7th Pre-PAC Workshop for AGATA@LNL

10 Jul 2025, 09:00 → 11 Jul 2025, 18:00 Europe/Rome

INFN-LNL

Alain Goasduff (INFN Laboratori Nazionali di Legnaro), Magda Zielinska (CEA Saclay)

Link Zoom: https://infn-it.zoom.us/j/83269236390

 

We are pleased to announce the seventh Pre-PAC Workshop for the AGATA physics campaign at LNL. It will take place on July 10^th-11^th 2025 at the Legnaro National Laboratories and is planned to be held in person, with an option of on-line participation. This pre-PAC will be the last one for the AGATA-PRISMA configuration before moving to the zero-degree campaign during the second semester of 2026. It will be the last pre-PAC covering physics cases that require PRISMA. 

 

The forthcoming LNL PAC meeting is planned for October 2025 and will evaluate experiments to be performed from October 2025 until end of July 2026. For the first part of the beam time, indicatively until March 2026, only beams from the TANDEM accelerator will be available at LNL. Starting from spring 2026, TANDEM-PIAVE-ALPI beams will also be available including the newly developed ²³⁸U beams. AGATA is expected to consist of a minimum of 12 triple clusters.

 

The aim of the Pre-PAC Workshop is to assist the spokespersons in putting the strongest cases for their proposals forward, through a discussion of the physics to be investigated, and to assess the feasibility of the proposed experiments. This includes all experiments planning to use stable beams from the TANDEM and TANDEM-PIAVE-ALPI accelerators, and unstable beams produced in the EXOTIC facility. The experiments could be involving AGATA in a possible combination with PRISMA and/or ancillary detectors listed below. Any new projects will have to be presented at this workshop before being submitted to the LNL PAC. In most cases, we will not expect presentations of the projects that have already been discussed at the previous Pre-PAC Workshops. If, however, a new project shows a considerable overlap with a previously discussed project of a different group, both parties will be informed and encouraged to participate to the upcoming Workshop.

 

You are welcome to submit Letters of Intent (LoIs) for AGATA in configuration with PRISMA and TANDEM/TANDEM-PIAVE-ALPI beams, as well as LoIs for the EXOTIC facility, with a deadline on June 20^th, 2025. The LoIs are expected to include, in a pdf file, a title, a short abstract with a description of the physics case and the experimental setup, details on the wanted beam (energy, intensity), target(s), and the justified request of beam time.

 

We warmly recommend the LoI spokespersons to contact as soon as possible the experts of the complementary equipment they intend to use. These contact persons are:

• PRISMA and PRISMA second arm : L. Corradi, F. Galtarossa
• SAURON : M. Balogh, E. Pilotto
• AGATrace : S. Capra
• SPIDER: N. Marchini, M. Balogh
• DANTE: K. Rezynkina, B. Gongoras
• Gamma-ray scintillators: A. Giaz
• Plunger: F. Angelini
• EXOTIC : S. Pigliapoco, M. Mazzocco

 

Note that, due to the installation of the new electronics for the AGATrace array, the EUCLIDES detector will not be available for this call.

The second arm of PRISMA, for kinematics coincidence with PRISMA will be installed in the last part of the campaign. For any question regarding the configuration please contact the people in charge.

 

PRISMA second arm ("NOSE"):

Heavy-ion detector composed of two sub-detectors:
- MWPPAC -> Area: 100 x 100 mm². Position resolution: ~ 1 mm. Time resolution: ~ 350 ps.
- Axial ionization chamber (Bragg chamber) -> Active length: 340 mm. Operation gases: CH4 or CF4. Energy resolution: DE/E ~ 1 %. Z resolution DZ/Z ~ 2 %

Distance MWPPAC-target = 50 cm. Solid angle subtended by the detector: ~ 30 msr. Relative angle between PRISMA and NOSE: 70 degrees. The maximum rate sustainable by the Bragg chamber is ~ 2-3 kHz.
The center of the detector is out of center by 17.5 mm in the vertical direction with respect to the beam direction due to mechanical constraints.

