S. Stave
Duke University
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Featured researches published by S. Stave.
Physical Review Letters | 2013
W.R. Zimmerman; M. W. Ahmed; B. Bromberger; S. Stave; A. Breskin; V. Dangendorf; Thierry Delbar; M. Gai; S.S. Henshaw; J. M. Mueller; C. Sun; K. Tittelmeier; H. R. Weller; Y. Wu
The second J(π)=2+ state of 12C, predicted over 50 years ago as an excitation of the Hoyle state, has been unambiguously identified using the 12C(γ,α0)(8)Be reaction. The alpha particles produced by the photodisintegration of 12C were detected using an optical time projection chamber. Data were collected at beam energies between 9.1 and 10.7 MeV using the intense nearly monoenergetic gamma-ray beams at the HIγS facility. The measured angular distributions determine the cross section and the E1-E2 relative phases as a function of energy leading to an unambiguous identification of the second 2+ state in 12C at 10.03(11) MeV, with a total width of 800(130) keV and a ground state gamma-decay width of 60(10) meV; B(E2:2(2)+→0(1)+)=0.73(13)e(2) fm(4) [or 0.45(8) W.u.]. The Hoyle state and its rotational 2+ state that are more extended than the ground state of 12C presents a challenge and constraints for models attempting to reveal the nature of three alpha-particle states in 12C. Specifically, it challenges the ab initio lattice effective field theory calculations that predict similar rms radii for the ground state and the Hoyle state.
Physical Review Letters | 2014
L.S. Myers; J. R. M. Annand; J. Brudvik; G. Feldman; Kevin Fissum; Harald W. Grießhammer; Kurt Hansen; Seth S. Henshaw; L. Isaksson; R. Jebali; M. A. Kovash; Magnus Lundin; Judith A. McGovern; D. G. Middleton; Alan M. Nathan; Daniel R. Phillips; Bent Schröder; S. Stave
The electromagnetic polarizabilities of the nucleon are fundamental properties that describe its response to external electric and magnetic fields. They can be extracted from Compton-scattering data-and have been, with good accuracy, in the case of the proton. In contradistinction, information for the neutron requires the use of Compton scattering from nuclear targets. Here, we report a new measurement of elastic photon scattering from deuterium using quasimonoenergetic tagged photons at the MAX IV Laboratory in Lund, Sweden. These first new data in more than a decade effectively double the world data set. Their energy range overlaps with previous experiments and extends it by 20 MeV to higher energies. An analysis using chiral effective field theory with dynamical Δ(1232) degrees of freedom shows the data are consistent with and within the world data set. After demonstrating that the fit is consistent with the Baldin sum rule, extracting values for the isoscalar nucleon polarizabilities, and combining them with a recent result for the proton, we obtain the neutron polarizabilities as αn=[11.55±1.25(stat)±0.2(BSR)±0.8(th)]×10(-4) fm(3) and βn=[3.65∓1.25(stat)±0.2(BSR)∓0.8(th)]×10(-4) fm(3), with χ(2)=45.2 for 44 degrees of freedom.
Annual Review of Nuclear and Particle Science | 2009
Aron M. Bernstein; M. W. Ahmed; S. Stave; Y. Wu; H. R. Weller
We review photopion experiments on the nucleon in the near-threshold region. We compare the results with the predictions of the low-energy theorems of quantum chromodynamics calculated using chiral perturbation theory (ChPT), which is based on the spontaneous breaking of chiral symmetry as well as explicit breaking due to the finite quark masses. As a result of the vanishing of the threshold amplitudes in the chiral limit, the experiments are difficult to perform because the cross sections are small. Nevertheless, the field is now mature in terms of accuracy and sensitivity. We also discuss the accomplishments and limitations of past measurements, as well as future planned experiments at Mainz and HIγS. The technical developments required for the HIγS facility are emphasized. Finally, we show that future experiments will provide even more accurate tests of ChPT and will be sensitive to isospin-breaking dynamics due to the mass difference between the up and down quarks.
Physics Letters B | 2006
N. F. Sparveris; P. Achenbach; C. Ayerbe Gayoso; D. Baumann; J. C. Bernauer; Aron M. Bernstein; R. Böhm; D. Bosnar; T. Botto; A. Christopoulou; D. Dale; M. Ding; M. O. Distler; L. Doria; J. Friedrich; A. Karabarbounis; M. Makek; H. Merkel; U. Müller; I. Nakagawa; R. Neuhausen; L. Nungesser; C. N. Papanicolas; A. Piegsa; J. Pochodzalla; M. Potokar; M. Seimetz; S. Širca; S. Stave; S. Stiliaris
We report new precise p
Few-body Systems | 2007
A. M. Bernstein; S. Stave
(\vec{e},e^\prime p)\pi^0
Physical Review C | 2015
L.S. Myers; John Annand; J. Brudvik; G. Feldman; Kevin Fissum; Harald W. Grießhammer; Kurt Hansen; Seth S. Henshaw; L. Isaksson; R. Jebali; M. A. Kovash; Magnus Lundin; D. G. Middleton; Alan M. Nathan; Bent Schröder; S. Stave
measurements at the peak of the
Physical Review C | 2014
L.S. Myers; K. Shoniyozov; M. F. Preston; J. R. M. Annand; M. Boselli; W. J. Briscoe; J. Brudvik; J. I. Capone; G. Feldman; Kevin Fissum; K. Hansen; Seth S. Henshaw; L. Isaksson; R. Jebali; M. A. Kovash; K. Lewis; Magnus Lundin; I. J. D. MacGregor; D. G. Middleton; D. E. Mittelberger; M. Murray; Alan M. Nathan; S. Nutbeam; G.V. O'Rielly; Bent Schröder; B. Seitz; S. Stave; H. R. Weller
\Delta^{+}(1232)
Proceedings of The 8th International Workshop on Chiral Dynamics — PoS(CD15) | 2016
G. Feldman; L.S. Myers; J. R. M. Annand; J. Brudvik; Kevin Fissum; Harald W. Griesshammer; K. Hansen; Seth S. Henshaw; L. Isaksson; M. A. Kovash; Magnus Lundin; Judith A. McGovern; Alan M. Nathan; Daniel R. Phillips; Bent Schröder; K. Shoniyozov; S. Stave
resonance at
21st International Conference on Application of Accelerators in Research and Industry, CAARI 2010 | 2011
Micah Johnson; James M. Hall; Dennis Paul McNabb; Michael J. Tuffley; Mohammed W. Ahmed; S. Stave; H. R. Weller; H. J. Karwowski; Jeromy Thompkins
Q^2=\unit[0.20](GeV/c)^2
ieee nuclear science symposium | 2008
Glen A. Warren; Joseph A. Caggiano; M. W. Ahmed; W. Bertozzi; A. W. Hunt; James T. Johnson; James L. Jones; Steve Korbly; Edward T.E. Reedy; Heather A. Seipel; S. Stave; Scott M. Watson; H. R. Weller
performed at the Mainz Microtron (MAMI). The new data are sensitive to both the electric quadrupole (