Publications of Mohammad W. Ahmed :chronological combined listing:
%% Books
@book{fds52396,
Author = {Editors: M.W. Ahmed and B. Holstein and H. Gao and H.R.
Weller},
Title = {Chiral Dynamics 2006},
Publisher = {World Scientific},
Year = {2007},
ISBN = {13978-981-270-566-2},
Key = {fds52396}
}
%% Papers Published
@article{fds43813,
Author = {S. O. Nelson et al.},
Title = {Analyzing power measurement for the 14N(p-vector,gamma)15O
reaction at astrophysically relevant energies},
Journal = {Phys. Rev. C},
Volume = {68},
Pages = {065804},
Year = {2003},
Key = {fds43813}
}
@article{fds245035,
Author = {Nelson, SO and Ahmed, MW and Perdue, BA and Sabourov, K and Sabourov, A and Tonchev, AP and Prior, RM and Spraker, M and Weller,
HR},
Title = {Analyzing Power Measurements for the 14N(p,g)15O Reaction at
Astrophysically Relevant Energies},
Journal = {Physical Review C},
Volume = {C68},
Pages = {065804},
Publisher = {APS},
Year = {2003},
Month = {December},
url = {http://aps.org/},
Key = {fds245035}
}
@article{fds245031,
Author = {Sabourov, A and Ahmed, MW and Blackston, MA and Crowell, AS and Howell,
CR and Perdue, BA and Sabourov, K and Tonchev, A and Weller, HR and Prior,
RM and Spraker, MC},
Title = {Astrophysical S factor for the ( ) and ( )
reactions},
Journal = {Physical Review C - Nuclear Physics},
Volume = {73},
Number = {1},
Pages = {015801},
Year = {2006},
Month = {January},
url = {http://dx.doi.org/10.1103/PhysRevC.73.015801},
Abstract = {The absolute astrophysical S factor and cross section for
the Li7(d,n0)Be8 and Li7(d,n1)Be8 reactions have been
determined using deuteron beams with energies between 45 and
80 keV. The slope of the S factor is consistent with zero in
the n0 case but is slightly negative in the n1 case. The S
factor for the sum of both neutron groups at c.m. energies
below 70 keV is S(E)=5400(±1500)-37(±21)E keV b, where E
is the c.m. energy in keV. © 2006 The American Physical
Society.},
Doi = {10.1103/PhysRevC.73.015801},
Key = {fds245031}
}
@article{fds245032,
Author = {Parpottas, Y and Ahmed, MW and Blackston, MA and III, FRH and Perdue,
BA and Prior, RM and Sabourov, A and Spraker, MC and Weller,
HR},
Title = {Astrophysical S factor for the B-11(d, n)C-12 reaction below
135 keV},
Journal = {Physical Review C - Nuclear Physics},
Volume = {74},
Number = {1},
Pages = {015804},
Year = {2006},
Month = {July},
ISSN = {0556-2813},
url = {http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000239511600055&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=47d3190e77e5a3a53558812f597b0b92},
Doi = {10.1103/PhysRevC.74.015804},
Key = {fds245032}
}
@article{fds245033,
Author = {Ahmed, MW and Feldman, G and Litvinenko, VN and Nelson, SO and Norum,
BE and Perdue, B and Pinayev, IV and Sawatzky, B and Tonchev, AP and Wu, Y and Weller, HR},
Title = {Background reduction in FEL-generated γ-ray beam
experiments using giant high-peak power pulses},
Journal = {Nuclear Instruments and Methods in Physics Research Section
A: Accelerators, Spectrometers, Detectors and Associated
Equipment},
Volume = {516},
Number = {2-3},
Pages = {440-444},
Year = {2004},
Month = {January},
ISSN = {0168-9002},
url = {http://dx.doi.org/10.1016/j.nima.2003.08.166},
Abstract = {A new method to eliminate beam-uncorrelated background in
photonuclear experiments has been developed at the High
Intensity Gamma-Ray Source (HIγS). Background suppression
of over 3 orders-of-magnitude has been achieved by using a
gain modulation technique to generate giant high-peak power
(GHPP) pulses in the OK-4/ Duke storage ring FEL. The time
structure of these laser pulses was tuned so that their
duration was ∼100 μs, repeated every 50 ms. The
associated FEL photons were backscattered from 780 MeV
electrons to produce linearly polarized 40 MeV γ-rays
having the same time structure as the FEL pulses. As an
initial test of the technique, a nearly background-free
measurement of the analyzing power in the Compton scattering
reaction 16O(γ→,γ)16O was performed. © 2003 Elsevier
B.V. All rights reserved.},
Doi = {10.1016/j.nima.2003.08.166},
Key = {fds245033}
}
@article{fds245024,
Author = {Bernstein, AM and Ahmed, MW and Stave, S and Wu, YK and Weller,
