ENTRY 23777 20220206 23082377700000001 SUBENT 23777001 20220206 23082377700100001 BIB 14 50 2377700100002 TITLE 239Pu(n,2n)238Pu cross section measurement using a 2377700100003 recoil method 2377700100004 AUTHOR (V.Meot, O.Roig, B.Laurent, P.Morel, J.Aupiais, 2377700100005 O.Delaune, G.Haouat, O.Bouland) 2377700100006 INSTITUTE (2FR BRC,2FR PAR,2FR CAD) 2377700100007 REFERENCE (J,PR/C,103,054609,2021) 2377700100008 #doi:10.1103/PhysRevC.103.054609 2377700100009 FACILITY (VDGT,2FR CAD) 2377700100010 INC-SOURCE (D-D) A deuterium gaseous target was used. 2377700100011 METHOD (REC) A carbon catcher situated in direct view of the 2377700100012 239PuO2 deposit was used to collect the 238Pu recoiling2377700100013 nuclei. The collection efficiency was determined by 2377700100014 238U(n,2n)237U reaction measurements. 2377700100015 (ASPEC) For the 238Pu activity measurement. 2377700100016 (ACTIV) Parameters of irradiation and measurements: 2377700100017 Ed En Irradiation Measurement 2377700100018 (MeV) (MeV) (h) (days) 2377700100019 4.47 7.1 332.30 303 2377700100020 5.08 7.7 176 186 2377700100021 (GSPEC) For 24Na activity measurement. 2377700100022 SAMPLE (94-PU-239,ENR=0.97941) Pu(NO3)4 solution, enriched at 2377700100023 97.94% in 239Pu. The number of isotopes present in 2377700100024 the deposits relative to 239Pu: 2377700100025 238Pu/239Pu = (1.96 +- 0.03)E-5 2377700100026 240Pu/239Pu = (2.15 +- 0.02)E-2 and 2377700100027 241Am/239Pu =( 4.95 +- 0.03)E-6. 2377700100028 The sample consists of compact stack of 10 deposits of 2377700100029 4 ug/cm2 239Pu on 200 ug/cm2 titanium backing and 2377700100030 48 mg/cm2 carbon collector each. 2377700100031 DETECTOR (IMPSI) A450 PIPS detector with a surface area of 2377700100032 450mm2 for alpha counting. The efficiencies at 7.1 MeV 2377700100033 and 7.7 MeV have been assigned under the assumption 2377700100034 that the collection efficiency does not vary between 2377700100035 9.3 and 7 MeV, which was confirmed by the 2377700100036 238U(n,2n)237U measurement. 2377700100037 (HPGE) 2377700100038 MONITOR (94-PU-239(N,2N)94-PU-238,,SIG) 2377700100039 MONIT-REF (13787006,J.A.Becker+,J,NSTS,2,620,2002) 2377700100040 DECAY-DATA (94-PU-238,87.7YR,A,5442.8,0.131, 2377700100041 A,5499.03,0.7091) 2377700100042 ERR-ANALYS (ERR-T) The total uncertainties account for: 2377700100043 (ERR-S) counting statistics 2377700100044 (ERR-SYS) the systematics errors composed of: 2377700100045 - the uncertainties of McNabb et al., Evaluation 2377700100046 of the 239Pu(n,2n) integrated cross section, Lawrence 2377700100047 Livermore National Laboratory Report No. UCRL-ID-1433282377700100048 2001 propagated to lower-energy data points; 2377700100049 - the collection efficiency uncertainty; 2377700100050 - the uncertainties of the neutron standard monitors. 2377700100051 HISTORY (20220206C) VS. 2377700100052 ENDBIB 50 0 2377700100053 COMMON 3 3 2377700100054 EN-NRM MONIT MONIT-ERR 2377700100055 MEV MB MB 2377700100056 9.52 274. 15. 2377700100057 ENDCOMMON 3 0 2377700100058 ENDSUBENT 57 0 2377700199999 SUBENT 23777002 20220206 23082377700200001 BIB 2 2 2377700200002 REACTION (94-PU-239(N,2N)94-PU-238,,SIG) 2377700200003 STATUS (TABLE) Table VI of Phys.Rev.C103(2021)054609 2377700200004 ENDBIB 2 0 2377700200005 NOCOMMON 0 0 2377700200006 DATA 5 3 2377700200007 EN DATA ERR-T ERR-S ERR-SYS 2377700200008 MEV MB MB MB MB 2377700200009 7.10 142.0 23.3 7.7 22.0 2377700200010 7.72 207.3 34.0 10.4 32.4 2377700200011 9.34 269.0 40.3 40.3 2377700200012 ENDDATA 5 0 2377700200013 ENDSUBENT 12 0 2377700299999 ENDENTRY 2 0 2377799999999