Tur, Clarisse, Heger, Alexander, Austin, Sam M.
We have studied the sensitivity to variations in the the triple alpha and 12C(a,g)16O reaction rates of the production of 26Al, 44Ti, and 60Fe in core-collapse supernovae. We used the KEPLER code to...
Cyburt, Richard H., Austin, Sam M., Beers, Timothy C., Estrade, Alfredo, Ferguson, Ryan M., Sakharuk, A., ...
The research area of nuclear astrophysics is characterized by a need for information published in tens of journals in several fields and an extremely dilute distribution of researchers. For these...
Spectroscopy of 13B via the 13C(t,3He) reaction at 115 AMeV (2009)
Guess, C. J., Zegers, R. G. T., Brown, B. A., Austin, Sam M., Bazin, D., Caesar, C., ...
Gamow-Teller and dipole transitions to final states in 13B were studied via the 13C(t,3He) reaction at Et = 115 AMeV. Besides the strong Gamow-Teller transition to the 13B ground state, a weaker...
Gamow-Teller transitions to 64-Cu measured using the 64-Zn(t,3-He) reaction (2009)
Hitt, G. W., Zegers, R. G. T., Austin, Sam M., Bazin, D., Gade, A., Galaviz, D., ...
The 64-Zn(t,3-He) reaction has been studied using a secondary triton beam of 115 MeV/nucleon to extract the Gamow-Teller transition-strength distribution to 64-Cu. The results were compared with...
Tur, Clarisse, Heger, Alexander, Austin, Sam M.
We have studied the sensitivity of s-process nucleosynthesis in massive stars to +/- 2sigma variations in the rates of the triple alpha and 12C(a,g)16O reactions. We simulated the evolution of...
Gamow-Teller strengths in 24Na using the 24Mg(t,3He) reaction at 115 AMeV (2008)
Howard, M. E., Zegers, R. G. T., Austin, Sam M., Bazin, D., Brown, B. A., Cole, A. L., ...
Gamow-Teller transitions from 24Mg to 24Na were studied via the (t,3He) reaction at 115 AMeV using a secondary triton beam produced via fast fragmentation of 150 AMeV 16O ions. Compared to previous...
Anantaraman, N., Austin, Sam M., Brown, B. A., Crawley, G. M., Galonsky, A., Zegers, R. G. T., ...
Background: The strength of electron capture for medium mass nuclei has a significant effect on the evolution of supernovae. There is insufficient knowledge of these strengths and very little data...
Zegers, R. G. T., Meharchand, R., Adachi, T., Austin, Sam M., Brown, B. A., Fujita, Y., ...
The 24Mg(3He,t)24Al reaction has been studied at E(3He)=420 MeV. An energy resolution of 35 keV was achieved. Gamow-Teller strengths to discrete levels in 24Al are extracted by using a recently...
Solar fusion cross sections (2008)
Eric G. Adelberger, Sam M. Austin, John N. Bahcall, A. B. Balantekin, Gilles Bogaert, Lowell S. Brown, ...
Zegers, R. G. T., Brown, E. F., Akimune, H., Austin, Sam M., Brown, B. A., ...
The Gamow-Teller strength for the transition from the ground state of 13C to the T=1/2, J^pi=3/2- excited state at 3.51 MeV in 13N is extracted via the 13C(3He,t) reaction at 420 MeV. In contrast to...
On the extraction of weak transition strengths via the (3He,t) reaction at 420 MeV (2007)
Zegers, R. G. T, Adachi, T., Akimune, H., Austin, Sam M., Brown, B. A., ...
Differential cross sections for transitions of known weak strength were measured with the (3He,t) reaction at 420 MeV on targets of 12C, 13C, 18O, 26Mg, 58Ni, 60Ni, 90Zr, 118Sn, 120Sn and 208Pb....
Tur, Clarisse, Heger, Alexander, Austin, Sam M.
