A HIGH-RESOLUTION MULTI-PARAMETRIC STUDY OF PU-239(NTH,F) WITH THE COSI-FAN-TUTTE SPECTROMETER

被引:23
作者
BOUCHENEB, N
ASGHAR, M
BARREAU, G
DOAN, TP
LEROUX, B
SICRE, A
GELTENBORT, P
OED, A
机构
[1] CEN,BORDEAUX,FRANCE
[2] INST MAX VON LAUE PAUL LANGEVIN,F-38042 GRENOBLE,FRANCE
关键词
PU-239(N; F); E=THERMAL; MEASURED LIGHT FRAGMENT MASS CHARGE ENERGY CORRELATIONS; DEDUCED DIFFERENT MASS; CHARGE YIELDS; PROTON; NEUTRON YIELD ODD EVEN EFFECTS; THE ODD EVEN EFFECT ON ENERGY; THE CONDITIONAL CHARGE VARIANCE;
D O I
10.1016/0375-9474(91)90516-9
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
The Cosi-Fan-Tutte spectrometer has been used to measure for the first time in one go the mass-nuclear charge-energy correlations of well-resolved light group masses for Pu-239(n(th),f). About 2 x 10(6) events were collected and analysed. The global mass distribution is consistent with the Lohengrin data. The mean proton odd-even effects in yields and energy are delta-p = (11.8 +/- 0.3)% and delta-E(K)o-e = 0.49 +/- 0.15 MeV respectively. The delta-p(E(L)) varies from almost-equal-to 7% to almost-equal-to 25% for E(L) = 90 to 116 MeV. The present analysis consists of 21 values of E(L) compared to only 5 values for Lohengrin. The apparent mean neutron odd-even effect delta-n = (3.5 +/- 0.1)% is much lower than the delta-n = (6.5 +/- 0.7)% for Lohengrin. The mean value of conditional variance <sigma-Z2(Z\A)> = (0.42 +/- 0.02); the <sigma-Z2(Z\A)> increases from Th-230 to Cf-250 and this behaviour turns out to be important for understanding the dynamics of the fission process.
引用
收藏
页码:77 / 93
页数:17
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