Reference papers: E. Fioretto et al., Nuclear Inst. and Methods in Physics Research, A 899 (2018) 73–79
                                  F. Galtarossa et al., Phys. Rev. C 97 (2018) 054606

AGATA_7thPrePAC_Workshop_LNL_First_circular.pdf

concluding_prepac.pptx

il-canzoniere.jpg

List_beams_TAP.pdf

privacy_policy_statement_pre-PAC AGATA.pdf

Thursday 10 July

13:30 → 14:00 Registration

7th pre-PAC AGATA@LNL info slides_July 2025.pptx

14:00 → 15:10 Introduction

Convener: Andres F. Gadea Raga (IFIC CSIC-University of Valencia)

14:00 Welcome from the Director

Speaker: Faical Azaiez (Istituto Nazionale di Fisica Nucleare)

14:10 LNL Accelerator Status

Speaker: Enrico Fagotti (Istituto Nazionale di Fisica Nucleare)

LNL Accelerator Status - Pre-PAC AGATA.pptx

14:30 AGATA status

Speaker: Dr Alain Goasduff (INFN Laboratori Nazionali di Legnaro)

status_agata_prePAC.pptx

14:50 Summary of LoIs

Speaker: Magda Zielinska (CEA Saclay)

15:10 → 15:40 Coffee break

15:40 → 18:20 Session 1

Convener: Franco Galtarossa (Istituto Nazionale di Fisica Nucleare)

15:40 Synthesis of Heavy and Superheavy Neutron-Rich Nuclei in Multinucleon Transfer Reactions at Grazing Angle Using Uranium Beams

Information on the heaviest elements has been obtained up to now via fusion evaporation reactions. It is however well known that the only nuclei one can reach using fusion-evaporation reactions are neutron deficient and moreover in a very limited number due to the restricted number of beam-target combinations. An alternative to fusion-evaporation could be deep-inelastic collisions. Theoretical calculations predict
large cross-sections for neutron-rich heavy elements production close to zero degrees and at grazing angles. We recently performed an experiment at Argonne National Laboratory using a 136Xe beam on a 238U target. The preliminary results are promising.
The goal of this proposal is to investigate deep inelastic reaction mechanisms in the heavy elements’ region using the AGATA germanium array and DANTE detector coupled to the PRISMA separator. Using a 238U beam on a 64Ni target at grazing angles. Such an experiment would pave the way for future synthesis on the synthesis of new superheavy neutron-rich isotopes.

Speaker: Mrs barbara Sulignano (CEA Saclay)

LOI_2025_AGATA_sulignano.pdf

16:00 Production yields of neutron-rich heavy nuclei in the 238U+124Sn multinucleon transfer reaction

In this experiment we intend to measure the 238U+124Sn multinucleon transfer reaction by using the PRISMA + NOSE + AGATAset-up to study the details of the A, Z, Q-value distributions and associated gamma rays. In addition, we will employ a high resolution kinematic coincidence to extract the light-heavy mass-mass correlation and the transfer induced fission probability of the heavy partner. By a cross comparison of these informations we will be able to define at best the yields of heavy partners. The results will provide precious inputs for a variety of experimental and theoretical studies whose developments require knowledge of the population yields of nuclear species produced via transfer mechanism that differ by a substantial amount of protons and neutrons from 238U

Speaker: Lorenzo Corradi (Istituto Nazionale di Fisica Nucleare)

PrePACJuly2025_short.pdf

uranium_NEW.pdf

16:20 Pushing the limits of γ-ray spectroscopy of neutron-rich fission fragments with AGATA–PRISMA coupling

In this Letter of Intent, we aim to study the structure of neutron-rich nuclei in the region of 78Ni. The main focus is to investigate states resulting from the coupling between excited states of the inert core and valence protons in the N=50 nuclei 79Cu and 80Zn. In addition, the proposed experiment will provide a systematic and relevant dataset on excited states in this region of the nuclear chart, extending the neutron-rich frontier by approximately two neutrons per atomic number compared to what has been achieved in previous studies with similar setup. The nuclei of interest will be produced via transfer- and fusion-induced fission reactions in inverse kinematics. The PRISMA spectrometer will be used to isotopically identify fission fragments, and the AGATA gamma tracking array will measure prompt γ rays.

