4,743 research outputs found
Isospin breaking in pion-nucleon scattering at threshold by radiative processes
We investigate the dispersive contribution by radiative processes such as
(pi- proton to neutron gamma) and (pi- proton to Delta gamma) to the
pion-nucleon scattering lengths of charged pions in the heavy baryon limit.
They give a large isospin violating contribution in the corresponding isoscalar
scattering length, but only a small violation in the isovector one. These terms
contribute 6.3(3)% to the 1s level shift of pionic hydrogen and give a chiral
constant F_pi^2f_1=-25.8(8) MeV.Comment: 9 pages with 1 figur
Precision determination of the pi-N scattering lengths and the charged pi-NN coupling constant
We critically evaluate the isovector GMO sumrule for the charged
coupling constant using recent precision data from p and d atoms
and with careful attention to systematic errors. From the d scattering
length we deduce the pion-proton scattering lengths (statistic) (systematic))~ and . From this a direct evaluation gives (statistic)(systematic) or .Comment: 4 pages, 1 figure, latex and postscript; invited talk at PANIC99; to
appear in Nucl. Phys. A; changed notation: g^2 and f^2 replaced by
conventional g^2/4\pi and f^2/4\p
Chiral Dynamics of Deeply Bound Pionic Atoms
We present and discuss a systematic calculation, based on two-loop chiral
perturbation theory, of the pion-nuclear s-wave optical potential. A proper
treatment of the explicit energy dependence of the off-shell pion self-energy
together with (electromagnetic) gauge invariance of the Klein-Gordon equation
turns out to be crucial. Accurate data for the binding energies and widths of
the 1s and 2p levels in pionic ^{205}Pb and ^{207}Pb are well reproduced, and
the notorious "missing repulsion" in the pion-nuclear s-wave optical potential
is accounted for. The connection with the in-medium change of the pion decay
constant is clarified.Comment: preprint ECT*-02-16, 4 pages, 3 figure
Impulse approximation in the n p --> d pi^0 reaction reexamined
The impulse approximation (one-body operator) in the n p --> d pi^0 reaction
is reexamined with emphasis on the issues of reducibility and recoil
corrections. An inconsistency when one pion exchange is included in the
production operator is demonstrated and then resolved via the introduction of
"wave function corrections" which nearly vanish for static nucleon propagators.
Inclusion of the recoil corrections to the nucleon propagators is found to
change the magnitude and sign of the impulse production amplitude, worsening
agreement with the experimental cross section by approximately 30%. A cutoff is
used to account for the phenomenological nature of the external wave functions,
and is found to have a significant impact up to approximately 2.5 GeV.Comment: Published versio
Isospin breaking of the narrow charmonium state of Belle at 3872 MeV as a deuson
The narrow charmonium state near 3872 MeV reported by the Belle collaboration
and confirmedby CDF lies almost exactly at the neutral D anti-D* threshold. As
was predicted many years ago it can be a deuteronlike meson-meson state called
a deuson. If so, it should be an axial, or possibily a pseudoscalar state with
C=0, and isospin predominantly 0. Large isospin breaking is expected because of
the isospin mass splitting between the neutral and charged D (D*) mesons.
Because of this large isospin breaking the decay X(3872) to J/psi rho would be
allowed, while J/psi sigma would be forbidden by C-parity, as indicated by the
present data.Comment: 7 latex pages 5 figures. This report supercedes the unpublished
reminder hep-ph/0308277. Version 2 to appear in Physics Letters B, one
reference added and minor improvement
Some Preliminary Observations On The Acoustic Behavior Of Semi-Domestic Reindeer (Rangifer Tarandus Tarandus) With Emphasis On Intraspecific Communication And The Mother-Calf Relationship
Thesis (M.S.) University of Alaska Fairbanks, 197
Ground state energy fluctuations in nuclear matter II
Improvements are performed on a recently proposed statistical theory of the
mean field of a many-fermion system. The dependence of the predictions of the
theory upon its two basic ingredients, namely the Hartree-Fock energy and the
average energy of the two particle-two hole excitations, is explored.Comment: 16 pages, 1 figure, revte
Subjective Bayesian Models in Sampling Finite Populations
Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/146905/1/rssb00782.pd
Implementation of a Wellness Program for Nurse Leaders
Background: The setting for this study is the implementation of a wellness program for nurse leaders at Hospital A, a healthcare organization servicing the South Sacramento area in California. Healthcare is a challenging and high-demand profession, and the COVID-19 pandemic has exacerbated an issue of burnout and unwavering job-related stress for physicians and employees. This remains true for nurse leader professionals who take on the responsibility to ensure safety and quality always remains at ideal measures for any facility.
Problem: During the past several years of the pandemic, the nurse leader role has had to endure several unknowns, placing significant stress on many, causing some to exit their role. In Hospital A, the facility has lost an average of three nurse leaders each year during the pandemic. Aside from having to deal with a once in a lifetime public health emergency, another contributing factor could well be the lack of a wellness program to aide in dealing with the strenuous work associated with being a nurse leader.
Intervention: The goal of implementing a wellness program for nurse leaders is to improve their overall wellness as measured by a survey pre and post implementation. The survey consists of questions pertaining to five elements of employee health and wellness: emotional, environmental, occupational, physical health, and social well-being. Specific Plan-Do-Study-Act (PDSA) cycles will be created based on the measures of the survey.
Outcome Measure: The outcome measure for this quality improvement project was an improvement in wellness scores by 20% from pre and post implementation surveys. The process measure for this project was a 5% increase from baseline for the specific elements of wellness addressed by the PDSA cycles: occupational well-being and physical health.
Results: A total of 40 nurse leaders took the wellness survey pre-implementation on May 1, 2023. After two and a half months of the wellness program, which included several PDSA cycles, the wellness scores remained unchanged from a baseline score of 3.83/5.00 rating to a 3.80/5.00. The process measures around occupational well-being and physical health had a 7.9% and 5.5% increase, respectively, within the project time period.
Conclusion: The implementation of a wellness program shows benefits to nurse leaders in certain aspects of their workplace wellness. As Hospital A continues to transition out of the pandemic back into normal operations, sustainability of the program must remain a focus to ensure nurse leader wellness remains a top priority for organizational goals
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