Publications (40)
In-beam -ray spectroscopy of negative-parity states of K populated in dissipative reactions
T. Beck, A. Gade, B. A. Brown +11
In-beam -ray spectroscopy was used to study excited states of the neutron-deficient nucleus K populated in fast-beam inelastic-scattering and proton-removal reactions at…
Probing proton cross-shell excitations through the two-neutron removal from 38Ca
T. Beck, A. Gade, B. A. Brown +12
Bound states of the neutron-deficient, near-dripline nucleus Ca were populated in two-neutron removal from the ground state of Ca, a direct reaction sensitive to the…
Experimental Study of the S Excited Level Scheme
C. R. Hoffman, R. S. Lubna, E. Rubino +20
Information on the S level scheme was expanded through experimental work utilizing a fusion-evaporation reaction and in-beam -ray spectroscopy. Prompt -ray transitio…
Impact of clustering on the Li decay and recoil form factors
G. H. Sargsyan, K. D. Launey, M. T. Burkey +10
We place unprecedented constraints on recoil corrections in the decay of Li, by identifying a strong correlation between them and the Li ground state quadrupole moment…
Microsecond Isomer at the N=20 Island of Shape Inversion Observed at FRIB
T. J. Gray, J. M. Allmond, Z. Xu +63
Excited-state spectroscopy from the first Facility for Rare Isotope Beams (FRIB) experiment is reported. A 24(2)-s isomer was observed with the FRIB Decay Station initiator (FD…
Constraints for stellar electron-capture rates on Kr via the Kr(,He)Br reaction and the implications for core-collapse supernovae
R. Titus, E. M. Ney, R. G. T. Zegers +20
In the late stages of stellar core-collapse, prior to core bounce, electron captures on medium-heavy nuclei drive deleptonization and simulations require the use of accurate reacti…
Zn -delayed proton emission establishes the Ni -process waiting point bypass
M. Saxena, W. -J Ong, Z. Meisel +32
We measured the Zn -delayed proton (p) and emission at the National Superconducting Cyclotron Laboratory. We find a Zn half-life of 43.6 0.2 ms, $Î…
In-beam -ray spectroscopy at the proton dripline: Sc
A. Gade, D. Weisshaar, B. A. Brown +10
We report on the first in-beam -ray spectroscopy of the proton-dripline nucleus Sc using two-nucleon pickup onto an intermediate-energy rare-isotope beam of Ca. T…
Probing the role of proton cross-shell excitations in 70Ni using nucleon knockout reactions
B. Elman, A. Gade, R. V. F. Janssens +21
The neutron-rich Ni isotopes have attracted attention in recent years due to the occurrence of shape or configuration coexistence. We report on the difference in population of exci…
Is the structure of 42Si understood?
A. Gade, B. A. Brown, J. A. Tostevin +10
A more detailed test of the implementation of nuclear forces that drive shell evolution in the pivotal nucleus \nuc{42}{Si} -- going beyond earlier comparisons of excited-state ene…
Dissipative reactions with intermediate-energy beams -- a novel approach to populate complex-structure states in rare isotopes
A. Gade, B. A. Brown, D. Weisshaar +10
A novel pathway for the formation of multi-particle-multi-hole (np-mh) excited states in rare isotopes is reported from highly energy- and momentum-dissipative inelastic-scattering…
Exploiting dissipative reactions to perform in-beam -ray spectroscopy of the neutron-deficient isotopes \nuc{38,39}{Ca}
A. Gade, D. Weisshaar, B. A. Brown +10
The neutron-deficient Ca isotopes continue to attract attention due to their importance for testing isospin symmetry and their relevance in capture reactions of interest for nova n…
In-beam -ray spectroscopy towards the proton dripline: The curious case of Ar
T. Beck, A. Gade, B. A. Brown +12
High-resolution in-beam -ray spectroscopy was used to study excited states of the neutron-deficient nucleus Ar populated in fast-beam induced four- and six-nucleon remov…
