ENTRY A0648 20180615 A090A064800000001 SUBENT A0648001 20180615 A090A064800100001 BIB 10 23 A064800100002 TITLE Isomeric ratios for Cs-134-m,g and Cs-135-m,g produced A064800100003 by (p,3pxn) reactions on 139-La from 40 to 150 MeV. A064800100004 AUTHOR (J.-C.Krupa) A064800100005 INSTITUTE (2FR PAR) A064800100006 REFERENCE (J,JIN,38,965,1976) A064800100007 SAMPLE Metallic foils of lanthanum (15 x 8 x 0 25 mm) were A064800100008 bombarded in the internal beam of THC Orsay A064800100009 synchrocyclotron. A064800100010 DETECTOR (NAICR) A064800100011 FACILITY (SYNCY,2FR PAR) A064800100012 (SPECM,2FR PAR) A064800100013 METHOD (ACTIV) A064800100014 (INTB) A064800100015 ADD-RES (COMP).Statistical model. Huizenga-Vandenbosch A064800100016 formalism was used. A064800100017 HISTORY (19990807C) by CAJaD. A064800100018 (20000503A) Otto Schwerer remarks are included A064800100019 (20000717A) Date is corrected A064800100020 (20080616A) BIB section updated A064800100021 Corrections were made according new EXFOR rules and A064800100022 N.Otsuka remarks. A064800100023 (20180615A) SD: Small corrections in all Subents. A064800100024 ERR-ANALYS was updated.REACTION code corrected in Sub.2A064800100025 ENDBIB 23 0 A064800100026 NOCOMMON 0 0 A064800100027 ENDSUBENT 26 0 A064800199999 SUBENT A0648002 20180615 A090A064800200001 BIB 7 38 A064800200002 REACTION (57-LA-139(P,X)55-CS-134-M/T,,SIG/RAT) A064800200003 Cs-134 is shielded nuclide. A064800200004 METHOD (ASEP).The cesium isotopes produced in small quantitiesA064800200005 in the irradiated targets were separated directly A064800200006 inside a surface ionization ion source of an A064800200007 electromagnetic isotope separator. In the apparatus A064800200008 chemical separation was based upon the differences of A064800200009 volatility and ionization potentials of the elements. A064800200010 a first chemical separation took place in the oven A064800200011 because of the volatility of these elements. A second A064800200012 drastic separation occurred along the heated tantalum A064800200013 pipe where only the alkali atoms were ionized. A064800200014 an electric field accelerates these ions which are thenA064800200015 electromagnetically mass separated. The tantalum was A064800200016 selected as the ionizing surface because it is easily A064800200017 machined though the electron work function (W = 4.19A064800200018 eV) is not very large; nevertheless it is large enoughA064800200019 to ionize cesium atoms which present a low ionization A064800200020 potential (W= 3.89 eV) A064800200021 (GSPEC) for the 134-Cs isomeric pair (T1/2(m) = 2.9Hr),A064800200022 (T1/2(g) = 2.1 Yr), the population of the two states A064800200023 were determined directly by measuring the gamma A064800200024 activity of 134-Cs, mass separated and collected on 5A064800200025 mum-thin aluminum foil. In this case, the irradiated A064800200026 targets were immediately introduced in the graphite A064800200027 crucible of the ion source and were progressively A064800200028 brought to the melting temperature in order to A064800200029 facilitate the diffusion of the alkali element. A064800200030 ANALYSIS (DECAY) A064800200031 DECAY-DATA (55-CS-134-M,2.9HR) A064800200032 (55-CS-134-G,2.1YR) A064800200033 ERR-ANALYS (ERR-S) Random error from error bars. The errors are A064800200034 essentially attributable to the low gamma activity A064800200035 measurement on the ground state and the counting A064800200036 efficiency of the gamma-ray detector. A064800200037 STATUS (CURVE) fig.3 from JIN,38,965,1976 A064800200038 HISTORY (20180615A) SF3=3N+3P -> X in REACTION code. A064800200039 STATUS added. DATA-ERR -> ERR-S. A064800200040 ENDBIB 38 0 A064800200041 COMMON 1 3 A064800200042 EN-ERR-DIG A064800200043 MEV A064800200044 0.7 A064800200045 ENDCOMMON 3 0 A064800200046 DATA 3 9 A064800200047 EN DATA ERR-S A064800200048 MEV NO-DIM NO-DIM A064800200049 47.9 0.239 1.8E-02 A064800200050 58. 