Speaker: Jérémie Dudouet (IP2I)

LOI_FISSION_LNL.pdf

16:40 Lifetimes of excited states along and around the N=50 shell closure

The LoI content is attached ad PDF

Speaker: Andrea Gottardo (Istituto Nazionale di Fisica Nucleare)

gottardo_LoI_fission_lifetimes.pdf

LoI-Ufission-lifetimes_2.pdf

17:00 Multiple Shape Coexistence in 78Se

Through this letter of intent, we propose to investigate the electromagnetic properties of the low-lying states in $^{78}$Se, which is a promising candidate for the observation of multiple shape coexistence. This measurement will be done via a multi-step Coulomb excitation measurement with AGATA in conjunction with the particle detectors SPIDER and DANTE. The primary objective is to measure, with suitable accuracy, the diagonal and transition E2 matrix elements connecting the low-lying states. These matrix elements will be used to determine shape parameters on the basis of a rotational-invariant sum-rule analysis, thereby, providing considerable insight into the underlying collectivity and the inherent triaxial nature of the ground-state, gamma bands, and the other lower-lying excited $0^+$ states. These newly determined shape parameters will shed light on the possible multiple shape coexistence phenomenon in the $^{78}$Se nucleus. Four (4) days of beam on target are requested.

Speaker: Nirupama Sensharma

multiple_shape_coexistence_78Se.pdf

17:20 Multiple-shape coexistence in $^{120}$Sn

We propose to investigate the phenomenon of multiple-shape coexistence in the $Z\approx50$ region by performing a multi-step Coulomb-excitation measurement of $^{120}$Sn using the AGATA+SPIDER setup.
The aim of the experiment is the measurement of the electromagnetic properties of the low-lying states in $^{120}$Sn, in particular the spectroscopic quadrupole moments of the $2_{1,2,3}^+$ excited states.
Such results will allow us to determine the quadrupole-deformation parameters $(\beta_2, \gamma)$ of the $0_{1,2}^+$ states, as well as the deformation strength of $0_3^+$ headband.
The outcome of the measurement will allow us to shed light on the phenomenon of shape coexistence in the neutron-rich $Z\approx50$ region, providing demanding test for state-of-the-art theoretical models which propose contradicting interpretation of the shape evolution for the Sn isotopic chain.

Speaker: Tongan Wu

LNL_prePAC_120Sn_CoulEx.pdf

LoI-LNL_Coulex_120Sn.pdf

17:40 Investigation of the rotational band in $^{120}$Sn

We propose to search for the intruder band that builds on the deformed excited $0^+$ states in $^{120}$Sn using fusion-evaporation. While our recent $(n,\gamma)$ measurement showed that the low-lying excited $0^+_{2,3}$ states in $^{120}$Sn are deformed, the expected rotational band which builds on the deformed $0^+$ states have not yet been observed. The aim of this complementary fusion-evaporation experiment is to identify and place the high-spin members of the intruder band, exploiting the high sensitivity of the AGATA+SAURON setup. Observation of the band structure will unveil the underlying deformation and elucidate whether the intruder band is rotational, vibrational, or a mixture of both. Combined with the systematics of the other Sn isotopes, our results will contribute to improve the understanding of shell evolution in the semimagic chain.

Speaker: Tongan Wu

LNL_prePAC_120Sn_Fusion_Evap.pdf

LoI-LNL_Fus_Evap_120Sn.pdf

18:00 Electric Dipole Transitions in mirror nuclei

The mirror nuclei with mass 19 offer a unique opportunity to address such study on the violation of isospin symmetry because it is the only case where a 1/2- to 1/2+, having a pure E1 transition. This is a unique opportunity of testing isospin mixing with high precision because in this case mixing with E2 transition is not possible. Only one measurement was performed of this E1 transition. We propose to obtain a second more precise measurement.

