Conveners
Nuclear Reactions II: NR 4
- Kate Grzywacz (University of Tennessee Knoxville)
Nuclear Reactions II: NR 6
- Pieter Doornenbal (RIKEN)
Nuclear Reactions II: NR 8
- Pierre Capel (Johannes Gutenberg Universität Mainz)
Nuclear Reactions II: NR 10
- Kathrin Wimmer (GSI Helmholtzzentrum für Schwerionenforschung GmbH)
Nuclear Reactions II: NR 12
- Yutaka Watanabe (KEK WNSC)
The Active Target Time Projection Chamber (AT-TPC) has been used in experiments aimed at the exploration of structural effects in radioactive nuclei using one step reactions such as transfer or elastic and inelastic scattering. When used as a solenoidal spectrometer by placing it inside a magnetic field, the AT-TPC allows to perform this type of measurement in inverse kinematics with much...
Recent investigations into the inelastic scattering cross sections of neutrons and protons off $^{56}$Fe were conducted at the GELINA neutron source of the EC-JRC in Geel (Belgium) and at the 9 MV Tandem accelerator of IFIN-HH (Romania). For each reaction, distinct HPGe-based spectrometers were employed to determine the production cross section of the first transition in $^{56}$Fe...
Studying exotic nuclei exhibiting an extreme ratio of neutrons to protons is the primary means for better understanding of fundamental nuclear properties, which is crucial to comprehend the formation and existence of heavy elements in our universe. Nevertheless, it is well understood that nuclei from certain regions on the chart of nuclei, i.e., heavier and more neutron-rich than the heaviest...
The K500 Superconducting Cyclotron had been developed at Variable Energy Cyclotron Centre, Kolkata, for the basic nuclear physics experiment. Recently, the machine had delivered beam, for the first time, to the user for nuclear physics experiment. Detail characterization of the beams was performed with elastic scattering experiment with a 197Au target. Two independent approaches (one method by...
Since its inception, nuclear physics has used nuclear reactions to deepen our understanding of a quantum system as complex as the atomic nucleus. The arrival of the FAIR beams, in particular the improvement in the intensity delivered, and the development of state-of-the-art instrumentation, open up a wide range of possibilities for carrying out frontier experiments. R3B is a scientific...
In the region of the neutron deficient pre-actinides, around 198Pb and 180Hg, there is an unexpected island of asymmetric fission. That these asymmetric fission decay modes evaded detection until recently, but now are feasible, is a testament to the capabilities of rare isotope facilities. To develop a method to determine fission barriers for rare isotopes and to study the transition between...
Astrophysical objects such as neutron star formation and structure and supernovae explosion, as well as nuclei properties and structure are described using the equation of state of nuclear matter. However, the coefficients of the equation state describing the nuclear matter with a huge charge asymmetry, notably the symmetry energy, is lacking constraints [1,2].
When a medium-to-heavy...
Mirror energy differences act as a magnifying glass into the evolution of the nuclear structure phenomena as a function of angular momenta. In recent years, detailed studies aimed to probe the influence of isospin non-conserving interaction and the effects of halo orbits and their occupation on the displacement of analogue excited states of mirror partners were performed, showing excellent...
Obtaining reliable cross sections for neutron-induced reactions on unstable nuclei nuclei is crucial to our understanding of the stellar nucleosynthesis of heavy elements and for applications in nuclear technology. However, the measurement of these cross sections is very complicated, or even impossible, due to the radioactivity of the targets involved. Our aim is to circumvent this problem by...
The exploration of heavier elements has resulted in several unexpected discoveries and has enhanced our understanding of nuclear synthesis and related phenomena. Although new elements and their isotopes have been synthesized, the amount of information with the Z ≥ 102, remains somewhat scarce. Also, the nuclear shell effects are of significant relevance for ensuring nuclear stability. Our...
Heavy ion collisions are a powerful tool to explore nuclear matter at sub-saturation densities. Central collisions for 58,62Ni+40,48Ca systems at 25 and 35 AMeV were studied benefiting of the peculiarities of the CHIMERA 4π multidetector [1], an experimental apparatus installed at INFN-LNS in Italy, characterised by low identification thresholds, measurement of velocity by time-of-flight...
The ‘island’ of fission isomers identified in the actinide region ($Z$ = 92 - 97, $N$ = 141- 151) originates from multi-humped fission barriers, which can be described as the result of superimposing microscopic shell corrections to the macroscopic liquid drop barrier. For the first time, populating fission isomers by using the in-flight fragmentation and the electromagnetic dissociation...
We present new data for the $^{19}$F(p,$\alpha_0$)$^{16}$O and $^{19}$F(p,$\alpha_\pi$)$^{16}$O$^*$ reaction channels in the energy region close to the Coulomb barrier, thanks to a new experiment performed at the Singletron accelerator, in Catania (Italy). This measure allowed us to to extract new integrated cross section data and to reach two important goals: i) to solve an important...
Alpha clustering is a crucial concept to understand nuclear structures. Alpha particles, which are tightly bound with no excited states up to $E_x\sim 20$ MeV, often behave as well established subunits in nuclei, forming what are known as alpha cluster states.
Of particular interest are alpha condensed states where all alpha clusters are condensed into the lowest s orbit. Due to this unique...
We report new data on the 3He+13C->4He+12C* reaction investigated at very low bombarding energy with the solid-state OSCAR hodoscope at the AN-2000 accelerator of INFN-LNL.
Thanks to the excellent identification capabilities of the HELICA setup, several nuclear reactions, including 13C(3He,p)15N, 13C(3He,d)14N, 13C(3He,alpha)12C, leading the residual nucleus to several excited states, were...
The nuclear clustering is a cutting-edge topic with a rich historical background. It has been established for light nuclei, such as the Hoyle state in $^{12}$C, and in alpha-decay nuclei. However, quite little is known in the case of medium and medium heavy nuclei. Furthermore, an important question is remain unanswered: How can the mean-field picture be compatible with that with...
Double Gamow-Teller (DGT) transition is a nuclear process such that both of the spin and the isospin are flipped twice, which is represented by the double $\beta$ decay. The nuclear response of the DGT transition is hardly known especially for the high excitation energy region. Although DGT giant resonance (DGTGR) is predicted[1], it still remains unobserved. The experimental observables of...
Neutrinoless double-beta decay is a hypothetical weak-interaction process in which two neutrons inside an atomic nucleus simultaneously transform into protons and only two electrons are emitted. Since the electrons are emitted without accompanying antiparticles, the process violates the lepton-number conservation and requires that neutrinos are Majorana particles, hence providing unique vistas...
Barrier passing models of fusion implement absorption (irreversible energy dissipation) through an incoming-wave boundary condition or imaginary potential located inside the barrier, ensuring separation between channel coupling effects and absorption. Couplings to few-nucleon transfer channels are found to be important in selected cases, otherwise nuclei fuse essentially unchanged....
Fusion forming superheavy elements is strongly inhibited by the faster non-equilibrium Deep Inelastic (DIC) and quasifission processes. Long considered distinct, recent extensive measurements at ANU$^{1,2,3}$ indicate that they form a continuum.$^{1}$
For reactions with non-fissile heavy nuclei, a novel experimental approach$^{2}$ gave direct information on the time dependence of mass...
The neutron-rich isotopes of hydrogen, such as $\rm ^{6}H$ and $\rm ^{7}H$, are good platforms for the study of NN interactions in neutron-rich environments because they have the largest neutron-to-proton ratios known so far. However, the experimental and theoretical studies of them are still limited. For $\rm ^{6}H$, the energy of its ground state is still controversial. It is about 2.7 MeV...
