Browsing by Author "R. Garg"

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Candidates for twin chiral bands in Rh 102
(2014) D. Tonev; M.S. Yavahchova; N. Goutev; G. De Angelis; P. Petkov; R.K. Bhowmik; R.P. Singh; S. Muralithar; N. Madhavan; R. Kumar; M. Kumar Raju; J. Kaur; G. Mohanto; A. Singh; N. Kaur; R. Garg; A. Shukla; Ts. K. Marinov; S. Brant
Excited states in Rh102, populated in the fusion-evaporation reaction Zr94(B11,3n)Rh102 at a beam energy of 36 MeV, were studied using the Indian National Gamma Array spectrometer at Inter University Accelerator Center, New Delhi. The angular correlations and the electromagnetic character of some of the gamma-ray transitions observed were investigated in detail. A new chiral candidate sister band was found. Lifetimes of exited states in both chiral candidate bands of Rh102 were measured for the first time in the A∼100 mass region by means of the Doppler-shift attenuation technique. The derived reduced transition probabilities are compared to the predictions of the two quasiparticles plus triaxial rotor model. Both experimental results and calculations do not support the presence of static chirality in Rh102. © 2014 American Physical Society.
Check for chirality in 102Rh
(2012) D. Tonev; N. Goutev; M.S. Yavahchova; P. Petkov; G. De Angelis; R.K. Bhowmik; R.P. Singh; S. Muralithar; N. Madhavan; R. Kumar; M. Kumar Raju; J. Kaur; G. Mahanto; A. Singh; N. Kaur; R. Garg; A. Sukla; Ts.K. Marinov; S. Brant
Excited states in 102Rh, populated by the fusion-evaporation reaction 94Zr(11B,3n)102Rh at a beam energy of 36 MeV, were studied using the INGA spectrometer at IUAC, New Delhi. The angular correlations and the electromagnetic character of some of the gamma-ray transitions observed were investigated in details. A new chiral candidate sister band was found in the level-scheme of 102Rh. Lifetimes of exited states in 102Rh were measured by means of the Doppler-shift attenuation technique. The experimental results do not support the presence of static chirality in 102Rh. © 2012 American Institute of Physics.
Chilli anthracnose: A review of causal organism, resistance source and mapping of gene
(Springer India, 2014) R. Garg; M. Loganathan; S. Saha; B.K. Roy
Anthracnose disease is one of the major economic constraints to chilli production in tropical and subtropical regions of the world and it is gaining much attention towards causes of damage in the field. Growing understanding has been based on conventional methods of characterisation of Colletotrichum pecies and its interaction with the host but it was not clear enough to recognise the differentiation among species, host–pathogen relationship and genetics of resistance in chilli. In this chapter, emphasis has been made on t e evaluation of the isolates of Colletotrichum capsici causing chilli anthracnose for their morphological and cultural characteristics, pathogenic variability on chilli fruits and genetic diversity with the help of random amplified polymorphism (RAPD-PCR) analysis and designated into different major clusters. Simultaneously, screening of Capsicum genotypes against anthracnose for testing the resistance has been highlighted under in vitro condition. Further, on the basis of and the segregation ratio of resistance to susceptibility, gene controlling resistance at different fruit maturity stages has been discussed. More importantly, by QTL mapping, distribution of resistance gene/s located on chromosomes by using simple sequence repeats (SSR) primers, linkage groups are indicated. A number of complementary resistant component (host–parasitic interaction) controlled by one or multiple genes with small quantification effects have been emphasized. This information will be valuable to overcome the use of agrochemicals, impact of environmental factors and in the management of this serious threat to chilli through the development of resistant varieties as a donor candidate in commercial and resistance-breeding program. © Springer India 2014 This work is subject. All rights reserved.
