M. Youngs

Democratic Decay ofBe6Exposed by Correlations

The interaction of an E/A=70-MeV (7)Be beam with a Be target was used to populate levels in (6)Be following neutron knockout reactions. The three-body decay of the ground and first excited states into the α+p+p exit channel were detected in the High Resolution Array. Precise three-body correlations extracted from the experimental data allowed us to obtain insight into the mechanism of the three-body democratic decay. The correlation data are in good agreement with a three-cluster-model calculation and thus validate this theoretical approach over a broad energy range.

Characterizing Neutron-Proton Equilibration in Nuclear Reactions with Subzeptosecond Resolution

We study neutron-proton equilibration in dynamically deformed atomic nuclei created in nuclear collisions. The two ends of the elongated nucleus are initially dissimilar in composition and equilibrate on a subzeptosecond time scale following first-order kinetics. We use angular momentum to relate the breakup orientation to the time scale of the breakup. The extracted rate constant is 3u2009u2009zs^{-1}, which corresponds to a mean equilibration time of 0.3xa0zs. This technique enables new insight into the nuclear equation of state that governs many nuclear and astrophysical phenomena leading to the origin of the chemical elements.

Novel technique to extract experimental symmetry free energy information for nuclear matter

A new method of accessing information on the symmetry free energy from yields of fragments produced in Fermi-energy heavy-ion collisions is proposed. Furthermore, by means of quantum fluctuation analysis techniques, correlations between extracted symmetry free-energy coefficients with temperature and density were studied. The obtained results are consistent with those of commonly used isoscaling techniques.

Equilibration chronometry: characterizing neutron-proton equilibration within a strongly deformed nuclear system with sub-zeptosecond resolution

Neutron-proton equilibration was studied in dynamically-deformed nuclei produced in reactions

2p-2p decay of {sup 8}C and isospin-allowed 2p decay of the isobaric-analog state in {sup 8}B

^{70}

Studying heavy-ion collisions with coverage near zero degrees using FAUST–QTS

Zn+

Coulomb corrections to experimental temperatures and densities in Fermi-energy heavy-ion collisions

^{70}

Studying heavy-ion collisions with FAUST-QTS

Zn at 35A MeV. The composition of the two largest daughters of each excited projectile-like fragment is examined as a function of alignment angle. The lighter fragment is initially neutron rich relative to the heavier fragment, and the compositions evolve towards each other exponentially with increasing angle. The alignment angle, as a result of rotation, is related to time through the angular momentum of the projectile-like fragment, and a rate constant of 3 zs

Neutron-proton equilibration in 35 MeV/u collisions of 64,70Zn + 64,70Zn and 64Zn,64Ni + 64Zn,64Ni quantified using triplicate probes

^{-1}

The partial truncated icosahedron phoswich array for detection of low energy charged pions and light charged particles

is extracted. This corresponds to a mean equilibration time of 0.3 zs. This technique provides a new window through which to gain insight into the nuclear equation of state.