ENTRY O1708 20221216 O170800000001 SUBENT O1708001 20221216 20230412 O170800100001 BIB 10 45 O170800100002 TITLE Proton-induced fission on actinide nuclei at energies O170800100003 27 and 63 MeV. O170800100004 AUTHOR (S.Isaev, R.Prieels, Th.Keutgen, J.van Mol, Y.El Masri,O170800100005 P.Demetriou) O170800100006 REFERENCE (J,NP/A,809,1,2008) O170800100007 (C,2007CORSEN,,55,2007) data only on figs. O170800100008 INSTITUTE (2BLGLVN,2GRCATH) O170800100009 FACILITY (CYCLO,2BLGLVN) Louvain-La-Neuve (LLN) Cyclotron O170800100010 facility CYCLONE O170800100011 METHOD (TOF) O170800100012 (COINC) neutron and fission fragments in coincidence O170800100013 DETECTOR (SPEC) Three different types of detectors were used- O170800100014 Two microchannel Si-diode detector, two large positionO170800100015 sensitive Multi-Wire Proportional gas Counters(MWPC), O170800100016 69 liquid-scintillator cells allowed the determinationO170800100017 of the neutron energy and angular distributions O170800100018 associated with the fission process(DEMON O170800100019 multidetector).Each DEMON counter, consisting of an O170800100020 active volume of 16 cm diameter by 20 cm depth, is O170800100021 filled with NE213 liquid-type scintillator. O170800100022 (SI) In order to monitor the reaction chamber residual O170800100023 activity(contamination from the target sputtering O170800100024 under the beam impact), up to three thin Si detectorsO170800100025 shielded from the target by thick aluminum blocks, O170800100026 allow the detection of the 5 MeV alpha-type particlesO170800100027 emitted by the eventual actinide material O170800100028 contamination in the reaction chamber wall. O170800100029 (MWPC) for fission fragments O170800100030 (SCIN) Neutrons were detected with the multidetector O170800100031 DEMON. O170800100032 SAMPLE The targets were sealed between two C-12 layers, thick O170800100033 enough(50 mug/cm**2) to stop either the recoiling O170800100034 target nucleus or the evaporation heavy residues of theO170800100035 reactions but not the fission fragments. The targets O170800100036 themselves had the following thickness-Th-232 145 mug/ O170800100037 cm**2, Np-237 159 mug/cm**2, U-238 180 mug/cm**2, O170800100038 Pu-239 106 mug/cm**2, Am-241 124 mug/cm**2. O170800100039 ERR-ANALYS (ERR-1) The uncertainty in the target thickness. O170800100040 (main source of systematic uncertainties) O170800100041 HISTORY (20090109C) SB O170800100042 (20120614U) SD: a few keywords DETECTOR O170800100043 moved to right position O170800100044 (20180630U) SD: Ref. 2007CORSEN,,55 added. Small O170800100045 corrections in all Subents. STATUS moved to Subents. O170800100046 (20221216A) SD: Corrections in Subents 007-011. O170800100047 ENDBIB 45 0 O170800100048 COMMON 1 3 O170800100049 ERR-1 O170800100050 PER-CENT O170800100051 5. O170800100052 ENDCOMMON 3 0 O170800100053 ENDSUBENT 52 0 O170800199999 SUBENT O1708002 20180630 O066O170800200001 BIB 4 4 O170800200002 REACTION (90-TH-232(P,F),,SIG) O170800200003 ERR-ANALYS (ERR-T) total uncertainty O170800200004 STATUS (TABLE) Tbl. 1 from Nucl.Phys.A809,p.1(2008) O170800200005 HISTORY (20180630U) SD: ERR-ANALYS was updated.DATA-ERR->ERR-T.O170800200006 ENDBIB 4 0 O170800200007 NOCOMMON 0 0 O170800200008 DATA 3 2 O170800200009 EN DATA ERR-T O170800200010 MEV MB MB O170800200011 26.5 1190. 60. O170800200012 62.9 1550. 