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1.
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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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2.
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Normal and intruder configurations in $^{34}$Si populated in the $\beta^-$ decay of $^{34}$Mg and $^{34}$Al
/ IDS Collaboration
The structure of $^{34}$Si was studied through $\gamma$ spectroscopy separately in the $\beta^-$ decays of $^{34}$Mg and $^{34}$Al at the ISOLDE facility of CERN. Different configurations in $^{34}$Si were populated independently from the two recently identified $\beta$-decaying states in $^{34}$Al having spin-parity assignments $J^\pi = 4^-$ dominated by the normal configuration $\pi (d_{5/2})^{-1} \otimes \nu (f_{7/2})$ and $J^\pi = 1^+$ by the intruder configuration $\pi (d_{5/2})^{-1} \otimes \nu (d_{3/2})^{-1}(f_{7/2})^{2}$. [...]
arXiv:1908.11626.-
2019-09-12 - 11 p.
- Published in : Phys. Rev. C 100 (2019) 034306
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3.
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Effects of one valence proton on seniority and angular momentum of neutrons in neutron-rich $^{122-131}$Sb$_{51}$ isotopes
/ Biswas, S. (GANIL) ; Lemasson, A. (GANIL) ; Rejmund, M. (GANIL) ; Navin, A. (GANIL) ; Kim, Y.H. (GANIL) ; Michelagnoli, C. (GANIL) ; Stefan, I. (Orsay, IPN) ; Banik, R. (Calcutta, VECC ; HBNI, Mumbai) ; Bednarczyk, P. (Cracow, INP) ; Bhattacharya, S. (Calcutta, VECC ; HBNI, Mumbai) et al.
The neutron-rich $^{122-131}$Sb isotopes were produced as fission fragments in the reaction $^{9}$Be($^{238}$U,~f) with 6.2 MeV/u beam energy. An unique setup, consisting of AGATA, VAMOS++ and EXOGAM detectors, was used which enabled the prompt-delayed gamma-ray ($\gamma$) spectroscopy of fission fragments in the time range of 100 ns - 200 $\mu$s. [...]
arXiv:1906.01245.-
2019-06-03 - 21 p.
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4.
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Transfer reactions induced with $^{56}$Ni: shell gaps and np pairing
/ Georgiadou, A (Orsay, IPN ; U. Paris-Sud 11, Dept. Phys., Orsay ; Paris, IN2P3) ; Assié, M (Orsay, IPN ; Paris, IN2P3) ; Blumenfeld, Y ; Crom, B Le ; Guillot, J ; Flavigny, F ; Achouri, L ; Aouadi, M ; Bastin, B ; Benitez, A et al.
The structure of the unstable doubly magic nucleus $^{56}$Ni has been investigated by measuring one-and two-nucleon transfer reactions. The radioactive beam of $^{56}$Ni was produced at GANIL-Caen, France at 30 MeV/u by means of the LISE spectrometer. [...]
Geneva : CERN, 2019 - 6 p.
- Published in : CERN Proc. (2019) , pp. 95-100
Fulltext: PDF;
In : 15th International Conference on Nuclear Reaction Mechanisms, Varenna, Italy, 11 - 15 Jun 2018, pp.95-100
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5.
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Pseudospin Symmetry and Microscopic Origin of Shape Coexistence in the $^{78}$Ni Region: A Hint from Lifetime Measurements
/ Delafosse, C (Orsay, IPN) ; Verney, D (Orsay, IPN) ; Marević, P (Orsay, IPN ; CEA DAM) ; Gottardo, A (Orsay, IPN) ; Michelagnoli, C (GANIL) ; Lemasson, A (GANIL) ; Goasduff, A (INFN, Legnaro) ; Ljungvall, J (CSNSM, Orsay) ; Clément, E (GANIL) ; Korichi, A (CSNSM, Orsay) et al.
Lifetime measurements of excited states of the light $N=52$ isotones $^{88}$Kr, $^{86}$Se, and $^{84}$Ge have been performed, using the recoil distance Doppler shift method and VAMOS and AGATA spectrometers for particle identification and gamma spectroscopy, respectively. The reduced electric quadrupole transition probabilities $B(E2;2^+ \rightarrow 0^+)$ and $B(E2;4^+ \rightarrow 2^+)$ were obtained for the first time for the hard-to-reach $^{84}$Ge. [...]
2018 - 7 p.
- Published in : Phys. Rev. Lett. 121 (2018) 192502
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6.