Speaker: Francesco Recchia (Istituto Nazionale di Fisica Nucleare)

AGATA_19Ne.pdf

Recchia_LOI_19Ne_01.pdf

20:30 → 23:00 Social Dinner

Friday 11 July

09:00 → 11:00 Session 2

Convener: Andrea Gottardo (Istituto Nazionale di Fisica Nucleare)

09:00 Investigating Structures in 124Te via Coulomb Excitation

We propose to perform Coulomb excitation using a $^{58}$Ni beam on a $^{124}$Te target using the combination of the AGATA and SPIDER detector arrays. Sufficient yields of $\gamma$ rays will be obtained that will enable us to meet the following goals:
- Determine the spectroscopic quadrupole moments of the 2$^+_1$, 2$^+_2$, and 4$^+_1$ states;
- Determine the matrix elements for the 4$^+_2 \to 4^+_1$, 4$^+_2 \to 2^+_2$, 0$^+_3 \to 2^+_2$, and perhaps the 0$^+_4 \to 2^+_2$ transitions;
- Determine the $\langle \cos 3\delta\rangle$ value for the 0$^+_1$ state;
- Determine the $\langle Q^2 \rangle$ value for the 0$^+_2$ state.

Speaker: Andrew STUCHBERY (The Australian National University)

Coulex_124Te_LNL-2.pdf

09:20 Study of 11/2- isomer in neutron-rich N = 126 nucleus 203Ir

see attached pdf

Speaker: Gaolong Zhang (Beihang University)

TemplateProposalBody20250630.pdf

09:40 Evolution of the Octupole collectivity in 152Gd

The observation in the Lanthanides of low-lying states in nuclei with even Z, N having total angular momentum and parity I$^{\pi}$=3$^-$ is indicative of their undergoing octupole vibrations about a reflection-symmetric shape. Further evidence is provided by the sizeable value of the electric octupole (E3) moment for the transition to the ground state, indicating collective behaviour of the nucleons. Recently, the systematics of the E3 strength across the Gd isotopic chain has been studied and the results reveal that enhanced octupole collectivity is obtained for 150Gd. The energy of 3$^-$ state in 152Gd is similar with 150Gd. However, the B(E3) value is missing for 152Gd. The proposal is to achieve the direct determination of the octupole collectivity in 152Gd by a Coulomb excitation measurement.

Speaker: Fanfei Zeng (Istituto Nazionale di Fisica Nucleare)

Evolution_of_Octupole_collectivity_in_152Gd.pdf

10:00 Using Coulomb excitation to study the low-lying structure of 104Pd

Please find in the attachment section the abstract and the body of the LoI.

Speaker: Naomi Marchini (Istituto Nazionale di Fisica Nucleare)

104Pd_coulex-abstract.pdf

104Pd_coulex.pdf

presentation-104Pd-PrePAC.pdf

10:20 Shapes and collectivity near magic nuclei: Coulomb excitation of 62Ni

ABSTRACT:

In the proposed experiment, we plan to investigate the properties of nuclei close to the doubly-magic $^{56}$Ni isotope (N = Z = 28) using the Coulomb-excitation method.
Specifically, we propose to study the electromagnetic structure of $^{62}$Ni with the AGATA spectrometer coupled to the SPIDER (+DANTE) heavy-ion detector.

The results of the proposed experiment, along with those from the $^{58,60}$Ni Coulomb-excitation experiments already performed at IJC Lab (Orsay, France) and INFN LNL (Legnaro, Italy) with the Nuball2+DSSD, GALILEO+SPIDER, and AGATA+SPIDER setups, will allow us to bring a crucial experimental input to investigate fundamental aspects of the structure of doubly-magic nuclei and in their vicinity. In particular, with the new Coulomb-excitation data set we will provide further inputs to discuss some open questions, such as:

1. Are nuclei nearby doubly-magic isotopes spherical in their ground
   states?
2. What is the reason for the emergence of collectivity close to shell closures?
3. What is the potential role of triaxiality in forming deformed shapes in these regions? How “good” is the 28 magic number?

The full text of the presented LoI is attached in a separate PDF file.

