# Pramana

*E*

_{ u }...

*τ*) principal Lyapunov exponent (

*λ*

_{ p }) and coordinate-time (

*t*) principal Lyapunov exponent (

*λ*

_{ c }) for Reissner–Nordstrøm (RN) black hole (BH). We also compute their ratio. For RN space-time, it is shown that the ratio is ( λ p / λ c ) = r 0 / r 0 2 − 3 M r ...

^{131}Ce and

^{133}Pr have been measured using the recoil distance Doppler shift and Doppler shift attenuation methods. The yrast bands in

^{131}Ce and

^{133}Pr are based on odd decoupled neutron

*νh*

_{11/2}high Ω and proton

*π*

*h*

_{11/2}low Ω orbitals, respectively. The triaxiality parameter extracted from the experimentally...

*K*

^{ π }= 1

^{+}: 7 /2[404]

_{ π }⊗9 /2[624]

_{ ν },

*K*

^{ π }= 0

^{−}: 9 /2[514]

_{ π }⊗9 /2[624]

_{ ν }bands of

^{180}Ta and

*K*

^{ π }= 0

^{−}: 7 /2[404]

_{ π }⊗7 /2[503]

_{ ν }...

*μ*

_{m}) have been measured for undecylic acid (C

_{11}H

_{22}O

_{2}), lauric acid (C

_{12}H

_{24}O

_{2}), tridecylic acid (C

_{13}H

_{26}O

_{2}), myristic acid (C

_{14}H

_{28}O

_{2}), pentadecylic acid (C

_{15}H

_{30}O

_{2}) and palmitic acid (C

_{16}H

_{32}O

_{2}) using

^{57}Co,

^{133}Ba,

^{137}Cs,

^{60}Co and

^{22}Na emitted

*γ*radiation with energies 122, 356, 511, 662, 1170, 1275 and 1330 keV, respectively. The accurate values of the effective...

*X*-type initial states. A closed formula for time evolution of concurrence is presented for a pure state. It is shown that under the influence of dissipation non-zero entanglement...

^{248}Cf formed in the

^{16}O+

^{232}Th reactions. Postsaddle nuclear dissipation strength of (12–14) × 10

^{21}s

^{−1}was extracted for Cf nucleus by fitting the results...

*Pramana – J. Phys.*

**83**, 907 (2014) are used to study the elastic collision between two hydrogen-like atoms when both are in ground states by considering the system as a four-body Coulomb system in the centre of mass frame, in which all the Coulomb interaction terms in direct and exchange...

*e*

^{+}

*e*

^{−},

*ep*as well as CDF data, and on the other hand to the perturbative QCD calculations carried out in the framework of the modified...

*g*factors

*g*

_{∥},

*g*

_{⊥}and hyperfine structure constants

*A*

_{∥},

*A*

_{⊥}) and the local structure for the tetragonal Cu

^{2+}centre in trigonal ZnGeF

_{6}⋅6H

_{2}O crystal are theoretically studied using the perturbation formulae of these parameters for a 3

*d*

^{9}ion in tetragonally elongated octahedra. In the calculations, the contributions...