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Pygmy Gamow-Teller resonance in the N=50 region: New evidence from staggering of β -delayed neutron-emission probabilities
/ Verney, D (Orsay, IPN) ; Testov, D (Orsay, IPN ; Dubna, JINR) ; Ibrahim, F (Orsay, IPN) ; Penionzhkevich, Yu (Dubna, JINR ; Moscow Phys. Eng. Inst.) ; Roussière, B (Orsay, IPN) ; Smirnov, V (Dubna, JINR) ; Didierjean, F (Strasbourg, IPHC) ; Flanagan, K (U. Manchester) ; Franchoo, S (Orsay, IPN) ; Kuznetsova, E (Dubna, JINR) et al.
We report on the β-delayed neutron emission probability (P1n) measurements of the Ga82,83,84 (N=51,52,53) precursors performed in one single experiment using the He3 neutron-counter TETRA at the ALTO facility in Orsay. Altogether our results for the three A=82,83, and 84 Ga precursors point towards a sizable P1n staggering in the N=50 region, similar to the one already observed just after the N=28 shell closure in the K isotopes chain, hinting at a similar mechanism. [...]
2017 - 14 p.
- Published in : Phys. Rev. C 95 (2017) 054320
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7.
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The $^3$He long-counter TETRA at the ALTO ISOL facility
/ Testov, D (Orsay, IPN ; Dubna, JINR) ; Verney, D (Orsay, IPN) ; Roussière, B (Orsay, IPN) ; Bettane, J (Orsay, IPN) ; Didierjean, F (Strasbourg, IPHC) ; Flanagan, K (Manchester U.) ; Franchoo, S (Orsay, IPN) ; Ibrahim, F (Orsay, IPN) ; Kuznetsova, E (Orsay, IPN) ; Li, R (Orsay, IPN) et al.
A new β-decay station (BEDO) has been installed behind the PARRNe mass separator operated on-line at the electron-driven ALTO ISOL facility. The station is equipped with a movable tape collector allowing the creation of the radioactive sources of interest at the very center of a modular detection system. [...]
2016 - 8 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 815 (2016) 96-103
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8.
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Measurement of lifetimes in $^{62,64}$Fe,$^{61,63}$Co , and $^{59}$Mn
/ Klintefjord, M (Oslo U.) ; Ljungvall, J (CSNSM, Orsay) ; Görgen, A (Oslo U.) ; Lenzi, S M (INFN, Padua ; Padua U.) ; Bello Garrote, F L (Oslo U) ; Blazhev, A (Cologne U.) ; Clément, E (GANIL) ; de France, G (GANIL) ; Delaroche, J P (CEA DAM) ; Désesquelles, P (CSNSM, Orsay) et al.
Lifetimes of the 41+ states in 62,64Fe and the 11/21− states in 61,63Co and 59Mn were measured at the Grand Accélérateur National d'Ions Lourds (GANIL) facility by using the Advanced Gamma Tracking Array (AGATA) and the large-acceptance variable mode spectrometer (VAMOS++). The states were populated through multinucleon transfer reactions with a U238 beam impinging on a Ni64 target, and lifetimes in the picosecond range were measured by using the recoil distance Doppler shift method. [...]
2017 - 11 p.
- Published in : Phys. Rev. C 95 (2017) 024312
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9.
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Properties of low-lying intruder states in 34Aland 34Sipopulated in the beta-decay of 34Mg
/ Lică, R (CERN) ; Rotaru, F ; Negoită, F ; Grévy, S ; Mărginean, N ; Desagne, Ph ; Stora, T (CERN) ; Borcea, C ; Borcea, R ; Călinescu, S et al.
The results of the IS530 experiment at ISOLDE revealed new information concerning several nuclei close to the N ≈ 20 'Island of Inversion' - 34Mg, 34Al, 34Si. The half-life of 34Mgwas found to be three times larger than the adopted value (63(1) ms instead of 20(10) ms). [...]
2015 - 4 p.
- Published in : AIP Conf. Proc. 1645 (2015) 363-366
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10.
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Magnetism of an Excited Self-Conjugate Nucleus: Precise Measurement of the g Factor of the 21+ State in Mg24
/ Kusoglu, A ; Stuchbery, A E ; Georgiev, G ; Brown, B A ; Goasduff, A ; Atanasova, L ; Balabanski, D L ; Bostan, M ; Danchev, M ; Detistov, P et al.
A precise measurement of the g factor of the first-excited state in the self-conjugate (N=Z) nucleus Mg24 is performed by a new time-differential recoil-in-vacuum method based on the hyperfine field of hydrogenlike ions. Theory predicts that the g factors of such states, in which protons and neutrons occupy the same orbits, should depart from 0.5 by a few percent due to configuration mixing and meson-exchange effects. [...]
2015 - 5 p.
- Published in : Phys. Rev. Lett. 114 (2015) 062501
APS Open Access article: PDF; Fulltext: PDF;
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