78. O170800200013 ENDDATA 4 0 O170800200014 ENDSUBENT 13 0 O170800299999 SUBENT O1708003 20180630 O066O170800300001 BIB 4 4 O170800300002 REACTION (92-U-238(P,F),,SIG) O170800300003 ERR-ANALYS (ERR-T) total uncertainty O170800300004 STATUS (TABLE) Tbl. 1 from Nucl.Phys.A809,p.1(2008) O170800300005 HISTORY (20180630U) SD: ERR-ANALYS was updated.DATA-ERR->ERR-T.O170800300006 ENDBIB 4 0 O170800300007 NOCOMMON 0 0 O170800300008 DATA 3 2 O170800300009 EN DATA ERR-T O170800300010 MEV MB MB O170800300011 26.5 1540. 77. O170800300012 62.9 1980. 99. O170800300013 ENDDATA 4 0 O170800300014 ENDSUBENT 13 0 O170800399999 SUBENT O1708004 20180630 O066O170800400001 BIB 4 9 O170800400002 REACTION (93-NP-237(P,F),,SIG) O170800400003 ERR-ANALYS (ERR-T) total uncertainty. O170800400004 The uncertainty is reported by authors in O170800400005 table-the experimental uncertainties for the Np-237 O170800400006 cross sections were doubled with respect to the O170800400007 statistical errors in order to account for the target O170800400008 inhomogeneity. O170800400009 STATUS (TABLE) Tbl. 1 from Nucl.Phys.A809,p.1(2008) O170800400010 HISTORY (20180630U) SD: ERR-ANALYS was updated.DATA-ERR->ERR-T.O170800400011 ENDBIB 9 0 O170800400012 NOCOMMON 0 0 O170800400013 DATA 3 2 O170800400014 EN DATA ERR-T O170800400015 MEV MB MB O170800400016 26.5 1170. 118. O170800400017 62.9 1830. 184. O170800400018 ENDDATA 4 0 O170800400019 ENDSUBENT 18 0 O170800499999 SUBENT O1708005 20180630 O066O170800500001 BIB 4 4 O170800500002 REACTION (94-PU-239(P,F),,SIG) O170800500003 ERR-ANALYS (ERR-T) total uncertainty O170800500004 STATUS (TABLE) Tbl. 1 from Nucl.Phys.A809,p.1(2008) O170800500005 HISTORY (20180630U) SD: ERR-ANALYS was updated.DATA-ERR->ERR-T.O170800500006 ENDBIB 4 0 O170800500007 NOCOMMON 0 0 O170800500008 DATA 3 2 O170800500009 EN DATA ERR-T O170800500010 MEV MB MB O170800500011 26.5 1760. 88. O170800500012 62.9 2320. 116. O170800500013 ENDDATA 4 0 O170800500014 ENDSUBENT 13 0 O170800599999 SUBENT O1708006 20180630 O066O170800600001 BIB 4 4 O170800600002 REACTION (95-AM-241(P,F),,SIG) O170800600003 ERR-ANALYS (ERR-T) total uncertainty O170800600004 STATUS (TABLE) Tbl. 1 from Nucl.Phys.A809,p.1(2008) O170800600005 HISTORY (20180630U) SD: ERR-ANALYS was updated.DATA-ERR->ERR-T.O170800600006 ENDBIB 4 0 O170800600007 NOCOMMON 0 0 O170800600008 DATA 3 2 O170800600009 EN DATA ERR-T O170800600010 MEV MB MB O170800600011 26.5 1650. 83. O170800600012 62.9 2150. 108. O170800600013 ENDDATA 4 0 O170800600014 ENDSUBENT 13 0 O170800699999 SUBENT O1708007 20221216 20230412 O170800700001 BIB 6 31 O170800700002 REACTION 1(90-TH-232(P,F),PRE,KE,LF+HF) O170800700003 2(90-TH-232(P,F),,NU,,MSC) pre-scission neutron O170800700004 multiplicity O170800700005 3(90-TH-232(P,F),,NU,,MSC) compound nucleus neutron O170800700006 multiplicity. O170800700007 4(90-TH-232(P,F),,NU,,MSC) post-scission neutron O170800700008 multiplicity. O170800700009 ANALYSIS The relative contributions of pre-equilibrium neutron O170800700010 emission and compound nucleus evaporation, as well as O170800700011 of post-scission evaporation from the fission fragmentsO170800700012 were analyzed with moving multisource fits- O170800700013 -the emission spectra of neutron from a compound O170800700014 nuclei are described by a Maxwellian type distribution.O170800700015 -the spectra for neutron emitted from the FFs are O170800700016 described by the Watt distribution. O170800700017 -the PE source is not thermally equilibrated, the O170800700018 surface source form used to fit the corresponding O170800700019 curves and the fitting parameter are non-physical and O170800700020 hence inadequate to describe PE neutron emission. O170800700021 Due to the very weak PE contributions, the preceding O170800700022 