Publications (61)
Early onset of ground-state deformation in the neutron-deficient polonium isotopes
T. E. Cocolios, W. Dexters, M. D. Seliverstov +28
In-source resonant ionization laser spectroscopy of the even- polonium isotopes Po has been performed using the to ($λ=843…
Normal and intruder configurations in Si populated in the $β^-$ decay of Mg and Al
R. Lica, F. Rotaru, M. J. G. Borge +53
The structure of Si was studied through spectroscopy separately in the $β^-$ decays of Mg and Al at the ISOLDE facility of CERN. Different configurations…
Ni revealed as a doubly magic stronghold against nuclear deformation
R. Taniuchi, C. Santamaria, P. Doornenbal +68
Nuclear magic numbers, which emerge from the strong nuclear force based on quantum chromodynamics, correspond to fully occupied energy shells of protons, or neutrons inside atomic…
Coulomb excitation of Ni at safe energies
N. Bree, I. Stefanescu, P. A. Butler +29
The value in Ni has been measured using Coulomb excitation at safe energies. The Ni radioactive beam was post-accelerated at the ISOLDE facility (CE…
Probing exotic cross-shell interactions at N=28 with single-neutron transfer on 47K
C. J. Paxman, A. Matta, W. N. Catford +76
We present the first measurement of the K()K transfer reaction, performed in inverse kinematics using a reaccelerated beam of K. The level scheme of $^{…
Pinning down electron correlations in RaF via spectroscopy of excited states and high-accuracy relativistic quantum chemistry
M. Athanasakis-Kaklamanakis, S. G. Wilkins, L. V. Skripnikov +53
We report the spectroscopy of the 14 lowest excited electronic states in the radioactive molecule radium monofluoride (RaF). The observed excitation energies are compared with full…
Evidence for a beta-decaying 1/2- isomer in 71Ni
I. Stefanescu, D. Pauwels, N. Bree +10
We report on the investigation of the population mechanism for the 454-KeV level in 71Cu. This level was identified for the first time in a recent Coulomb excitation measurement wi…
Radiative lifetime of the A 2Î 1/2 state in RaF with relevance to laser cooling
M. Athanasakis-Kaklamanakis, S. G. Wilkins, P. Lassègues +38
The radiative lifetime of the (v=0) state in radium monofluoride (RaF) is measured to be 35(1) ns. The lifetime of this state and the related decay rate $Î= 2.86…
Re-examining the transition into the N=20 island of inversion: structure of Mg
B. Fernández-DomÃnguez, B. Pietras, W. N. Catford +34
Intermediate energy single-neutron removal from Mg has been employed to investigate the transition into the N=20 island of inversion. Levels up to 5~MeV excitation energy in…
Level Structures of Ca Cast Doubt on a doubly magic Ca
S. Chen, F. Browne, P. Doornenbal +80
Gamma decays were observed in Ca and Ca following quasi-free one-proton knockout reactions from Sc beams at MeV/nucleon. For Ca, a …
An experimental setup for the study of gas-cell processes for the S-Low Energy Branch
E. Morin, W. Dong, V. Manea +17
We present an experimental setup dedicated to the study of in-gas ion processes and characterization of gas stopping cells for the Low Energy Branch of the Super Separator Spectrom…
Observation of the distribution of nuclear magnetization in a molecule
S. G. Wilkins, S. M. Udrescu, M. Athanasakis-Kaklamanakis +33
Rapid progress in the experimental control and interrogation of molecules, combined with developments in precise calculations of their structure, are enabling new opportunities in…
Sub-threshold states in Ne relevant to F(p,)O
J. E. Riley, A. M. Laird, N. de Séréville +24
Classical novae result from thermonuclear explosions producing several -ray emitters which are prime targets for satellites observing in the MeV range. The early 511 keV gamma-…
Validation of the Ground-State Molecular Structure Using Triple Differential Reaction Cross-Section Measurements
P. J. Li, D. Beaumel, J. Lee +58
The cluster structure of the neutron-rich isotope Be has been probed via the reaction at 150 MeV/nucleon in inverse kinematics and in quasifree conditions. The pop…
Evaluation of the K(,)Ca reaction rate using the Ca(,)Ca transfer reaction
L. Lalanne, O. Sorlin, M. Assié +28
A recent sensitivity study has shown that the KCa reaction is one of the ten reaction rates that could significantly impact the shape of the calculated…
