Colloque GANIL 2026

Session

Shell evolution

21 sept. 2026, 11:05

Présidents de session

Shell evolution

• Frédéric Nowacki (IPHC Strasbourg)

Shell evolution

• BEATRIZ FERNANDEZ DOMINGUEZ (USC)

Shell evolution

• Il n'a pas de président de session pour ce bloc

36. Study of stretched states at CCB

Natalia Cieplicka-Orynczak (Institute of Nuclear Physics Polish Academy of Sciences)

21/09/2026 11:05

Invited Presentation (Only for invited speakers)

Stretched resonances represent a unique class of high-lying nuclear excitations, characterized by a relatively simple structure. Their wave functions are dominated by a single particle-hole configuration, in which both the particle and the hole occupy orbitals with the highest angular momentum in their respective shells and couple to the highest possible spin value.

In light nuclei,...

71. Invited talk

Agota Koszorus (KU Leuven, SCK CEN)

21/09/2026 11:30

16. Shell evolution investigated in 10Be, 12Be and 20O using solid and active targets

Miguel Lozano-González (IGFAE-USC)

21/09/2026 11:55

Oral Presentation

Current experimental and theoretical efforts focus on shell-structure evolution to explain the variation of magic numbers with isospin asymmetry and to constrain the underlying nucleon-nucleon interactions. Advanced shell-model interactions attribute this to the monopole part of the nuclear Hamiltonian, for which additional experimental information on the two-body matrix elements is essential...

18. Interplay between quadrupole deformation and proton-neutron pairing through the prism of Anderson's limit

Hugo JACOB (GANIL)

21/09/2026 12:15

Oral Presentation

Proton-neutron pairing is an exotic type of pairing that appears in nuclei with $N\sim Z$, as pairing requires an important overlap of the wave functions at the Fermi surface. Unlike standard like-particle pairing (neutron-neutron, proton-proton) that exists only in the isovector ($T = 1$) channel, proton-neutron pairing can exist in both the isovector and isosacalar ($T = 0$) channels. The...

25. Investigating the Shell Evolution and Neutron Structure of $^{68}$Ni through (d,p) and (p,d) Transfer Reactions

Prabhat Sharma (GANIL)

21/09/2026 12:35

Oral Presentation

The evolution of nuclear shell structure in exotic nuclei provides key insights into the
fundamental nature of nuclear forces. In nuclei far from stability, conventional magic
numbers can disappear, while new ones may emerge, a phenomenon known as shell evolution [1].
A well-known example is the evolution of the N=28 shell gap from $^{40}$Ca to $^{48}$Ca,
which has been successfully...

43. Quadrupole and octupole collectivity in 106Cd explored via "unsafe" Coulomb excitation

Desislava Kalaydjieva (University of Guelph)

21/09/2026 12:55

Oral Presentation

Stable cadmium isotopes were thought to have spherical ground states due to their phonon-like level structure, however, this was put into question in recent studies that suggested shape coexistence in $^{110,112}$Cd [1]. Further evidence supporting the presence of ground-state deformation in mid-shell Cd nuclei came from a Coulomb-excitation study of $^{106}$Cd [2] in line with...

74. Invited talk

Olivier Sorlin (GANIL)

22/09/2026 09:00

75. Invited talk

Pepijn Demol

22/09/2026 09:25

56. First in-beam gamma-ray spectroscopy of (n, xn) reactions with EXOGAM at NFS

Hemantika SENGAR (GANIL)

22/09/2026 09:50

Oral Presentation

Fast-neutron-induced nxn reactions occupy a region of reaction phase space that has never been explored from the perspective of nuclear structure studies. Compared to fusion-evaporation they transfer modest angular momentum and populate states off the yrast line; compared to transfer reactions they impose no single-particle selectivity and reach residual nuclei through statistical population...