observation will not significantly affect the results O170800700023 of the other source contribution. O170800700024 CORRECTION Corrected for neutron emissions based on the measured O170800700025 neutron angular and multiplicity distributions O170800700026 measured by the DEMON scintillator O170800700027 ERR-ANALYS (DATA-ERR) uncertainties derived from the moving O170800700028 multisource fits for symmetric (sym) mass partitions O170800700029 STATUS (TABLE) Tbl. 2 from Nucl.Phys.A809,p.1(2008) O170800700030 HISTORY (20180630U) SD: ERR-ANALYS was updated. O170800700031 (20221216A) SD: SF5=PRE; SF6=AKE -> KE; SF7=FF -> LF+HFO170800700032 in REACTION (1). Col.DATA -> DATA-ERR for REACTION (2).O170800700033 ENDBIB 31 0 O170800700034 NOCOMMON 0 0 O170800700035 DATA 9 2 O170800700036 EN DATA 1DATA-ERR 1DATA 2DATA-ERR 2DATA 3O170800700037 DATA-ERR 3DATA 4DATA-ERR 4 O170800700038 MEV MEV MEV PRT/FIS PRT/FIS PRT/FIS O170800700039 PRT/FIS PRT/FIS PRT/FIS O170800700040 26.5 166.3 25.8 0.94 O170800700041 0.53 1.48 0.39 O170800700042 62.9 173.6 21.8 0.18 0.05 3.47 O170800700043 0.35 1.52 0.32 O170800700044 ENDDATA 8 0 O170800700045 ENDSUBENT 44 0 O170800799999 SUBENT O1708008 20221216 20230412 O170800800001 BIB 6 30 O170800800002 REACTION 1(92-U-238(P,F),PRE,KE,LF+HF) O170800800003 2(92-U-238(P,F),,NU,,MSC) pre-scission multiplicity O170800800004 3(92-U-238(P,F),,NU,,MSC) compound nucleus neutron O170800800005 multiplicity. O170800800006 4(92-U-238(P,F),,NU,,MSC) post-scission neutron O170800800007 multiplicity. O170800800008 ANALYSIS The relative contributions of pre-equilibrium neutron O170800800009 emission and compound nucleus evaporation, as well as O170800800010 of post-scission evaporation from the fission fragmentsO170800800011 were analyzed with moving multisource fits- O170800800012 -the emission spectra of neutron from a compound O170800800013 nuclei are described by a Maxwellian type distribution.O170800800014 -the spectra for neutron emitted from the FFs are O170800800015 described by the Watt distribution. O170800800016 -the PE source is not thermally equilibrated, the O170800800017 surface source form used to fit the corresponding O170800800018 curves and the fitting parameter are non-physical and O170800800019 hence inadequate to describe PE neutron emission. O170800800020 Due to the very weak PE contributions, the preceding O170800800021 observation will not significantly affect the results O170800800022 of the other source contribution. O170800800023 CORRECTION Corrected for neutron emissions based on the measured O170800800024 neutron angular and multiplicity distributions O170800800025 measured by the DEMON scintillator O170800800026 ERR-ANALYS (DATA-ERR) uncertainties derived from the moving O170800800027 multisource fits for symmetric (sym) mass partitions O170800800028 STATUS (TABLE) Tbl. 2 from Nucl.Phys.A809,p.1(2008) O170800800029 HISTORY (20180630U) SD: ERR-ANALYS was updated. O170800800030 (20221216A) SD: SF5=PRE; SF6=AKE -> KE; SF7=FF -> LF+HFO170800800031 in REACTION (1). Col.DATA -> DATA-ERR for REACTION (2).O170800800032 ENDBIB 30 0 O170800800033 NOCOMMON 0 0 O170800800034 DATA 9 2 O170800800035 EN DATA 1DATA-ERR 1DATA 2DATA-ERR 2DATA 3O170800800036 DATA-ERR 3DATA 4DATA-ERR 4 O170800800037 MEV MEV MEV PRT/FIS PRT/FIS PRT/FIS O170800800038 PRT/FIS PRT/FIS PRT/FIS O170800800039 26.5 167.6 27.8 1.49 O170800800040 0.70 1.63 0.36 O170800800041 62.9 172.3 24.1 0.14 0.07 3.01 O170800800042 0.26 1.66 0.17 O170800800043 ENDDATA 8 0 O170800800044 ENDSUBENT 43 0 O170800899999 SUBENT O1708009 20221216 20230412 