Does chirality exist in nuclei? The case of 102Rh
(Bulgarian Academy of Sciences, 2015) M.S. Yavahchova; D. Tonev; N. Goutev; G. De Angelis; P. Petkov; R.K. Bhowmik; R.P. Singh; S. Muralithar; N. Madhavan; R. Kumar; M. Kumar Raju; J. Kaur; G. Mohanto; A. Singh; N. Kaur; R. Garg; A. Sukla; Ts.K. Marinov; S. Brant
Excited states in 102Rh, populated in the fusion-evaporation reaction 94Zr(11B, 3n)102Rh at a beam energy of 36 MeV, were studied using the INGA spectrometer at IUAC, New Delhi. A new chiral candidate sister band was found. Lifetimes of exited states in 102Rh were measured for the first time by means of the Doppler-shift attenuation technique. A new band was found in the level-scheme of 102Rh. 1 band with a negative parity.
Dynamic chirality in mass regions A=105 and A=130
(Institute of Physics Publishing, 2018) M.S. Yavahchova; D. Tonev; G. De Angelis; P. Petkov; N. Goutev; R.K. Bhowmik; R.P. Singh; S. Muralithar; N. Madhavan; R. Kumar; M. Kumar Raju; J. Kaur; G. Mohanto; A. Singh; N. Kaur; R. Garg; A. Shukla; R. Mateva; E. Geleva; B. Slavchev; S. Brant
Chiral symmetry is dichotomic and its spontaneous breaking by the axial angular momentum vector leads to a pair of degenerate ΔI = 1 rotational bands, called chiral doublet bands. In many cases the energy degeneracy of the chiral candidate bands has almost been observed but the transition probabilities of the analogue states have been found to be different. In the angular momentum region where chirality sets in the B(E2) values of the electromagnetic transitions deexciting analogue states of the chiral twin bands should be almost equal. Correspondingly the B(M1) values should exhibit staggering. Experimental data for two nuclei from different mass regions are compared with theoretical predictions. Exited states in 134Pr were populated in the fusion-evaporation reaction 119Sn(19F, 4n)134Pr, while excited states in 102Rh were populated in the fusion-evaporation reaction 94Zr(11B, 3n)102Rh. Our lifetime measurements and level-scheme investigations show that there are similarities in both chiral candidates nuclei related to dynamic chirality. © Published under licence by IOP Publishing Ltd.
Evidence of antimagnetic rotation in odd-A Cd105
(American Physical Society, 2010) Deepika Choudhury; A.K. Jain; M. Patial; N. Gupta; P. Arumugam; A. Dhal; R.K. Sinha; L. Chaturvedi; P.K. Joshi; T. Trivedi; R. Palit; S. Kumar; R. Garg; S. Mandal; D. Negi; G. Mohanto; S. Muralithar; R.P. Singh; N. Madhavan; R.K. Bhowmik; S.C. Pancholi
The lifetimes of the levels above spin 23/2⊃- in the negative-parity yrast band of Cd105 have been measured using the Doppler shift attenuation method. The obtained B(E2) values are small and show a decrease with an increase in spin. This establishes, for the first time, antimagnetic rotation (AMR) in an odd-A nucleus. An excellent agreement between the theoretical (semiclassical model) and experimental results along with a large I(2)/B(E2) ratio for the states strongly suggests that the structure of the levels beyond spin 23/2⊃- has the character of a twin-shears type AMR band resulting from the coupling of a pair of g9/2 proton holes with aligned h11/2 and (g7/2)2 neutron particles, along with a small contribution from the core rotation. © 2010 The American Physical Society.
Examples of dynamic chirality in nuclei
(EDP Sciences, 2018) M.S. Yavahchova; D. Tonev; N. Goutev; G. De Angelis; R.K. Bhowmik; R.P. Singh; S. Muralithar; N. Madhavan; R. Kumar; M. Kumar Raju; J. Kaur; G. Mahanto; A. Singh; N. Kaur; R. Garg; A. Sukla
In many cases the chirality was almost observed but the transition probabilities are different. This fact is clearly seen in the cases of 134Pr and 102Rh. In the case of chirality, the yrast and the side bands should be nearly degenerate. In the angular momentum region where chirality sets, the B(E2) values of the electromagnetic transitions deexciting analog states of the chiral twin bands should be almost equal. Correspondingly the B(M1) values should exhibit staggering. Our lifetime measurements in the cases of 134Pr and 102Rh and the theoretical analysis do not support static chirality. Chirality has mainly a dynamical character in both nuclei. In the present paper, we compare our results with the results for other chiral candidate nuclei, which fulfill static chirality conditions. © The Authors, published by EDP Sciences, 2018.
