LIGHT-PARTICLE EMISSION AND HEAVY-RESIDUE FORMATION IN THE FUSION-LIKE REACTIONS AR-40+CA-40 AT 15 MEV/U AND SI-28+SI-28 AT 20 MEV/U

被引：8

作者：

OBERSTEDT, A

VONNEUMANNCOSEL, P

RICHTER, A

ROSCH, W

SCHRIEDER, G

BELLM, D

GENTNER, R

KELLER, K

LASSEN, L

SEIBERT, U

HILSCHER, D

LEHMANN, M

机构：

[1] TH DARMSTADT,INST KERNPHYS,W-6100 DARMSTADT,GERMANY

[2] UNIV HEIDELBERG,INST PHYS,W-6900 HEIDELBERG,GERMANY

[3] HAHN MEITNER INST KERNFORSCH BERLIN GMBH,W-1000 BERLIN,GERMANY

来源：

NUCLEAR PHYSICS A | 1992年 / 548卷 / 03期

关键词：

AR-40(CA-40; X); E = 15 MEV/NUCLEON; SI-28(SI-28; E = 20 MEV/NUCLEON; MEASURED EVAPORATION RESIDUE SIGMA(A; Z; MULTIPLICITY; THETA); LIGHT PARTICLE SIGMA(E; DEDUCED LIGHT-PARTICLE EQUILIBRIUM; PREEQUILIBRIUM MULTIPLICITIES; DISCUSSED MASS BALANCE; RESIDUE FORMATION; QUANTAL PHASE SPACE MODEL;

D O I：

10.1016/0375-9474(92)90699-K

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：

Heavy reaction products coincident with neutrons and light charged particles were studied in central collisions in the mass-symmetric systems Ar-40 + Ca-40 and Si-28 + Si-28 at incident energies of 15 respectively 20 MeV/u. The results demonstrate quantitatively an interrelation between heavy-residue mass and element distributions and light-particle multiplicities: the mass difference between the observed fragments and the compound nuclei can be explained entirely by the emission of light particles with Z less-than-or-equal-to 2. All neutron data are very well reproduced within the framework of a quantal phase-space model, stressing the importance of two-body collisions in the reaction dynamics already at these energies. Trends in the deduced neutron multiplicities and nuclear temperatures indicate evidence for a limiting excitation energy for residue formation.

引用

页码：525 / 540

页数：16