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High-Precision Spectroscopy of O20 Benchmarking Ab Initio Calculations in Light Nuclei
/ Zanon, I. (INFN, Legnaro ; Ferrara U.) ; Clément, E. (GANIL) ; Goasduff, A. (INFN, Legnaro) ; Menéndez, J. (ICC, Barcelona U.) ; Miyagi, T. (Darmstadt, Tech. U. ; Heidelberg, Max Planck Inst. ; Darmstadt, GSI) ; Assié, M. (IJCLab, Orsay) ; Ciemała, M. (Cracow, INP) ; Flavigny, F. (LPC, Caen) ; Lemasson, A. (GANIL) ; Matta, A. (LPC, Caen) et al.
The excited states of unstable $^{20}$O were investigated via $\gamma$-ray spectroscopy following the $^{19}$O$(d,p)^{20}$O reaction at 8 $A$MeV. By exploiting the Doppler Shift Attenuation Method, the lifetime of the 2$^+_2$ and 3$^+_1$ states were firmly established. [...]
arXiv:2405.14305.-
2023-12-28 - 7 p.
- Published in : Phys. Rev. Lett. 131 (2023) 262501
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2.
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Shape evolution in even-mass $^{98-104}$Zr isotopes via lifetime measurements using the $\gamma \gamma $-coincidence technique
/ Pasqualato, G. (IJCLab, Orsay) ; Ansari, S. (IRFU, Saclay) ; Heines, J.S. (Oslo U.) ; Modamio, V. (Oslo U.) ; Görgen, A. (Oslo U.) ; Korten, W. (IRFU, Saclay) ; Ljungvall, J. (IJCLab, Orsay ; Strasbourg, IPHC) ; Clément, E. (GANIL) ; Dudouet, J. (IP2I, Lyon) ; Lemasson, A. (GANIL) et al.
The Zirconium (Z = 40) isotopic chain has attracted interest for more than four decades. The abrupt lowering of the energy of the first $2^+$ state and the increase in the transition strength B(E2; $2_1^\rightarrow 0_1^+$ going from $^{98}$Zr to $^{100}$Zr has been the first example of "quantum phase transition" in nuclear shapes, which has few equivalents in the nuclear chart. [...]
arXiv:2410.17004.-
2023-11-21 - 13 p.
- Published in : Eur. Phys. J. A 59 (2023) 276
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3.
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Search for $^{22}$Na in novae supported by a novel method for measuring femtosecond nuclear lifetimes
/ Fougères, Chloé (GANIL ; Argonne, PHY) ; de Oliveira Santos, François (GANIL) ; José, Jordi (Barcelona U. ; Barcelona, IEEC) ; Michelagnoli, Caterina (Laue-Langevin Inst.) ; Clément, Emmanuel (GANIL) ; Kim, Yung Hee (GANIL ; IBS, Daejeon, CENS) ; Lemasson, Antoine (GANIL) ; Guimarães, Valdir (Sao Paulo U.) ; Barrientos, Diego (CERN) ; Bemmerer, Daniel (HZDR, Dresden) et al.
Classical novae are thermonuclear explosions in stellar binary systems, and important sources of $^{26}$Al and $^{22}$Na. While gamma rays from the decay of the former radioisotope have been observed throughout the Galaxy, $^{22}$Na remains untraceable. [...]
arXiv:2212.06302.-
2023-09-05 - 18 p.
- Published in : Nature Commun. 14 (2023) 4536
Fulltext: document - PDF; 2212.06302 - PDF;
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4.
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Evidence for spherical-oblate shape coexistence in $^{87}\mathrm{Tc}$
/ Liu, X (Stockholm, Res. Inst. Atomic Phys. ; Lanzhou, Inst. Modern Phys. ; Beijing, GUCAS) ; Cederwall, B (Stockholm, Res. Inst. Atomic Phys.) ; Qi, C (Stockholm, Res. Inst. Atomic Phys.) ; Wyss, R A (Stockholm, Res. Inst. Atomic Phys.) ; Aktas, Ö (Stockholm, Res. Inst. Atomic Phys.) ; Ertoprak, A (Stockholm, Res. Inst. Atomic Phys. ; Istanbul U.) ; Zhang, W (Stockholm, Res. Inst. Atomic Phys.) ; Clément, E (GANIL) ; de France, G (GANIL) ; Ralet, D (CSNSM, Orsay) et al.