Glucose tolerance test in leprosy
(1990) R. Garg; J.K. Agrawal; H.S. Bajpai; G. Singh; P.K. Srivastava
[No abstract available]
Hormone profile in leprosy
(1989) R. Garg; J.K. Agarwal; G. Singh; H.S. Bajpai
[No abstract available]
Immunostimulatory cellular responses of cured Leishmania-infected patients and hamsters against the integral membrane proteins and non-membranous soluble proteins of a recent clinical isolate of Leishmania donovani
(2005) R. Garg; S.K. Gupta; P. Tripathi; S. Naik; S. Sundar; Anuradha Dube
Development of an effective immunoprophylactic agent for visceral leishmaniasis (VL) has become imperative due to the increasing number of cases of drug resistance and relapse. Live and killed whole parasites as well as fractionated and recombinant preparations have been evaluated for vaccine potential. However, a successful vaccine against the disease has been elusive. Because protective immunity in human and experimental leishmaniasis is predominantly of the Th1 type, immunogens with Th1 stimulatory potential would make good vaccine candidates. In the present study, the integral membrane proteins (IMPs) and non-membranous soluble proteins (NSPs), purified from promastigotes of a recent field isolate, Leishmania donovani stain 2001, were evaluated for their ability to induce cellular responses in cured patients (n = 9), endemic controls (n = 5) of visceral leishmaniasis (VL) and treated hamsters (n = 10). IMPs and NSPs induced significant proliferative responses (SI 6.3 ± 4.1 and 5.6 ± 2.3, respectively; P < 0.01) and IFN-γ production (356.3 ± 213.4 and 294.29 ± 107.6 pg/ml, respectively) in lymphocytes isolated from cured VL patients. Significant lymphoproliferative responses against IMPs and NSPs were also noticed in cured Leishmania animals (SI 7.2 ± 4.7 & 6.4 ± 4.1, respectively; P < 0.01). In addition, significant NO production in response both IMPs and NSPs was also noticed in macrophages of hamsters and different cell lines (J774A-1 and THP1). These results suggest that protective, immunostimulatory molecules are present in the IMP and NSP fractions, which may be exploited for development of a subunit vaccine for VL. © 2005 British Society for Immunology.
In a search for a chiral symmetry in 102Rh
(Institute of Physics Publishing, 2014) M.S. Yavahchova; D. Tonev; N. Goutev; P. Petkov; G. De Angelis; R.K. Bhowmik; R.P. Singh; S. Muralithar; N. Madhavan; R. Kumar; M. Kumar Raju; J. Kaur; G. Mohanto; A. Singh; N. Kaur; R. Garg; A. Sukla; Ts K. Marinov; S. Brant
Excited states in 102Rh were populated in the fusion-evaporation reaction 94Zr(nB, 3n)102Rh at a beam energy of 36 MeV, using the INGA spectrometer at IUAC, New Delhi. The angular correlations and the electromagnetic character of some of the γ-ray transitions observed in 102Rh were investigated in detail. A new candidate for a chiral twin band was identified in 102Rh for the first time.