11. Cluster structure of the ground state of light exotic nuclei beyond alpha clustering

Valerian Girard-Alcindor (IJCLab)

22/09/2026 10:10

Oral Presentation

Understanding how cluster structures emerge within neutron-rich nuclei has become of great relevance in nuclear structure physics and it has been subject of different approaches of study. The present work aims to investigate this phenomenon in the ground state of light neutron-rich nuclei beyond alpha-clustering in the beryllium isotope chain via $^{10}$Be(p,$\alpha$)@38MeV/u and...

33. Is there an Isobaric Analog State of the Tetra-Neutron in hydrogen-4 ?

Quentin Délignac (IJCLab)

22/09/2026 10:30

Oral Presentation

The existence of tetra-neutron ($^{4}$n) has been a long-standing question in nuclear physics and few-body neutron systems are of great interest for understanding nuclear forces and the structure of neutron-rich matter. Since the beginning of the century, the discovery of possible candidate for the $^{4}$n state, has been reported several times. However, it triggered a lot of debate about the...

6. Regularities and inheritance near N = 126 probed by beams far from the valley of stability

Dr Navin ALAHARI (GANIL)

23/09/2026 11:00

Shell evolution

Invited Presentation (Only for invited speakers)

The study of the evolution of properties of the nucleus as a function of excitation energy, angular momentum and isospin is a path for searching for simple patterns to understand its structure. Among challenging problems in physics is the understanding of emergent collective excitation modes in interacting quantum many-body systems in terms of the microscopic degrees of freedom. Such...

12. Spectroscopy of neutron-rich Li isotopes for the s2384 experiment with ACTAR TPC

Iván Blanco Calviño (IGFAE-USC)

23/09/2026 11:25

Oral Presentation

Neutron-rich lithium nuclei are ideal systems for studying the interplay between many-body correlations and the properties of the particle continuum. For example, $^{11}$Li and $^{12}$Li have a large neutron-to-proton imbalance and a very low neutron-separation energy, and their structure is expected to be influenced by coupling to the continuum. To date, only a few models, like the Gamow...

37. Exotic phenomena at the dripline : the most neutron-rich boron isotopes

Emeline Oliveira (CEA IRFU-DPHN)

23/09/2026 11:45

Oral Presentation

The study of nuclei around the neutron dripline allows to investigate surprising or unexpected phenomena that occur at the edges of the nuclear landscape. Neutron-rich nuclei provide access to regimes where the description of states becomes sensitive to nucleon-nucleon interactions, and the structure models to be challenged. In this context, the boron isotopic chain is an ideal case of study...

38. Probing spin-orbit splitting and shell evolution in $^{34}$Si via the $^{34}$Si$(p,d)$$^{33}$Si transfer reaction

Raquel Nicolás Del Álamo (INFN Padova and Università degli studi di Padova)

23/09/2026 12:05

Oral Presentation

Exotic nuclei offer a unique window into the fundamental properties of nuclear forces, particularly through the evolution of their shell structure. Far from the valley of stability, canonical magic numbers are no longer preserved: shell gaps can weaken or vanish entirely, driven by the proton-neutron interaction at the microscopic level. The monopole component of this interaction is understood...

39. Probing the low-spin structure of $^{46}$K via $^{46}$Ar~$\beta$ decay

Sara Pigliapoco (GANIL)

23/09/2026 12:25

Oral Presentation

Beta-decay studies provide a powerful and selective tool for investigating low-spin states in atomic nuclei, offering information that is complementary to, and often extends, that obtained from direct reaction studies.
In this work, we present a study of low-spin excited states in $^{46}$K, populated via the $\beta$ decay from the $0^{+}$ ground state of $^{46}$Ar. The nucleus $^{46}$K...

49. Shell evolution in oxygen probed through unbound states via 19O(d,p$\gamma$)

Charlie James PAXMAN (GANIL)

23/09/2026 12:45

Oral Presentation

The neutron dripline in oxygen isotopes presents a clear challenge and unique opportunity for studies of shell evolution and nuclear structure. The heaviest observed bound isotope of fluorine (Z=9) has 22 neutrons, whereas oxygen -- with only one fewer proton, Z=8 -- can only bind 16 neutrons. This striking anomaly is a result of an increase in the spacing between the $\nu$(d$_{3/2}$) orbital...