C. Rangacharyulu - Academia.edu (original) (raw)

Papers by C. Rangacharyulu

The Nature of Light: What are Photons? III, 2009

Physical Review C, 1979

ABSTRACT

Chinese Journal of Physics- Taipei-

Mirror symmetry in nuclei, as manifest in the properties of corresponding levels and transitions ... more Mirror symmetry in nuclei, as manifest in the properties of corresponding levels and transitions in conjugate nuclei has been a subject of several elaborate experimental investigations. It is now generally considered that nuclear wave functions may consist of small yet finite admixtures of excited nucleon components. Inclusions of these components would result in transition strengths different for the corresponding transitions in nuclei, and thus would account for the departures from the predictions of charge symmetry hypothesis in the frame work of nucleons only degrees of freedom. Quantitative estimates for selected cases will be presented.

Nuclear Physics and Gamma-Ray Sources for Nuclear Security and Nonproliferation, 2014

ABSTRACT The advent of MeV photon beam facilities from the Compton scattering of laser beams off ... more ABSTRACT The advent of MeV photon beam facilities from the Compton scattering of laser beams off ultra-relativistic electrons at modern synchrotron light sources offers a unique tool for nuclear science and technology research. The distinct spectrum with high intensities at the endpoint energies suggests several interesting applications in addition to photo nuclear physics studies. We present some examples for photons up to 15 MeV energies.

$Research paper thumbnail of Isobaric analog resonances in the ^{68}Zn(p,γ)^{69}Ga reaction$

Physical Review C, 1978

ABSTRACT

Physical Review C, 1991

... Laboratory, Saskatoon, Saskatchewan, Canada S7N OWO MA Lucas, AM Nathan,and DP Wells Universi... more ... Laboratory, Saskatoon, Saskatchewan, Canada S7N OWO MA Lucas, AM Nathan,and DP Wells University of I/lino~&amp;amp;amp;#x27;s, 1110 W. Green Street, Urbana, Illinois 61801 (Received 7 November 1990) The angular distributions for coherent ...

Few-Body Systems, 2008

ABSTRACT The test of the local hidden variable theories involving strongly interacting pairs of m... more ABSTRACT The test of the local hidden variable theories involving strongly interacting pairs of massive spin- hadrons, in a nearly loophole-free experimental setting is reported. The spin correlation function is deduced to be C exp(π/4) = −0.73 ± 0.08. This result is in agreement with non-local quantum mechanical prediction and it violates the Bell’s inequality of C Bell(π/4) ≥ −0.5 at a confidence level of 99.3%.

Canadian Journal of Physics, 1982

The resonances at Ep = 3.249 and 3.253 MeV in 64Zn(p,γ) are identified as fragments of the d5/2 i... more The resonances at Ep = 3.249 and 3.253 MeV in 64Zn(p,γ) are identified as fragments of the d5/2 isobaric analogue resonance from (p,p′γ) angular distributions. Gamma decay schemes and angular distributions are measured. In 65Ga, the level at 2.21 MeV is assigned a spin of Jπ = 5/2−. From angular distributions and symmetry potential considerations, the level at 2.82 MeV is considered to be the antianalogue state. The analogue–antianalogue transition strength is found to be compatible with single nucleon transfer data, thus showing that the interference effects from core polarized components arc negligible in this case.

Journal of Physics G: Nuclear and Particle Physics, 2004

Physical Review Letters, 1996

ABSTRACT Forward-angle coincident electroproduction cross sections of charged pions from 3He have... more ABSTRACT Forward-angle coincident electroproduction cross sections of charged pions from 3He have been measured at electron energies E0 = 855, 675, 600, and 555 MeV. The overall features of the data for energy transfers of omega = 370 to 430 MeV with pions detected along the momentum transfer axis are reproduced in terms of a microscopic model, including pole terms, final state rescattering and produced and preformed Delta resonances. Separation of the cross section into its longitudinal and transverse parts was performed at Q2 = 0.045 $GeV/c$2. The longitudinal part of the cross section in the pi+ channel does not contradict with the assumption of a preformed Delta++.

TOKY. The total cross section for the GAMMA HE4 --& gt; N N P P Reaction in theDELTA - resonance ... more TOKY. The total cross section for the GAMMA HE4 --& gt; N N P P Reaction in theDELTA - resonance region.