Spectroscopy and lifetime measurements near the proton drip line: P
B. Longfellow, A. Gade, B. A. Brown +10
We report on the observation of excited states in the neutron-deficient phosphorus isotopes P via in-beam gamma-ray spectroscopy with both high-efficiency and high-res…
The structure of 70Fe: Single-particle and collective degrees of freedom
A. Gade, R. V. F. Janssens, J. A. Tostevin +16
Excited states in the neutron-rich \nuc{70}{Fe} nucleus were populated in a one-proton removal reaction from \nuc{71}{Co} projectiles at 87~MeV/nucleon. A new transition was observ…
Fundamental Symmetries, Neutrons, and Neutrinos (FSNN): Whitepaper for the 2023 NSAC Long Range Plan
B. Acharya, C. Adams, A. A. Aleksandrova +176
This whitepaper presents the research priorities decided on by attendees of the 2022 Town Meeting for Fundamental Symmetries, Neutrons and Neutrinos, which took place December 13-1…
Electromagnetic properties of O for benchmarking nuclear Hamiltonians
S. Heil, M. Petri, K. Vobig +25
The structure of exotic nuclei provides valuable tests for state-of-the-art nuclear theory. In particular electromagnetic transition rates are more sensitive to aspects of nuclear…
Improved Limit on Tensor Currents in the Weak Interaction from Li Decay
M. T. Burkey, G. Savard, A. T. Gallant +28
The electroweak interaction in the Standard Model (SM) is described by a pure vector-axial-vector structure, though any Lorentz-invariant component could contribute. In this work,…
Determination of proton and neutron contributions to the excitations in Si and S using inelastic proton scattering in inverse kinematics and intermediate energy Coulomb excitation
L. A. Riley, I. Conroy, A. M. Himmelreich +26
We have measured the transition in the neutron rich isotope Si using the probes of intermediate energy Coulomb excitation and inelastic…
Precision Tests of Isospin Symmetry through Coulomb excitation of A = 62 Nuclei
K. Wimmer, T. Hüyük, S. M. Lenzi +24
Isospin symmetry in the mass system was investigated through Coulomb excitation reactions at the RIKEN Radioactive Isotope Beam Factory. Beams of Zn, Ga, and $…
One-proton and one-neutron knockout reactions from Ni to the mirror pair Co and Ni
M. Spieker, A. Gade, D. Weisshaar +15
We present a high-resolution in-beam -ray spectroscopy study of excited states in the mirror nuclei Co and Ni following one-nucleon knockout from a projectile bea…
Horizons: Nuclear Astrophysics in the 2020s and Beyond
H. Schatz, A. D. Becerril Reyes, A. Best +162
Nuclear Astrophysics is a field at the intersection of nuclear physics and astrophysics, which seeks to understand the nuclear engines of astronomical objects and the origin of the…
The Beta-decay Paul Trap Mk IV: Design and commissioning
L. Varriano, G. Savard, J. A. Clark +29
The Beta-decay Paul Trap is an open-geometry, linear trap used to measure the decays of Li and B to search for a tensor contribution to the weak interaction. In the latest…
Isospin symmetry in the triplet
K. Wimmer, P. Ruotsalainen, S. M. Lenzi +44
Excited states in the nuclei Ga and Ge were populated in direct reactions of relativistic radioactive ion beams at the RIBF. Coincident \grays were meas…
$β^-$ decay of neutron-rich Cl at magic number N=28
Soumik Bhattacharya, Vandana Tripathi, S. L. Tabor +25
Results from the study of $β^-$-decay of Cl, produced in the fragmentation of a 140-MeV/u Ca beam, are presented. The half-life for Cl -decay is measured…
Single-particle shell strengths near the doubly magic nucleus Ni and the Ni(p,)Cu reaction rate in explosive astrophysical burning
D. Kahl, P. J. Woods, T. Poxon-Pearson +24
Angle-integrated cross-section measurements of the Ni(d,n) and (d,p) stripping reactions have been performed to determine the single-particle strengths of low-lying excited…