O170800900001 BIB 6 30 O170800900002 REACTION 1(93-NP-237(P,F),PRE,KE,LF+HF) O170800900003 2(93-NP-237(P,F),,NU,,MSC) pre-scission multiplicity O170800900004 3(93-NP-237(P,F),,NU,,MSC) compound nucleus neutron O170800900005 multiplicity. O170800900006 4(93-NP-237(P,F),,NU,,MSC) post-scission neutron O170800900007 multiplicity. O170800900008 ANALYSIS The relative contributions of pre-equilibrium neutron O170800900009 emission and compound nucleus evaporation, as well as O170800900010 of post-scission evaporation from the fission fragmentsO170800900011 were analyzed with moving multisource fits- O170800900012 -the emission spectra of neutron from a compound O170800900013 nuclei are described by a Maxwellian type distribution.O170800900014 -the spectra for neutron emitted from the FFs are O170800900015 described by the Watt distribution. O170800900016 -the PE source is not thermally equilibrated, the O170800900017 surface source form used to fit the corresponding O170800900018 curves and the fitting parameter are non-physical and O170800900019 hence inadequate to describe PE neutron emission. O170800900020 Due to the very weak PE contributions, the preceding O170800900021 observation will not significantly affect the results O170800900022 of the other source contribution. O170800900023 CORRECTION Corrected for neutron emissions based on the measured O170800900024 neutron angular and multiplicity distributions O170800900025 measured by the DEMON scintillator O170800900026 ERR-ANALYS (DATA-ERR) uncertainties derived from the moving O170800900027 multisource fits for symmetric (sym) mass partitions O170800900028 STATUS (TABLE) Tbl. 2 from Nucl.Phys.A809,p.1(2008) O170800900029 HISTORY (20180630U) SD: ERR-ANALYS was updated. O170800900030 (20221216A) SD: SF5=PRE; SF6=AKE -> KE; SF7=FF -> LF+HFO170800900031 in REACTION (1). Col.DATA -> DATA-ERR for REACTION (2).O170800900032 ENDBIB 30 0 O170800900033 NOCOMMON 0 0 O170800900034 DATA 9 2 O170800900035 EN DATA 1DATA-ERR 1DATA 2DATA-ERR 2DATA 3O170800900036 DATA-ERR 3DATA 4DATA-ERR 4 O170800900037 MEV MEV MEV PRT/FIS PRT/FIS PRT/FIS O170800900038 PRT/FIS PRT/FIS PRT/FIS O170800900039 26.5 178.8 32.5 0.85 O170800900040 0.51 1.85 0.29 O170800900041 62.9 179.1 29.3 0.15 0.07 2.64 O170800900042 0.58 1.79 0.44 O170800900043 ENDDATA 8 0 O170800900044 ENDSUBENT 43 0 O170800999999 SUBENT O1708010 20221216 20230412 O170801000001 BIB 6 30 O170801000002 REACTION 1(94-PU-239(P,F),PRE,KE,LF+HF) O170801000003 2(94-PU-239(P,F),,NU,,MSC) pre-scission multiplicity O170801000004 3(94-PU-239(P,F),,NU,,MSC) compound nucleus neutron O170801000005 multiplicity. O170801000006 4(94-PU-239(P,F),,NU,,MSC) post-scission neutron O170801000007 multiplicity. O170801000008 ANALYSIS The relative contributions of pre-equilibrium neutron O170801000009 emission and compound nucleus evaporation, as well as O170801000010 of post-scission evaporation from the fission fragmentsO170801000011 were analyzed with moving multisource fits- O170801000012 -the emission spectra of neutron from a compound O170801000013 nuclei are described by a Maxwellian type distribution.O170801000014 -the spectra for neutron emitted from the FFs are O170801000015 described by the Watt distribution. O170801000016 -the PE source is not thermally equilibrated, the O170801000017 surface source form used to fit the corresponding O170801000018 curves and the fitting parameter are non-physical and O170801000019 hence inadequate to describe PE neutron emission. O170801000020 Due to the very weak PE contributions, the preceding O170801000021 