Indications of octupole correlation in 84Sr
(Institute of Physics, 2023) Anuj; S. Kumar; Naveen Kumar; Neelam Rajput; K. Rojeeta Devi; Neeraj Kumar; C.V. Ahmad; Akashrup Banerjee; Aman Rohilla; C.K. Gupta; Anand Pandey; Ravi Bhushan; Unnati Gupta; S.K. Mandal; S.S. Bhattacharjee; Divya Arora; R. Garg; Indu Bala; Rakesh Kumar; R.P. Singh; S. Muralithar; V.V. Jyothi; Chandrani Majumder; Hariprakash Sharma; Anupriya Sharma; S.K. Dhiman
Excited states in the 84Sr nucleus were investigated via the 76Ge(12C,4n)84Sr reaction at a beam energy of 58 MeV. The de-excited γ-rays were detected using the Indian National Gamma Array (INGA) spectrometer at Inter-University Accelerator Center, New Delhi. Directional Correlation from Oriented (DCO) states ratio and the polarization asymmetry (Δ) measurements were done to confirm the spin-parity of the low-lying states. Eight new γ-ray transitions were placed in the level scheme of 84Sr. The systematic behaviour of energy staggering S(I) of the γ-band (Band 1 and Band 2) was compared with the γ-bands in the mass A ≈ 80 region and the nuclei of other mass regions with similar behaviour (odd-I down). The E1 character is confirmed for strong γ-ray transitions connecting Band 3 to the Yrast band. Comparison of new results such as B(E1)/B(E2) ratio, frequency ratio ω −/ω + and energy displacement ΔE in 84Sr with those of 72Se, 150Sm, 152Gd, 220Ra and 224Th nuclei suggests the presence of octupole correlations in 84Sr. © 2023 IOP Publishing Ltd
Investigation of chirality in the case of 102Rh
(Institute of Physics Publishing, 2016) M.S. Yavahchova; D. Tonev; N. Goutev; G. De Angelis; P. Petkov; R.K. Bhowmik; R.P. Singh; S. Muralithar; N. Madhavan; R. Kumar; M. Kumar Raju; J. Kaur; G. Mahanto; A. Singh; N. Kaur; R. Garg; A. Sukla; Ts. K. Marinov; R.R. Mateeva; S. Brant
Excited states in 102Rh were populated in the fusion-evaporation reaction 94Zr(11B, 3n)102Rh at a beam energy of 36 MeV using the INGA spectrometer at IUAC, New Delhi. The angular correlations and the electromagnetic character of some of the gamma-ray transitions observed were investigated in details. A new chiral candidate sister band was found. Lifetimes of exited states in 102Rh were measured using the Doppler-shift attenuation technique and the derived reduced transition probabilities are compared to the predictions of the Two Quasiparticles Plus Triaxial Rotor model. © Published under licence by IOP Publishing Ltd.
Level scheme investigation of 102Rh
(Institute of Physics Publishing, 2012) N. Goutev; M.S. Yavahchova; D. Tonev; G. De Angelis; P. Petkov; R.K. Bhowmik; R.P. Singh; S. Muralithar; N. Madhavan; R. Kumar; M. Kumar Raju; J. Kaur; G. Mahanto; A. Singh; N. Kaur; R. Garg; A. Sukla; Ts.K. Marinov; S. Brant
Excited states in102Rh were populated in the fusion-evaporation reaction 96Zr(11B, 3n)102 Rh. The angular correlations and the electromagnetic character of some of the gamma-ray transitions observed were investigated in detail. A new chiral candidate sister band was found in the level-scheme of 102Rh.
Lifetime measurements in 104Pd
(IOP Publishing Ltd, 2020) C. Majumder; H.P. Sharma; S. Chakraborty; S.S. Tiwary; R.P. Singh; S. Muralithar; Indu Bala; S.S. Bhattacharjee; R. Garg; Neelam; A. Sharma; P.V. Madhusudhana Rao
High spin states in 104Pd were populated via 94Zr(13C, 3nγ) fusion-evaporation reaction at a beam energy of 55 MeV. The Indian National Gamma Array was utilized to detect the de-exciting γ-rays. Lifetimes of states in the negative parity bands have been determined using theDoppler shift attenuationmethod. The present lifetime results suggest a moderate quadrupole deformation (β2 ≈ 0.2) for the negative parity bands. The Woods-Saxon total Routhian surface calculations have also been carried out which predicted a similar deformation for these bands. In addition, lifetimes of states in the positive parity band have also been determined. Present results found in agreement with the earlier reported values of lifetimes and hence agreed with the antimagnetic rotational character of the band as interpreted earlier. © 2020 IOP Publishing Ltd Printed in the UK.