Speaker: Katarzyna Hadynska-Klek (University of Warsaw)

62Ni_COULEX_LNL-2.pdf

10:40 Exploiting two-proton transfer reactions for probing shape coexistence

The regions of the nuclear chart displaying a rapid change of the collectivity with respect to the proton or neutron number, are of a particular interest for testing nuclear models [1]. Such kind of behaviour has been noticed along the iron isotopic chain as moving from the stable towards the N=50 shell closure. Theoretical calculations performed with the LNPS interaction which was developed to study the Fe isotopes predicts an island of inversion around the N=40 with strong quadrupole correlations in Fe for N≥30 [2]. Similar conclusions were drawn also by the shell model employing pairing and multipole interaction [3]. Therefore Fe isotopes with N≥28 are a good testing ground for rapid shape evolution from a spherical to a well deformed region close to N=40.

Two proton transfer reactions employing 14C and 18O beams have been used in the past for performing spectroscopy of several elements such as: 34Si, 44Ti, 62Fe, 68Ni [4-6].
We aim to use a 18O beam with 63 MeV on a target of 64Ni to populate excited states in 62Fe and perform lifetime measurements via RDDS/DSAM techniques employing the AGATA array coupled to the Sauron silicon detector. Based on Fresco calculations the cross section for the 0$^+_2$ and $2^+_2$ states in 62Fe are peaked at the forward angles [7]. Lifetime measurements of the 0$^+_2$ and 2$^+_2$ states could be used to benchmark the structure of 62Fe nucleus and could help to predict features at more neutron rich isotopes, towards the N=40 island of inversion.

[1] M. Klintefjord et al., Phys. Rev. C 95, 024312 (2017)
[2] S. M. Lenzi, F. Nowacki, A. Poves, and K. Sieja, Phys. Rev. C 82, 054301 (2010)
[3] K. Kaneko, T. Otsuka, B. A. Brown, and T. Mizusaki, Phys. Rev. C 78, 064312
[4] M. Bernas et al., Physical Review C, 24 (1981) 2
[5] R. H. Siemssen et at., Physical Review Letters, 28 (1972) 10
[6] Z. Phys. A - Atoms and Nuclei 319, 287-293 (1984)
[7] N. Keeley - Private communication

Speaker: Julgen Pellumaj (Istituto Nazionale di Fisica Nucleare)

62Fe_LoI.pdf

11:00 → 11:30 Coffee Break

11:30 → 12:50 Session 3

Convener: Dr Simone Bottoni (Università degli Studi di Milano and INFN)

11:30 Search for Octupole Correlations in Odd-Mass Radium and Radon Isotopes

Higher order collective degrees of freedom are well-established in the composition of excited quantum states of the atomic nucleus. Octupole collectivity, associated with pear-shaped nuclei, has been the subject of intense theoretical and experimental study. Regions of octupole deformation are found above all the major shell gaps --- the so-called octupole magic numbers --- $Z,N = 34, 56, 88, 134$. Effects attributed to octupole collectivity are particularly prominent in the light-actinide region, confirmed by numerous studies on even-even isotopes of the U, Th, Ra, Rn, isotopic chains. However, experimental information on odd-mass isotopes in this mass region are sorely lacking. The odd-mass candidates are of particular interest due to the enhancement of octupole effects arising from the interaction of the unpaired nucleon with the deformed core. These systems also play a central role in atomic electric dipole moment (EDM) searches, where the static octupole deformation and presence of low-lying parity doublets significantly enhance the nuclear Schiff moment. We request 7 days of beam time bombarding a 2 mg/cm$^2$ $^{232}$Th target with an 833 MeV $^{136}$Xe beam, with the objective of populating odd-mass radon and radium isotopes via multinucleon transfer reactions. A particular focus is placed on $^{223}$Rn which is expected to exhibit a higher degree of octupole collectivity compared to its neighbours. Measurements of experimental observables easily derived from energy level schemes $(\Delta i_x, ~|D_0/Q_0|)$ will provide immediate insight into the strength and type of octupole collectivity in these nuclei. The precise atomic mass and charge selectivity offered by PRISMA is expected to overcome previous experimental shortcomings in being unable to identify $\gamma$ rays belonging to the odd mass candidates.