HR},
Title = {Chiral dynamics in photopion physics: Theory, experiment,
and future studies at the HIγS facility},
Journal = {Annual Review of Nuclear and Particle Science},
Volume = {59},
Pages = {115-144},
Year = {2009},
ISSN = {0163-8998},
url = {http://dx.doi.org/10.1146/annurev.nucl.010909.083220},
Abstract = {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. Copyright © 2009 by Annual Reviews. All rights
reserved.},
Doi = {10.1146/annurev.nucl.010909.083220},
Key = {fds245024}
}
@article{fds167648,
Author = {Aron Bernstein and Mohammad W. Ahmed and Sean Stave and Ying K. Wu and Henry R. Weller},
Title = {Chiral Dynamics in Photo‐Pion Physics: Theory, Experiment,
and Future Studies at the HIGS Facility},
Journal = {Annual Reviews of Nuclear and Particle Physics},
Volume = {59},
Pages = {115‐44},
Year = {2009},
Key = {fds167648}
}
@article{fds245023,
Author = {Pietralla, N and Li, TC and Fritzsche, M and Ahmed, MW and Ahn, T and Costin, A and Enders, J and Li, J and Müller, S and von Neumann-Cosel,
P and Pinayev, IV and Ponomarev, VY and Savran, D and Tonchev, AP and Tornow, W and Weller, HR and Werner, V and Wu, YK and Zilges,
A},
Title = {Competition between excited core states and 1ℏω
single-particle excitations at comparable energies in 207Pb
from photon scattering},
Journal = {Physics Letters B},
Volume = {681},
Number = {2},
Pages = {134-138},
Year = {2009},
Month = {October},
ISSN = {0370-2693},
url = {http://dx.doi.org/10.1016/j.physletb.2009.09.059},
Abstract = {The Pb (over(γ, →), γ′) photon scattering reaction has
been studied with the nearly monochromatic, linearly
polarized photon beams at the High Intensity γ-ray Source
(HIγS) at the DFELL. Azimuthal scattering intensity
asymmetries measured with respect to the polarization plane
of the beam have been used for the first time to assign both
the spin and parity quantum numbers of dipole excited states
of 206,207,208Pb at excitation energies in the vicinity of
5.5 MeV. Evidence for dominant particle-core coupling is
deduced from these results along with information on
excitation energies and electromagnetic transition matrix
elements. Implications of the existence of weakly coupled
states built on highly excited core states in competition
with 1 ℏ ω single particle (hole) excitations at
comparable energies are discussed. © 2009 Elsevier B.V. All
rights reserved.},
Doi = {10.1016/j.physletb.2009.09.059},
Key = {fds245023}
}
@article{fds245016,
Author = {al, LSMMWAE},
Title = {Compton Scattering from 6Li},
Journal = {Physical Review},
Volume = {C 86},
Pages = {044614},
Year = {2012},
Key = {fds245016}
}
@article{fds43804,
Author = {B. A. Perdue et al.},
Title = {Compton scattering of polarized gamma rays by 16O for Egamma
= 25–40 MeV},
Journal = {Phys. Rev. C 70, 064305 (2004)},
Volume = {70},
Pages = {064305},
Year = {2004},
Key = {fds43804}
}
@article{fds245025,
Author = {Stave, S and Ahmed, MW and Antolak, AJ and Blackston, MA and Crowell,
AS and Doyle, BL and Henshaw, SS and Howell, CR and Kingsberry, P and Perdue, BA and Rossi, P and Prior, RM and Spraker, MC and Weller,
HR},
Title = {Cross section measurements of the B10(d,n0)C11 reaction
below 160 keV},
Journal = {Physical Review C - Nuclear Physics},
Volume = {77},
Number = {5},
Pages = {054607},
Year = {2008},
ISSN = {0556-2813},
url = {http://dx.doi.org/10.1103/PhysRevC.77.054607},
Abstract = {New data were taken at the Triangle Universities Nuclear
Laboratory to investigate the plausibility of using low
energy deuterons and the B10(d,n)C11 reaction as a portable
source of 6.3 MeV neutrons. Analysis of the data at and
below incident deuteron energies of 160 keV indicates an n0
neutron cross section that is lower than previous estimates
by at least three orders of magnitude. In separate runs,
deuterons with two different energies (160 and 140 keV) were
stopped in a B10 target. The resulting n0 neutrons of
approximately 6.3 MeV were detected at angles between 0°
and 150°. The angle integrated yields were used to
determine the astrophysical S factor for this reaction
assuming a constant value for the S factor below 160 keV.
