8,804 research outputs found
Coupled-channel calculation of bound and resonant spectra of Lambda-9Be and Lambda-13C hypernuclei
A Multi-Channel Algebraic Scattering (MCAS) approach has been used to analyze
the spectra of two hyper-nuclear systems, Lambda-9Be and Lambda-13C. The
splitting of the two odd-parity excited levels (1/2^- and 3/2^-) at 11 MeV
excitation in Lambda-13C is driven mainly by the weak Lambda-nucleus spin-orbit
force, but the splittings of the 3/2^+ and 5/2^+ levels in both Lambda-9Be and
Lambda-13C have a different origin. These cases appear to be dominated by
coupling to the collective 2+ states of the core nuclei. Using simple
phenomenological potentials as input to the MCAS method, the observed splitting
and level ordering in Lambda-9Be is reproduced with the addition of a weak
spin-spin interaction acting between the hyperon and the spin of the excited
target. With no such spin-spin interaction, the level ordering in Lambda-9Be is
inverted with respect to that currently observed. In both hyper-nuclei, our
calculations suggest that there are additional low-lying resonant states in the
Lambda-nucleus continua.Comment: 15 pages, 3 figures, 6 tables. To be published in International
Journal of Modern Physics
Exploring abstinence, recovery, identity and personhood in individuals engaging with addiction services
Section A: This review aimed to understand how abstinence is understood in recovery by those who access substance misuse services. A systematic literature review was undertaken
and fourteen studies were identified. These were quality assessed using the CASP quality analysis tool. Limitations of CASP as a tool were discussed. The fourteen studies were
analysed using thematic synthesis and seven themes with ten sub-themes were identified. Themes were organised along a temporal path. Future clinical and research directions were
discussed, as were strengths and limitations of the paper.
Section A: This review aimed to understand how abstinence is understood in recovery by those who access substance misuse services. A systematic literature review was undertaken
and fourteen studies were identified. These were quality assessed using the CASP quality analysis tool. Limitations of CASP as a tool were discussed. The fourteen studies were
analysed using thematic synthesis and seven themes with ten sub-themes were identified. Themes were organised along a temporal path. Future clinical and research directions were
discussed, as were strengths and limitations of the paper
Collective-coupling analysis of spectra of mass-7 isobars: ^7He, ^7Li, ^7Be, ^7B
A nucleon-nucleus interaction model has been applied to ascertain the
underlying character of the negative-parity spectra of four isobars of mass
seven, from neutron-- to proton--emitter driplines. With one single nuclear
potential defined by a simple coupled-channel model, a multichannel algebraic
scattering approach (MCAS) has been used to determine the bound and resonant
spectra of the four nuclides, of which ^7He and ^7B are particle unstable.
Incorporation of Pauli blocking in the model enables a description of all known
spin-parity states of the mass-7 isobars. We have also obtained spectra of
similar quality by using a large space no-core shell model. Additionally, we
have studied ^7Li and ^7Be using a dicluster model. We have found a
dicluster-model potential that can reproduce the lowest four states of the two
nuclei, as well as the relevant low-energy elastic scattering cross sections.
But, with this model, the rest of the energy spectra cannot be obtained.Comment: Extended version published in Phys. Rev. C, 16 pages and 5 figure
Non-localities in nucleon-nucleus potentials
Two causes of non-locality inherent in nucleon-nucleus scattering are
considered. They are the results of two-nucleon antisymmetry of the projectile
with each nucleon in the nucleus and the dynamic polarization potential
representation of channel coupling. For energies MeV, a
g-folding model of the optical potential is used to show the influence of the
knock-out process that is a result of the two-nucleon antisymmetry. To explore
the dynamic polarization potential caused by channel coupling, a multichannel
algebraic scattering model has been used for low-energy scattering.Comment: 12 pages, 11 figures, submitted to EPJ
America Arts for All: Promoting Musical Opportunity and Equity for Socioeconomically Challenged Students
America Arts for All examines the student benefits of being involved in the Central Music Academy, a program that provides free music lessons to students on free or reduced lunch. Some of the benefits their program specifically realizes are higher graduation and college entry rates as well as higher interest in and knowledge of music in comparison to their general public school peers. Low-income students are significantly under-represented in music programs across the nation because they cannot afford instruments or program fees or because they feel that they cannot compete with their more socioeconomically privileged peers. Examination of the student benefits of Central Music Academy provides ample evidence in favor of involving students in music who might otherwise be unable to participate
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