Physical Review Letters, 2016

M.Sumihama, J.K. Ahn, H. Akimune, Y. Asanot, W.C. Chang, S. Datét, H. Ejirit, H. Fujimura, M. Fuj... more M.Sumihama, J.K. Ahn, H. Akimune, Y. Asanot, W.C. Chang, S. Datét, H. Ejirit, H. Fujimura, M. Fujiwara, K. Hicks, T. Hotta, K. Imai, T. Ishikawa±, T. Iwata∓, H. Kawai×, K. Kino, H. Kohri, N. Kumagait, S. Makino⊗, T. Matsumura, N. Matsuoka, T. Mibe, M. Miyabe, M. Morita, N. Muramatsu, T. Nakano, M. Niiyama, M. Nomachi◦, Y. Ohashit, H. Ohkumat, T. Ooba×, D.S. Oshuev, C. Rangacharyulu•, A. Sakaguchi◦, T. Sato◦, P.M. Shagin÷, Y. Shiino×, H. Shimizu±, Y. Sugaya◦, H. Toyokawat, C.W. Wang, S.C. Wang, K. Yonehara, T. Yorita, M. Yosoi, R.G.T. Zegers∪

Physical Review Letters, 2020

We measured missing mass spectrum of the 12 C(γ, p) reaction for the first time in coincidence wi... more We measured missing mass spectrum of the 12 C(γ, p) reaction for the first time in coincidence with potential decay products from η ′ bound nuclei. We tagged an (η + p) pair associated with the η ′ N → ηN process in a nucleus. After applying kinematical selections to reduce backgrounds, no signal events were observed in the bound-state region. An upper limit of the signal cross section in the opening angle cos θ ηp lab < −0.9 was obtained to be 2.2 nb/sr at the 90% confidence level. It is compared with theoretical cross sections, whose normalization ambiguity is suppressed by measuring a quasifree η ′ production rate. Our results indicate a small branching fraction of the η ′ N → ηN process and/or a shallow η ′-nucleus potential.

AIP Conference Proceedings, 2001

ABSTRACT The Laser-Electron-Photon facility at SPring-8 (LEPS) is now taking data for all hadroni... more ABSTRACT The Laser-Electron-Photon facility at SPring-8 (LEPS) is now taking data for all hadronic reactions at compton-backscattered photon energies between 1.5 GeV and 2.4 GeV. A linearly polarized photon beam is incident on a liquid hydrogen target or nuclear targets. A large dipole spectrometer analyzes charged particles produced at forward angles. First results from SPring-8/LEPS will be presented with special emphasis on the study of photoproduction of ϕ mesons near threshold. Some prospects for the near future will also be presented and discussed in close connection with photoproduction of hyperons. © 2001 American Institute of Physics.

The Nature of Light: What are Photons? III, 2009

Physical Review C, 1979

ABSTRACT

Chinese Journal of Physics- Taipei-

Nuclear Physics and Gamma-Ray Sources for Nuclear Security and Nonproliferation, 2014

$Research paper thumbnail of Isobaric analog resonances in the ^{68}Zn(p,γ)^{69}Ga reaction$

Physical Review C, 1978

ABSTRACT

Physical Review C, 1991

Few-Body Systems, 2008

Canadian Journal of Physics, 1982

Journal of Physics G: Nuclear and Particle Physics, 2004

Physical Review Letters, 1996

Physical Review Letters, 2016

Physical Review Letters, 2020

AIP Conference Proceedings, 2001

From Atoms to Higgs Boson - Voyages in Quasi-Spacetime , 2019

The announcement in 2012 that the Higgs boson had been discovered was understood as a watershed m... more The announcement in 2012 that the Higgs boson had been discovered was understood as a watershed moment for the Standard Model of particle physics. It was deemed a triumphant event in the reductionist quest that had begun centuries ago with the ancient Greek natural philosophers. Physicists basked in the satisfaction of explaining to the world that the ultimate cause of mass in our universe had been unveiled at CERN, Switzerland. The Standard Model of particle physics is now understood by many to have arrived at a satisfactory description of entities and interactions on the smallest physical scales: elementary quarks, leptons, and intermediary gauge bosons residing within a four-dimensional spacetime continuum.
Throughout the historical journey of reductionist physics, mathematics has played an increasingly dominant role. Indeed, abstract mathematics has now become indispensable in guiding our discovery of the physical world. Elementary particles are endowed with abstract existence in accordance with their appearance in complicated equations. Heisenberg’s uncertainty principle, originally intended to estimate practical measurement uncertainties, now bequeaths a numerical fuzziness to the structure of reality. Particle physicists have borrowed effective mathematical tools originally invented and employed by condensed matter physicists to approximate the complex structures and dynamics of solids and liquids and bestowed on them the authority to define basic physical reality. The discovery of the Higgs boson was a result of these kinds of strategies, used by particle physicists to take the latest steps on the reductionist quest.
This book offers a constructive critique of the modern orthodoxy into which all aspiring young physicists are now trained, that the ever-evolving mathematical models of modern physics are leading us toward a truer understanding of the real physical world. The authors propose that among modern physicists, physical realism has been largely replaced—in actual practice—by quasirealism, a problematic philosophical approach that interprets the statements of abstract, effective mathematical models as providing direct information about reality. History may judge that physics in the twentieth century, despite its seeming successes, involved a profound deviation from the historical reductionist voyage to fathom the mysteries of the physical universe.