The cross sections reported between 130 and 160 keV were
calculated using the extracted value of the S factor. The
measured n0 cross section is several orders of magnitude
smaller than previous results, thus eliminating B10(d,n)C11
as a portable source of intense neutrons with low energy
deuteron beams on the order of tens of microamps. In order
to gain insight into the reaction dynamics at these low
energies the cross section results have been compared with
results from calculations using the distorted wave Born
approximation (DWBA) and a detailed Hauser-Feshbach
calculation performed by the authors. The angular
distribution is consistent with the Hauser-Feshbach
calculation suggesting a statistical compound nucleus
reaction rather than a direct reaction. © 2008 The American
Physical Society.},
Doi = {10.1103/PhysRevC.77.054607},
Key = {fds245025}
}
@article{fds245018,
Author = {Perdue, BA and Ahmed, MW and Henshaw, SS and Seo, P-N and Stave, S and Weller, HR and Martel, PP and Teymurazyan, A},
Title = {Cross sections for the three-body photodisintegration of
He-3 at E-gamma=12.8, 13.5, and 14.7 MeV},
Journal = {Physical Review C - Nuclear Physics},
Volume = {83},
Number = {3},
Pages = {034003},
Year = {2011},
Month = {March},
ISSN = {0556-2813},
url = {http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000288213000002&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=47d3190e77e5a3a53558812f597b0b92},
Doi = {10.1103/PhysRevC.83.034003},
Key = {fds245018}
}
@article{fds245038,
Author = {Ahmed, MW and Cui, X and Empl, A and Hungerford, EV and Lan, KJ and Youn,
M and Chrien, RE and Gill, R and Pile, P and Rusek, A and Sutter, R and Bjoraker, J and Dehnhard, D and O'Donnell, JM and Gerald, J and Juengst,
H and Liu, JH and Peng, JC and Morris, CL and Riedel, CM and Thiessen, HA and Androic, D and Bertovic, I and Furic, M and Petkovic, T and Planinic, M and Tang, L and Zeps, V},
Title = {Experimental study of the C-12(K-stopped(-),
(pi)0)(Lambda)B-12 reaction},
Journal = {Physical Review C - Nuclear Physics},
Volume = {68},
Number = {6},
Pages = {064004},
Year = {2003},
Month = {December},
ISSN = {0556-2813},
url = {http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000188769500012&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=47d3190e77e5a3a53558812f597b0b92},
Doi = {10.1103/PhysRevC.68.064004},
Key = {fds245038}
}
@article{fds245029,
Author = {Li, TC and Pietralla, N and Tonchev, AP and Ahmed, MW and Ahn, T and Angell, C and Blackston, MA and Costin, A and Keeter, KJ and Li, J and Lisetskiy, A and Mikhailov, S and Parpottas, Y and Perdue, BA and Rainovski, G and Tornow, W and Weller, HR and Wu,
YK},
Title = {First evidence for spin-flip strength in},
Journal = {Physical Review C - Nuclear Physics},
Volume = {73},
Number = {5},
Pages = {054306},
Year = {2006},
Month = {May},
ISSN = {0556-2813},
url = {http://dx.doi.org/10.1103/PhysRevC.73.054306},
Abstract = {The Ar40(γ→,γ′) photon scattering reaction was used to
search for spin-flip M1 strength in Ar40. The nearly
monochromatic, linearly polarized photon beam of HIγS, in
an energy region from 7.7 to 11 MeV, was employed in this
study. 28 dipole excitations were observed. The azimuthal
intensity asymmetry indicated that all of these states were
E1 except for the state at Ex=9.757 MeV. Shell-model
calculations were used to interpret this state as one
fragment of the spin-flip M1 strength in Ar40. © 2006 The
American Physical Society.},
Doi = {10.1103/PhysRevC.73.054306},
Key = {fds245029}
}
@article{fds245026,
Author = {Perdue, MABMWABA and Pywell, HRWBBRE and Norum, WAWRISKB and Sawatzky, KWJLSFMVGPYKWBD},
Title = {First observation of the splittings of the E1 p-wave
amplitudes in low energy deuteron photodisintegration and
its implications for the Gerasimov-Drell-Hearn Sum Rule
integrand},
Journal = {Phys. Rev.},
Volume = {C78},
Number = {034003},
Year = {2008},
Key = {fds245026}
}
@article{fds245019,
Author = {Quarati, FGA and Owens, A and Dorenbos, P and Haas, JTMD and Benzoni, G and Blasi, N and Boiano, C and Brambilla, S and Camera, F and Alba, R and Bellia, G and Maiolino, C and Santonocito, D and Ahmed, M and Brown, N and Stave, S and Weller, HR and Wu, YK},
