S. Purushothaman
A5066531859- Nuclear physics research studies
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Particle accelerators and beam dynamics
- Astronomical and nuclear sciences
- X-ray Spectroscopy and Fluorescence Analysis
- Radiation Therapy and Dosimetry
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Atomic and Subatomic Physics Research
- Radiation Detection and Scintillator Technologies
- Quantum, superfluid, helium dynamics
- Superconducting Materials and Applications
- Astro and Planetary Science
- Radioactive contamination and transfer
- Particle Accelerators and Free-Electron Lasers
- Advanced Radiotherapy Techniques
- Mass Spectrometry Techniques and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Superconducting and THz Device Technology
- Advanced Chemical Physics Studies
- Nuclear materials and radiation effects
- Nuclear reactor physics and engineering
- Isotope Analysis in Ecology
GSI Helmholtz Centre for Heavy Ion Research
2014-2025
University of Cologne
2024
Indian Space Research Organisation
2015-2024
Ludwig-Maximilians-Universität München
2024
Tamil Nadu Veterinary and Animal Sciences University
2024
Translational Research Platform for Veterinary Biologicals (India)
2024
Justus-Liebig-Universität Gießen
2016-2023
University of Groningen
2019
Nara Women's University
2019
Imperial College London
2013
We have developed a stopping cell to be used at the FRS and Super-FRS (Super-conducting FRagment Separator) GSI Helmholtz Centre for Heavy-Ion Research Facility Antiproton Ion (FAIR), both in Darmstadt, Germany. The has volume with length of 1 m diameter 25 cm. It is aimed operation high-density helium gas (up 0.2 mg/cm3). Ours first realisation which required purity ensured by cryogenic temperatures. On exit side, ions are guided hole an RF carpet 4 electrodes per mm, operating frequency...
Mass measurements of fission and projectile fragments, produced via $^{238}\mathrm{U}$ $^{124}\mathrm{Xe}$ primary beams, have been performed with the multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS) Fragment Separator (FRS) Ion Catcher a resolving power (FWHM) up to 410 000 an uncertainty down $6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}$. The nuclides were separated in flight fragment separator FRS at 300 1000 MeV/u thermalized cryogenic stopping cell....
Mass measurements of the $^{69}$As, $^{70,71}$Se and $^{71}$Br isotopes, produced via fragmentation a $^{124}$Xe primary beam at FRS GSI, have been performed with multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS) Ion Catcher an unprecedented resolving power almost 1,000,000. For $^{69}$As isotope, this is first direct measurement. A uncertainty 22 keV was achieved only 10 events. $^{70}$Se 2.6 obtained, corresponding to relative accuracy $\delta$m/m = 4.0$\times 10^{-8}$, less...
A cryogenic stopping cell (CSC) has been commissioned with 238U projectile fragments produced at 1000 MeV/u. The spatial isotopic separation in flight was performed the FRS applying a monoenergetic degrader. For first time, operated exotic nuclei temperatures (70 to 100 K). helium gas density of up used, about two times higher than reached before for RF ion repelling structures. An overall efficiency 15%, combined survival and extraction 50%, 24 ms were achieved heavy α-decaying uranium...
211Po ions in the ground and isomeric states were produced via 238U projectile fragmentation at 1000 MeV/u. The spatially separated flight from primary beam other reaction products by fragment separator FRS. energy-bunched, slowed-down thermalized a gas-filled cryogenic stopping cell (CSC). They then extracted CSC injected into high-resolution multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS). excitation energy of isomer and, for first time, isomeric-to-ground state ratio...
The multinucleon transfer (MNT) reaction approach was successfully employed for the first time to measure isomeric ratios (IRs) of 211Po isomer (25/2+) and its ground state (9/2+) at IGISOL facility using a 945 MeV 136Xe beam impinged on 209Bi natPb targets. dominant production isomers compared corresponding states consistently revealed in α-decay spectra. Deduced IR populated through 136Xe+natPb found have an enhancement ≈1.8-times than that observed 136Xe+209Bi. State-of-the-art...
We present the first nuclear cross-section measurements of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mo stretchy="false">(</a:mo><a:mi mathvariant="normal">p</a:mi><a:mo>,</a:mo><a:mi>γ</a:mi><a:mo stretchy="false">)</a:mo></a:mrow></a:math> and (p,n) reactions on <f:math xmlns:f="http://www.w3.org/1998/Math/MathML"...
Long-lived isomeric states in 97Ag and 101−109In were investigated with the FRS Ion Catcher at GSI. In isotope 97Ag, a long-lived (1/2−) state was discovered, its excitation energy determined to be 618(38) keV. This is simultaneously first discovery of nuclear by multiple-reflection time-of-flight mass spectrometry. The measured energies compared large-scale shell-model calculations, which indicated importance core around 100Sn. Furthermore, advanced mean-field calculations for nucleus...
Several techniques are under development for image-guidance in particle therapy. Positron (β+) emission tomography (PET) is use since many years, because accelerated ions generate positron-emitting isotopes by nuclear fragmentation the human body. In heavy ion therapy, a major part of PET signals produced β+-emitters generated via projectile fragmentation. A much higher intensity signal can be obtained using β+-radioactive beams directly treatment. This idea has always been hampered low...
Direct mass measurements of neutron-deficient nuclides around the $N=50$ shell closure below $^{100}$Sn were performed at FRS Ion Catcher (FRS-IC) GSI, Germany. The nuclei produced by projectile fragmentation $^{124}$Xe, separated in fragment separator and delivered to FRS-IC. masses 14 ground states two isomers measured with relative uncertainties down $1\times 10^{-7}$ using multiple-reflection time-of-flight spectrometer FRS-IC, including first direct $^{98}$Cd $^{97}$Rh. A new...
Abstract A fast and reliable range monitoring method is required to take full advantage of the high linear energy transfer provided by therapeutic ion beams like carbon oxygen while minimizing damage healthy tissue due uncertainties. Quasi-real-time using in-beam positron emission tomography (PET) with positron-emitters a promising approach. The number implanted ions time for an unambiguous verification are decisive factors choosing candidate isotope. An experimental study was performed at...
Abstract Objective . Beams of stable ions have been a well-established tool for radiotherapy many decades. In the case ion beam therapy with 12 C ions, positron emitters 10,11 are produced via projectile and target fragmentation, their decays enable visualization emission tomography (PET). However, PET activity peak matches Bragg only roughly counting statistics is low. These issues can be mitigated by using short-lived emitter as therapeutic beam. Approach. An experiment studying precision...
Owing to the favorable depth-dose distribution and radiobiological properties of heavy ion radiation, beam therapy shows an improved success/toxicity ratio compared conventional radiotherapy. The sharp dose gradients very high doses in Bragg peak region, which represent larger physical advantage therapy, make it also extremely sensitive range uncertainties. use β+-radioactive beams would be ideal for simultaneous treatment accurate online monitoring through PET imaging. Since all...
Abstract The production of very neutron-rich nuclides heavier than fission fragments is an ongoing experimental challenge. Multi-nucleon transfer reactions (MNT) have been suggested as a method to produce these nuclides. By thermalizing the reaction products in gas-filled stopping cells, we can deliver them cooled high-quality beams decay, laser and mass spectrometry experiments. High precision will allow for first time universally unambiguously identify atomic proton numbers ions produced...