Conveners
Nuclear reactions
- Roberto Capote (International Atomic Energy Agency)
Nuclear reactions
- Marc Dupuis (CEA)
Nuclear reactions
- Toshihiko Kawano (Los Alamos National Laboratory)
Heavy ion charge exchange reactions are of manyfold interest for nuclear reaction and structure physics. A new theoretical approach is presented, emphasizing the role of single and double charge exchange reactions for probing nuclear response functions as encountered in single and double beta decay. In particular, a special class of nuclear double charge exchange (DCE) reactions proceeding as...
Recent developments in nuclear structure approaches offer a great
mean to improve various aspects of nuclear reaction modeling and to
further understand reaction mechanisms from a microscopic point of
view. Recently, direct and pre-compound nucleon emission, for nucleon
induced reaction on spherical and axially deformed nuclei, have been
successfully modeled [1] using a description of target...
There is recently renewed interest in the study of single and double charge exchange reactions with heavy ions. We report here a preliminary theoretical study of double charge exchange (DCE) reactions in terms of two successive charge exchanges (SCE) in second order Distorted Wave Born approximation.
We look in particular at the conditions where the corresponding cross section can be...
The Zirconium isotopic chain, where rather abrupt changes in nuclear properties are experimentally observed, in special along the N=50 to 60 region, has attracted renewed interest in recent years. In particular, a group of authors of the University of Tokyo (1) after performing large-scale Monte Carlo shell-model calculations claims that a “Quantum Phase Transition” is observed in the...
A good understanding of neutron scattering mechanisms and prediction capacity of associated
cross sections is crucial to many nuclear technologies, among which all kinds of reactors based on
fission process. For deformed nuclei, the computation of scattering observables for the elastic
channel and the first, low-lying excited states requires coupled channel calculations....
see the attached pdf
Nucleon-induced pre-equilibrium reactions are now recognized as consisting almost exclusively of direct reactions in which incident nucleons induce excitations over a wide range of energy in the target nuclei. At low energies, one step reactions dominate. As the incident energy increases, multi-step reactions become important too. Tamura, Udagawa and Lenske pioneered the use of the RPA...
Nucleon-induced pre-equilibrium reactions are predominantly direct reactions. At low incident energies, excitation of all but the lowest energy collective states can be well described in terms of one-step reactions that produce particle-hole pairs. As the incident energy is increased, more complex excitations involving two or more particle-hole pairs become accessible through multi-step...
The pre-equilibrium proton induced emission of light complex nuclei with energies in the continuum has been studied comprehensively for many years. Double-differential cross sections and especially analyzing power distributions are typical of an intranuclear nucleon-nucleon multistep statistical re-
action mechanism. The final stage of the reaction may be a result of a direct
pickup or...
Obtaining reliable data for nuclear reactions on unstable isotopes remains an extremely important task and a formidable challenge. Neutron capture cross sections -- crucial ingredients for models of astrophysical processes, national security applications and simulations of nuclear energy generation -- are particularly elusive, as both projectile and target in the reaction are unstable. Various...
Capture processes of neutrons, starting from thermal region up to 14 MeV, on 147Sm, with emission of charged particles, were analyzed. Cross sections for (n,a) reactions, from slow neutrons resonance neutrons up to some MeV’s, in the frame of Hauser – Feshbach formalism (HFF), were evaluated using computer codes realized by authors. The main element of HFF is represented by the transmission...
The statistical model of compound nucleus reactions is widely used to calculate reaction observables for basic nuclear science, astrophysics, and nuclear technology. The prediction that neutron resonance reduced widths are distributed according to the Porter-Thomas distribution (PTD) is a cornerstone of the statistical model. Consequently, the recently measured deviations from the PTD for...
Transfer reactions have been proven to be a powerful tool to understand nuclear structure. Two different physical aspects are being investigated with the use of transfer reactions on $^{56}Ni$, which is a $N=Z$ unstable doubly magic nucleus.
$i)$ To probe the gap of $N=28$, we study the spectroscopy of the $N=29$ and $N=27$ isotones by the $(d,t)$, $(p,d)$ and $(d,p)$ one nucleon transfer...
The production of neutron-rich nuclei in the mass region A ~ 200, in particular along the neutron closed shell N = 126, has recently received strong attention since these nuclei are fundamental to understand different physical aspects, from the shell evolution far from stability to the investigation of the path chosen by the r-process to synthesize the heavy elements. The difficulties in...
The two mirror rp-reactions $^{34}$S(p,$\gamma$)$^{35}$Cl and
$^{34g,m}$Cl(p,$\gamma$)$^{35}$Ar were studied via a shell-model approach.
At energies in the resonance region
near the proton-emission threshold many negative-parity states appear.
We present results of calculations in a full (0$+$1)$ \hbar \omega $
model space which addresses this problem. Energies, spectroscopic
factors and...