Title = {High energy gamma-ray spectroscopy with LaBr3
scintillation detectors},
Journal = {Nuclear Instruments and Methods in Physics Research Section
A: Accelerators, Spectrometers, Detectors and Associated
Equipment},
Volume = {629},
Number = {1},
Pages = {157-169},
Year = {2011},
ISSN = {0168-9002},
url = {http://dx.doi.org/10.1016/j.nima.2010.11.035},
Abstract = {Lanthanum bromide scintillation detectors produce very high
light outputs (∼60,000 ph/MeV) within a very short decay
time (typically ∼20 ns) which means that high
instantaneous currents can be generated in the photocathode
and dynode chain of the photomultiplier tube (PMT) used for
the scintillation readout. The net result is that signal
saturation can occur long before the recommended PMT biasing
conditions can be reached. In search of an optimized light
readout system for LaBr3, we have tested and compared two
different PMT configurations for detection of gamma-rays up
to 15 MeV. This range was chosen as being appropriate for
gamma-ray remote sensing and medium energy nuclear physics
applications. The experiments were conducted at two
facilities: the Laboratori Nazionali del Sud (LNS) in
Catania, Italy [1] and the High Intensity Gamma-ray Source
(HIγS) at Triangle University Nuclear Laboratory, in
Durham, North Carolina, USA [2]. The PMT configurations we
have tested are (1) a standard dynode chain operated
under-biased; (2) a 4-stage reduced chain operated at
nominal inter-dynode bias. The results are that shortening
the number of active stages, as in configuration (2), has
advantages in preserving energy resolution and avoiding PMT
saturation over a large energy range. However, the use of an
under-biased PMT, configuration (1), can still be considered
a satisfactory solution, at least in the case of PMTs
manufactured by Photonis. The results of this study will be
used in support of the Mercury Gamma-ray and Neutron
Spectrometer (MGNS) on board of BepiColombo, the joint
ESA/JAXA mission to Mercury, scheduled for launch in 2014.
© 2010 Elsevier B.V. All rights reserved.},
Doi = {10.1016/j.nima.2010.11.035},
Key = {fds245019}
}
@article{fds245014,
Author = {Mueller, JM and Ahmed, MW and Davis, B and Hall, JM and Henshaw, SS and Johnson, MS and Karwowski, HJ and Markoff, D and Myers, LS and Perdue,
BA and Stave, S and Tompkins, JR and Tuffley, MJ and Weller,
HR},
Title = {Measurement of prompt neutron polarization asymmetries in
photofission of U-235,U-238, Pu-239, and
Th-232},
Journal = {Physical Review C - Nuclear Physics},
Volume = {85},
Number = {1},
Pages = {014605},
Year = {2012},
Month = {January},
ISSN = {0556-2813},
url = {http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000298988500003&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=47d3190e77e5a3a53558812f597b0b92},
Doi = {10.1103/PhysRevC.85.014605},
Key = {fds245014}
}
@article{fds245021,
Author = {Wurtz, WA and Pywell, RE and Norum, BE and Kucuker, S and Sawatzky, BD and Weller, HR and Ahmed, MW and Stave, S},
Title = {Measurement of the absolute and differential cross sections
for Li-7(gamma,n(0))Li-6},
Journal = {Physical Review C - Nuclear Physics},
Volume = {84},
Number = {4},
Pages = {044601},
Year = {2011},
Month = {October},
ISSN = {0556-2813},
url = {http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000295540300002&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=47d3190e77e5a3a53558812f597b0b92},
Doi = {10.1103/PhysRevC.84.044601},
Key = {fds245021}
}
@article{fds245022,
Author = {Henshaw, SS and Ahmed, MW and Feldman, G and Nathan, AM and Weller,
HR},
Title = {New method for precise determination of the isovector giant
quadrupole resonances in nuclei.},
Journal = {Physical Review Letters},
Volume = {107},
Number = {22},
Pages = {222501},
Year = {2011},
Month = {November},
url = {http://www.ncbi.nlm.nih.gov/pubmed/22182024},
Abstract = {The intense, nearly monoenergetic, 100% polarized γ-ray
beams available at the HIγS facility, along with the
realization that the E1-E2 interference term that appears in
the Compton scattering polarization observable has opposite
signs in the forward and backward angles, make it possible
to obtain an order-of-magnitude improvement in the
determination of the parameters of the isovector giant