Excited states in the neutron-deficient nucleus $^{87}$Tc have been studied via the fusion-evaporation reaction $^{54}$Fe($^{36}$Ar, 2$n$1p) $^{87}$Tc at 115 MeV beam energy. The AGATA γ -ray spectrometer coupled to the DIAMANT, NEDA, and Neutron Wall detector arrays for light-particle detection was used to measure the prompt coincidence of $\gamma$ rays and light particles. [...]
2022 - 6 p.
- Published in : Phys. Rev. C 106 (2022) 034304
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5.
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Evidence of Partial Seniority Conservation in the $\pi{g}_{9/2}$ Shell for the $N=50$ Isotones
/ Pérez-Vidal, R M (Valencia U., IFIC ; INFN, Legnaro) ; Gadea, A (Valencia U., IFIC) ; Domingo-Pardo, C (Valencia U., IFIC) ; Gargano, A (INFN, Naples ; Carlos III U., Madrid) ; Valiente-Dobón, J J (INFN, Legnaro) ; Clément, E (GANIL) ; Lemasson, A (GANIL) ; Coraggio, L (INFN, Naples ; Carlos III U., Madrid ; Napoli Seconda U.) ; Siciliano, M (Argonne, PHY) ; Szilner, S (Boskovic Inst., Zagreb) et al.
The reduced transition probabilities for the $4^+_1 \to 2^+_1$ and $2^+_1 \to 0^+_1$ transitions in $^{92}$Mo and $^{94}$Ru and for the $4^+_1 \to 2^+_1$ and $6^+_1 \to 4^+_1$ transitions in $^{90}$Zr have been determined in this experiment making use of a multinucleon transfer reaction. These results have been interpreted on the basis of realistic shell-model calculations in the $f_{5/2}, p_{3/2}, p_{1/2},$ and $g_{9/2}$ proton valence space. [...]
2022 - 7 p.
- Published in : Phys. Rev. Lett. 129 (2022) 112501
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6.
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Evidence for enhanced neutron-proton correlations from the level structure of the $N=Z+1$ nucleus $_{43}^{87}\mathrm{Tc}_{44}$
/ Liu, X. (Royal Inst. Tech., Stockholm ; Beijing, GUCAS ; Lanzhou, Inst. Modern Phys.) ; Cederwall, B. (Royal Inst. Tech., Stockholm) ; Qi, C. (Royal Inst. Tech., Stockholm) ; Wyss, R.A. (Royal Inst. Tech., Stockholm) ; Aktas, Ö. (Royal Inst. Tech., Stockholm) ; Ertoprak, A. (Royal Inst. Tech., Stockholm) ; Zhang, W. (Royal Inst. Tech., Stockholm) ; Clément, E. (GANIL) ; de France, G. (GANIL) ; Ralet, D. (CSNSM, Orsay) et al.
The low-lying excited states in the neutron-deficient $N=Z+1$ nucleus $^{87}_{43}$Tc$^{\ }_{44}$ have been studied via the fusion-evaporation reaction $^{54}$Fe($^{36}$Ar, $2n1p$)$^{87}$Tc at the Grand Accélérateur National d'Ions Lourds (GANIL), France. The AGATA spectrometer was used in conjunction with the auxiliary NEDA, Neutron Wall, and DIAMANT detector arrays to measure coincident prompt $\gamma$-rays, neutrons, and charged particles emitted in the reaction. [...]
arXiv:2109.06292.-
2021-08-20 - 5 p.
- Published in : Phys. Rev. C 104 (2021) L021302
Fulltext: PhysRevC.104.L021302 - PDF; 2109.06292 - PDF;
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7.
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Low-lying electric dipole $γ$-continuum for the unstable $^{62,64}$Fe nuclei: Strength evolution with neutron number
/ Avigo, R (INFN, Milan ; Milan U.) ; Wieland, O (INFN, Milan) ; Bracco, A (INFN, Milan ; Milan U.) ; Camera, F (INFN, Milan ; Milan U.) ; Ameil, F (Darmstadt, GSI) ; Arici, T (Darmstadt, GSI) ; Ataç, A (Royal Inst. Tech., Stockholm) ; Barrientos, D (CERN) ; Bazzacco, D (INFN, Padua) ; Bednarczyk, P (Cracow, INP) et al.