Lifetime measurements in mass regions A=100 and A=130 as a test for chirality in nuclear systems
(EDP Sciences, 2016) D. Tonev; M.S. Yavahchova; G. De Angelis; S. Brant; S. Frauendorf; P. Petkov; A. Dewald; Q. Zhong; D. Curien; N. Goutev; R.K. Bhowmik; R.P. Singh; S. Muralithar; N. Madhavan; R. Kumar; M. Kumar Raju; J. Kaur; G. Mahanto; A. Singh; N. Kaur; R. Garg; A. Sukla; E. Geleva; Ts. K. Marinov
Two odd-odd nuclei from the A ∼ 100 and A ∼ 130 regions, namely 102Rh and 134Pr have been studied in search for chiral doublet bands via 94Zr(11B,3n)102Rh and 119Sn(19F,4n)134Pr reactions, respectively. Two nearly degenerate bands built on the πg9/2 ⊗ νh11/2 configuration have been identified in 102Rh and on the πg11/2 ⊗ νh11/2 configuration for 134Pr. Lifetimes of excited nuclear states were measured using Dopplershift attenuation method and recoil distance Doppler-shift method. The deexciting gamma rays were registered by the Indian National Gamma Array for 102Rh and using the EUROBALL IV detector array with an inner Bismuth Germanate (BGO) ball for 134Pr, respectively. Polarization and angular correlation measurements have been performed to establish the spin and parity assignments for these bands. The derived reduced transition probabilities are compared to the predicitons of the two quasiparticles + triaxial rotor and interacting boson fermion-fermion models. © 2016 Owned by the authors, published by EDP Sciences.
No evidence of reduced collectivity in Coulomb-excited Sn isotopes
(American Physical Society, 2017) R. Kumar; M. Saxena; P. Doornenbal; A. Jhingan; A. Banerjee; R.K. Bhowmik; S. Dutt; R. Garg; C. Joshi; V. Mishra; P.J. Napiorkowski; S. Prajapati; P.-A. Söderström; N. Kumar; H.-J. Wollersheim
In a series of Coulomb excitation experiments the first excited 2+ states in semimagic Sn112,116,118,120,122,124 isotopes were excited using a Ni58 beam at safe Coulomb energy. The B(E2; 0+→2+) values were determined with high precision (∼3%) relative to Ni58 projectile excitation. These results disagree with previously reported B(E2↑) values [A. Jungclaus, Phys. Lett. B 695, 110 (2011).PYLBAJ0370-269310.1016/j.physletb.2010.11.012] extracted from Doppler-shift attenuation lifetime measurements, whereas the reported mass dependence of B(E2↑) values is very similar to a recent Coulomb excitation study [J. M. Allmond, Phys. Rev. C 92, 041303(R) (2015)PRVCAN0556-281310.1103/PhysRevC.92.041303]. The stable Sn isotopes, key nuclei in nuclear structure, show no evidence of reduced collectivity and we, thus, reconfirm the nonsymmetric behavior of reduced transition probabilities with respect to the midshell A=116. © 2017 American Physical Society.
Spectroscopy of the odd-odd chiral candidate nucleus 102Rh
(2014) M.S. Yavahchova; N. Goutev; D. Tonev; G. De Angelis; R.K. Bhowmik; P. Petkov; R.P. Singh; S. Muralithar; N. Madhavan; R. Kumar; M. Kumar Raju; J. Kaur; G. Mohanto; A. Singh; N. Kaur; A. Sukla; S. Brant; R. Garg; Ts.K. Marinov
Excited states in 102Rh were populated in the fusion-evaporation reaction 94Zr(11B, 3n)102Rh at a beam energy of 36 MeV, using the INGA spectrometer at IUAC, New Delhi. The angular correlations and the electromagnetic character of some of the 03B3-ray transitions observed in 102Rh were investigated in detail. A new candidate for achiral twin band was identified in 102Rh for the first time. © Owned by the authors, published by EDP Sciences, 2014.
Thyroid function in leprosy
(1990) R. Garg; J.K. Agarwal; G. Singh; H.S. Bajpai
[No abstract available]