quadrupole resonance (IVGQR). Accurate IVGQR parameters will
lead to a more detailed knowledge of the symmetry energy in
the nuclear equation of state which is important for
understanding nuclear matter under extreme conditions such
as those present in neutron stars. Our new method is
demonstrated for the case of (209)Bi.},
Doi = {10.1103/PhysRevLett.107.222501},
Key = {fds245022}
}
@article{fds245039,
Author = {Savran, D and Müller, S and Zilges, A and Babilon, M and Ahmed, MW and Kelley, JH and Tonchev, A and Tornow, W and Weller, HR and Pietralla, N and Li, J and Pinayev, IV and Wu, YK},
Title = {Parity assignments in using polarized photons and the K
quantum number in rare earth nuclei},
Journal = {Physical Review C - Nuclear Physics},
Volume = {71},
Number = {3},
Pages = {034304},
Year = {2005},
Month = {March},
ISSN = {0556-2813},
url = {http://hdl.handle.net/10161/11080 Duke open
access},
Abstract = {The 100% polarized photon beam at the high intensity γ ray
source (HIγS) at Duke University has been used to determine
the parity of six dipole excitations between 2.9 and 3.6 MeV
in the deformed nuclei 172,174Yb in photon scattering (γ
→, γ′) experiments. The measured parities are compared
with previous assignments based on the K quantum number that
had been assigned in nuclear resonance fluorescence (NRF)
experiments by using the Alaga rules. A systematic survey of
the relation between γ-decay branching ratios and parity
quantum numbers is given for the rare earth nuclei. © 2005
The American Physical Society.},
Doi = {10.1103/PhysRevC.71.034304},
Key = {fds245039}
}
@article{fds245036,
Author = {Fransen, C and Pietralla, N and Tonchev, AP and Ahmed, MW and Chen, J and Feldman, G and Kneissl, U and Li, J and Litvinenko, VN and Perdue, B and Pinayev, IV and Pitz, HH and Prior, R and Sabourov, K and Spraker, M and Tornow, W and Weller, HR and Werner, V and Wu, YK and Yates,
SW},
Title = {Parity assignments to strong dipole excitations of
and},
Journal = {Physical Review C - Nuclear Physics},
Volume = {70},
Number = {4},
Pages = {044317},
Year = {2004},
Month = {October},
ISSN = {0556-2813},
url = {http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000225043100035&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=47d3190e77e5a3a53558812f597b0b92},
Doi = {10.1103/PhysRevC.70.044317},
Key = {fds245036}
}
@article{fds245037,
Author = {Pietralla, N and Berant, Z and Litvinenko, VN and Hartman, S and Mikhailov, FF and Pinayev, IV and Swift, G and Ahmed, MW and Kelley, JH and Nelson, SO and Prior, R and Sabourov, K and Tonchev, AP and Weller,
HR},
Title = {Parity measurements of nuclear levels using a
free-electron-laser generated gamma-ray beam.},
Journal = {Physical Review Letters},
Volume = {88},
Number = {1},
Pages = {012502},
Year = {2002},
Month = {January},
ISSN = {0031-9007},
url = {http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000173124800017&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=47d3190e77e5a3a53558812f597b0b92},
Abstract = {The quality and intensity of gamma rays at the High
Intensity gamma-ray Source are shown to make nuclear
resonance fluorescence studies possible at a new level of
precision and efficiency. First experiments have been
carried out using an intense (10(7) gamma/s) beam of 100%
linearly polarized, nearly monoenergetic, gamma rays on the
semimagic nucleus (138)Ba. Negative parity quantum numbers
have been assigned to 18 dipole excitations of (138)Ba
between 5.5 MeV and 6.5 MeV from azimuthal gamma-intensity
asymmetries.},
Doi = {10.1103/physrevlett.88.012502},
Key = {fds245037}
}
@article{fds245013,
Author = {Raut, R and Tornow, W and Ahmed, MW and Crowell, AS and Kelley, JH and Rusev, G and Stave, SC and Tonchev, AP},
Title = {Photodisintegration cross section of the reaction
(4)He(γ,p)(3)H between 22 and 30 MeV.},
Journal = {Physical Review Letters},
Volume = {108},
Number = {4},
Pages = {042502},
Year = {2012},
Month = {January},
url = {http://www.ncbi.nlm.nih.gov/pubmed/22400829},
Abstract = {The two-body photodisintegration cross section of (4)He into
a proton and triton was measured with monoenergetic photon
beams in 0.5 MeV energy steps between 22 and 30 MeV.
