400200010 MEV ARB-UNITS 2327400200011 -5.534E-02 1.444E+03 2327400200012 -1.479E-02 1.957E+04 2327400200013 3.146E-02 2.086E+03 2327400200014 8.403E-02 1.324E+03 2327400200015 1.162E-01 7.495E+02 2327400200016 1.679E-01 7.130E+02 2327400200017 2.196E-01 6.530E+02 2327400200018 2.714E-01 5.981E+02 2327400200019 3.125E-01 6.216E+02 2327400200020 3.384E-01 5.837E+02 2327400200021 3.953E-01 5.346E+02 2327400200022 4.419E-01 5.022E+02 2327400200023 4.832E-01 4.717E+02 2327400200024 5.352E-01 3.904E+02 2327400200025 5.868E-01 3.809E+02 2327400200026 6.232E-01 3.581E+02 2327400200027 6.698E-01 2.971E+02 2327400200028 7.242E-01 2.655E+02 2327400200029 7.744E-01 2.580E+02 2327400200030 8.127E-01 2.374E+02 2327400200031 8.570E-01 2.283E+02 2327400200032 9.051E-01 2.307E+02 2327400200033 9.473E-01 2.219E+02 2327400200034 1.002E+00 2.210E+02 2327400200035 1.043E+00 2.393E+02 2327400200036 1.074E+00 2.394E+02 2327400200037 1.132E+00 2.129E+02 2327400200038 1.184E+00 2.260E+02 2327400200039 1.224E+00 2.495E+02 2327400200040 1.264E+00 2.319E+02 2327400200041 1.315E+00 2.092E+02 2327400200042 1.363E+00 2.167E+02 2327400200043 1.409E+00 2.054E+02 2327400200044 1.445E+00 1.928E+02 2327400200045 1.492E+00 1.731E+02 2327400200046 1.538E+00 1.616E+02 2327400200047 1.578E+00 1.458E+02 2327400200048 1.629E+00 1.271E+02 2327400200049 1.673E+00 1.119E+02 2327400200050 1.723E+00 1.109E+02 2327400200051 1.764E+00 1.083E+02 2327400200052 1.802E+00 1.094E+02 2327400200053 1.855E+00 1.464E+02 2327400200054 1.894E+00 1.245E+02 2327400200055 1.946E+00 1.423E+02 2327400200056 1.992E+00 1.602E+02 2327400200057 2.042E+00 1.475E+02 2327400200058 2.083E+00 1.194E+02 2327400200059 2.129E+00 9.293E+01 2327400200060 2.172E+00 7.058E+01 2327400200061 2.212E+00 6.305E+01 2327400200062 2.267E+00 4.719E+01 2327400200063 ENDDATA 54 0 2327400200064 ENDSUBENT 63 0 2327400299999 SUBENT 23274003 20160322 22492327400300001 BIB 3 4 2327400300002 REACTION (3-LI-11(0,B-)4-BE-11,,PN/DE,,REL) 2327400300003 Relative beta-delayed neutrons spectrum, counts. 2327400300004 EN-SEC (E,N) Energy of delayed neutrons. 2327400300005 STATUS (CURVE) Fig.1 left, insert of PR/L,43,1652,1979 2327400300006 ENDBIB 4 0 2327400300007 NOCOMMON 0 0 2327400300008 DATA 2 48 2327400300009 E DATA 2327400300010 MEV ARB-UNITS 2327400300011 -1.779E+01 2.084E+02 2327400300012 -1.475E+01 3.502E+02 2327400300013 -1.174E+01 7.115E+02 2327400300014 -8.701E+00 1.196E+03 2327400300015 -6.687E+00 1.816E+03 2327400300016 -4.100E+00 2.224E+03 2327400300017 -4.266E-01 2.340E+03 2327400300018 2.745E+00 2.198E+03 2327400300019 7.019E+00 1.644E+03 2327400300020 9.692E+00 1.360E+03 2327400300021 1.392E+01 1.230E+03 2327400300022 1.500E+01 1.126E+03 2327400300023 1.924E+01 9.677E+02 2327400300024 2.298E+01 7.422E+02 2327400300025 2.567E+01 5.838E+02 2327400300026 2.786E+01 3.847E+02 2327400300027 3.112E+01 2.440E+02 2327400300028 3.440E+01 1.382E+02 2327400300029 3.861E+01 1.418E+02 2327400300030 4.025E+01 1.060E+02 2327400300031 4.394E+01 1.034E+02 2327400300032 4.607E+01 9.348E+01 2327400300033 5.027E+01 9.838E+01 2327400300034 5.344E+01 9.123E+01 2327400300035 5.654E+01 1.206E+02 2327400300036 5.921E+01 1.010E+02 2327400300037 6.288E+01 1.050E+02 2327400300038 6.653E+01 1.254E+02 2327400300039 7.024E+01 1.134E+02 2327400300040 7.125E+01 1.336E+02 2327400300041 7.597E+01 1.443E+02 2327400300042 7.760E+01 1.179E+02 2327400300043 8.130E+01 1.093E+02 2327400300044 8.499E+01 1.026E+02 2327400300045 8.974E+01 1.001E+02 2327400300046 9.395E+01 9.893E+01 2327400300047 9.771E+01 7.123E+01 2327400300048 9.821E+01 7.983E+01 2327400300049 1.035E+02 6.776E+01 2327400300050 1.061E+02 8.730E+01 2327400300051 1.098E+02 6.207E+01 2327400300052 1.114E+02 5.471E+01 2327400300053 1.157E+02 5.337E+01 2327400300054 1.209E+02 5.077E+01 2327400300055 1.257E+02 5.412E+01 2327400300056 1.284E+02 3.657E+01 2327400300057 1.288E+02 5.147E+01 2327400300058 1.325E+02 4.895E+01 2327400300059 ENDDATA 50 0 2327400300060 ENDSUBENT 59 0 2327400399999 ENDENTRY 3 0 2327499999999