3,286 research outputs found
Regularities with random interactions in energy centroids defined by group symmetries
Regular structures generated by random interactions in energy centroids
defined over irreducible representations (irreps) of some of the group
symmetries of the interacting boson models IBM, IBM, IBM- and
IBM- are studied by deriving trace propagations equations for the
centroids. It is found that, with random interactions, the lowest and highest
group irreps in general carry most of the probability for the corresponding
centroids to be lowest in energy. This generalizes the result known earlier,
via numerical diagonalization, for the more complicated fixed spin ()
centroids where simple trace propagation is not possible.Comment: 18 pages, 3 figure
High-j single-particle neutron states outside the N=82 core
The behaviour of the i13/2 and h9/2 single-neutron strength was studied with
the (4He,3He) reaction on 138Ba, 140Ce, 142Nd and 144Sm targets at a beam
energy of 51 MeV. The separation between the single-neutron states i13/2 and
h9/2 was measured in N =83 nuclei with changing proton number. To this end
spectroscopic factors for states populated in high-l transfer were extracted
from the data. Some mixing of l=5 and 6 strength was observed with states that
are formed by coupling the f7/2 state to the 2+ and 3- vibrational states and
the mixing matrix elements were found to be remarkably constant. The centroids
of the strength indicate a systematic change in the energies of the i13/2 and
h9/2 single-neutron states with increasing proton number that is in
quantitative agreement with the effects expected from the tensor interaction.Comment: 12 pages of text, 3 diagram
Frailty, Psychoactive Medications, and Cognitive Dysfunction Are Associated With Poor PatientâReported Outcomes in Cirrhosis
Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/148384/1/hep30336-sup-0001-Supinfo.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/148384/2/hep30336_am.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/148384/3/hep30336.pd
Interval gangrene complicating superficial femoral artery stent placement
Interval gangreneânecrosis of tissue proximal to a successful distal revascularization procedureâis an exceeding rare complication. To date, only nine cases have been reported in the literature, and all were secondary to traditional open bypass procedures. We report the first case, to our knowledge, of interval gangrene after endovascular stent placement in the superficial femoral artery. We believe that with the increasing utilization of endovascular techniques to treat limb ischemia, the serious complication of interval gangrene must be revisited. Assessment of collateral circulation, precise stent placement, and the appropriate choice of stents and stent grafts will become increasing important as more and more of these lesions are treated with endovascular techniques
Thermonuclear Ti-42(p, gamma)V-43 rate in type-I x-ray bursts
The thermonuclear rate of the Ti-42(p, gamma)V-43 reaction has been reevaluated based on a recent precise proton separation energy measurement of S-p(V-43) = 83 +/- 43 keV. The astrophysical impact of our new rates has been investigated through one-zone postprocessing type-I x-ray burst calculations. It shows that the new experimental value of S-p significantly affects the yields of species for A approximate to 40-45. As well, the precision of the recent experimental S-p value constrains these yields to better than a factor of 3.Peer reviewedFinal Accepted Versio
Double Charge Exchange And Configuration Mixing
The energy dependence of forward pion double charge exchange reactions on
light nuclei is studied for both the Ground State transition and the
Double-Isobaric-Analog-State transitions. A common characteristic of these
double reactions is a resonance-like peak around 50 MeV pion lab energy. This
peak arises naturally in a two-step process in the conventional pion-nucleon
system with proper handling of nuclear structure and pion distortion. A
comparison among the results of different nuclear structure models demonstrates
the effects of configuration mixing. The angular distribution is used to fix
the single particle wave function.Comment: Added 1 figure (now 8) corrected references and various other change
The Equivalence Problem for Deterministic MSO Tree Transducers is Decidable
It is decidable for deterministic MSO definable graph-to-string or
graph-to-tree transducers whether they are equivalent on a context-free set of
graphs
Unexpected late-time temperature increase observed in two neutron star crust cooling sources -- XTE~J1701-462 and EXO~0748-676
Transient LMXBs that host neutron stars (NSs) provide excellent laboratories
for probing the dense matter physics present in NS crusts. During accretion
outbursts in LMXBs, exothermic reactions may heat the NS crust, disrupting the
crust-core equilibrium. When the outburst ceases, the crust cools to restore
thermal equilibrium with the core. Monitoring this evolution allows us to probe
the dense matter physics in the crust. Properties of the deeper crustal layers
can be probed at later times after the end of the outburst. We report on the
unexpected late-time temperature evolution (>2000 days after the end of their
outbursts) of two NSs in LMXBs, XTE J1701-462 and EXO 0748-676. Although both
these sources exhibited very different outbursts (in terms of duration and the
average accretion rate), they exhibit an unusually steep decay of ~7 eV in the
observed effective temperature (occurring in a time span of ~700 days) around
~2000 days after the end of their outbursts. Furthermore, they both showed an
even more unexpected rise of ~3 eV in temperature (over a time period of
~500-2000 days) after this steep decay. This rise was significant at the
2.4{\sigma} and 8.5{\sigma} level for XTE J1701-462 and EXO 0748-676,
respectively. The physical explanation for such behaviour is unknown and cannot
be straightforwardly be explained within the cooling hypothesis. In addition,
this observed evolution cannot be well explained by low-level accretion either
without invoking many assumptions. We investigate the potential pathways in the
theoretical heating and cooling models that could reproduce this unusual
behaviour, which so far has been observed in two crust-cooling sources. Such a
temperature increase has not been observed in the other NS crust-cooling
sources at similarly late times, although it cannot be excluded that this might
be a result of the inadequate sampling obtained at such late times.Comment: accepted for publication by A&A letter
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Association of urinary uromodulin with kidney function decline and mortality: the health ABC studyâ©.
BackgroundUrine uromodulin (uUMOD) is a protein secreted by the kidney tubule. Recent studies have suggested that higher uUMOD may be associated with improved kidney and mortality outcomes.MethodsUsing a case-cohort design, we evaluated the association between baseline uUMOD levels and â„ 30% estimated glomerular filtration rate (eGFR) decline, incident chronic kidney disease (CKD), rapid kidney function decline, and mortality using standard and modified Cox proportional hazards regression.ResultsThe median value of uUMOD was 25.8 ”g/mL, mean age of participants was 74 years, 48% were women, and 39% were black. Persons with higher uUMOD had lower prevalence of diabetes and coronary artery disease (CAD), and had lower systolic blood pressure. Persons with higher uUMOD also had higher eGFR, lower urinary albumin to creatinine ratio (ACR), and lower C-reactive protein (CRP). There was no association of uUMOD with > 30% eGFR decline. In comparison to those in the lowest quartile of uUMOD, those in the highest quartile had a significantly (53%) lower risk of incident CKD (CI 73%, 18%) and a 51% lower risk of rapid kidney function decline (CI 76%, 1%) after multivariable adjustment. Higher uUMOD was associated with lower risk of mortality in demographic adjusted models, but not after multivariable adjustment.ConclusionHigher levels of uUMOD are associated with lower risk of incident CKD and rapid kidney function decline. Additional studies are needed in the general population and in persons with advanced CKD to confirm these findings.â©
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