We explore the dependence of pre-supernova evolution and supernova nucleosynthesis yields on the uncertainties in helium burning reaction rates. Using the revised solar abundances of Lodders (2003)...
Cole, A. L., Akimune, H., Austin, Sam M., Bazin, D., Berg, G. P. A., ...
Electron capture and beta decay play important roles in the evolution of pre-supernovae stars and their eventual core collapse. These rates are normally predicted through shell-model calculations....
The (t,3He) and (3He,t) reactions as probes of Gamow-Teller strength (2005)
Zegers, R. G. T., Akimune, H., Austin, Sam M., Bazin, D., Berg, G. P. A., ...
Charge-exchange reactions are an important tool for determining weak-interaction rates. They provide stringent tests for nuclear structure models necessary for modeling astrophysical environments...
Herwig, F., Austin, Sam M., Lattanzio, John C.
Calculations that demonstrate the influence of three key nuclear reaction rates on the evolution of Asymptotic Giant Branch stars have been carried out. We study the case of a star with an initial...
The triple alpha process plays an important role in the production of 12C in stars. Its rate is known with an accuracy of about 12%. We examine the corresponding uncertainties introduced in the...
Nuclear Reaction Rates and Carbon Star Formation (2004)
We have studied how the third dredge-up and the carbon star formation in low-mass Asymptotic Giant Branch stars depends on certain key nuclear reaction rates. We find from a set of complete stellar...
High Energy Approaches To Low Energy Phenomena In Astrophysics (2002)
Studies in nuclear astrophysics have long been associated with long runs at small accelerators, measuring ever-decreasing cross sections as one approached (but rarely reached) the energy of reactions...
Do Hadronic Charge Exchange Reactions Measure Electroweak L = 1 Strength? (2001)
Dmitriev, V. F., Zelevinsky, V., Austin, Sam M.
An eikonal model has been used to assess the relationship between calculated strengths for first forbidden beta decay and calculated cross sections for (p,n) charge exchange reactions. It is found...
Electromagnetic Dissociation of 8B and the Rate of the 7Be(p,gamma)8B Reaction in the Sun (2001)
Davids, B., Austin, Sam M., Bazin, D., Esbensen, H., Sherrill, B. M., Thompson, I. J., ...
In an effort to better determine the 7Be(p,gamma)8B reaction rate, we have performed inclusive and exclusive measurements of the Coulomb dissociation of 8B. The former was a study of longitudinal...
Production of A=6,7 Nuclides in the Alpha + Alpha Reaction and Cosmic Ray Nucleosynthesis (2001)
Mercer, David J., Austin, Sam M., Brown, J. A., Danczyk, S. A., Hirzebruck, S. E., Kelley, J. H., ...
Cross sections for production of 6He, 6Li, 7Li, and 7Be in the alpha+alpha reaction were measured at bombarding energies of 159.3, 279.6, and 619.8 MeV, and are found to decrease rapidly with...
S17(0) Determined from the Coulomb Breakup of 83 MeV/nucleon 8B (2001)
Davids, B., Anthony, D. W., Aumann, T., Austin, Sam M., Baumann, T., Bazin, D., ...
A kinematically complete measurement was made of the Coulomb dissociation of 8B nuclei on a Pb target at 83 MeV/nucleon. The cross section was measured at low relative energies in order to infer the...
S17(0) Determined from the Coulomb Breakup of 83 MeV/Nucleon 8B (2001)
Anthony, D. W., Aumann, T., Austin, Sam M., Baumann, T., Davids, B.
Splitting of the Dipole and Spin-Dipole Resonances (2000)
Austin, Sam M., Adamides, E., Galonsky, A., Nees, T., Sterrenburg, W. A., Bainum, D. E., ...
Cross sections for the 90,92,94Zr(p,n) reactions were measured at energies of 79.2 and 119.4 MeV. A phenomenological model was developed to describe the variation with bombarding energy of the...
Solar fusion cross sections (1998)
Adelberger, Eric G., Austin, Sam M., Bahcall, John N., Balantekin, A. B., Bogaert, Gilles, Brown, Lowell S., ...
