Structure of the low lying levels of the 33S nucleus investigated by the 32S(d,p) 33S reaction

An investigation of the 32S(d, p)33S reaction was made at a deuteron bombarding energy of 12.3 MeV. The energy spectra were measured by magnetic analysis and the obtained angulardistributions were compared with the predictions of DWBA, using the deuteron optical model parameters obtained from an analysis of the elastic scattering of deuterons on 32S nuclei. The absolute values of spectroscopic factors, extracted on this basis, indicate a significant contribution of higher configurations in the ground state wave function of the 32S nucleus. There are no arguments which permit the identification of the observed states of the 33S nucleus as rotational states[...

Parametrization of cross sections for neutron interaction with 1^{1}H, 2^{2}H and 12^{12}C nuclei at energies between 20 and 90 MeV

The experimental data for neutron interaction with $^{1}$H, $^{2}$H and $^{12}$C nuclei are parametrized in energy range 20 to 90 MeV. The energy dependence of the total and reaction cross section is represented in the form of a series of orthogonal polynomials. The logarithm of differential cross section for the angular distribution is expressed as a linear combination of Legendre polynomials with the energy dependence of their coefficients described by a series of orthogonal polynomials

On the distribution of the fluctuating reaction cross section

Exact formula for the statistical distribution function of the fluctuating cross section is presented. Comparison with the results obtained from the approximate formula shows that such a formula can be used for calculation of the cumulative distribution function in the range of its values from 0.01 to 0.99

Elastic scattering of 27.5 MeV alpha particles on 27^{27}Al, 28^{28}Si, 32^{32}S, Ti and 59^{59}Co nuclei and the r0r_{0} discrete ambiguity of the optical potential

Angular distributions for elastic scattering of alpha particles on $^{27}$Al, $^{28}$Si, $^{32}$S, Ti and $^{59}$Co nuclei have been measured in the angular range from about 20$^{\circ}$ to 179$^{\circ}$ (LAB). The experimental data were fitted with the optical model in full angular range. Many sets of four-parameter potentials, describing the elastic scattering, were found with the depths of the real part ranging from 40 to 450 MeV. A new discrete ambiguity in the optical model namely in $r_{0}$ was observed

Statistical analysis of excitation functions for elastic and inelastic scattering of α\alpha-particles on Mg and Si nuclei

The excitation functions for inelastic $\alpha$-scattering leading to the low lying excited states in $^{24}$Mg and $^{28}$Si were measured at $\Theta_{LAB}$ = 170°, 175° and 179° in the LAB energy range 22.75–28.40 MeV. Statistical analysis of these excitation functions and those previously measured for elastic scattering was performed. The direct interaction contribution $\mathit{y}_{D}$ to the reaction studied was obtained from probability distributions of cross sections and from correlation coefficients. Cross correlation coefficients between different reaction channels were calculated

Thermal diffusivity, effusivity and conductivity of CdMnTe mixed crystals

Cd1-xMnxTe mixed crystals belong to a class of materials called ‘‘semimagnetic semiconductor’’ or diluted magnetic semiconductor (DMS) with addition of magnetic ions like Mn2+ implemented into crystal structure. The crystals under investigation were grown from the melt by the high pressure high temperature modified Bridgman method in the range of composition 0 < x < 0.7. Thermal properties of these compounds have been investigated by means of photopyroelectric (PPE) calorimetry in both, back and front detection configuration. The values of the thermal diffusivity and effusivity were derived from experimental data. Thermal conductivity of the specimens was calculated from the simple theoretical dependencies between thermal parameters. The influence of Mn concentration on thermal properties of Cd1-xMnxTe crystals have been presented and discussed

Low-Energy \Lambda-\p Scattering Parameters from the pp→pK+Λpp \to pK^+\Lambda Reaction

Constraints on the spin-averaged $\Lambda p$ scattering length and effective range have been obtained from measurements of the $pp\to pK^+\Lambda$ reaction close to the production threshold by comparing model phase-space Dalitz plot occupations with experimental ones. The data fix well the position of the virtual bound state in the $\Lambda p$ system. Combining this with information from elastic $\Lambda p$ scattering measurements at slightly higher energies, together with the fact that the hyperdeuteron is not bound, leads to a new determination of the low energy $\Lambda p$ scattering parameters.Comment: 18 pages, 7 figure

Study of the mechanism of the five-nucleon transfer reaction 12^{12}C(13^{13}C, 8^{8}Be)17^{17}O

Excitation functions (E$_{cm}$ = 13.4 - 16.8 MeV) and angular distributions (E$_{cm}$ = 13.8 and 16.38 MeV) of $^{12}$C($^{13}$C, $^{8}$Be)$^{17}$O reaction have been measured and analysed by means of statistical and direct reaction mechanism models. The direct reaction analysis includes one and two step processes. For this purpose measurements and analyses were also performed for the reactions $^{12}$C($^{13}$C, $^{9}$Be)$^{16}$O (at E$_{cm}$ = 13.8 MeV) and $^{16}$O($^{9}$Be, $^{8}$Be)$^{17}$O (at E$_{cm}$ = 10.3 and 12.8 MeV). The results were used to estimate the magnitude of the direct two-step (n-$^{4}$He) and ($^{4}$He-n) transfers in the $^{12}$C($^{13}$C, $^{8}$Be)$^{17}$O reaction. These two-step transfers as well as the compound nucleus mechanism, account only for approximately 10% of the experimental cross sections. Thus a dominance of the one-step five-nucleon transfer is concluded. Estimates of the direct $^{5}$He-cluster transfer describe the data qualitatively

Monitoring of the accelerator beam distributions for internal target facilities

We describe a direct method for monitoring the geometrical dimensions of a synchrotron beam at the target position for internal target installations. The method allows for the observation of the proton beam size as well as the position of the beam relative to the target. As a first demonstration of the technique, we present results obtained by means of the COSY-11 detection system installed at the cooler synchrotron COSY. The influence of the stochastic cooling on the COSY proton beam dimensions is also investigated.Comment: 7 pages, 8 figures, Submitted to Nucl. Inst. & Meth.