First direct lifetime measurement of the 2+1 state in 72,74Zn: new evidence for shape transition between N = 40 and N = 42 close to Z = 28
M. Niikura, B. Mouginot, S. Franchoo +45
We report here the first direct lifetime measurement of the 2+1 state in 72,74Zn. The neutron-rich beam was produced by in-flight fragmentation of 76Ge at the Grand Accélérateur…
Spectroscopy of deeply bound orbitals in neutron-rich Ca isotopes
P. J. Li, J. Lee, P. Doornenbal +85
The calcium isotopes are an ideal system to investigate the evolution of shell structure and magic numbers. Although the properties of surface nucleons in calcium have been well st…
Investigation of the ground-state spin inversion in the neutron-rich 47,49Cl isotopes
B. D. Linh, A. Corsi, A. Gillibert +83
A first gamma-ray study of 47,49Cl spectroscopy was performed at the Radioactive Isotope Beam Factory with 50Ar projectiles at 217 MeV/nucleon, impinging on the liquid hydrogen tar…
Probing nuclear forces beyond the nuclear drip line: The cases of F and F
V. Girard-Alcindor, I. Stefan, F. de Oliveira Santos +53
The unbound proton-rich nuclei F and F are investigated experimentally and theoretically. Several experiments using the resonant elastic scattering method were perfor…
Isotope Shifts of Radium Monofluoride Molecules
S. M. Udrescu, A. J. Brinson, R. F. Garcia Ruiz +25
Isotope shifts of RaF were measured for different vibrational levels in the electronic transition . The observed iso…
Emergence of the N=16 shell gap in 21O
B. Fernandez-Dominguez, J. S. Thomas, W. N. Catford +39
The spectroscopy of 21O has been investigated using a radioactive 20O beam and the (d,p) reaction in inverse kinematics. The ground and first excited states have been determined to…
Charge radii of exotic potassium isotopes challenge nuclear theory and the magic character of
Ã. Koszorús, X. F. Yang, W. G. Jiang +26
Nuclear charge radii are sensitive probes of different aspects of the nucleon-nucleon interaction and the bulk properties of nuclear matter; thus, they provide a stringent test and…
Coulomb excitation of 73Ga
J. Diriken, I. Stefanescu, D. Balabanski +40
The B(E2; Ii -> If) values for transitions in 71Ga and 73Ga were deduced from a Coulomb excitation experiment at the safe energy of 2.95 MeV/nucleon using post-accelerated beams of…
Laser spectroscopy and CP-violation sensitivity of actinium monofluoride
M. Athanasakis-Kaklamanakis, M. Au, A. Kyuberis +39
The apparent invariance of the strong nuclear force under combined charge conjugation and parity (CP) remains an open question in modern physics. Precision experiments with heavy a…
Neutron-proton pairing in the N=Z radioactive fp-shell nuclei 56Ni and 52Fe probed by pair transfer
B. Le Crom, M. Assié, Y. Blumenfeld +49
The isovector and isoscalar components of neutron-proton pairing are investigated in the N=Z unstable nuclei of the \textit{fp}-shell through the two-nucleon transfer reaction (p,$…
Discovery of a new isomeric state in Ni: Evidence for a highly-deformed proton intruder state
A. Dijon, E. Clément, G. De France +26
We report on the observation of a new isomeric state in Ni. We suggest that the newly observed state at 168(1) keV above the first 2 state is a 0 state…
Direct transfer to K as a survey of the interaction
C. J. Paxman, A. Matta, W. N. Catford +76
The collapse of the canonical magic number in nuclei with has drawn significant interest as it relates to the emergence of an island of inversion centered on S…
shell closure below calcium: Low-lying structure of Ar
M. L. Cortés, W. Rodriguez, P. Doornenbal +78
Low-lying excited states in the isotope Ar were investigated by in-beam -ray spectroscopy following proton- and neutron-knockout, multi-nucleon removal, and proto…
Low-lying single-particle structure of 17C and the N = 14 sub-shell closure
X. Pereira-López, B. Fernández-DomÃnguez, F. Delaunay +58
The first investigation of the single-particle structure of the bound states of 17C, via the d(16C, p) transfer reaction, has been undertaken. The measured angular distributions co…
Narrow resonances in the continuum of the unbound nucleus F
V. Girard-Alcindor, A. Mercenne, I. Stefan +100
The structure of the unbound F nucleus is investigated using the inverse kinematics resonant scattering of a radioactive O beam impinging on a CH target. The anal…
beta-decay study of Cu-77
N. Patronis, H. De Witte, M. Gorska +21