We review and analyze the available information on the nuclear-fusion cross sections that are most important for solar energy generation and solar neutrino production. We provide best values for the...
Measurement of E2 Transitions in the Coulomb Dissociation of 8B (1998)
Davids, B., Anthony, D. W., Austin, Sam M., Bazin, D., Blank, B., Caggiano, J. A., ...
In an effort to understand the implications of Coulomb dissociation experiments for the determination of the 7Be(p,gamma)8B reaction rate, longitudinal momentum distributions of 7Be fragments...
Conference on the p,n Reaction and the Nucleon-nucleon Force (1990)
Austin, Sam M, Bloom, Stewart D, Goodman, Charles D, Rapaport, J, Satchler, George Raymond
Search for high excitation energy structures in 90Zr and 208Pb, via 20Ne inelastic scattering (1987)
Plicht, J. Van Der, Lee, J.H., Djalali, C., Crawley, G.M., Benenson, W., Austin, Sam M., ...
The inelastic scattering of 20Ne on 90Zr and 208Pb has been studied at 500 and 600 MeV incident energies. High statistics spectra were measured at the grazing angle. For each target, spectra at the...
Chang, C.C., Plicht, J. Van Der, Galonsky, A., Chen, Ziping, Austin, Sam M., ...
Angular distributions have been measured for the (6Li, 6He) reaction on targets of 7Li, 12,14C, 26Mg, and 90Zr at bombarding energies of 35, 25, and 14 MeV/nudeon. The ratios of observed cross...
Mechanism of the heavy-ion charge exchange reaction 12C(12C, 12N)12B at 35 MeV/nucleon (1986)
Zeller, A.F., Plicht, J. Van Der, Austin, Sam M., Harwood, L.H., Anantaraman, N., ...
The heavy-ion charge exchange reaction 12C(12C,12N)12B has been studied at E(12C)=35 MeV/nucleon. Angular distributions in the range 3.7-12.1° (c.m.) have been measured for the 1+ (0.0 MeV), 2+...
(6Li, 6He) Reaction as a Probe of Spin-Transfer Strength (1986)
Plicht, J. Van Der, Galonsky, A., Austin, Sam M., Winfield, J.S., Anantaraman, N., Chang, C.C., ...
The (6Li,6He) reaction was studied on targets of 7Li, 12C, 14C, 26Mg, and 90Zr at ELi=210 MeV. A striking proportionality between cross sections for Gamow-Teller transitions and the corresponding...
The 20-Ne(p,n)20-Na Reaction at 120 MeV (1982)
DeVito, R.P., Foster, C.C., Goodman, C.D., Taddeucci, T.N., Austin, Sam M., Galonsky, Aaron, ...
This work was supported by the National Science Foundation Grant NSF PHY 81-14339 and by Indiana University
Austin, Sam M., Madey, R., Watson, J.W., Anderson, B.D., Baldwin, A.R., Flanders, B.S., ...
This work was supported by the National Science Foundation Grant NSF PHY 81-14339 and by Indiana University
The 20-Ne(p,n)20-Na Reaction at 120 MeV (1982)
DeVito, R.P., Foster, C.C., Goodman, C.D., Taddeucci, T.N., Austin, Sam M., Galonsky, Aaron, ...
This work was supported by the National Science Foundation Grant NSF PHY 81-14339 and by Indiana University
Austin, Sam M., Madey, R., Watson, J.W., Anderson, B.D., Baldwin, A.R., Flanders, B.S., ...
This work was supported by the National Science Foundation Grant NSF PHY 81-14339 and by Indiana University
Wolk, C. Peter, Austin, Sam M., Bortins, John, Galonsky, Aaron
13N, generated by proton bombardment of 13C powder, is rapidly and easily converted to 13N-N2, 0.01 atm pressure, ca. 10 mCi/ml, by automated Dumas combustion. 13N fixed (as 13N-N2) by algal...