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41.
Jagbir Singh Harjeet Kaur A. Sharma J. Goswamy D. Mehta Nirmal Singh P. N. Trehan E. S. Paul R. K. Bhowmik 《Zeitschrift für Physik A Hadrons and Nuclei》1986,356(2):125-132
High spin states of 121Te, populated in the 114Cd (11B, p3n) reaction, have been studied through γ-ray spectroscopy. The level scheme has been established up to Jπ = 51/2?. Three-quasiparticle states, based on the πg 7/2 2 ? vh11/2 and πg 7/2d5/2 ? vh11/2 configurations, have been identified. A favoured 39/2? state is suggested to be the fully aligned [πg7/2 2]6 + ? [vh 11/2 3]27/2? yrast non-collective oblate configuration. This assignment is supported by Total Routhian Surface (TRS) calculations which also suggest a similar oblate assignment to the states at Jπ = 21/2? and 23/2?. A higher 47/2? state is also found and is suggested to be the fully aligned [πg7/2 2]6+ ? [vh 11/2 5]35/2? configuration. 相似文献
42.
A. Dhal R. K. Sinha P. Agarwal S. Kumar Monika B. B. Singh R. Kumar P. Bringel A. Neusser R. Kumar K. S. Golda R. P. Singh S. Muralithar N. Madhavan J. J. Das A. Shukla P. K. Raina K. S. Thind A. K. Sinha I. M. Govil P. K. Joshi R. K. Bhowmik A. K. Jain S. C. Pancholi L. Chaturvedi 《The European Physical Journal A - Hadrons and Nuclei》2006,27(1):33-36
High-spin states in 78Kr have been studied via the 63Cu (19F, 2p2n)78Kr reaction at a beam energy of 60 MeV using the Indian National Gamma Array (INGA). In this nucleus, lifetimes have been
measured upto the Iπ=22+ level in the yrast positive-parity band and upto the Iπ=15- level in the negative-parity band using the Doppler Shift Attenuation Method (DSAM). The deduced transition quadrupole moments
Qt's are found to decrease with rotational frequency for both the bands. 相似文献
43.
V. Ravi Kumar B. V. Thirumala Rao V. Lakshminarayana T. Seshi Reddy M. L. N. Raju K. L. Narasimham S. Lakshminarayana K. Prema Chand B. Mallikarjuna Rao K. Parthasaradhi R. K. Bhowmik S. Muralithar R. P. Singh G. O. Rodrigues 《Zeitschrift für Physik A Hadrons and Nuclei》1995,351(3):249-258
High spin states are populated in102Ag using the reaction16O+89Y with projectile energies in the energy range 60–80 MeV. Gamma multipolarities are inferred from DCO ratios and coincidence relationships are established among the gamma rays assigned to102Ag. A comprehensive level scheme is constructed with four band systems, two of positive parity and the other two of negative parity. The present study extended spins upto 19– in the main negative parity band. A new band is populated in the present work and is similar to the one observed in106Ag.The authors wish to thank and record their appreciation to Dr. S.K. Parthasaradhi, VECC, Calcutta for preparing the target used in this experiment. The authors gratefully acknowledge useful discussions with Dr. Rakhesh Popli. The authors record their grateful thanks to Prof. A.P. Patro and Prof. G.K. Mehta, former and present directors of the Nuclear Science Centre, for their interest in this work, helpful discussions and providing excellent facilities. The authors also thank Dr. S.K. Datta of the Nuclear Science Centre for his continued interest and helpful discussions and accelerator staff of N.S.C. for their efficient services in delivering the beam. Grateful thanks are also due to the University Grants Commission for providing financial support. 相似文献
44.
G. Mukherjee P. Joshi S. N. Roy S. Datta R. P. Singh S. Muralithar R. K. Bhowmik 《Zeitschrift für Physik A Hadrons and Nuclei》1997,359(2):111-112
The nucleus 73 Se was studied by the reaction 51 V(28 Si,αpn)73 Se. The level scheme extended upto $\frac{{41}} {2}\bar h $ in both +ve and ?ve parity bands with 10 new transitions placed in the level scheme. Lifetimes of 17 high spin states measured by DSAM. The transitional quadrupole moment is found to drop down after the band crossing suggesting a less deformed configuration. At the band crossing region, Q t increases suddenly in both +ve and ?ve parity bands. It is argued that the +ve parity band is a decoupled band. 相似文献
45.
46.
47.
Bappaditya Bhowmik 《Archiv der Mathematik》2010,95(6):575-581
We consider functions that map the open unit disc conformally onto the complement of a bounded convex set. We call these functions
concave univalent functions. In 1994, Livingston presented a characterization for these functions. In this paper, we observe
that there is a minor flaw with this characterization. We obtain certain sharp estimates and the exact set of variability
involving Laurent and Taylor coefficients for concave functions. We also present the exact set of variability of the linear
combination of certain successive Taylor coefficients of concave functions. 相似文献
48.
We propose a new self-assembly based strategy for the design of novel lanthanide based luminescent materials. In this approach a europium hydrogel is prepared and sensitization is achieved by doping the gel with pyrene in a non-coordinated fashion. 相似文献
49.
Alexi K. Nedeltchev Haesook Han Pradip K. Bhowmik 《Journal of polymer science. Part A, Polymer chemistry》2010,48(20):4408-4418
Several novel poly(pyridinium salt)s with heterocyclic pyridine moieties in their backbones with tosylate and triflimide counterions were prepared by either ring‐transmutation polymerization reaction of phenylated‐bis(pyrylium tosylate) with isomeric pyridine diamines of 4‐phenyl‐2,6‐bis(4‐aminophenyl)pyridine in dimethyl sulfoxide (DMSO) for 48 h at 130–140 °C or by metathesis reaction of the respective tosylate polymers with lithium triflimide in DMSO at about 60 °C. Their chemical structures were characterized by FTIR, 1H, 13C NMR spectroscopy, and elemental analysis. Their number‐average molecular weights (Mn) were in the range of 8,000–51,000 and their polydispersities in the range of 1.18–2.13 as determined by gel permeation chromatography. They had excellent thermal stabilities of 340–458 °C and high glass transition temperatures >200 °C. As they showed good solubilities in common organic solvents, their solution properties were also characterized for their lyotropic liquid‐crystalline properties with polarizing optical microscopy (POM) studies. Their photoluminescent properties were examined by using a spectrofluorometer in both solution and solid states. Their quantum yields were rather low, which were in the range of 1.3–2.0%. Additionally, hand‐drawn fibers from the melts were examined to determine their morphologies with a number of microscopic techniques including POM, scanning electron microscopy, and transmission electron microscopy. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2010 相似文献
50.
R.P. Singh R.K. Bhowmik S.S. Ghugre S.B. Patel 《The European Physical Journal A - Hadrons and Nuclei》2000,7(1):35-40
High spins states in 99Rh were populated via the 66Zn(37Cl, 2p2n)99Rh reaction at an incident beam energy of 130 MeV. Seventeen new transitions have been observed in the present study and the
level scheme has now been extended up to a spin of J∼ 25ħ and an excitation energy of about E
x∼ 10 MeV. The observation of a positive parity E2 cascade based on the 9/2+ isomeric level is suggestive of collective behaviour in this nucleus up to high spins. Spherical shell model (within restricted
model space) and Cranked shell model calculations were performed to obtain an insight into the observed level structure. The
new collective band observed up to a spin of J∼ 25ħ is suggested to be based on (πg
9/2
3) ⊗ (νg
7/2
2) quasi-particle excitations.
Received: 12 July 1999 / Revised version: 14 September 1999 相似文献