144 research outputs found
Delayed clusters accompanying nonmesonic weak decay of the -hypernuclei: a clue to nonleptonic processes
The nonmesonic decay of -hypernuclei provides access to the
nonleptonic weak decay process , which is achievable only
through the observation of hypernuclear ground-state decays. We continue the
discussion of some specific cases which make it possible to detect a few
exclusive transitions, namely, the stripping of nucleon from the ground state
results in a resonance state decaying via emission of two clusters. Delayed
clusters accompanying weak decay of light hypernuclei give a unique information
on spin dependence of the weak decay matrix elements.Comment: Presented at International Bogolyubov Conference "Problems of
Theoretical and Mathematical Physics" (dedicated to the 100th anniversary of
the birth of N.N.~Bogolyubov) Dubna, Russia, August 21 - 27, 200
Shell-model calculations for p-shell hypernuclei
The interpretation of hypernuclear gamma-ray data for p-shell hypernuclei in
terms of shell-model calculations that include the coupling of Lambda- and
Sigma-hypernuclear states is briefly reviewed. Next, Lambda 8Li, Lambda 8Be,
and Lambda 9Li are considered, both to exhibit features of Lambda-Sigma
coupling and as possible source of observed, but unassigned, hypernuclear gamma
rays. Then, the feasibility of measuring the ground-state doublet spacing of
Lambda 10Be, which, like Lambda 9Li, could be studied via the (K-,pi0 gamma)
reaction, is investigated. Structural information relevant to the population of
states in these hypernuclei in recent (e,e'K+) studies is also given. Finally,
the extension of the shell-model calculations to sd-shell hypernuclei is
briefly considered.Comment: 17 pages, 3 figures. Contribution to special volume on Strangeness
Nuclear Physic
Performance of HPGe Detectors in High Magnetic Fields
A new generation of high-resolution hypernuclear gamma$-spectroscopy
experiments with high-purity germanium detectors (HPGe) are presently designed
at the FINUDA spectrometer at DAPhiNE, the Frascati phi-factory, and at PANDA,
the antiproton proton hadron spectrometer at the future FAIR facility. Both,
the FINUDA and PANDA spectrometers are built around the target region covering
a large solid angle. To maximise the detection efficiency the HPGe detectors
have to be located near the target, and therefore they have to be operated in
strong magnetic fields B ~ 1 T. The performance of HPGe detectors in such an
environment has not been well investigated so far. In the present work VEGA and
EUROBALL Cluster HPGe detectors were tested in the field provided by the ALADiN
magnet at GSI. No significant degradation of the energy resolution was found,
and a change in the rise time distribution of the pulses from preamplifiers was
observed. A correlation between rise time and pulse height was observed and is
used to correct the measured energy, recovering the energy resolution almost
completely. Moreover, no problems in the electronics due to the magnetic field
were observed.Comment: submitted to Nucl. Instrum. Meth. Phys. Res. A, LaTeX, 19 pages, 9
figure
New detectors for the kaon and hypernuclear experiments with KaoS at MAMI and with PANDA at GSI
The KaoS spectrometer at the Mainz Microtron MAMI, Germany, is perceived as
the ideal candidate for a dedicated spectrometer in kaon and hypernuclei
electroproduction. KaoS will be equipped with new read-out electronics, a
completely new focal plane detector package consisting of scintillating fibres,
and a new trigger system. First prototypes of the fibre detectors and the
associated new front-end electronics are shown in this contribution. The Mainz
hypernuclei research program will complement the hypernuclear experiments at
the planned FAIR facility at GSI, Germany. At the proposed antiproton storage
ring the spectroscopy of double Lambda hypernuclei is one of the four main
topics which will be addressed by the PANDA Collaboration. The experiments
require the operation of high purity germanium (HPGe) detectors in high
magnetic fields (B= 1T) in the presence of a large hadronic background. The
performance of high resolution Ge detectors in such an environment has been
investigated.Comment: Presentation at International Symposium on the Development of
Detectors for Particle, Astroparticle and Synchrotron Radiation Experiments,
Stanford, Ca (SNIC06), 6 pages, LaTeX, 11 eps figure
Delayed Pion Spectroscopy of Hypernuclei
New possibilities of hypernuclear studies at modern electron accelerators based on recently developed radio frequency photomultiplier tubes are discussed
Neutron Rich Hypernuclei in Chiral Soliton Model
The binding energies of neutron rich strangeness hypernuclei are
estimated in the chiral soliton approach using the bound state rigid oscillator
version of the SU(3) quantization model. Additional binding of strange
hypernuclei in comparison with nonstrange neutron rich nuclei takes place at
not large values of atomic (baryon) numbers, . This effect
becomes stronger with increasing isospin of nuclides, and for "nuclear variant"
of the model with rescaled Skyrme constant . Total binding energies of
(Lambda)He-8 and recently discovered (Lambda)H-6 satisfactorily agree with
experimental data. Hypernuclei (Lambda)H-7, (Lambda)He-9 are predicted to be
bound stronger in comparison with their nonstrange analogues H-7, He-9;
hypernuclei (Lambda)Li-10, (Lambda)Li-11, (Lambda)Be-12, (Lambda)Be-13, etc.
are bound stronger in the nuclear variant of the model.Comment: 8 pages, 4 tables; amendments made, data on binding energy of
(Lambda)He-8 and references added; prepared for the conferences Quarks-2012
and HYP201
Few-nucleon systems in translationally invariant harmonic oscillator basis
We present a translationally invariant formulation of the no-core shell model
approach for few-nucleon systems. We discuss a general method of
antisymmetrization of the harmonic-oscillator basis depending on Jacobi
coordinates. The use of a translationally invariant basis allows us to employ
larger model spaces than in traditional shell-model calculations. Moreover, in
addition to two-body effective interactions, three- or higher-body effective
interactions as well as real three-body interactions can be utilized. In the
present study we apply the formalism to solve three and four nucleon systems
interacting by the CD-Bonn nucleon-nucleon potential. Results of ground-state
as well as excited-state energies, rms radii and magnetic moments are
discussed. In addition, we compare charge form factor results obtained using
the CD-Bonn and Argonne V8' NN potentials.Comment: 25 pages. RevTex. 13 Postscript figure
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