## Nuclear collisions from the mean-field into the fragmentation regimeAt first sight the topic dealt with in this book may seem very technical and specialized. However it aims at presenting one very fundamental aspect of modern nuclear physics. At low incident energies, the collision of two nuclei is governed by the rearrangement of individual nucleons within the average mean field created by all of them. At high energies, the wavelength of nucleons is so short that they essentially experience individual nucleon-nucleon collisions without much influence of collective nuclear effects. Very interesting and enlightening phenomena occur when the velocity of the colliding nuclei is of the same order of magnitude as the velocity of nucleons within the nuclei. Up until recently beams of nuclei accelerated to the Fermi energy and above were not available to allow for an efficient study of that transition regime. Within a few years spectacular progress has been made to clarify the main issues, formulate the operating concepts and put order in the growing body of experimental results. The contributions in this book present the current status of this new field. They go from the study of the thermodynamics of bound nuclear systems to some remarkable signatures of the collision process. Some new features of nuclear structure which are revealed in collisions at the Fermi energy are also presented. |

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Page 380

7 =Jjd<1d<2.|Jdr1-dr2.Z)(r1,<i;p1).Z)(r2,t2;p2). a a*. d3Pid3p2 \\n:^r[,r2)\^\\Tl;lSr[,

r2)\2 To predict the probability of observing two protons with the required

momenta, one needs

Koonin's ...

7 =Jjd<1d<2.|Jdr1-dr2.Z)(r1,<i;p1).Z)(r2,t2;p2). a a*. d3Pid3p2 \\n:^r[,r2)\^\\Tl;lSr[,

r2)\2 To predict the probability of observing two protons with the required

momenta, one needs

**wave functions**computed (for <2 > ) at 380 H. DOUBREKoonin's ...

Page 381

menta, one needs

2 - k ) and r2 , where V is the centre-of-mass velocity of the two-proton system: Pi

+P2 P V = 2m m Taking care of the case tx ><2 leads to a time integration over ...

menta, one needs

**wave functions**computed (for <2 > ) at positions r[ = rx + V • (<2 - k ) and r2 , where V is the centre-of-mass velocity of the two-proton system: Pi

+P2 P V = 2m m Taking care of the case tx ><2 leads to a time integration over ...

Page 464

For the case of nucleons the p-d mixing turns out to be more important, because

the mixing amplitudes depend on the overlap between the two

and the p- and d-

where ...

For the case of nucleons the p-d mixing turns out to be more important, because

the mixing amplitudes depend on the overlap between the two

**wave functions**,and the p- and d-

**wave functions**have larger overlap at the nuclear surface,where ...

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### Contents

INDICE | 1 |

Is it possible to deduce temperatures from gammaray or pion | 31 |

Guerreau Lightparticle emission as a probe of reaction mecha | 37 |

Copyright | |

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### Common terms and phrases

angle angular distributions angular momentum average beam bombarding energies break-up bremsstrahlung calculations central collisions channel cluster cm/ns correlation function corresponding Coulomb Coulomb barrier critical exponents cross-section curve decay degrader density dependence detected detector dipole discussed dissipation DWBA dynamics edited effects emission emitted energy loss equation ergy evaporation excitation energy experiment experimental Fermi fission fm/c fragments fusion GANIL hard-photon heavy-ion collisions high-energy impact parameter incident energy interaction isotopes kinetic energy kinetic-energy Lett light particles mass measured MeV/u momenta multifragmentation neutron multiplicity Nucl nuclear matter nuclei nucleon nucleon-nucleon collisions observed obtained pairing percolation phase space phase transition photon Phys pion prescission production projectile proton-neutron quantum reaction relative saddle point scattering shown in fig shows single-particle sion spectra spectrometer statistical target temperature thermal tion TKEL transfer two-centre velocity width yield