14th International Conference on Nucleus-Nucleus Collisions (NN2024)

Session

Nuclear Reactions II

19 Aug 2024, 16:40

Whistler Conference Centre

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)

283. Reaction Studies with the Active Target Time Projection Chamber

Daniel Bazin (Michigan State University)

19/08/2024, 16:40

Nuclear Reactions

Invited Talk

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...

6. Neutron and Proton Inelastic Scattering on ${}^{56}$Fe: Insights from the GELINA-Geel and 9-MV Tandem-Bucharest Measurements

Dr Adina Coman (Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH))

19/08/2024, 17:05

Nuclear Reactions

Contributed Oral

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...

116. First Test of MNT Reactions with Secondary Beams at the FRS Ion Catcher

Dr Ali Mollaebrahimi (Justus-Liebig-University Giessen and TRIUMF)

19/08/2024, 17:20

Nuclear Reactions

Contributed Oral

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...

166. First In-Beam Experiment in K500 Superconducting Cyclotron at VECC

Dr Tapan Kumar Rana (Variable Energy Cyclotron Centre)

19/08/2024, 17:35

Nuclear Reactions

Contributed Oral

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...

339. Physics Opportunities with Relativistic Rare Ion Beams at R3B

Dolores Cortina Gil (Instituto de Física Corpuscular IFIC (CSIC-UV))

20/08/2024, 14:40

Nuclear Reactions

Invited Talk

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...

343. Studying Fission Cross Sections near 198Pb with Rare Isotope Beams

William Lynch (FRIB and the Dept. of Physics and Astronomy Michigan State Univ.)

20/08/2024, 15:05

Fusion and Fission

Invited Talk

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...

70. Probing the Pygmy Dipole Resonance of 50Ca by Coulomb Excitation

Julien Lemarie (RIKEN - JSPS)

20/08/2024, 15:30

Nuclear Reactions

Contributed Oral

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...

115. First In-Beam Spectroscopic Study of the T=3/2 p-Unbound ${}^{55}$Cu

Sara Pigliapoco (University of Padova, INFN)

20/08/2024, 15:45

Nuclear Reactions

Contributed Oral

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...

54. Surrogate Reactions in Inverse Kinematics at Heavy-Ion Storage Rings

Beatriz Jurado

21/08/2024, 08:30

Nuclear Reactions

Invited Talk

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...

141. Exploration of the Decay Mechanisms and Associated Aspects of Z = 102 Nobelium Nucleus

Ms Shubhpreet Kaur (Thapar institute of Engineering and Technology, Patiala, Punjab)

21/08/2024, 08:55

Nuclear Reactions

Contributed Oral

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...

118. Fragments Features and Isoscaling in Ni+Ca Systems at the Entrance of Fermi Energy Domain

Elena Geraci (Dipartimento di Fisica e Astronomia "Ettore Majorana", Università degli Studi di Catania - Catania, Italy & INFN, Sezione di Catania, Catania, Italy)

21/08/2024, 09:10

Nuclear Reactions

Contributed Oral

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...

151. (Zoom) Fission Isomer Studies at FRS and IGISOL

Dr Jianwei Zhao (GSI Helmholtzzentrum für Schwerionenforschung)

21/08/2024, 09:25

Fusion and Fission

Contributed Oral

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...

43. New Measurements of the ${}^{19}$F(p,${\alpha }_0$)${}^{16}$O and ${}^{19}$F(p,${\alpha }_{\pi }$)${}^{16}$O${}^{\ast }$ Reaction Cross Sections close to the Coulomb Barrier

Luigi Redigolo (Università di Catania / INFN, Sezione di Catania, Italy)

21/08/2024, 09:40

Nuclear Reactions

Contributed Oral

We present new data for the ${}^{19}$F(p,${\alpha }_0$)${}^{16}$O and ${}^{19}$F(p,${\alpha }_{\pi }$)${}^{16}$O${}^{\ast }$ 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...

309. Search for Alpha-Condensed States in ${}^{20}$Ne and ${}^{24}$Mg

Takahiro Kawabata (Department of Physics, Osaka University)

22/08/2024, 14:40

Nuclear Reactions

Invited Talk

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...

38. Cluster States at Very High Excitation Energy in 16O

Luigi Redigolo (Università di Catania / INFN, Sezione di Catania, Italy)

22/08/2024, 15:05

Nuclear Reactions

Contributed Oral

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...

68. ONOKORO Project: Comprehensive Research of Cluster Formation in Medium to Heavy Nuclei

Yuki Kubota (RIKEN Nishina Center)

22/08/2024, 15:20

Nuclear Reactions

Contributed Oral

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...

143. The Observation of Double Gamow–Teller Giant Resonance Using Double Charge Exchange (12C, 12Be(0+2)) Reaction

Akane Sakaue (CNS)

22/08/2024, 15:35

Nuclear Reactions

Contributed Oral

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...

204. Charge-Exchange Reactions as Probes of Neutrinoless Double-Beta Decays

Lotta Jokiniemi (TRIUMF)

22/08/2024, 15:50

Nuclear Reactions

Contributed Oral

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...

33. Colliding Heavy Nuclei Have Multiple Identities on the Path to Fusion

Kaitlin Cook (Australian National University)

22/08/2024, 16:40

Nuclear Reactions

Invited Talk

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....

45. A New Understanding of Quasifission and Deep Inelastic Collisions: Non-Equilibrium Competitors to Superheavy Element Fusion

David Hinde (Australian National University)

22/08/2024, 17:05

Nuclear Reactions

Contributed Oral

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...

11. (Zoom) Study of the Neutron-Rich Nucleus ${}^6\mathrm{H}$ in Electron Scattering Experiment at MAMI-A1

Tianhao Shao (Fudan University)

22/08/2024, 17:20

Nuclear Reactions

Contributed Oral

The neutron-rich isotopes of hydrogen, such as ${}^6\mathrm{H}$ and ${}^7\mathrm{H}$, 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 ${}^6\mathrm{H}$, the energy of its ground state is still controversial. It is about 2.7 MeV...