High-pressure (4)He-Xe gas scintillators of various (4)He/Xe
ratios served as targets and detectors. Pure Xe gas
scintillators were used for background studies. A NaI
detector together with a plastic scintillator paddle was
employed for determining the incident photon flux. Our
comprehensive data set follows the trend of the theoretical
calculations of the Trento group very well, although our
data are consistently lower in magnitude by about 5%.
However, they differ significantly from the majority of the
previous data, especially from the recent data of Shima et
al. The latter data had put into question the validity of
theoretical approaches used to calculate core-collapse
supernova explosions and big-bang nucleosynthesis abundances
of certain light nuclei.},
Doi = {10.1103/physrevlett.108.042502},
Key = {fds245013}
}
@article{fds245015,
Author = {Tornow, W and al, MWAE},
Title = {Photodisintegration cross section of the reaction
4He(g,n)3He at the giant dipole resonance peak, W. Tornow,
M. W. Ahmed et. al.},
Journal = {Physical Review},
Volume = {C 85},
Pages = {061001},
Year = {2012},
Key = {fds245015}
}
@article{fds152658,
Author = {H. R. Weller and M. W. Ahmed and H. Gao and W. Tornow and Y. K. Wu and M.
Gai and R. Miskiemen},
Title = {Research Oppertunities at the Upgraded HIGS
Facility},
Journal = {Progress in Particle and Nuclear Physics},
Volume = {62},
Pages = {257-303},
Year = {2008},
Key = {fds152658}
}
@article{fds245027,
Author = {Weller, HR and Ahmed, MW and Gao, H and Tornow, W and Wu, YK and Gai, M and Miskimen, R},
Title = {Research opportunities at the upgraded HIγS
facility},
Journal = {Progress in Particle and Nuclear Physics},
Volume = {62},
Number = {1},
Pages = {257-303},
Year = {2009},
ISSN = {0146-6410},
url = {http://dx.doi.org/10.1016/j.ppnp.2008.07.001},
Abstract = {The High Intensity γ-ray Source (HIγS) is a joint project
between the Triangle Universities Nuclear Laboratory (TUNL)
and the Duke Free Electron Laser Laboratory (DFELL). This
facility utilizes intra-cavity back-scattering of the FEL
light in order to produce intense γ-ray beams. An upgrade
which allows for the production of γ-rays up to energies of
about 100 MeV having total intensities in excess of 108/s is
essentially complete. The primary component of the upgrade
is a 1.2 GeV booster-injector which makes it possible to
replace lost electrons at full energy. In addition, an
upgrade of the present linear undulator to a helical system
has made it possible to produce nearly 100% linear and
circularly polarized beams. The full system was commissioned
in the early part of 2007. A nuclear physics research
program using beams at energies below 50 MeV commenced in
the fall of 2007. The proposed experimental program includes
low-energy studies of nuclear reactions of importance in
nuclear astrophysics as well as studies of nuclear structure
using the technique of nuclear resonance fluorescence (NRF).