0.301 1.1E-02 A064800200051 68.1 0.372 7.E-03 A064800200052 77.8 0.401 8.E-03 A064800200053 89.2 0.409 8.E-03 A064800200054 99.1 0.414 6.E-03 A064800200055 119.3 0.417 8.E-03 A064800200056 140.1 0.416 7.E-03 A064800200057 149.5 0.411 8.E-03 A064800200058 ENDDATA 11 0 A064800200059 ENDSUBENT 58 0 A064800299999 SUBENT A0648003 20180615 A090A064800300001 BIB 6 35 A064800300002 REACTION (57-LA-139(P,X)55-CS-135-M/T,CUM,SIG/RAT) A064800300003 METHOD (ASEP) the cesium isotopes produced in small quantitiesA064800300004 in the irradiated targets were separated directly A064800300005 inside a surface ionization ion source of an A064800300006 electromagnetic isotope separator, or a mass A064800300007 spectrometer according to the half-life of the isotopesA064800300008 under consideration. In both apparatus chemical A064800300009 separation was based upon the differences of volalilityA064800300010 and ionization potentials of the elements. A064800300011 (GSPEC) for the 135-Cs isomeric pair only the A064800300012 population of the metastable state (T1/2=55min) can beA064800300013 determined with this method (isotopic separation, A064800300014 collection and gamma-spectroscopy). Indeed, the very A064800300015 long half-life of the ground state (T1/2=2x10**6 yr) A064800300016 prevents any activity measurement. So we used a mass A064800300017 spectrometry technique to measure the total cross A064800300018 section for production of 135-Cs. In these two A064800300019 determinations, the 132-Cs, also produced in the A064800300020 target, was used as an internal monitor and permitted A064800300021 the determination of the ratio 135-m-Cs/132-Cs with theA064800300022 separator and 135-m+g-Cs/132-Cs with the mass A064800300023 spectrometer. A064800300024 DECAY-DATA (55-CS-135-M,55.MIN) A064800300025 (55-CS-135-G,2.E+6YR) A064800300026 ERR-ANALYS (ERR-S) Random error from error bars. For the A064800300027 Cs-135 isomeric ratio determination which need at A064800300028 same time gamma-counting and mass spectrometry A064800300029 techniques, the principal error arise from A064800300030 simultaneous collection of very pure Cs-135 and Cs-132 A064800300031 isotopes in the separator. Random error can A064800300032 affect the isomeric ratios by about +-20%. A064800300033 STATUS (CURVE) fig.4 from JIN,38,965,1976 A064800300034 HISTORY (20180615A) SF3=3N+3P -> X in REACTION code. STATUS A064800300035 added. COMMENT deleted (info moved to ERR-ANALYS). A064800300036 DATA-ERR -> ERR-S. A064800300037 ENDBIB 35 0 A064800300038 COMMON 1 3 A064800300039 EN-ERR-DIG A064800300040 MEV A064800300041 0.9 A064800300042 ENDCOMMON 3 0 A064800300043 DATA 3 9 A064800300044 EN DATA ERR-S A064800300045 MEV NO-DIM NO-DIM A064800300046 64.6 0.123 1.E-02 A064800300047 74.8 0.138 3.E-03 A064800300048 85. 0.167 9.E-03 A064800300049 95.9 0.178 7.E-03 A064800300050 105.5 0.193 9.E-03 A064800300051 117.1 0.19 1.E-02 A064800300052 125. 0.172 1.E-02 A064800300053 137.8 0.162 9.E-03 A064800300054 151.1 0.163 9.E-03 A064800300055 ENDDATA 11 0 A064800300056 ENDSUBENT 55 0 A064800399999 ENDENTRY 3 0 A064899999999