The Core of F studied by the F(-1p)O reaction
H. L. Crawford, M. D. Jones, A. O. Macchiavelli +19
The F(O reaction was studied at the NSCL using the S800 spectrometer. The experimental spectroscopic factor for the ground-state to ground-state transiti…
Shell structure of S and collapse of the shell closure
S. Momiyama, K. Wimmer, D. Bazin +13
The single-particle structure of the isotones provides insights into the shell evolution of neutron-rich nuclei from the doubly-magic Ca toward the drip line. …
Experimental identification of the , state of Co and isospin symmetry in studied via one-nucleon knockout reactions
M. Spieker, D. Weisshaar, A. Gade +15
New experimental data obtained from -ray tagged one-neutron and one-proton knockout from Co is presented. A candidate for the sought-after sta…
Two-neutron knockout as a probe of the composition of states in Mg, Al, and Si
B. Longfellow, A. Gade, J. A. Tostevin +12
Simpson and Tostevin proposed that the width and shape of exclusive parallel momentum distributions of the A-2 residue in direct two-nucleon knockout reactions carry a measurable s…
Extraction of neutron-capture cross sections on Zr using the charge-exchange Oslo method
N. D. Pathirana, R. G. T. Zegers, B. Gao +16
The Nb(,He) reaction at 115 MeV/u was studied to demonstrate that nuclear level densities and -ray strength functions can be extracted from charge-exchange reac…
Universal Effective Charges in the and Shells
T. H. Ogunbeku, J. M. Allmond, T. J. Gray +79
The 247-keV state in Sc, populated in the decay of Ca, is reported here as a nanosecond isomer with a half-life of 26.0(22) ns. The state is interpreted as the $…
Low spin spectroscopy of neutron-rich 43,44,45Cl via β and (β}n decay
V. Tripathi, S. Bhattacharya, E. Rubino +27
β decay of neutron-rich isotopes 43,45 S,studied at the National Superconducting Cyclotron Laboratory is reported here. β delayed γ transitions were detected by an array of 16 c…
Inverse-kinematics proton scattering from S, P and the collapse of the major shell closure
L. A. Riley, D. Bazin, J. Belarge +21
Excited states of the neutron-rich isotopes S and P have been studied via inverse-kinematics proton scattering from a liquid hydrogen target, using the GRETINA…
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…
Exploring decay and -delayed neutron emission in exotic Cl isotopes
Vandana Tripathi, B. Longfellow, A. Volya +24
In this paper, $β^-$ and -delayed neutron decays of Cl are reported from an experiment carried out at the National Superconducting Cyclotron Laboratory using the Bet…
Beta-decay Half Lives beyond Ca: A Systematic Survey of Decay Properties approaching the Neutron Dripline
W. -J. Ong, Z. Y. Xu, R. Grzywacz +83
In an experiment performed at the Facility for Rare Isotope Beams (FRIB) using the FRIB Decay Station initiator (FDSi), 15 new half lives of isotopes near Ca were measured.…
Object Detection with Deep Learning for Rare Event Search in the GADGET II TPC
Tyler Wheeler, S. Ravishankar, C. Wrede +50
In the pursuit of identifying rare two-particle events within the GADGET II Time Projection Chamber (TPC), this paper presents a comprehensive approach for leveraging Convolutional…
Nuclear decay as a probe for physics beyond the Standard Model
M. Brodeur, N. Buzinsky, M. A. Caprio +43
This white paper was submitted to the 2022 Fundamental Symmetries, Neutrons, and Neutrinos (FSNN) Town Hall Meeting in preparation for the next NSAC Long Range Plan. We advocate to…
Experimental Constraint on Stellar Electron-Capture Rates from the reaction at 115 MeV/u
J. C. Zamora, R. G. T. Zegers, Sam M. Austin +22
The Gamow-Teller strength distribution from Sr was extracted from a experiment at 115 MeV/ to constrain estimates for the electron-capture rate…