Publications (66)
Neutron single-particle strength in silicon isotopes: Constraining the driving forces of shell evolution
S. R. Stroberg, A. Gade, J. A. Tostevin +16
Shell evolution is studied in the neutron-rich silicon isotopes 36,38,40 Si using neutron single-particle strengths deduced from one-neutron knockout reactions. Configurations invo…
In-beam -ray spectroscopy of Mg via direct reactions
N. Kitamura, K. Wimmer, T. Miyagi +26
Background: The nucleus Mg ( and ) plays a central role in the so-called "island of inversion" where in the ground states -shell neutrons are promoted to the…
Systematic investigation of projectile fragmentation using beams of unstable B and C isotopes
R. Thies, A. Heinz, T. Adachi +119
Background: Models describing nuclear fragmentation and fragmentation-fission deliver important input for planning nuclear physics experiments and future radioactive ion beam facil…
The Status and Future of Direct Nuclear Reaction Measurements for Stellar Burning
M. Aliotta, R. Buompane, M. Couder +22
The study of stellar burning began just over 100 years ago. Nonetheless, we do not yet have a detailed picture of the nucleosynthesis within stars and how nucleosynthesis impacts s…
Experimental demonstration of a controlled-NOT wave-packet gate
B. DeMarco, A. Ben-Kish, D. Leibfried +8
We report the experimental demonstration of a controlled-NOT (CNOT) quantum logic gate between motional and internal state qubits of a single ion where, as opposed to previously de…
First Proton-Induced Cross Sections on a Stored Rare Ion Beam: Measurement of 118Te(p,γ) for Explosive Nucleosynthesis
F. Dellmann, J. Glorius, Yu. A. Litvinov +75
We present the first nuclear cross-section measurements of (p,γ) and (p,n) reactions on 118Te at energies relevant for the γ-process nucleosynthesis. Absolute cross-section value…
Experimental demonstration of a technique to generate arbitrary quantum superposition states
A. Ben-Kish, B. DeMarco, V. Meyer +8
Using a single, harmonically trapped Be ion, we experimentally demonstrate a technique for generation of arbitrary states of a two-level particle confined by a harmonic pot…
Weakly Bound Neutron-Rich Nuclei and Cosmic Phenomena
Ushasi Datta, A. Rahaman, S. Chakraborty +38
The single particle and bulk properties of the neutron-rich nuclei constrain fundamental issues in nuclear physics and nuclear astrophysics like the limits of existence of quantum…
Unexpected distribution of strength in the calcium isotopes at =30
H. L. Crawford, A. O. Macchiavelli, P. Fallon +30
The calcium isotopes have emerged as an important testing ground for new microscopically derived shell-model interactions, and a great deal of focus has been directed toward this r…
Coulomb breakup of neutron-rich Na isotopes near the island of inversion
A . Rahaman, Ushasi Datta, T. Aumann +50
First results are reported on the ground state configurations of the neutron-rich Na isotopes, obtained via Coulomb dissociation (CD) measurements as a method of the dire…
Hyperfine Coherence in the Presence of Spontaneous Photon Scattering
R. Ozeri, C. Langer, J. D. Jost +11
The coherence of a hyperfine-state superposition of a trapped Be ion in the presence of off-resonant light is experimentally studied. It is shown that Rayleigh elastic sc…
A microfabricated surface-electrode ion trap in silicon
J. Britton, D. Leibfried, J. Beall +13
The prospect of building a quantum information processor underlies many recent advances ion trap fabrication techniques. Potentially, a quantum computer could be constructed from a…
Beyond the Neutron Drip-Line: The Unbound Oxygen Isotopes 25O and 26O
C. Caesar, J. Simonis, T. Adachi +121
The very neutron-rich oxygen isotopes 25O and 26O are investigated experimentally and theoret- ically. In this first R3B-LAND experiment, the unbound states are populated at GSI vi…