A beta-decay study of Cu-77 has been performed at the ISOLDE mass separator with the aim to deduce its beta-decay properties and to obtain spectroscopic information on Zn-77. Neutr…
Science for Peace and the need for Civil Clauses at universities and civilian research institutions
J. Altmann, U. Amaldi, M. Barone +27
After the end of World War II, the commitment to confine scientific activities in universities and research institutions to peaceful and civilian purposes has entered, in the form…
Cross-shell states in C: a test for p-sd interactions
J. Lois-Fuentes, B. Fernández-DomÃnguez, X. Pereira-López +59
The low-lying structure of C has been investigated via the neutron-removal C reaction. Along with bound neutron sd-shell hole states, unbound p-shell hole stat…
In-gas-cell laser ionization spectroscopy in the vicinity of 100Sn: Magnetic moments and mean-square charge radii of N=50-54 Ag
R. Ferrer, N. Bree, T. E. Cocolios +15
In-gas-cell laser ionization spectroscopy studies on the neutron deficient 97-101Ag isotopes have been performed with the LISOL setup. Magnetic dipole moments and mean-square charg…
Measurement and microscopic description of odd-even staggering of charge radii of exotic copper isotopes
R. P. de Groote, J. Billowes, C. L. Binnersley +23
The mesoscopic nature of the atomic nucleus gives rise to a wide array of macroscopic and microscopic phenomena. The size of the nucleus is a window into this duality: while the ch…
In-beam spectroscopic studies of S nucleus
L. Caceres, D. Sohler, S. Grévy +36
The structure of the S nucleus has been studied at GANIL through the one proton knock-out reaction from a Cl secondary beam at 42 AMeV. The rays following…
Charge Radii Measurements of Exotic Tin Isotopes in the Proximity of and
F. P. Gustafsson, L. V. RodrÃguez, R. F. Garcia Ruiz +51
We report nuclear charge radii for the isotopes Sn, measured using two different collinear laser spectroscopy techniques at ISOLDE-CERN. These measurements clarify the…
Unbound neutron strength in C and the N=16 shell gap
J. Lois-Fuentes, B. Fernández-DomÃnguez, F. Delaunay +61
Significant continuum strength has been observed to be populated in C produced in the d(C,p) reaction at a beam energy of 17.2~MeV/nucleon. The strength appears at gr…
Search for new resonant states in 10C and 11C and their impact on the cosmological lithium problem
F. Hammache, A. Coc, N. de Séréville +28
The observed primordial 7Li abundance in metal-poor halo stars is found to be lower than its Big-Bang nucleosynthesis (BBN) calculated value by a factor of approximately three. Som…
Search for a neutron dark decay in He
M. Le Joubioux, H. Savajols, W. Mittig +24
Neutron dark decays have been suggested as a solution to the discrepancy between bottle and beam experiments, providing a dark matter candidate that can be searched for in halo nuc…
Beta delayed neutron emission of Cd
M. Madurga, Z. Y. Xu, 1 R. Grzywacz +54
Using the time-of-flight technique, we measured the beta-delayed neutron emission of Cd. From our large-scale shell model (LSSM) calculation using the NLO interaction […
Persistence of the shell gap in isobars: Identification of a possible s isomer in Co and decay to Ni
S. Escrig, A. I. Morales, S. Nishimura +40
Background: The evolution of shell structure around doubly magic exotic nuclei is of great interest in nuclear physics and astrophysics. In the `southwest' region of Ni, the…
Spectroscopy of short-lived radioactive molecules: A sensitive laboratory for new physics
R. F. Garcia Ruiz, R. Berger, J. Billowes +24
The study of molecular systems provides exceptional opportunities for the exploration of the fundamental laws of nature and for the search for physics beyond the Standard Model of…
First Results on In-Beam gamma Spectroscopy of Neutron-Rich Na and Mg Isotopes at REX-ISOLDE
H. Scheit, O. Niedermaier, M. Pantea +46
After the successful commissioning of the radioactive beam experiment at ISOLDE (REX-ISOLDE) - an accelerator for exotic nuclei produced by ISOLDE - first physics experiments using…
A First Glimpse at the Shell Structure beyond Ca: Spectroscopy of K, Ca, and Ca
T. Koiwai, K. Wimmer, P. Doornenbal +80
States in the and 37 isotopes Ca have been populated by direct proton-induced nucleon removal reactions from Sc and Ca beams at the RIBF. In addit…