observation will not significantly affect the results O170801000022 of the other source contribution. O170801000023 CORRECTION Corrected for neutron emissions based on the measured O170801000024 neutron angular and multiplicity distributions O170801000025 measured by the DEMON scintillator O170801000026 ERR-ANALYS (DATA-ERR) uncertainties derived from the moving O170801000027 multisource fits for symmetric (sym) mass partitions O170801000028 STATUS (TABLE) Tbl. 2 from Nucl.Phys.A809,p.1(2008) O170801000029 HISTORY (20180630U) SD: ERR-ANALYS was updated. O170801000030 (20221216A) SD: SF5=PRE; SF6=AKE -> KE; SF7=FF -> LF+HFO170801000031 in REACTION (1). Col.DATA -> DATA-ERR for REACTION (2).O170801000032 ENDBIB 30 0 O170801000033 NOCOMMON 0 0 O170801000034 DATA 9 2 O170801000035 EN DATA 1DATA-ERR 1DATA 2DATA-ERR 2DATA 3O170801000036 DATA-ERR 3DATA 4DATA-ERR 4 O170801000037 MEV MEV MEV PRT/FIS PRT/FIS PRT/FIS O170801000038 PRT/FIS PRT/FIS PRT/FIS O170801000039 26.5 171.2 20.1 1.16 O170801000040 0.59 2.06 0.15 O170801000041 62.9 175.0 21.2 0.16 0.09 2.51 O170801000042 0.09 2.07 0.41 O170801000043 ENDDATA 8 0 O170801000044 ENDSUBENT 43 0 O170801099999 SUBENT O1708011 20221216 20230412 O170801100001 BIB 6 30 O170801100002 REACTION 1(95-AM-241(P,F),PRE,KE,LF+HF) O170801100003 2(95-AM-241(P,F),,NU,,MSC) pre-scission multiplicity O170801100004 3(95-AM-241(P,F),,NU,,MSC) compound nucleus neutron O170801100005 multiplicity. O170801100006 4(95-AM-241(P,F),,NU,,MSC) post-scission neutron O170801100007 multiplicity. O170801100008 ANALYSIS The relative contributions of pre-equilibrium neutron O170801100009 emission and compound nucleus evaporation, as well as O170801100010 of post-scission evaporation from the fission fragmentsO170801100011 were analyzed with moving multisource fits- O170801100012 -the emission spectra of neutron from a compound O170801100013 nuclei are described by a Maxwellian type distribution.O170801100014 -the spectra for neutron emitted from the FFs are O170801100015 described by the Watt distribution. O170801100016 -the PE source is not thermally equilibrated, the O170801100017 surface source form used to fit the corresponding O170801100018 curves and the fitting parameter are non-physical and O170801100019 hence inadequate to describe PE neutron emission. O170801100020 Due to the very weak PE contributions, the preceding O170801100021 observation will not significantly affect the results O170801100022 of the other source contribution. O170801100023 CORRECTION Corrected for neutron emissions based on the measured O170801100024 neutron angular and multiplicity distributions O170801100025 measured by the DEMON scintillator O170801100026 ERR-ANALYS (DATA-ERR) uncertainties derived from the moving O170801100027 multisource fits for symmetric (sym) mass partitions O170801100028 STATUS (TABLE) Tbl. 2 from Nucl.Phys.A809,p.1(2008) O170801100029 HISTORY (20180630U) SD: ERR-ANALYS was updated. O170801100030 (20221216A) SD: SF5=PRE; SF6=AKE -> KE; SF7=FF -> LF+HFO170801100031 in REACTION (1). Col.DATA -> DATA-ERR for REACTION (2).O170801100032 ENDBIB 30 0 O170801100033 NOCOMMON 0 0 O170801100034 DATA 9 2 O170801100035 EN DATA 1DATA-ERR 1DATA 2DATA-ERR 2DATA 3O170801100036 DATA-ERR 3DATA 4DATA-ERR 4 O170801100037 MEV MEV MEV PRT/FIS PRT/FIS PRT/FIS O170801100038 PRT/FIS PRT/FIS PRT/FIS O170801100039 26.5 179.1 29.3 1.03 O170801100040 0.24 2.09 0.10 O170801100041 62.9 186.4 25.5 0.16 0.06 2.53 O170801100042 0.03 2.09 0.15 O170801100043 ENDDATA 8 0 O170801100044 ENDSUBENT 43 0 O170801199999 ENDENTRY 6 0 O170899999999