The γ -ray emission from the nuclei $^{62,64}$Fe following Coulomb excitation at bombarding energy of 400-440 AMeV was measured with special focus on E 1 transitions in the energy region 4-8 MeV. The unstable neutron-rich nuclei $^{62,64}$Fe were produced at the FAIR-GSI laboratories and selected with the FRS spectrometer. [...]
2020 - 6 p.
- Published in : Phys. Lett. B 811 (2020) 135951
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8.
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Isospin Properties of Nuclear Pair Correlations From the Level Structure of the Self-Conjugate Nucleus $^{88}$Ru
/ Cederwall, B (Royal Inst. Tech., Stockholm) ; Liu, X (Royal Inst. Tech., Stockholm) ; Aktas, Ö (Royal Inst. Tech., Stockholm) ; Ertoprak, A (Royal Inst. Tech., Stockholm ; Istanbul U.) ; Zhang, W (Royal Inst. Tech., Stockholm) ; Qi, C (Royal Inst. Tech., Stockholm) ; Clément, E (GANIL) ; de France, G (GANIL) ; Ralet, D (CSNSM, Orsay) ; Gadea, A (Valencia U., IFIC) et al.
The low-lying energy spectrum of the extremely neutron-deficient self-conjugate ($N$=Z) nuclide $^{88}_{44}$Ru$_{44}$ has been measured using the combination of the Advanced Gamma Tracking Array (AGATA) spectrometer, the NEDA and Neutron Wall neutron detector arrays, and the DIAMANT charged particle detector array. Excited states in $^{88}$Ru were populated via the $^{54}$Fe($^{36}$Ar,2n$γ$)$^{88}$Ru* fusion-evaporation reaction at the Grand Accélérateur National d’Ions Lourds (GANIL) accelerator complex. [...]
2020 - 6 p.
- Published in : Phys. Rev. Lett. 124 (2020) 062501
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9.
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Testing ab initio nuclear structure in neutron-rich nuclei: lifetime measurements of second 2$^+$ states in $^{16}$C and $^{20}$O
/ Ciemala, M. (Cracow, INP) ; Ziliani, S. (Milan U. ; INFN, Milan) ; Crespi, F.C.L. (Milan U. ; INFN, Milan) ; Leoni, S. (Milan U. ; INFN, Milan) ; Fornal, B. (Cracow, INP) ; Maj, A. (Cracow, INP) ; Bednarczyk, P. (Cracow, INP) ; Benzoni, G. (INFN, Milan) ; Bracco, A. (Milan U. ; INFN, Milan) ; Boiano, C. (INFN, Milan) et al.
To test the predictive power of ab initio nuclear structure theory, the lifetime of the second 2+ state in neutron-rich 20O, tau(2+_2 ) = 150(+80-30) fs, and an estimate for the lifetime of the second 2+ state in 16C have been obtained, for the first time. The results were achieved via a novel Monte Carlo technique that allowed us to measure nuclear state lifetimes in the tens-to-hundreds femtoseconds range, by analyzing the Doppler-shifted gamma-transition line shapes of products of low-energy transfer and deep-inelastic processes in the reaction 18O (7.0 MeV/u) + 181Ta. [...]
arXiv:2002.04814.-
2020-02-28 - 7 p.
- Published in : Phys. Rev. C 101 (2020) 021303
Fulltext: PDF; Published fulltext: PhysRevC.101.021303 - PDF; 0144fdb9ec521f98f02c56efc9fa40a9 - PDF;
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10.
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Lifetime measurements in $^{52,54}$Ti to study shell evolution toward $N=32$
/ AGATA Collaboration
Lifetimes of the excited states in the neutron-rich Ti52,54 nuclei, produced in a multinucleon-transfer reaction, were measured by employing the Cologne plunger device and the recoil-distance Doppler-shift method. The experiment was performed at the Grand Accélérateur National d'Ions Lourds facility by using the Advanced Gamma Tracking Array for the γ-ray detection, coupled to the large-acceptance variable mode spectrometer for an event-by-event particle identification. [...]
2019 - 12 p.
- Published in : Phys. Rev. C 100 (2019) 054317
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