A microfabricated surface-electrode ion trap for scalable quantum information processing
S. Seidelin, J. Chiaverini, R. Reichle +12
We demonstrate confinement of individual atomic ions in a radio-frequency Paul trap with a novel geometry where the electrodes are located in a single plane and the ions confined a…
Transport dynamics of single ions in segmented microstructured Paul trap arrays
R. Reichle, D. Leibfried, R. B. Blakestad +7
It was recently proposed to use small groups of trapped ions as qubit carriers in miniaturized electrode arrays that comprise a large number of individual trapping zones, between w…
Trapped-Ion Quantum Simulator: Experimental Application to Nonlinear Interferometers
D. Leibfried, B. DeMarco, V. Meyer +8
We show how an experimentally realized set of operations on a single trapped ion is sufficient to simulate a wide class of Hamiltonians of a spin-1/2 particle in an external potent…
GEANT4 simulation of the neutron background of the CD set-up for capture studies at n_TOF
TOF collaboration, P. Žugec, N. Colonna +104
The neutron sensitivity of the CD detector setup used at n_TOF for capture measurements has been studied by means of detailed GEANT4 simulations. A realistic software repli…
Sympathetic cooling of and for quantum logic
M. D. Barrett, B. DeMarco, T. Schaetz +9
We demonstrate the cooling of a two species ion crystal consisting of one and one ion. Since the respective cooling transitions of these two species are separa…
Quantum information processing with trapped ions
D. J. Wineland, M. Barrett, J. Britton +9
Experiments directed towards the development of a quantum computer based on trapped atomic ions are described briefly. We discuss the implementation of single qubit operations and…
Measurement of the C()B cross section at n_TOF (CERN) by in-beam activation analysis
P. Žugec, N. Colonna, D. Bosnar +101
The integral cross section of the C()B reaction has been determined for the first time in the neutron energy range from threshold to several GeV at the n_TOF fac…
Simplified motional heating rate measurements of trapped ions
R. J. Epstein, S. Seidelin, D. Leibfried +13
We have measured motional heating rates of trapped atomic ions, a factor that can influence multi-ion quantum logic gate fidelities. Two simplified techniques were developed for th…
Mass measurement of 56Sc reveals a small A=56 odd-even mass staggering, implying a cooler accreted neutron star crust
Z. Meisel, S. George, S. Ahn +29
We present the mass excesses of 52-57Sc, obtained from recent time-of-flight nuclear mass measurements at the National Superconducting Cyclotron Laboratory at Michigan State Univer…
High accuracy determination of the U/U fission cross section ratio up to 1 GeV at n_TOF (CERN)
C. Paradela, M. Calviani, D. TarrÃo +104
The U to U fission cross section ratio has been determined at n_TOF up to 1 GeV, with two different detection systems, in different geometrical configurations…
Integral measurement of the C(n,p)B reaction up to 10 GeV
P. Žugec, N. Colonna, D. Bosnar +102
The integral measurement of the C(n,p)B reaction was performed at the neutron time of flight facility n_TOF at CERN. The total number of B nuclei produced per…
Probing the Z = 6 spin-orbit shell gap with (p,2p) quasi-free scattering reactions
I. Syndikus, M. Petri, A. O. Macchiavelli +76
The evolution of the traditional nuclear magic numbers away from the valley of stability is an active field of research. Experimental efforts focus on providing key spectroscopic i…
Cantilever cooling with radio frequency circuits
D. J. Wineland, J. Britton, R. J. Epstein +8
We consider a method to reduce the kinetic energy in a low-order mode of a miniature cantilever. If the cantilever contributes to the capacitance of a driven RF circuit, a force on…
Nuclear astrophysics with radioactive ions at FAIR
