281 research outputs found
Isotopic Production Cross Sections in Proton-Nucleus Collisions at 200 MeV
Intermediate mass fragments (IMF) from the interaction of Al,
Co and Au with 200 MeV protons were measured in an angular range
from 20 degree to 120 degree in the laboratory system. The fragments, ranging
from isotopes of helium up to isotopes of carbon, were isotopically resolved.
Double differential cross sections, energy differential cross sections and
total cross sections were extracted.Comment: accepted by Phys. Rev.
Fission studies with 140 MeV -Particles
Binary fission induced by 140 MeV -particles has been measured for
Ag, La, Ho and Au targets. The measured
quantities are the total kinetic energies, fragment masses, and fission cross
sections. The results are compared with other data and systematics. A minimum
of the fission probability in the vicinity is observed.Comment: 4 figures, 2 table
Non-equilibrium emission of complex fragments from p+Au collisions at 2.5 GeV proton beam energy
Energy and angular dependence of double differential cross sections
d/ddE was measured for reactions induced by 2.5 GeV protons
on Au target with isotopic identification of light products (H, He, Li, Be, and
B) and with elemental identification of heavier intermediate mass fragments (C,
N, O, F, Ne, Na, Mg, and Al). It was found that two different reaction
mechanisms give comparable contributions to the cross sections. The
intranuclear cascade of nucleon-nucleon collisions followed by evaporation from
an equilibrated residuum describes low energy part of the energy distributions
whereas another reaction mechanism is responsible for high energy part of the
spectra of composite particles. Phenomenological model description of the
differential cross sections by isotropic emission from two moving sources led
to a very good description of all measured data. Values of the extracted
parameters of the emitting sources are compatible with the hypothesis claiming
that the high energy particles emerge from pre-equilibrium processes consisting
in a breakup of the target into three groups of nucleons; small, fast and hot
fireball of 8 nucleons, and two larger, excited prefragments, which
emits the light charged particles and intermediate mass fragments. The smaller
of them contains 20 nucleons and moves with velocity larger than the CM
velocity of the proton projectile and the target. The heavier prefragment
behaves similarly as the heavy residuum of the intranuclear cascade of
nucleon-nucleon collisions. %The mass and charge dependence of the total
production cross %sections was extracted from the above analysis for all
observed %reaction products. This dependence follows the power low behavior
%(A or Z)
Nuclear multifragmentation and fission: similarity and differences
Thermal multifragmentation of hot nuclei is interpreted as the nuclear
liquid--fog phase transition deep inside the spinodal region. The experimental
data for p(8.1GeV) + Au collisions are analyzed. It is concluded that the decay
process of hot nuclei is characterized by two size parameters: transition state
and freeze-out volumes. The similarity between dynamics of fragmentation and
ordinary fission is discussed. The IMF emission time is related to the mean
rupture time at the multi-scission point, which corresponds to the kinetic
freeze-out configuration.Comment: 7 pages, 3 Postscript figures, Proceedings of IWM 2005, Catani
Physicians Charged with Opioid-Analgesic Prescribing Offenses
Word counts: abstract = 249 , text = 4,329 ABSTRACT Objective. To provide a "big-picture" overview of the characteristics and outcomes of recent criminal and administrative cases in which physicians have been criminally prosecuted or charged by medical boards with offenses related to inappropriate prescribing of opioid analgesics. Design: We identified as many criminal and administrative cases of these types as possible that occurred between 1998 and 2006. Cases were identified using a wide variety of sources, including organizational and government-agency databases, published news accounts, and Websites. Factual characteristics of these cases and their outcomes, and of the physicians involved, then were further researched using additional sources and methods. Setting: Study findings are intended to apply to practicing U.S. patient care physicians as a whole. Patients or other participants: There were no patients or participants in this study. Outcome measures: We analyzed the numbers and types of cases and physicians involved, criminal and administrative charges brought, case outcomes and sanctions, specialties and other characteristics of the physicians involved. Results: The study identified 725 doctors, representing an estimated 0.1% of practicing patient care