Theoretical prediction of probable isotopes of superheavy nuclei of Z = 122

We have studied the [Formula: see text]-decay half-life and spontaneous fission half-lives of isotopes of superheavy element [Formula: see text] in the range [Formula: see text]. A comparison of calculated alpha half-lives with the literature [D. N. Poenaru, R. A. Gherghescu and W. Greiner, Phys. Rev. C 83 (2011) 014601, D. N. Poenaru, R. A. Gherghescu and W. Greiner, Phys. Rev. C 85 (2012) 034615] and the analytical formulas of Royer [G. Royer, J. Phys. G; Nucl. Part. Phys. 26 (2000) 1149] shows good agreement with each other. To identify the mode of decay of these isotopes, the spontaneous-fission half-lives were also evaluated using the semiempirical relation given by [C. Xu, Z. Ren and Y. Guo, Phys. Rev. C 78 (2008) 044329]. A comparative study on the competition of alpha decay versus spontaneous fission of superheavy nuclei (SHN) reveals that around eight isotopes ([Formula: see text]122) survive fission and have alpha decay channel as the prominent mode of decay and hold the possibility to be synthesized in the laboratory. The alpha decay half-lives and spontaneous fission half-lives of SHN with [Formula: see text], [Formula: see text]–306, with [Formula: see text], [Formula: see text]–300, and with [Formula: see text], [Formula: see text]–297 are also studied. The present study will be useful in the synthesis of superheavy elements [Formula: see text] by using the actinide based reactions with stable projectiles heavier than [Formula: see text]Ca.

Comparison of alpha decay with fission for isotopes of superheavy nuclei Z = 124

We have studied the [Formula: see text]-decay properties of superheavy nuclei (SHN) [Formula: see text] in the range [Formula: see text] using the Coulomb and proximity potential model for deformed nuclei (CPPMDN). The calculated [Formula: see text] half-lives agree with the values computed using the Viola–Seaborg systematic, the universal curve of Poenaru et al. [Phys. Rev. C 83 (2011) 014601; 85 (2012) 034615] and the analytical formulas of Royer [J. Phys. G[Formula: see text] Nucl. Part. Phys. 26 (2000) 1149]. To identify the mode of decay of these isotopes, the spontaneous-fission half-lives were also evaluated using the semiempirical relation given by Xu et al. [Phys. Rev. C 78 (2008) 044329]. The calculated half-lives help to predict the possible isotopes of this superheavy element [Formula: see text]. As we could observe [Formula: see text] chain consistently from the nuclei [Formula: see text]124, we have predicted that these nuclei could not be synthesized and detected experimentally via [Formula: see text] decay as their decay half-lives are too small. The nuclei [Formula: see text]124 were found to have long half-lives and hence could be sufficient to detect them if synthesized in a laboratory.

Measurements of proton total reaction cross sections for 112,114,116,118,120,122,124Sn from 22 to 48 MeV

Using a standard beam attenuation technique, proton total-reaction cross sections (σR) were measured for seven even isotopes of tin (112,114,116,118,120,122,124Sn) from 22 to 48 MeV with a typical accuracy of 2–3%. Two parameterizations of the data are presented, one based on an expression for the nuclear transparency, and the other on a semiempirical relation that has recently been developed.

MEASUREMENT OF 79Br(n, 2n)78Br, 63Cu(n,2n)62Cu, 58Ni(n,2n)57Ni, 54Fe(n,2n)53Fe, 50Cr(n, 2n)49Cr AND 46Ti(n, 2n)45Ti REACTION CROSS-SECTIONS AT 14.7 MeV NEUTRON ENERGY

Cross-sections of the reactions 79 Br (n, 2n)78 Br , 63 Cu (n,2n)62 Cu , 58 Ni (n, 2n)57 Ni , 54 Fe (n, 2n)53 Fe , 50Cr(n, 2n)49Cr and 46 Ti (n, 2n)45 Ti induced by 14.7 MeV neutrons are measured with reference to 27Al(n, ∝)24 Na and 56 Fe (n, p)56 Mn reactions using activation technique and also derived theoretically using compound nucleus model, semiempirical relation and ALICE code. Accuracy around 5% was achieved in measurement of these reaction cross-sections which is better compared to existing literature values.

Conduction Band Parameters in GaSb from High-Temperature Transport Measurements

Measurements of resistivity and Hall coefficient as a function of magnetic field (0–3.2 Wb/m2) and temperature (25–200 C) have been made on samples of Te-doped GaSb. The results have been analyzed in terms of a two-conduction-band model with minima at Γ1 and L1, using the method reported by Kwan et al. This analysis yields a value for the Γ1–L1 band separation of 0.097 ± 0.002 eV, when linearly extrapolated to 0 K, and a temperature coefficient of −3.4 × 10−5 eV/K. The measurements of the Hall coefficient at 0.87 Wb/m2 and the zero-field resistivity have been extended to 360 C. These data have been analyzed using a four-band model (Γ1, L1X1, and Γ15 V), thus giving the temperature dependence of electron mobility in the Γ1 and L1 bands. The electron mobility values for the L1 band have then been fitted to a semiempirical relation, obtained by assuming appropriate scattering mechanisms.

Thermoelasticity and the Temperature Coefficient of Unperturbed Polymer Dimensions

The strain dependence of fe/f (ratio of the internal energy component of the force to the total retractive force) for a crosslinked, amorphous network is analyzed in terms of the C2 factor which appears in the semiempirical relation for rubber elasticity. Appropriate equations are derived and applied to literature data for several polymers and copolymers. The temperature coefficients of the mean square end to end distances thus obtained are often quite different from the values determined by averaging ƒe/ƒT at several extensions.