R. Reifarth, S. Altstadt, K. Göbel +317
The nucleosynthesis of elements beyond iron is dominated by neutron captures in the s and r processes. However, 32 stable, proton-rich isotopes cannot be formed during those proces…
Experimental neutron capture data of Ni from the CERN n_TOF facility
TOF collaboration, P. Žugec, M. Barbagallo +99
The Ni cross section has been measured at the neutron time of flight facility n_TOF at CERN, in the energy range from 27 meV up to 400 keV. In total, 51 resonances…
Effective proton-neutron interaction near the drip line from unbound states in F
M. Vandebrouck, A. Lepailleur, O. Sorlin +107
Background: Odd-odd nuclei, around doubly closed shells, have been extensively used to study proton-neutron interactions. However, the evolution of these interactions as a function…
Surface-Electrode Architecture for Ion-Trap Quantum Information Processing
J. Chiaverini, R. B. Blakestad, J. Britton +5
We investigate a surface-mounted electrode geometry for miniature linear radio frequency Paul ion traps. The electrodes reside in a single plane on a substrate, and the pseudopoten…
A high fidelity light-shift gate for clock-state qubits
C. H. Baldwin, B. J. Bjork, M. Foss-Feig +7
To date, the highest fidelity quantum logic gates between two qubits have been achieved with variations on the geometric-phase gate in trapped ions, with the two leading variants b…
Strong neutron pairing in core+4n nuclei
A. Revel, F. M. Marques, O. Sorlin +100
The emission of neutron pairs from the neutron-rich isotones C and O has been studied by high-energy nucleon knockout from N and O secondary…
Mass Measurements Demonstrate a Strong N =28 Shell Gap in Argon
Z. Meisel, S. George, S. Ahn +28
We present results from recent time-of-flight nuclear mass measurements at the National Superconducting Cyclotron Laboratory at Michigan State University. We report the first mass…
-decay of V and its Role in Cooling Accreted Neutron Star Crusts
W. -J. Ong, E. F. Brown, J. Browne +20
The interpretation of observations of cooling neutron star crusts in quasi-persistent X-ray transients is affected by predictions of the strength of neutrino cooling via crust Urca…
Measurement of the 92,93,94,100Mo(g,n) reactions by Coulomb Dissociation
K. Göbel, P. Adrich, S. Altstadt +70
The Coulomb Dissociation (CD) cross sections of the stable isotopes 92,94,100Mo and of the unstable isotope 93Mo were measured at the LAND/R3B setup at GSI Helmholtzzentrum für Sc…
Neutron capture cross section of unstable 63Ni: implications for stellar nucleosynthesis
C. Lederer, C. Massimi, S. Altstadt +102
The Ni() cross section has been measured for the first time at the neutron time-of-flight facility n\_TOF at CERN from thermal neutron energies up to 200 keV. In tota…
Isobaric multiplet mass equation in the quartets
M. B. Bennett, C. Wrede, B. A. Brown +20
The observed mass excesses of analog nuclear states with the same mass number and isospin can be used to test the isobaric multiplet mass equation (IMME), which has, in mos…
Fluorescence during Doppler cooling of a single trapped atom
J. H. Wesenberg, R. J. Epstein, D. Leibfried +10
We investigate the temporal dynamics of Doppler cooling of an initially hot single trapped atom in the weak binding regime using a semiclassical approach. We develop an analytical…
Nuclear Mass Measurements Map the Structure of Atomic Nuclei and Accreting Neutron Stars
Z. Meisel, S. George, S. Ahn +28
We present mass excesses (ME) of neutron-rich isotopes of Ar through Fe, obtained via TOF- mass spectrometry at the National Superconducting Cyclotron Laboratory. Our new resu…
Neutron-skin thickness from the study of the anti-analog giant dipole resonance
A. Krasznahorkay, L. Stuhl, M. Csatlós +57
