Publications (20)
Evidence for the ground-state resonance of 26O
E. Lunderberg, P. A. DeYoung, Z. Kohley +18
Evidence for the ground state of the neutron-unbound nucleus 26O was observed for the first time in the single proton-knockout reaction from a 82 MeV/u 27F beam. Neutrons were meas…
Enhanced production of 60Fe in massive stars
A. Spyrou, D. Richman, A. Couture +23
Massive stars are a major source of chemical elements in the cosmos, ejecting freshly produced nuclei through winds and core-collapse supernova explosions into the interstellar med…
Measurement of the Pu(n,f)/U(n,f) Cross-Section Ratio with the NIFFTE fission Time Projection Chamber
L. Snyder, M. Anastasiou, N. S. Bowden +37
The Pu(n,f)/U(n,f) cross-section ratio has been measured with the fission Time Projection Chamber (fissionTPC) from 100 keV to 100 MeV. The fissionTPC provides thre…
Study of two-neutron radioactivity in the decay of 26O
Z. Kohley, T. Baumann, D. Bazin +12
A new technique was developed to measure the lifetimes of neutron unbound nuclei in the picosecond range. The decay of 26O -> 24O+n+n was examined as it had been predicted to have…
Exploring the Low- Shore of the Island of Inversion at
G. Christian, N. Frank, S. Ash +24
The technique of invariant mass spectroscopy has been used to measure, for the first time, the ground state energy of neutron-unbound determined to be a resonanc…
Three-body correlations in the ground-state decay of 26O
Z. Kohley, T. Baumann, G. Christian +10
Background: Theoretical calculations have shown that the energy and angular correlations in the three-body decay of the two-neutron unbound O26 can provide information on the groun…
1H(n,el) as a Cross Section Reference in a White Source Neutron Beam With the fissionTPC
N. I. Walsh, J. T. Barker, N. S. Bowden +33
We provide a quantitative description of a method to measure neutron-induced fission cross sections in ratio to elastic hydrogen scattering in a white-source neutron beam with the…
First observation of Li ground state
Z. Kohley, E. Lunderberg, P. A. DeYoung +16
The ground state of neutron-rich unbound Li was observed for the first time in a one-proton removal reaction from Be at a beam energy of 53.6 MeV/u. The Li gro…
Neutron Induced Fission Fragment Angular Distributions, Anisotropy, and Linear Momentum Transfer Measured with the NIFFTE Fission Time Projection Chamber
D. Hensle, J. T. Barker, J. S. Barrett +46
The Neutron Induced Fission Fragment Tracking Experiment (NIFFTE) collaboration has performed measurements with a fission time projection chamber (fissionTPC) to study the fission…
Search for C and constraints on C
S. Mosby, N. S. Badger, T. Baumann +20
A search for the neutron-unbound nucleus C was performed via the single proton removal reaction from a beam of 22 N at 68 MeV/u. Neutrons were detected with the Modular Neut…
Exploring the neutron dripline two neutrons at a time: The first observations of the 26O and 16Be ground state resonances
Z. Kohley, A. Spyrou, E. Lunderberg +22
The two-neutron unbound ground state resonances of O and Be were populated using one-proton knockout reactions from F and B beams. A coincidence measure…
Observation of Ground-State Two-Neutron Decay
M. Thoennessen, Z. Kohley, A. Spyrou +22
Neutron decay spectroscopy has become a successful tool to explore nuclear properties of nuclei with the largest neutron-to-proton ratios. Resonances in nuclei located beyond the n…
Search for unbound 15Be states in the 3n+12Be channel
A. N. Kuchera, A. Spyrou, J. K. Smith +10
15Be is expected to have low-lying 3/2+ and 5/2+ states. A first search did not observe the 3/2+ [A. Spyrou et al., Phys. Rev. C 84, 044309 (2011)], however, a resonance in 15Be wa…
Observation of a low-lying neutron-unbound state in 19C
M. Thoennessen, S. Mosby, N. S. Badger +16
Proton removal reactions from a secondary 22N beam were utilized to populate unbound states in neutron-rich carbon isotopes. Neutrons were measured with the Modular Neutron Array (…
Spectroscopy of neutron-unbound F
G. Christian, N. Frank, S. Ash +16
The ground state of F has been observed as an unbound resonance keV above the ground state of F. Comparison of this result with USDA/USDB shell mode…
Meaurement of spin vs. TKE of Ba produced in spontaneous fission of Cf
N. P. Giha, S. Marin, I. A. Tolstukhin +21
We measure the average spin of Ba, a common fragment produced in Cf(sf), as a function of the total kinetic energy (TKE). We combined for the first time a twin Fris…
Measurement of material isotopics and atom number ratio with alpha-particle spectroscopy for the NIFFTE fission Time Projection Chamber actinide target
M. Monterial, K. T. Schmitt, C. Prokop +37
We present the results of a measurement of isotopic concentrations and atomic number ratio of a double-sided actinide target with alpha-spectroscopy and mass spectrometry. The doub…
Properties of correlated fission fragments from neutron induced fission of Np-237 at incident neutron energies between 200 keV and 100 MeV
D. Connolly, K. B. Montoya, D. L. Duke +7
Neutron-induced fission of Np has been measured over a wide range of incident neutron energies using a twin Frisch-gridded ionization chamber (TFGIC) and a thin-backed $^{2…
Enhanced low-energy -decay strength of Ni and its robustness within the shell model
A. C. Larsen, J. E. Midtbø, M. Guttormsen +19
Neutron-capture reactions on very neutron-rich nuclei are essential for heavy-element nucleosynthesis through the rapid neutron-capture process, now shown to take place in neutron-…
Isotopically resolved neutron total cross sections at intermediate energies
C. D. Pruitt, R. J. Charity, L. G. Sobotka +9
The neutron total cross sections of O, Ni, Rh, and Sn have been measured at the Los Alamos Neutron Science Center (LANSCE) from l…