Coulomb and nuclear excitations of Zn and Ni at intermediate energy
S. Calinescu, O. Sorlin, I. Matea +48
The reduced transition probabilities in Zn and the full strength up to S=7.79 MeV in N…
Mirror nucleon-transfer reactions from Ne and O
F. Flavigny, N. Keeley, A. Gillibert +26
The Ne(d,t)Ne and Ne(d,He)F single-nucleon pickup reactions were measured at 16.5 MeV/nucleon in inverse kinematics together with elastic and inelas…
Laser spectroscopy of francium isotopes at the borders of the region of reflection asymmetry
I. BudinÄeviÄ, J. Billowes, M. L. Bissell +17
The magnetic dipole moments and changes in mean-square charge radii of the neutron-rich isotopes were measured with the newly-installed Collinear Res…
Spectroscopy of K
M. Enciu, A. Obertelli, P. Doornenbal +78
The first spectroscopy of K was investigated via in-beam -ray spectroscopy at the RIKEN Radioactive Isotope Beam Factory after one-proton and one-neutron knockout from $…
Dipole and quadrupole moments of Cu as a test of the robustness of the shell closure near Ni
R. P. de Groote, J. Billowes, C. L. Binnersley +21
Nuclear spins and precise values of the magnetic dipole and electric quadrupole moments of the ground-states of neutron-rich Cu isotopes were measured using the Collinear…
Ionization potential of radium monofluoride
S. G. Wilkins, H. A. Perrett, S. M. Udrescu +43
The ionization potential (IP) of radium monofluoride (RaF) was measured to be 4.969(2)[10] eV, revealing a relativistic enhancement in the series of alkaline earth monofluorides. T…
Shell evolution of isotones towards Ca: First spectroscopy of Ti
M. L. Cortés, W. Rodriguez, P. Doornenbal +81
Excited states in the isotone Ti were populated via the VTi reaction at 200~MeV/u at the Radioactive Isotope Beam Factory and studied usin…
Instrumentation for high-resolution laser spectroscopy at the ALTO radioactive-beam facility
D. T. Yordanov, D. Atanasov, M. L. Bissell +8
Collinear laser spectroscopy is one of the essential tools for nuclear-structure studies. It allows nuclear electromagnetic properties of ground and isomeric states to be extracted…
A prototype gas cell for the stopping, extraction and neutralization of radioactive nuclei from the SPIRAL2 Super Separator Spectrometer (S)
W. Dong, V. Manea, R. Ferrer +9
We present the design and simulation of a prototype gas cell for in-gas-jet laser-ionization and spectroscopy studies using the low energy branch of the SPIRAL2-S radioactive-i…
Experimental study of the two-body spin-orbit force
G. Burgunder, O. Sorlin, F. Nowacki +31
Energies and spectroscopic factors of the first , , and states in the Si nucleus were determined by means of the (d,p) transfer reaction…
How Robust is the N = 34 Subshell Closure? First Spectroscopy of Ar
H. N. Liu, A. Obertelli, P. Doornenbal +77
The first -ray spectroscopy of Ar, with the neutron number N = 34, was measured using the K(p,2p) one-proton removal reaction at 210 MeV/u at the RIBF facil…
N=16 magicity revealed at the proton drip-line through the study of 35Ca
L. Lalanne, O. Sorlin, A. Poves +27
The last proton bound calcium isotope Ca has been studied for the first time, using the Ca()Ca two neutron transfer reaction. The radioactive Ca n…
Collapse of the N=28 shell closure in Si
B. Bastin, S. Grévy, D. Sohler +34
The energies of the excited states in very neutron-rich Si and P have been measured using in-beam -ray spectroscopy from the fragmentation of secondary beams o…
Science4Peace: A Plea for Continued Peaceful International Scientific Cooperation (Input to the European Strategy for Particle Physics -- 2026 update)
A. Ali, M. Barone, D. Britzger +16
The European Strategy for Particle Physics (ESPP) - 2026 update is taking place in a turbulent international climate. Many of the norms that have governed relations between states…
Decay-assisted collinear resonance ionization spectroscopy: Application to neutron-deficient francium
K. M. Lynch, J. Billowes, M. L. Bissell +17
This paper reports on the hyperfine-structure and radioactive-decay studies of the neutron-deficient francium isotopes Fr performed with the Collinear Resonance Ionizat…
The structure of Ca under the Coulomb magnifying glass
L. Lalanne, O. Sorlin, A. Poves +28
Detailed spectroscopy of the neutron-deficient nucleus Ca was obtained up to 9 MeV using the Ca(,)Ca and the Ca(,)Ca transfer reactio…