118 research outputs found
Muonium Lamb shift: theory update and experimental prospects
We review the theory of the Lamb shift for muonium, provide an updated
numerical value and present the prospects of the Mu-MASS collaboration at PSI
to improve upon their recent measurement. Due to its smaller nuclear mass, the
contributions of the higher-order recoil corrections (160kHz level) and nucleus
self-energy 40kHz level) are enhanced for muonium compared to hydrogen where
those are below the level of the latest measurement performed by Hessels et al.
and thus could not be tested yet. The ongoing upgrades to the Mu-MASS setup
will open up the possibility to probe these contributions and improve the
sensitivity of this measurement to searches for new physics in the muonic
sector.Comment: 8 page
Coping with information style and family burden:Possible roles of self-stigma and hope among parents of children in a psychiatric inpatient unit
Objective: Parents of children who are hospitalized in inpatient psychiatric units must cope with significant challenges. One of these challenges relates to the way in which they cope with illness-related information. The current study examined the relationship between two such coping styles - monitoring and blunting - and family burden among parents of children in a psychiatric inpatient unit. Moreover, the possible moderating roles.played by hope and self-stigma in these associations were also examined. Methods: Questionnaires regarding coping with information style, self-stigma, hope and family burden were administered to 70 parents. Results: A main positive effect of hope and a main negative effect of self-stigma were uncovered. An interaction between self-stigma and monitoring was also revealed, suggesting that for parents with high self-stigma, compared to those with low self-stigma, more monitoring was related to more burden. Conclusions: Tailoring family interventions according to coping style and self-stigma is highly recommended as a mean to reduce the family burden of parents whose child is hospitalized in a psychiatric inpatient unit. (C) 2016 Elsevier Masson SAS. All rights reserved
Pulsed CW laser for long-term spectroscopic measurements at high power in deep-UV
We present a novel technique for in-vacuum cavity-enhanced UV spectroscopy
that allows nearly continuous measurements over several days, minimizing mirror
degradation caused by high-power UV radiation. Our method relies on pulsing of
the cavity's internal power, which increases the UV intensity to maximum only
for short periods when the studied atom is within the cavity mode volume while
keeping the average power low to prevent mirror degradation. Additionally, this
method significantly decreases laser-induced background on charged particle
detectors. The described 244 nm laser system is designed for 1S-2S two-photon
CW spectroscopy of muonium in the Mu-MASS project. It was tested to provide
intracavity powers above 20 W, requiring maintenance only a few times a day.
The pulsing technique demonstrates minimal impact on the radiation frequency,
with no observed shifts exceeding 15 kHz. Our approach represents a promising
new technique for high-precision spectroscopy of atoms in harsh UV environments
and demonstrates the feasibility of CW spectroscopy of muonium.Comment: 10 pages, 5 figure
Parental Efficacy Moderates the Association Between Empathy and Burden Among Parents of Children Admitted to a Psychiatric Ward
Empathy is considered a positive aspect of caregiving, although in certain circumstances, being empathic might increase the burden of caregivers. The current study assessed the associations between empathy, parental efficacy, and family burden among parents of children who were hospitalized in a psychiatric unit. Specifically, we examined whether the association between empathy and family burden was moderated by the parents' sense of self-efficacy. Seventy parents of children with psychiatric disorders, hospitalized in an inpatient psychiatric unit, filled out questionnaires of empathy, parental efficacy, and family burden. Results supported a moderating role of parental efficacy between empathy and family burden (interaction effect: beta = -1.72, p = .0406). Specifically, empathy was positively related to family burden among parents with low self-efficacy (conditional effect = 0.70, p = .032) and negatively related to family burden among parents with high self-efficacy (conditional effect = -0.39, p = N.S). Implications for practice include the importance of self-efficacy and address the possible negative implications of empathy among parents of children treated in a psychiatric hospital
Towards Precision Muonic X-Ray Measurements of Charge Radii of Light Nuclei
Precision studies of the properties of nuclei are essential both for
understanding nuclear physics at low energy, and for confronting experiment and
theory in simple atomic systems. Such comparisons advance our understanding of
bound-state quantum electrodynamics and are useful for searching for new
physics beyond the Standard Model. The energy levels of muonic atoms are highly
susceptible to nuclear structure, especially to the RMS charge radius. The
radii of the lightest nuclei () have been determined with high accuracy
via laser spectroscopy in muonic atoms, while those of medium mass and above,
from X-ray spectroscopy with semiconductor detectors. In this communication we
present a new experiment aiming at precision measurements of the radii of light
nuclei via single-photon energy measurements with cryogenic
microcalorimeters; a quantum sensing technology capable of high efficiency and
outstanding resolution for low-energy X-rays
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