Few-body nuclear physics problems will also be addressed by
studying photodisintegration of d, 3He and 4He. Future
double-polarization experiments include a study of the
Gerasimov-Drell-Hearn Sum Rule for the deuteron and 3He, and
an extensive Compton scattering program designed to probe
the internal structure of the nucleon. A major focus of
these studies will be the measurement of the electric and
magnetic polarizabilities as well as the
spin-polarizabilities of the proton and the neutron. This
review will describe the principles of operation of the
upgraded facility, followed by a description of the
performance which has been achieved to date, and a
projection of the performance anticipated in the near
future. Following this, we will review several of the
research areas of nuclear physics which are accessible using
this facility, and describe both the results to date and
proposed experiments being developed for the future. © 2008
Elsevier B.V. All rights reserved.},
Doi = {10.1016/j.ppnp.2008.07.001},
Key = {fds245027}
}
@article{fds245034,
Author = {Ahmed, M and Amann, JF and Barlow, D and Black, K and Bolton, RD and Brooks, ML and Carius, S and Chen, YK and Chernyshev, A and Concannon,
HM and Cooper, MD and Cooper, PS and Crocker, J and Dittmann, JR and Dzemidzic, M and Empl, A and Fisk, RJ and Fleet, E and Foreman, W and Gagliardi, CA and Haim, D and Hallin, A and Hoffman, CM and Hogan, GE and Hughes, EB and Hungerford, EV and Jui, CCH and Kim, GJ and Knott, JE and Koetke, DD and Kozlowski, T and Kroupa, MA and Kunselman, AR and Lan,
KA and Laptev, V and Lee, D and Liu, F and Manweiler, RW and Marshall, R and Mayes, BW and Mischke, RE and Nefkens, BMK et al.},
Title = {Search for the lepton-family-number nonconserving decay
mu(+)-> e(+)gamma},
Journal = {Physical Review D - Particles, Fields, Gravitation, and
Cosmology},
Volume = {65},
Number = {11},
Pages = {112002},
Year = {2002},
Month = {June},
ISSN = {1550-7998},
url = {http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000176770900005&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=47d3190e77e5a3a53558812f597b0b92},
Doi = {10.1103/PhysRevD.65.112002},
Key = {fds245034}
}
@article{fds245028,
Author = {Ahmed, MW and Blackston, MA and Perdue, BA and Tornow, W and Weller, HR and Norum, B and Sawatzky, B and Prior, RM and Spraker,
M},
Title = {Study of Near-Threshold Deuteron Photodisintegration: An
Indirect Determination of the Gerasimov-Drell-Hearn (GDH)
Sum Rule and Forward Spin Polarizability ($\gamma_0$) for
the Deuteron at Low Energies},
Journal = {Phys. Rev. C77, 044005},
Year = {2008},
Key = {fds245028}
}
@article{fds245030,
Author = {Sabourov, A and Ahmed, MW and Blackston, MA and Crowell, AS and Howell,
CR and Joshi, K and Nelson, SO and Perdue, BA and Sabourov, K and Tonchev,
A and Weller, HR},
Title = {The 7Li(d-vector,n0)8Be and 7Li(d-vector,n1)8Be reactions
below 160 keV},
Journal = {Physical Review},
Volume = {C74},
Pages = {064611},
Year = {2006},
Key = {fds245030}
}
@article{fds245020,
Author = {Spraker, MC and Ahmed, MW and Blackston, MA and Brown, N and III, FRH and Henshaw, SS and Perdue, BA and Prior, RM and Seo, P-N and Stave, S and Weller, HR},
Title = {The B-11(p,alpha)Be-8 -> alpha plus alpha and the
B-11(alpha,alpha)B-11 Reactions at Energies Below 5.4
MeV},
Journal = {Journal of Fusion Energy},
Volume = {31},
Number = {4},
Pages = {357-367},
Year = {2012},
Month = {August},
ISSN = {0164-0313},
url = {http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000305524000007&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=47d3190e77e5a3a53558812f597b0b92},
Doi = {10.1007/s10894-011-9473-5},
Key = {fds245020}
}
@article{fds245017,
Author = {Stave, S and Ahmed, MW and III, FRH and Henshaw, SS and Muellner, B and Perdue, BA and Prior, RM and Spraker, MC and Weller,
HR},
Title = {Understanding the B-11(p, alpha)alpha alpha reaction at the
0.675 MeV resonance},
Journal = {Physics Letters B},
Volume = {696},
Number = {1-2},
Pages = {26-29},
Year = {2011},
Month = {January},
ISSN = {0370-2693},
url = {http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000286708900006&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=47d3190e77e5a3a53558812f597b0b92},
Doi = {10.1016/j.physletb.2010.12.015},
Key = {fds245017}
}