Speaker: Conor Michael Sullivan

Ra_Rn_MNT_v2-2.pdf

11:50 Study of exotic neutron-deficient nuclei close to 100Sn using novel multinucleon transfer reactions

The Letter of Intent is given as an attachment. The abstract is copied below.

Abstract
Multinucleon transfer reactions are known to provide a useful method of populating neutron-rich nuclei in gamma-ray spectroscopy experiments. Recent theoretical calculations have suggested that such reactions could also be used to produce neutron-deficient nuclei, but this has not been properly investigated in experiments. The calculations suggest that it may be possible to produce the neutron-deficient nuclei from (50^)Sn to (_54^)Xe with reasonable cross sections. These nuclei are of considerable interest due to their proximity to N=Z (^100)Sn. In the experiment we will also study the production yields of neutron-deficient nuclei above (_50^100)Sn with multinucleon transfer reactions. We will use a beam of (_50^112)Sn at 650 MeV on a thin (_28^56)Ni target. The beam-like reaction products will be identified using the PRISMA spectrometer, and the prompt decays of excited states will be measured using AGATA. To perform this measurement, we request 14 days of beam time.

Speakers: Dr James Keatings (University of the West of Scotland), John Francis Smith

AGATA_LetterOfIntent_Keatings_June2025.pdf

12:10 Lifetime measurements toward the N = 20 Island of Inversion

Far from the valley of stability, proton-neutron correlations may lead to a lowering of intruder states and, concurrently, to the onset of deformed configurations at low excitation energies, outlining the so-called Islands of Inversion. Among them, the Island of Inversion located at the N = 20 shell gap has recently become the subject of many theoretical and experimental works. The former, based on different approaches (including the latest ab initio calculations), show contradictory results on anticipating the exact location of the Island and on predicting shell and shape evolution towards it, especially for Ne and Mg isotopes. To validate these models and better understand the transition of these light isotopes into the Island of Inversion, an experimental campaign with the AGATA-PRISMA setup was started at LNL using multi-nucleon transfer reactions induced by`$^{22}$Ne and $^{26}$Mg beams on $^{238}$U target. While the first was devoted to spectroscopy, the second aimed at lifetime measurements with the DSAM technique.
Given the high quality of $^{22}$Ne + $^{238}$U data and considering that a larger number of excited states in Ne isotopes was observed, compared to the Mg-induced run, we propose the same $^{22}$Ne-induced reaction and the AGATA-PRISMA setup, focused this time on lifetime measurements with the DSAM technique. The proposed experiment will rely on the expertise we gained during the previous runs to optimize the PRISMA spectrometer for light ions detection in conjunction with the newly developed analysis procedure to recover PRISMA inefficiencies.
We primarily aim at studying excited states of $^{23,24,25}$Ne isotopes along with $^{19-22}$O and the proton-odd $^{23}$F and $^{25}$Na, which will also be populated with reasonable statistics by the same reaction. The setup configuration is proposed to be the same as the previous Ne experiment, requesting a $^{22}$Ne beam at 160 MeV of total energy, impinging on a 1 mg/cm$^2$ $^{238}$U target, tilted by 54° with respect to PRISMA entrance. An 8 mg/cm$^2$ Nb backing will act as a degrader to get access to tens-to-hundreds femtoseconds lifetimes of excited states.
To conclude the measurement and achieve our goals, we request 6 days of beamtime.

Speaker: Davide Genna (Istituto Nazionale di Fisica Nucleare)

22Ne_LNL.pdf

12:30 Intruder configurations toward the Island of Inversion at N = 20

We propose a new experiment at LNL using the AGATA+PRISMA setup to investigate the structure of neutron-rich magnesium isotopes near the N=20 Island of Inversion. Using a $^{30}\mathrm{Si}$ beam on a $^{238}\mathrm{U}$ target, we aim to populate $^{30}\mathrm{Mg}$ and neighboring nuclei via multinucleon transfer reactions and measure level lifetimes using the Doppler Shift Attenuation Method (DSAM). The experiment focuses on the evolution of intruder configurations and configuration mixing in even-even and odd-A systems, particularly probing the nature of the $2_2^+$ state in $^{30}\mathrm{Mg}$ and negative-parity states in $^{29}\mathrm{Mg}$. Lifetimes, transition strengths, and spectroscopic information will provide key constraints on shell-model and ab initio calculations, and clarify the onset of collectivity and shape coexistence in this critical region. The results will contribute to a more systematic understanding of structure evolution across isotopic chains approaching the Island of Inversion.

