The nickel isotopes offer a unique laboratory to investigate shape evolution in the vicinity of doubly-magic N=Z nucleus, $^{56}$Ni (Z=N=28), which should exhibit similar structural properties to those observed in the Z=N=20 region. Indeed, observation of the SD structures was reported also in $^{56}$Ni, explained as the result of $mp-mh$ excitations like in the case of $^{40}$Ca. However,...
We report on the current status of the Coulomb excitation experiment on $^{82}$Se performed at INFN-LNL using the AGATA array and the SPIDER particle detector. The experiment aimed to investigate the low-lying nuclear structure of $^{82}$Se through safe Coulomb excitation. Preliminary analysis of the online data has provided encouraging results, including clear identification of key...
Experiment 23.054 was proposed to clarify the possible shape coexistence in the nucleus 106Pd. Around the Z=50 shell closure, shape coexistence has been firmly established in several isotopic chains, particularly in the tin and cadmium isotopes. Intruder states have also been identified in the palladium isotopes. Nevertheless, the coexistence of different shapes has not yet been unambiguously...
The performance of γ-ray tracking with AGATA critically depends on the accuracy of Pulse-Shape Analysis (PSA), which in turn is governed by the fidelity of the signal basis describing detector response. The currently employed AGATA Data Library (ADL) basis is derived from simulations, and its limitations are widely recognized as a key factor constraining the achievable position resolution. To...
The $^{12}$C + $^{16}$O reaction plays a particularly important role in both the carbon and oxygen-burning phases of stars. Fang et al. measured this reaction in a thick-target experiment a few years ago, with both singles and particle-γ coincidence techniques down to a few nanobarns. However, the lowest energy points suffer from large experimental uncertainties which prevent discriminating...
We will present the progress of the data analysis for the PRISMA + AGATA experiment titled "Probing nucleon-nucleon correlations in the $^{48}$Ca + $^{208}$Pb system below the Coulomb barrier", conducted in March 2023 at LNL. The experiment aimed to measure the transfer probabilities for multi-neutron and multi-proton transfer channels in the $^{48}$Ca + $^{208}$Pb system at energies close to...
Lifetime measurements are commonly used to unravel the nature and properties of nuclear states, as they are closely related to transition probabilities, which provide information on the nuclear wave functions. The experiment presented here aimed to study the interplay of spherical (0 ℏω) and intruder (2 ℏω) configurations in the low-lying states of isotopes on the edge of the N=20 island of...
The region around doubly magic $^{48}$Ca is a cornerstone of our understanding of nuclear structure, characterized by the appearance of subshell closures at N=32 and 34 [1], and by the gradual disappearance of N=28 shell closure below Z=20 [2]. However, several experimental findings have challenged this understanding. Large charge and matter radii were found in $^{51-53}$Ca [3,4], showing...
The experiment 22.101 is a joint experiment to address four different physics cases devoted to studying the physics of the $\nu g_{9/2}$ beyond $N = 40$. These are aimed at investigating:
• Collectivity and seniority conservation in the $\nu g_{9/2}$ orbital
• Shape coexistence and octupole vibrations in $^{68}$Ni
• Island of inversion and the role of intruders at $N ∼ 40$
For these...
Coexistence between spherical and deformed shapes is largely found in and near semi-magic or doubly-magic nuclei.
The region between the doubly-magic $^{48}$Ca and $^{56}$Ni nuclei is predicted to present phenomena of shape coexistence, although experimental information on E0 and E2 transition strengths connecting deformed and spherical configurations remains rather limited. In $^{52}$Cr...
The appearance of a subshell closure in $^{56}$Cr (N=32) is confirmed by high excitation energy of the 2$^{+}_{1}$ state and reduced B(E2;2$^{+}_{1}\rightarrow$0$^{+}_{1}$) but shell model calculations do not reproduce the drop of collectivity at N=32.
The discrepancy between the experimental data and the theoretical calculations for $^{56}$Cr may be as a result of coexisting shapes in this...
Multinucleon transfer (MNT) reactions provide a powerful approach to access exotic neutron-rich nuclei. Excited reaction products have been measured in $^{136}\text{Xe}$ + $^{208}\text{Pb}$ at 1 GeV with the high-resolution $\gamma$-ray tracking array AGATA coupled to the mass spectrometer PRISMA at LNL (INFN, Italy) positioned at the grazing angle. For the beam-like fragments, energy E,...
In December 2022, an experiment was performed at INFN-LNL with a $^{208}$Pb beam at 1300 MeV impinging on a $^{9}$Be target, using the inverse kinematics fusion-fission reaction for both nuclear structure and reactions studies. The experiment was performed using the AGATA $\gamma$-ray tracking array coupled to the magnetic spectrometer PRISMA [1-3].
This setup allowed one to measure the...
We report preliminary results from the measurements of the superallowed $^{10}$C β-decay branching ratio with the AGATA HPGe tracking array at INFN-LNL. The precedent experiment, Exp. 22. 72 was performed in June 2023. A 10-MeV proton beam accelerated from the Tandem-XTU impinged to a 1-mg/cm$^2$-thick, Au-sandwiched $^{10}$B target. The experiment was run in two modes: in-beam mode and decay...
Inverse beta decay (IBD) is a crucial process historically employed to study neutrinos.
For example, discrepancies between measured and expected IBD rates on ($^{71}\text{Ga}$), the so-called gallium anomaly, suggest the possible existence of sterile neutrinos. A recent publication showed that the poorly known associated Nuclear Matrix Element (NME) can be extracted measuring the decay...
Sub-barrier transfer experiments have been recently carried out at LNL in the 60Ni+116Sn system, where the two neutron transfer channel is well Q-value matched. Reaction products have been detected in inverse kinematic and at forward angles with the large solid angle magnetic spectrometer PRISMA, providing high efficiency and resolution. In these studies one follows the behavior of the...