physicians, who were charged between 1998 and 2006 with criminal and/or administrative offenses related to prescribing opioid analgesics. A plurality of these (39.3%) were General Practice/Family Medicine physicians, compared with 3.5% who were self-identified or board-certified pain specialists. Physicians in this sample were more likely to be male, older, and not board certified (P<0.001). DEA criminal and complaint investigations averaged 658 per year (2003)(2004)(2005)(2006) and "for cause" surrenders of DEA registrations averaged 369.7 (2000-2006). Conclusions: Criminal or administrative charges and sanctions for prescribing opioid analgesics are rare. In addition, there appears to be little objective basis for concern that pain specialists have been "singled out" for prosecution or administrative sanctioning for such offenses
Comparison of nonequilibrium processes in p+Ni and p+Au collisions at GeV energies
The energy and angular dependence of double differential cross sections
d2sigma/dOmega dE were measured for p, d, t, 3,4,6He, 6,7,8Li, 7,9,10Be,
10,11B, and C produced in collisions of 1.2, 1.9, and 2.5 GeV protons with a Ni
target. The shape of the spectra and angular distributions does almost not
change whereas the absolute value of the cross sections increases by a factor
about 1.7 for all ejectiles in this beam energy range. It was found that energy
and angular dependencies of the cross sections cannot be reproduced by the
microscopic model of intranuclear cascade with coalescence of nucleons and the
statistical model for evaporation of particles from excited, equilibrated
residual nuclei. The inclusion of nonequilibrium processes, described by a
phenomenological model of the emission from fast and hot moving sources,
resulting from break-up of the target nucleus by impinging proton, leads to
very good reproduction of data. Cross sections of these processes are quite
large, exhausting approximately half of the total production cross sections.
Due to good reproduction of energy and angular dependencies of d2sigma/dOmega
dE by model calculation it was possible to determine total production cross
sections for all studied ejectiles. Results obtained in this work point to the
analogous reaction mechanism for proton induced reactions on Ni target as that
observed previously for Au target in the same beam energy range.Comment: 11 pages, 10 figures
Variation of nonequilibrium processes in p+Ni system with beam energy
The energy and angular dependence of double differential cross sections
dsigma/dOmega dE were measured for p, d, t, 3,4He, 6,7Li, 7,9Be, and 10,11B
produced in collisions of 0.175 GeV protons with Ni target. The analysis of
measured dfferential cross sections allowed to extract total production cross
sections for ejectiles listed above. The shape of the spectra and angular
distributions indicate the presence of other nonequilibrium processes besides
the emission of nucleons from the intranuclear cascade, and besides the
evaporation of various particles from remnants of intranuclear cascade. These
nonequilibrium processes consist of coalescence of nucleons into light charged
particles during the intranuclear cascade, of the fireball emission which
contributes to the cross sections of protons and deuterons, and of the break-up
of the target nucleus which leads to the emission of intermediate mass
fragments. All such processes were found earlier at beam energies 1.2, 1.9, and
2.5 GeV for Ni as well as for Au targets, however, significant differences in
properties of these processes at high and low beam energy are observed in the
present study.Comment: 10 pages, 9 figure
Caloric curves and critical behavior in nuclei
Data from a number of different experimental measurements have been used to
construct caloric curves for five different regions of nuclear mass. These
curves are qualitatively similar and exhibit plateaus at the higher excitation
energies. The limiting temperatures represented by the plateaus decrease with
increasing nuclear mass and are in very good agreement with results of recent
calculations employing either a chiral symmetry model or the Gogny interaction.
This agreement strongly favors a soft equation of state. Evidence is presented
that critical excitation energies and critical temperatures for nuclei can be
determined over a large mass range when the mass variations inherent in many
caloric curve measurements are taken into account.Comment: In response to referees comments we have improved the discussion of
the figures and added a new figure showing the relationship between the
effective level density and the excitation energy. The discussion has been
reordered and comments are made on recent data which support the hypothesis
of a mass dependence of caloric curve
- …