Speaker: Pablo Antonio Aguilera Jorquera

250611___Proposal_LNL_30Mg.pdf

250611___Proposal_LNL_30Mg_abstract.pdf

12:50 → 14:10 Lunch

14:10 → 15:10 Session 4

Convener: Daniele Mengoni (Istituto Nazionale di Fisica Nucleare)

14:10 LIfetime meaSurement with AGATA for AstrophysiCs - 21Na (ISAAC-21)

To assess the Universe chemical evolution a crucial ingredient is the cross section of nuclear reactions taking place in stars. Given its low value, pico- to femto-barn, at astrophysical energies, that prevents direct measurements and we still have to rely on extrapolation. The contribution of narrow or of large sub-threshold resonances, which may dominate the reaction rate, cannot be, however, accounted for by the extrapolation. In this scenario, accessing to low energy and sub-threshold resonance lifetime is of paramount importance to constrain the extrapolation and parameterize their contribution to the cross section at the energies of interest.
The proposed measurement aims to measure the lifetime of a subthreshold resonance, at $E$\textsubscript{r}$\,=\,-6.7$~keV, of the $^{20}$Ne(p,$\gamma$)$^{21}$Na reaction, which has a key role in AGB star nucleosynthesis of isotopes up to A = 40. The corresponding excited level in $^{21}$Na, $E$\textsubscript{x}$\,=\,$2424~keV (J$^{\pi}$ = 1/2$^{+}$), will be populate via the $^{21}$Ne(p,n)$^{21}$Na channel in inverse kinematic. The 40~nm thick H implanted target will be irradiated by $^{21}$Ne beam, with E=8 AMeV and $I$\textsubscript{b}$\,=\,$2~pnA.
Two substrates will be used for the implanted target: Si and Au, allowing, together with AGATA detection system, to exploit DSAM technique with high sensitivity and independent from simulations.

Speaker: Jaime Benito Garcia (INFN-LNL)

ISAAC_21_LOI.pdf

14:30 Lifetime measurements in the Neutron-Rich Ge Isotopes Near the $N=50$ Closed Shell.

B. Gongora,$^{1}$ P.~Aguilera,$^1$ G.~Andreetta,$^2$ F.~Angelini,$^2$ M.~Balogh,$^2$ J.~Benito,$^2$ G.~Benzoni,$^3$ S.~Bottoni,$^3$ D.~Brugnara,$^{4}$ G.~de Angelis,$^2$ S.~Carollo,$^1$ G.~Corbari,$^3$ A.~Ertoprak,$^{5}$ R.~Escudeiro,$^{6}$ C.~Fransen,$^{7}$ A.~Gadea,$^8$ F.~Galtarossa,$^1$ D.~Genna,$^3$ A.~Giaz,$^3$ A.~Goasduff,$^1$ A.~Gottardo,$^1$ J.~Ha,$^{1}$ S.M.~Lenzi,$^1$ A.~Illana,$^9$ R.~Illicachi,$^8$ J.~Ljungvall,$^{10}$ M.~Luciani,$^3$ T.~Marchi,$^2$ N.~Marchini,$^11$ R.~Menegazzo,$^1$ D.~Mengoni,$^1$ T.~Mijatovic,$^{12}$ B.~Million,$^3$ G.~Montagnoli,$^1$ D.R.~Napoli,$^2$ R.~Nicol\'as del \'Alamo,$^1$ J.~Pellumaj,$^2$ R.M.~P\'erez-Vidal,$^8$ S.~Pigliapoco,$^1$ E.~Pilotto,$^1$ M.~Polettini,$^4$ F.~Recchia,$^1$ K.~Rezynkina$^1$ M.~Rocchini,$^{10}$ M.~Sedl\'ak,$^2$ D.~Stramaccioni,$^4$ J.J.~Valiente Dob\'on,$^8$ I.~Zanon,$^{6}$ L.~Zago,$^{2,3}$ G.~Zhang,$^{13}$, and F.~Zeng,$^2$

