ENTRY M0364 20120927 M064M036400000001 SUBENT M0364001 20120927 M064M036400100001 BIB 13 65 M036400100002 TITLE A study of the photoneutron contribution to the giant M036400100003 dipole resonance of nuclei in the A = 64 - 86 mass M036400100004 region. M036400100005 AUTHOR (P.Carlos,H.Beil,R.Bergere,J.Fagot,A.Lepretre, M036400100006 A.Veyssiere,G.V.Solodukhov) M036400100007 INSTITUTE (2FR SAC) M036400100008 REFERENCE (J,NP/A,258,365,1976) M036400100009 #doi:10.1016/0375-9474(76)90012-9 M036400100010 FACILITY (LINAC,2FR SAC) M036400100011 INC-SOURCE (QMPH) In-flight annihilation of monochromatic M036400100012 positrons M036400100013 DETECTOR (SCIN) 250 litre gadolinium-loaded liquid M036400100014 scintillator with neutron detection efficiency about M036400100015 40 - 60 percents. M036400100016 METHOD (EXTB) M036400100017 SAMPLE The sample specifications of the targets: M036400100018 Nucleus Mass Chemical Form Purity Princ.Impur. M036400100019 (G) (Percent) (Percent) M036400100020 Zn-64 70 Zno 90 Zn-66 7 M036400100021 Zn-68 2 M036400100022 Ge-70 50 Metal 94 Ge-72 2 M036400100023 Ge-74 2.5 M036400100024 Ge-72 50 Metal 98 Ge-74 1 M036400100025 Ge-74 50 Metal 98 M036400100026 Ge-76 50 Ge(O-2) 70 Ge-70 6.4 M036400100027 Ge-72 8.7 M036400100028 Ge-73 3.7 M036400100029 Ge-74 11.4 M036400100030 Se-76 50 Metal 90.5 Se-77 1.4 M036400100031 Se-78 2.7 M036400100032 Se-80 4.7 M036400100033 Se-78 50 Metal 98 Se-80 1.3 M036400100034 Se-80 50 Metal 99 M036400100035 Se-82 50 Metal 92.2 Se-78 1.8 M036400100036 Se-80 4.8 M036400100037 ANALYSIS The direct measurement of cross sections using the M036400100038 in-flight annihilation of monochromatic positrons M036400100039 photon monochromator of Saclay linac and high M036400100040 efficiency neutron detecting system which permits M036400100041 direct, separate and simultaneous measurements of M036400100042 the partial photoneutron cross sections for the M036400100043 reactions ((g,n) + (g,np)), (g,2n) etc., thus giving M036400100044 direct access to the total photoneutron reaction M036400100045 cross section ((g,n) + (g,np) + (g,2n) + ...). M036400100046 ERR-ANALYS Statistical errors are given. M036400100047 COMMENT The photoneutron cross sections for reactions ((g,n) M036400100048 + (g,np)) and (g,2n) of Zn-64, Ga, Ge-70,72,74,76, M036400100049 As-75, And Se-76,78,80,82 were measured with a M036400100050 monochromatic photon beam and a high efficiency M036400100051 neutron detecting system in the photon-energy range M036400100052 Eg = 8 - 30 MeV. Integrated cross sections are M036400100053 discussed. The evolution of the GDR as observed M036400100054 through the neutron exit channel only, is tentatively M036400100055 interpreted in terms of isospin splitting or in M036400100056 terms of the dynamic collective model. M036400100057 The energy resolution is defined by the full-width M036400100058 at half-maximum of the quasimonochromatic photon M036400100059 beam varies slowly from about 250 keV at Eg = 10 MeV M036400100060 to roughly 350 kev at Eg = 30 MeV. The following M036400100061 En-rsl-fw data were obtained by linear M036400100062 interpolation. M036400100063 HISTORY (19940223C) M036400100064 (20120927A) Corrected by V.Varlamov: dates, doi, M036400100065 lowercase. M036400100066 Entry deleted because of duplication with L0043. 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