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## An interpretation of the rise of associated multiplicities with momentum transfer

### Pramana (1976-08-01) 7: 138-140 , August 01, 1976

We present an interpretation of the recently observed phenomenon of rise of associated multiplicity with momentum transfer as an overlap effect of two independent physical processes, the first one dominating the small momentum transfer region and the second one correspondingly the large angle region.

## Differential equation approach for the energy average of the scattering function

### Pramana (1976-11-01) 7: 316-318 , November 01, 1976

An exact differential equation is given to evaluate the energy average of the scattering function. The advantage of the differential equation as compared to the earlier methods based on series expansion is that one has to evaluate only single sums over the complex poles of the S-matrix. Using Wigner’s semicircle law for the distribution of the real parts of the poles of the scattering matrix, the earlier expression for the energy average of the scattering function is rederived.

## Non-leptonic weak decays of charmed baryons

### Pramana (1976-10-01) 7: 277-286 , October 01, 1976

It is shown that the Δ*C*_{h}=Δ*S* decays of a baryon sextuplet, triplet and singlet of SU (3), into meson and baryon, can provide simple tests of the iscspin and SU (3) transformation properties of the Δ*C*_{h}=Δ*S* non-leptonic interaction in the Glashow Iliopoulos-Maiani scheme.

## Entropy, information and Maxwell’s demon after quantum mechanics

### Pramana (1976-03-01) 6: 135-145 , March 01, 1976

The problem of the subjective nature of entropy and its relation to information and irreversibility is examined in the light of the quantum measurement problem. The main thesis of the paper is that state collapse during a measurement and hence entropy increase in the observed universe is seen by observers who are only able to observe a restricted manifold of states determined by their concepts, language, etc., in short by their level of perception. The thesis leads to the assertion that any universe with a structure must evolve.

## Sum rules for the baryon20, baryon20′ and meson 16-plet coupling constants in broken SU (4) and SU (3) symmetry

### Pramana (1976-05-01) 6: 259-271 , May 01, 1976

Sum rules for the coupling constants for D (*20*), B (*20′*) and P (*16*) are given taking into account first order breaking of SU (4) and SU (3) symmetries. The D (*20*) and B (*20′*) contain the usual 3/2^{+} baryon decuplet and 1/2^{+} baryon octet of SU (3), while the P (*16*) contains the usual pseudoscalar octet of pions, etc. These sum rules generalize the decuplet → octet + octet sum rules of broken SU (3 to a broken SU (4) symmetry scheme, in particular the charm SU (4) for hadrons. It is pointed out that, of the many sum rules, it may be possible to check some of them experimentally (see Section 5) and thus provide a test for an underlying SU (4 symmetry for strong interactions.

## A note on the elastic constants of sodium bromate from 350 K to 77 K

### Pramana (1976-01-01) 6: 19-24 , January 01, 1976

The elastic constants*C*_{11},*C*_{12} and*C*_{44} of sodium bromate single crystals have been evaluated using 10 MHz ultrasonic pulse echo superposition technique. The values are*C*_{11}=5.57_{8},*C*_{12}=1.07_{5},*C*_{44}=1.51_{0} (×10^{10} N/m^{2}) at 290 K and 6.35, 1.98 and 1.65 (×10^{10} N/m^{2}) at 77 K. The present room temperature values agree closely with the recent values of Gluyas*et al.* but the other earlier measurements show some scatter. A comparison between the elastic constants of sodium bromate and sodium chlorate is also made.

## Equation of state and temperature variation of the bulk modulus of the alkaline earth fluorides

### Pramana (1976-02-01) 6: 87-93 , February 01, 1976

The isotherms for the alkaline earth fluorides (CaF_{2}, SrF_{2} and BaF_{2}) have been computed using the expression for the total free energy of a crystal in the quasiharmonic approximation. The theoretical points for SrF_{2} and BaF_{2} have been compared with the points derived from Bridgman’s experimental relation.

The temperature variation of the isothermal bulk modulus of the alkaline earth fluorides has been worked out on the basis of Axe’s shell model. The theoretica points are compared with the points obtained from the temperature variation of the elastic constants data. It is found that the vibrational contribution to the temperature variation of the elastic constants in these crystals is significant.

## Thermonuclear reaction rates from (p, n) reactions

### Pramana (1976-07-01) 7: 6-16 , July 01, 1976

Thermonuclear reaction rates for the temperature range 1≤*T*_{9}≤5 have been extracted from experimentally measured (*p, n*) cross sections for^{45}Sc^{50}Ti,^{51}V,^{54}Cr,^{55}Mn and^{59}Co nuclides below 5 MeV bombarding energy. These reaction rates are important in the build-up of medium and heavy nuclides in the stellar evolution process and nucleosynthesis. To enhance the usefulness of these reaction rates in astrophysical calculations, they have been fitted to an analytic function of temperature, valid throughout the temperature range considered here.

## Comparison of high-temperature three-phonon resistivities from different theoretical models

### Pramana (1976-10-01) 7: 236-244 , October 01, 1976

We present a comparison of high-temperature three-phonon resistivities from the relaxation time methods due to Klemens, Callaway, and Debye, and the variational method due to Leibfried and Schlömann. All the calculations are based upon the same choice of anharmonic crystal potential; and hence the results are suitable for comparison on quantitative basis. We find that the resistivities in increasing order of magnitude come from the methods due to Klemens, Callaway Debye, and Leibfried and Schlömann respectively.