$^{1}$ Dipartimento di Fisica and INFN, Sezione di Padova, Padova, Italy
$^{2}$ INFN, Laboratori Nazionali di Legnaro, Legnaro, Italy
$^{3}$ Dipartimento di Fisica and INFN, Sezione di Milano, Milano, Italy
$^{4}$ GSI Helmholtzzentrum f\"ur Schwerionenforschung, Germany
$^{5}$ Argonne National Laboratory, Argonne (IL), USA
$^{6}$ Stockholm University, Sweden
$^{7}$ Institute for Nuclear Physics University of Cologne, Germany
$^{8}$ IFIC, CSIC-University of Valencia, Spain
$^{9}$ Grupo de F\'isica Nuclear IPARCOS, Universidad Complutense de Madrid, Spain
$^{10}$ IJCLab, IN2P3/CNRS, Universit\'e Paris-Saclay, Orsay, France
$^{11}$ INFN Sezione di Firenze, Firenze, Italy
$^{12}$ Ruder Bo\v skov\'ic Institute, Zagreb
$^{13}$ Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University, China

In the frame of shape evolution, Ge isotopes represent a challenge due to the rapid change in the shape configuration in terms of the neutron number. A triaxial configuration has been observed in the even-A $^{74-78}$Ge isotopes \cite{ref:1,ref:2,ref:3,ref:4,ref:5}. In the region of the isotopes $^{80-84}$Ge, a peculiar phenomenon is predicted by beyond-mean-field calculations \cite{ref:6}, a spherical configuration for the magic $N = 50$ and a rapid onset to prolate deformation in $^{80}$Ge, as well as in $^{84}$Ge. Three experiments were performed to determine the $B(E2;0^{+}_1 \rightarrow 2^{+}_1)$ in $^{80}$Ge \cite{ref:7,ref:8,ref:9}, with values that differ up to for a 66\%, and the study of the spectroscopy quadrupole moment $Q_{s}(2^{+}_{1})$ performed at ReA3 \cite{ref:9} was not conclusive, since the error estimation of the measurement did not allow discriminating among different theoretical approximations (jj44b, JUN45, 5DCH, and Symmetric Rotor).

In the present letter of intention, we propose to perform lifetime measurements for the first time of the 4$^+_1$, 2$^+_2$, and 2$^+_1$ states in $^{80}$Ge using the Recoil Distance Doppler Shift (RDDS) technique to study the deformation. The population of the states of interest will be achieved via the multinucleon transfer reaction $^{82}$Se($^{18}$O,$^{20}$Ne)$^{80}$Ge, used in the past \cite{ref:10}. For this purpose, a tantalum oxide target will be irradiated with a $^{82}$Se beam. The particle identification will be performed using the PRISMA spectrometer. Due to the presence of the 8$^+$ isomer state (2.95 ns) and the expected lifetime of the 4$^{+}$ ($\lt$10 ps), RDDS technique after a multinucleon transfer reaction arises as one of the best options to carry out the study of the lifetime of the states of interest.

[1] J. J. Sun, et al., Phys. Lett. B 734, 308 (2014).
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Speaker: Benito Gongora Servin (Istituto Nazionale di Fisica Nucleare)

14:50 Lifetime measurements in n-rich Ni, Cu, and Zn Isotopes in the mid 𝝂g9/2 shell

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Speakers: Andrés Gadea (IFIC-CSIC-UV), Andrés Illana (UCM), Eda Sahin (Oslo University), Rosa Maria Perez Vidal

Ni-Cu-Zn.pdf

15:10 → 15:30 Closing remarks

Speakers: Dr Alain Goasduff (INFN Laboratori Nazionali di Legnaro), Magda Zielinska (CEA Saclay)