https://escholarship.org/content/qt7r00v6bg/qt7r00v6bg.pdf

Transport of angular momentum in damped nuclear reactions

Gamma spectroscopic studies exploiting deep-inelastic heavy-ion reactions in thick target experiments are reviewed. The description of physical motivation, history of early experiments, analysis of the N/Z equilibration process as well as the outline of the experimental method and data analysis are followed by the presentation of main results obtained in various regions of the nuclide chart. Brief comments on thin target spectroscopy experiments involving fragment detection and future outlook are summarized.

http://iopscience.iop.org/article/10.1088/0954-3899/32/6/R01/pdf

Spectroscopic studies with the use of deep-inelastic heavy-ion reactions

Kinematically complete experiments have been performed on the two- and three-body exit channels in the reactions84Kr+166Er and129Xe+122Sn at 125 MeV/u Three-body events occur with an unusually high probability They arise from a fast two-step mechanism where a sequential fission-like process follows a deep inelastic collision with preferentially very large energy losses Strong Coulomb proximity effects are observed in the three-body final state which, treated quantitatively in Coulomb trajectory calculations, establish a time-scale of 1·10−21 s between the consecutive scission acts The angular distribution of fission fragments is consistent with an orientation of the fission axis approximately collinear with the axis of the first scission, and the mass distribution of the fission is asymmetric with the heavier mass emitted preferentially opposite to the direction of the third particle The high fission probability, the short time-scale, the near collinear orientation and the fission mass asymmetry together present consistent evidence for a new phenomenon of non-equilibrium fission

Observation of proximity- and non-equilibrium effects in ternary heavy ion reactions

Damped Nuclear Reactions

Equilibrium treatment of spin-depolarizing modes in mass asymmetric heavy-ion systems

https://digital.library.unt.edu/ark:/67531/metadc869653/m2/1/high_res_d/1108754.pdf

Angular momentum transfer and partition in the deep-inelastic reaction 664 MeV 84Kr + natAg

Both the magnitude and alignment of the transferred angular momentum in the reaction {sup 165}Ho + {sup 165}Ho have been measured as a function of Q value via continuum {gamma}-ray multiplicity and anisotropy techniques. Two regimes are observed: A low-Q-value regime where the aligned angular momentum component dominates over the random components, and a large-Q-value regime where the random components dominate and decrease the spin alignment.

/pdf/rise-and-fall-of-the-spin-alignment-in-deep-inelastic-2ongj4maoo.pdf

Rise and Fall of the Spin Alignment in Deep-Inelastic Reactions

Out-of-plane angular distributions have been measured for sequential alpha decay from target-like fragments produced in fully damped heavy-ion collisions Fragment spins were extracted from the angular distributions as a function of mass asymmetry These spins are in agreement with those obtained from a simultaneous gamma-ray multiplicity measurement Both the fragment kinetic energies and intrinsic spins are consistent with rigid rotation of an intermediate complex consisting of two substantially deformed spheroids

Rigid Rotation and l-Wave Fractionation in the Deep-Inelastic Reaction: 664-MeV 84Kr + natAg

The in-plane and out-of-plane anisotropy has been measured for ..gamma.. rays in coincidence with deep-inelastic products from the 1064-MeV /sup 136/Xe+/sup 197/Au reaction. The ..gamma..-ray energy spectra exhibit a bump corresponding to a dominantly stretched-E2 cascade, but only a small out-of-plane anisotropy, indicating a misalignment of the fragment spins. A simple model is used to extract a rms misalignment angle of 34/sup 0/ +- 7/sup 0/.

/pdf/fragment-spin-orientation-in-deep-inelastic-reactions-from-3ai9f7jt9n.pdf

Fragment spin orientation in deep-inelastic reactions from anisotropy measurements of continuum. gamma. rays

https://escholarship.org/content/qt29b106b1/qt29b106b1.pdf?t=p0lmfw

C.C. Hsu

Papers

Angular momentum transfer and partition in the deep-inelastic reaction 664 MeV 84Kr + natAg

Rise and Fall of the Spin Alignment in Deep-Inelastic Reactions

Rigid Rotation and l-Wave Fractionation in the Deep-Inelastic Reaction: 664-MeV 84Kr + natAg

Fragment spin orientation in deep-inelastic reactions from anisotropy measurements of continuum. gamma. rays

INTRINSIC FRAGMENT SPINS GENERATED IN THE REACTIONS OF 20Ne WITH 197Au AND 238U AT 12.6 MeV/NUCLEON