Publications (34)
Single neutron transfer on 23Ne and its relevance forthepathway ofnucleosynthesis in astrophysical X-ray bursts
G. Lotay, J. Henderson, W. N. Catford +32
We present new experimental measurements of resonance strengths in the astrophysical 23Al(p, γ)24Si reaction, constraining the pathway of nucleosynthesis beyond 22Mg in X-ray burs…
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…
Study of the Mg waiting point relevant for x-ray burst nucleosynthesis via the Mg(,)Al reaction
H. Jayatissa, M. L. Avila, K. E. Rehm +13
The Mg(,)Al reaction rate has been identified as a major source of uncertainty for understanding the nucleosynthesis flow in Type-I x-ray bursts (XRBs). We rep…
First direct measurement constraining the Ar(,p)K reaction cross section for mixed hydrogen and helium burning in accreting neutron stars
J. Browne, K. A. Chipps, K. Schmidt +25
The rate of the final step in the astrophysical p-process, the Ar(,\textit{p})K reaction, suffers from large uncertainties due to lack of experimental data, d…
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…
First direct measurement of Mg(,p)Al and implications for X-ray burst model-observation comparisons
J. S. Randhawa, Y. Ayyad, W. Mittig +26
Type-I X-ray burst (XRB) light curves are sensitive to the model's nuclear input and consequently affects the model-observation comparisons. Mg(,p)Al is among the…
Direct measurement of Cu(,)Ni precludes a strong NiCu cycle in Type-I X-ray bursts
N. Bhathi, J. S. Randhawa, R. Kanungo +36
Model-observation comparisons of type-I X-ray bursts (XRBs) can reveal the properties of accreting neutron star systems, including the neutron star compactness. XRBs are powered by…
Determination of the Zn level density from neutron evaporation spectra
D. Soltesz, M. A. A. Mamun, A. V. Voinov +9
Nuclear reactions of interest for astrophysics and applications often rely on statistical model calculations for nuclear reaction rates, particularly for nuclei far from -stabi…
The He BF Giant Barrel (HeBGB) Neutron Detector
K. Brandenburg, G. Hamad, Z. Meisel +12
reactions play an important role in nuclear astrophysics and applications and are an important background source in neutrino and dark matter detectors. Measurements of tot…
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…
Dependence of X-Ray Burst Models on Nuclear Reaction Rates
R. H. Cyburt, A. M. Amthor, A. Heger +5
X-ray bursts are thermonuclear flashes on the surface of accreting neutron stars and reliable burst models are needed to interpret observations in terms of properties of the neutro…
Measurement of Charge State Distributions using a Scintillation Screen
C. Marshall, Z. Meisel, F. Montes +12
Absolute cross sections measured using electromagnetic devices to separate and detect heavy recoiling ions need to be corrected for charge state fractions. Accurate prediction of c…
Measurements of the Thick Target Yield Near Threshold
K. Brandenburg, G. Hamad, Z. Meisel +11
We present results from direct measurements of the thick target yield from laboratory incident energies 35~MeV, performed with the HeBF…
Mass Measurement of P to Constrain Type-I X-ray Burst Models and Validate the IMME for the A=27, T= Isospin Quartet
I. T. Yandow, A. Abdullah-Smoot, G. Bollen +12
Light curves are the primary observable of type-I x-ray bursts. Computational x-ray burst models must match simulations to observed light curves. Most of the error in simulated cur…
Spallation-altered accreted compositions for X-ray bursts: Impact on ignition conditions and burst ashes
J. S. Randhawa, Z. Meisel, S. A. Giuliani +5
Dependable predictions of the X-ray burst ashes and light curves require a stringent constraint on the composition of the accreted material as an input parameter. Lower metallicity…
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…
Enhanced Nuclear Binding Near the Proton Dripline Opens Possible Bypass of the rp-process Waiting Point
Z. Meisel, W. -J. Ong, J. S. Randhawa
We performed astrophysics model calculations with updated nuclear data to identify a possible bypass of the waiting-point, a defining feature of the rapid-proton ca…
Direct cross-section measurement of the weak r-process 88Sr(α,n)91Zr reaction in ν-driven winds of core collapse supernovae
C. Fougères, M. L. Avila, H. Jayatissa +15
About half of the heavy elements beyond iron are known to be produced by the rapid neutron capture process, known as r-process. However, the astrophysical site producing the r-proc…
-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…
Status of the JENSA gas-jet target for experiments with rare isotope beams
K. Schmidt, K. A. Chipps, S. Ahn +12
The JENSA gas-jet target was designed for experiments with radioactive beams provided by the rare isotope re-accelerator ReA3 at the National Superconducting Cyclotron Laboratory.…
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…
First direct measurement of Cu(p,)Ni: A step towards constraining the Ni-Cu cycle in the Cosmos
J. S. Randhawa, R. Kanungo, J. Refsgaard +34
Reactions on the proton-rich nuclides drive the nucleosynthesis in Core-Collapse Supernovae (CCSNe) and in X-ray bursts (XRBs). CCSNe eject the nucleosynthesis products to the inte…
The Impact of Neutron Transfer Reactions on Heating and Cooling of Accreted Neutron Star Crusts
H. Schatz, Z. Meisel, E. F. Brown +10
Nuclear reactions heat and cool the crust of accreting neutron stars and need to be understood to interpret observations of X-ray bursts and of long-term cooling in transiently acc…
Re-analysis of the Mg()Si reaction rate at stellar temperatures
P. Adsley, A. M. Laird, Z. Meisel
The Mg()Si reaction influences the production of magnesium and silicon isotopes during carbon burning and is one of eight reaction rates found to significantly…
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…
Constraining the destruction rate of K in stellar nucleosynthesis through the study of the Ar(p,n)K reaction
P. Gastis, G. Perdikakis, J. Dissanayake +13
40K plays a significant role in the radiogenic heating of earth-like exoplanets, which can affect the development of a habitable environment on their surfaces. The initial amount o…
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…
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…
Differential cross sections for , and between = 7.2 and 10 MeV with an active-target Time Projection Chamber
J. Bishop, C. E. Parker, R. Smith +24
Data for the , and differential cross sections are important for several differen…
-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…
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…
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…