153 research outputs found
USE OF REPEREN POLYMER MESHES IN SURGICAL TREATMENT OF PECTUS EXCAVATUM
In patients with the I degree of pectus excavatum a retraction of the sternocostal complex is insignificant and does not influence the functional state of visceral organs. It is the elimination of a cosmetic defect that matters for such patients above all. There are various methods of aesthetic correction, still there is no consensus on how to perform an aesthetic thoracoplasty in patients with pectus excavatum. The purpose of this study was to develop a technique of aesthetic thoracoplasty with the use of Reperen polymer and to evaluate short-term results. Material and methods. From 2011 till 2013, 10 patients underwent thoracoplasty with the use of Reperen polymer meshes. All patients were male. At the time of the surgery their average age was 18.7 years (from 15 to 26 years old). The technique consists in laying molded Reperen mesh plates on the front surface of the sternocostal complex layer by layer. From 3 to 7 layers are formed. Results. The surgeries performed were successful. In all cases the postoperative period was smooth, with no complications observed. A good result accounted for 80% of the cases, a satisfactory result was observed in 20%. We did not observe any negative results. The implants installed were not removed, no excessive contouring was observed. Conclusion. A new technique of aesthetic thoracoplasty with the use of Reperen polymer plates was developed and implemented. It was found that this type of surgery is easily tolerable by patients, gives a good aesthetic result with a low risk of complications, and is characterized by a short hospital and rehabilitation period
Three-body correlations in direct reactions: Example of Be populated in reaction
The Be continuum states were populated in the charge-exchange reaction
H(Li,Be) collecting very high statistics data ( events) on the three-body ++ correlations. The
Be excitation energy region below MeV is considered, where the
data are dominated by contributions from the and states. It is
demonstrated how the high-statistics few-body correlation data can be used to
extract detailed information on the reaction mechanism. Such a derivation is
based on the fact that highly spin-aligned states are typically populated in
the direct reactions.Comment: submitted to Physical Review
New insight into the low-energy He spectrum
The spectrum of He was studied by means of the He(,)He
reaction at a lab energy of 25 MeV/n and small center of mass (c.m.) angles.
Energy and angular correlations were obtained for the He decay products by
complete kinematical reconstruction. The data do not show narrow states at
1.3 and 2.4 MeV reported before for He. The lowest resonant
state of He is found at about 2 MeV with a width of 2 MeV and is
identified as . The observed angular correlation pattern is uniquely
explained by the interference of the resonance with a virtual state
(limit on the scattering length is obtained as fm), and with
the resonance at energy MeV.Comment: 5 pages, 4 figures, 2 table
10He low-lying states structure uncovered by correlations
The 0+ ground state of the 10He nucleus produced in the 3H(8He,p)10He
reaction was found at about MeV (\Gamma ~ 2 MeV) above the
three-body 8He+n+n breakup threshold. Angular correlations observed for 10He
decay products show prominent interference patterns allowing to draw
conclusions about the structure of low-energy excited states. We interpret the
observed correlations as a coherent superposition of the broad 1- state having
a maximum at energy 4-6 MeV and the 2+ state above 6 MeV, setting both on top
of the 0+ state "tail". This anomalous level ordering indicates that the
breakdown of the N=8 shell known in 12Be thus extends also to the 10He system.Comment: 5 pages, 5 figure
Structure of unbound neutron-rich He studied using single-neutron transfer
The 8He(d,p) reaction was studied in inverse kinematics at 15.4A MeV using
the MUST2 Si-CsI array in order to shed light on the level structure of 9He.
The well known 16O(d,p)17O reaction, performed here in reverse kinematics, was
used as a test to validate the experimental methods. The 9He missing mass
spectrum was deduced from the kinetic energies and emission angles of the
recoiling protons. Several structures were observed above the neutron-emission
threshold and the angular distributions were used to deduce the multipolarity
of the transitions. This work confirms that the ground state of 9He is located
very close to the neutron threshold of 8He and supports the occurrence of
parity inversion in 9He.Comment: Exp\'erience GANIL/SPIRAL1/MUST
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