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709 results on '"Bailey, GW"'

1. Nonlocal nucleon-nucleus interactions in (d,p) reactions: Role of the deuteron D state

Author

Bailey, GW, Timofeyuk, Natalia, and Tostevin, Jeffrey

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

Theoretical models of the (d, p) reaction are exploited for both nuclear astrophysics and spectroscopic studies in nuclear physics. Usually, these reaction models use local optical model potentials to describe the nucleon- and deuteron-target interactions. Within such a framework the importance of the deuteron D-state in low-energy reactions is normally associated with spin observables and tensor polarization effects - with very minimal influence on differential cross sections. In contrast, recent work that includes the inherent nonlocality of the nucleon optical model potentials in the Johnson-Tandy adiabatic-model description of the (d, p) transition amplitude, which accounts for deuteron break-up effects, shows sensitivity of the reaction to the large n-p relative momentum content of the deuteron wave function. The dominance of the deuteron D-state component at such high momenta leads to significant sensitivity of calculated (d, p) cross sections and deduced spectroscopic factors to the choice of deuteron wave function [Phys. Rev. Lett. 117, 162502 (2016)]. We present details of the Johnson-Tandy adiabatic model of the (d, p) transfer reaction generalized to include the deuteron D-state in the presence of nonlocal nucleon-target interactions. We present exact calculations in this model and compare these to approximate (leading-order) solutions. The latter, approximate solutions can be interpreted in terms of local optical potentials, but evaluated at a shifted value of the energy in the nucleon-target system. This energy shift is increased when including the D-state contribution. We also study the expected dependence of the D-state effects on the separation energy and orbital angular momentum of the transferred nucleon. Their influence on the spectroscopic information extracted from (d, p) reactions is quantified for a particular case of astrophysical significance.

Published
2017

2. Absorption correction of Fe Lab emission from iron oxides

Author

Voelkl E; Piston D; Gauvin R; Lockley AJ; Bailey GW; Mickernan S, Remond, L, Fialin, M, Nockolds, C, Roques-Carmes, C, Phillips, M, Voelkl E; Piston D; Gauvin R; Lockley AJ; Bailey GW; Mickernan S, Remond, L, Fialin, M, Nockolds, C, Roques-Carmes, C, and Phillips, M

Published
2002

4. The 4P's Plus screen for substance use in pregnancy: clinical application and outcomes.

Author

Chasnoff IJ, McGourty RF, Bailey GW, Hutchins E, Lightfoot SO, Pawson LL, Fahey C, May B, Brodie P, McCulley L, and Campbell J

Abstract

OBJECTIVE: Determine the prevalence of substance use among pregnant women in five diverse communities utilizing the 4P's Plus screen for alcohol, tobacco, and other drug use. STUDY DESIGN: Pregnant women enrolled in prenatal care clinics in five communities were screened for substance use with the 4P's Plus. Those women with a positive screen underwent an assessment for substance use through a follow-up structured clinical interview conducted at the same prenatal visit. RESULTS: Among 7818 women in five communities, 2555 (32.7%) had a positive screen for substance use in pregnancy. Four of the communities conducted a follow-up assessment on all women with a positive screen (n = 1548). Among these women, 717 (15% of the total population) had continued use after learning of the pregnancy. Overall, 21% of the pregnant women used alcohol prior to recognition of the pregnancy, and 11% continued use after knowledge of the pregnancy. Among the 512 women who continued to use alcohol, 2% were drinking daily, 7% were drinking 3 to 6 days per week, 27% were drinking 1 to 2 days per week, and 63% were drinking less than 1 day per week. The rates of marijuana use and other illicit drug use among the women were 7 and 2%, respectively, prior to knowledge of pregnancy and dropped to 3 and 1% after learning of the pregnancy. CONCLUSION: The 4P's Plus identifies not only those pregnant women whose drinking or drug use is at a high enough level to impair daily functioning, but provides an opportunity for early intervention for the much larger group of women whose pregnancies are at risk from relatively small amounts of substance use. [ABSTRACT FROM AUTHOR]

Published
2005
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