The gamma-decay of the anti-analog of the giant dipole resonance (AGDR) has been measured to the isobaric analog state excited in the p(124Sn,n) reaction at a beam energy of 600 Me…
Storage, Accumulation and Deceleration of Secondary Beams for Nuclear Astrophysics
J. Glorius, Yu. A. Litvinov, M. Aliotta +61
Low-energy investigations on rare ion beams are often limited by the available intensity and purity of the ion species in focus. Here, we present the first application of a techniq…
Approaching the Gamow window with stored ions: Direct measurement of Xe(p,) in the ESR storage ring
J. Glorius, C. Langer, Z. Slavkovská +63
We report the first measurement of low-energy proton-capture cross sections of Xe in a heavy ion storage ring. Xe ions of five different beam energies betwe…
Determination of the Bi(n,)Bi cross section using the NICE-Detector
K. Al-Khasawneh, E. Borris, B. Brückner +12
The capture cross section of Bi(n,)Bi was measured at different astrophysically energies including thermal capture cross section (25 meV), resonance integral,…
High-precision mass measurement of Si and a refined determination of the process at the waiting point
D. Puentes, Z. Meisel, G. Bollen +11
We report a high precision mass measurement of , performed with the LEBIT facility at the National Superconducting Cyclotron Laboratory. The atomic mass excess, $10\…
Low-lying level structure of Cu and its implications on the rp process
W-J. Ong, C. Langer, F. Montes +39
The low-lying energy levels of proton-rich Cu have been extracted using in-beam -ray spectroscopy with the state-of-the-art -ray tracking array GRETINA in conjunctio…
Neutron capture cross section measurement of 238U at the n TOF CERN facility with C6D6 scintillation detectors in the energy region from 1 eV to 700 keV
TOF Collaboration, F. Mingrone, C. Massimi +102
The aim of this work is to provide a precise and accurate measurement of the 238U(n,g) reaction cross section in the energy region from 1 eV to 700 keV. This reaction is of fundame…
Spectroscopy of Na: shell evolution toward the drip line
A. Lepailleur, K. Wimmer, A. Mutschler +40
Excited states in Na have been studied using the -decay of implanted Ne ions at GANIL/LISE as well as the in-beam -ray spectroscopy at the NSCL/S800 facility.…
Extraction of the non-spin- and spin-transfer isovector responses via the reaction
Sk M. Ali, C. Maher, R. G. T. Zegers +19
The isovector response in B was investigated via the C(,+)B reaction at . By utilizing the…
Unveiling the Two-Proton Halo Character of 17Ne: Exclusive Measurement of Quasi-free Proton-Knockout Reactions
C. Lehr, F. Wamers, F. Aksouh +62
The proton drip-line nucleus 17Ne is investigated experimentally in order to determine its two-proton halo character. A fully exclusive measurement of the 17Ne(p,2p)16F->15O+p quas…
Coexisting normal and intruder configurations in Mg
N. Kitamura, K. Wimmer, A. Poves +25
Situated in the so-called "island of inversion," the nucleus Mg is considered as an archetypal example of the disappearance of magicity at . We report on high statisti…
-particle energy-summing correction for -delayed proton emission measurements
Z. Meisel, M. del Santo, H. L. Crawford +6
A common approach to studying -delayed proton emission is to measure the energy of the emitted proton and corresponding nuclear recoil in a double-sided silicon-strip detector…
Nuclear Structure Towards N=40 60Ca: In-beam gamma-ray Spectroscopy of 58,60Ti
A. Gade, R. V. F. Janssens, D. Weisshaar +28
Excited states in the neutron-rich N=38,36 nuclei \nuc{60}{Ti} and \nuc{58}{Ti} were populated in nucleon-removal reactions from \nuc{61}{V} projectiles at 90~MeV/nucleon. The γ-r…
Electron capture of Xe in collisions with H molecules in the energy range between 5.5 MeV/u and 30.9 MeV/u
F. M. Kröger, G. Weber, M. O. Herdrich +63
