arXiv subjects
Publications and source records attributed to P. N. Deepak.
A model-independent irreducible tensor formalism which has been developed earlier to analyze measurements of $\vec{p}\vec{p}\to pp π^\circ$, is extended to present a theoretical discussion of $\vec{p}\vec{p}\to pp ω$ and the polarization of $ω$ in $pp\to pp \vecω$. The recent measurement of unpolarized differential cross section for $pp\to pp ω$ is analyzed using this theoretical formalism.
We present a partial-wave analysis of the polarization data for the reaction $\vec{p}\vec{p}\to ppπ^\circ$, based solely on the recent measurements at IUCF for this channel. The fit leads to a $χ^2$ per degree of freedom of 1.7. Methods for an improved analysis are discussed. We compare the extracted values to those from a meson exchange model.
A model-independent irreducible tensor approach to p(n,gamma)d is presented and an explicit form for the spin-structure of the matrix for the reaction is obtained in terms of the Pauli spin-matrices for the neutron and the proton. Expressing the multipole amplitudes in terms of the triplet --> triplet and singlet --> triplet transitions, we point out how the initial singlet and triplet contributions to the differential cross section can be determined empirically.
The singlet and triplet differential cross sections for pp-> pp pi^0 have been estimated for the first time at 325, 350, 375 and 400 MeV using the results of the recent experimental measurements [Phys. Rev. C 63, 064002 (2001)] of Meyer et al.
We show that it is possible to empirically partition the differential cross section for pp->pp pi0 into initial singlet and triplet differential cross sections in a model independent way which can be implemented using the existing technological capabilities at the PINTEX facility to study the reaction employing polarized beam or polarized target or both simultaneously.
The notion of spin squeezing has been discussed in this paper using the density matrix formalism. Extending the definition of squeezing for pure states given by Kitagawa and Ueda in an appropriate manner and employing the spherical tensor representation, we show that mixed spin states which are non-oriented and possess vector polarization indeed exhibit squeezing. We construct a mixed state of a spin 1 system using two spin 1/2 states and study its squeezing behaviour as a function of the individual polarizations of the two spinors.