The electron capture process was studied for Xe colliding with H molecules at the internal gas target of the ESR storage ring at GSI, Darmstadt. Cross section values fo…
Transport of Quantum States and Separation of Ions in a Dual RF Ion Trap
M. A. Rowe, A. Ben-Kish, B. DeMarco +10
We have investigated ion dynamics associated with a dual linear ion trap where ions can be stored in and moved between two distinct locations. Such a trap is a building block for a…
Long-lived qubit memory using atomic ions
C. Langer, R. Ozeri, J. D. Jost +13
We demonstrate experimentally a robust quantum memory using a magnetic-field-independent hyperfine transition in 9Be+ atomic ion qubits at a magnetic field B ~= 0.01194 T. We obser…
Quantum control, quantum information processing, and quantum-limited metrology with trapped ions
D. J. Wineland, D. Leibfried, M. D. Barrett +21
We briefly discuss recent experiments on quantum information processing using trapped ions at NIST. A central theme of this work has been to increase our capabilities in terms of q…
Entangled Mechanical Oscillators
J. D. Jost, J. P. Home, J. M. Amini +6
Hallmarks of quantum mechanics include superposition and entanglement. In the context of large complex systems, these features should lead to situations like Schrodinger's cat, whi…
Constraining the Neutron Star Compactness: Extraction of the Al() Reaction Rate for the -Process
C. Wolf, C. Langer, F. Montes +33
The Al()Si reaction is among the most important reactions driving the energy generation in Type-I X-ray bursts. However, the present reaction-rate uncertainty l…
Isospin Mixing Reveals P()S Resonance Influencing Nova Nucleosynthesis
M. B. Bennett, C. Wrede, B. A. Brown +21
The thermonuclear P()S reaction rate is critical for modeling the final elemental and isotopic abundances of ONe nova nucleosynthesis, which affect the calibrat…
Errors in trapped-ion quantum gates due to spontaneous photon scattering
R. Ozeri, W. M. Itano, R. B. Blakestad +9
We analyze the error in trapped-ion, hyperfine qubit, quantum gates due to spontaneous scattering of photons from the gate laser beams. We investigate single-qubit rotations that a…
Determination of luminosity for in-ring reactions: A new approach for the low-energy domain
Y. M. Xing, J. Glorius, L. Varga +59
Luminosity is a measure of the colliding frequency between beam and target and it is a crucial parameter for the measurement of absolute values, such as reaction cross sections. In…
Randomized Benchmarking of Quantum Gates
E. Knill, D. Leibfried, R. Reichle +7
A key requirement for scalable quantum computing is that elementary quantum gates can be implemented with sufficiently low error. One method for determining the error behavior of a…
Time-of-flight mass measurements of neutron-rich chromium isotopes up to N = 40 and implications for the accreted neutron star crust
Z. Meisel, S. George, S. Ahn +29
We present the mass excesses of 59-64Cr, obtained from recent time-of-flight nuclear mass measurements at the National Superconducting Cyclotron Laboratory at Michigan State Univer…
Determination of the Neutron-Capture Rate of 17C for the R-process Nucleosynthesis
M. Heine, S. Typel, M. -R. Wu +124
With the RB-LAND setup at GSI we have measured exclusive relative-energy spectra of the Coulomb dissociation of C at a projectile energy around 425~AMeV on a lead targ…
Improved Nuclear Physics Near Refines Urca Neutrino Luminosities in Accreted Neutron Star Crusts
Zach Meisel, Alec Hamaker, G. Bollen +16
We performed a Penning trap mass measurement of at the National Superconducting Cyclotron Laboratory and NuShellX calculations of the and $^{62}{\rm…
Ni() and Ni() cross sections measured at n_TOF/CERN
C. Lederer, C. Massimi, E. Berthoumieux +112
The cross section of the Ni() reaction was measured with the time-of-flight technique at the neutron time-of-flight facility n_TOF at CERN. Capture kernels of 42 reson…