Department of Physics and Astronomy

Education

• Post Doc - TRIUMF, Canada (2020) 

• PhD - Clemson University, USA (2018)

• MS - St. Xavier’s Campus, Tribhuvan University, Nepal (2012)

• BS - St. Xavier’s Campus, Tribhuvan University, Nepal (2008)

Research Interests

• Ion traps, trapping highly charged ions 

• Atomic spectroscopy for plasma diagnostics, study of nuclear effects in atomic transitions, and testing atomic theories

• Study of radiation effects and radiation therapy with x-ray sources

• X-ray and extreme-ultraviolet spectroscopy to study laboratory and astrophysical plasmas, and fundamental physics

• Atomic mass measurements of exotic nuclides

 List of Publications

• G. Gwinner and R. Silwal, “Tiny isotopic difference tests standard model of particle physics” Nature 606, 467-468 (2022)

• R.Silwal, et al., “Summit of the N=40 Island of Inversion: precision mass measurements and ab initio calculations of neutron-rich chromium isotope” Phys. Lett. B 833 137288 (2022)

• R Silwal, Dipti, E. Takacs, J. M. Dreiling, S. C. Sanders, A. C. Gall, B. H. Rudramadevi, J. D. Gillaspy, and Yu. Ralchenko, “Spectroscopic analysis of M- and N-intrashell transitions in Co-like to Na-like Yb ions” J. Phys. B: At. Mol. Opt. Phys. 54 245001 (2021)

• R. Silwal, S. F. Paul, B. K. Kootte, T. Joseph, R. Simpson, A. A. Kwiatkowski, G.  Gwinner, J. Dilling, and TITAN collaboration, “Ion simulations, recent upgrades and tests with TITAN’s cooler Penning trap”, (in press, ECRIS proceedings (2020))

• R. Silwal, A. Lapierre, J.D. Gillaspy, J.M. Dreiling, S.A. Blundell, Dipti, A. Borovik, Jr, G. Gwinner, A.C.C. Villari, Yu. Ralchenko, and E. Takacs, “Accurate determination of the isotopic change in nuclear charge radius from extreme ultraviolet spectroscopy of highly-charged ions of Xe”, Phys. Rev. A 101, 062512 (2020)

• Dipti, A. Borovik, Jr., R. Silwal, J.M. Dreiling, A.C. Gall, E. Takacs, and Yu. Ralchenko, “Dielectronic resonances of LMn and LNn (n ≥ 4) series in highly-charged M-shell tungsten ions”, Phys. Rev. A 101, 032503 (2020)

• Dipti, R. Silwal, J. M. Dreiling, S. C. Sanders, E. Takacs, Yu. Ralchenkoa, “Spectroscopic analysis of N-intrashell transitions in Rb-like to Ni-like Yb ions”, J. Phys. B: At. Mol. Opt. Phys. 53 145002 (2020)

• F. Dipti, S.W. Buechele, A. C. Gall, S. C. Sanders, C. I. Szabo, R. Silwal, E. Takacs and Yu. Ralchenko3 “Linear polarization of anisotropically excited x-ray lines from the n = 2 complex in he-like Ar¹⁶⁺”, J. Phys. B: At. Mol. Opt. Phys. 53 115701 (2020)

• A. C. Gall, F. Dipti, S. Buechele, S. C. Sanders, R. Silwal, C. Szabo, N. Brickhouse, Yu. Ralchenko, and E. Takacs, “Measurements of Linear Polarization of Satellite Transitions from Li- and Be- like Ar Ions", (Submitted JPHYSB-106041 (2020))

•  A C. Gall, A. R. Foster, R. Silwal, J.M. Dreiling, A.Borovik Jr., E. Kilgore, M. Ajello, J.D. Gillaspy, Yu. Ralchenko, and E. Takács, “EBIT Observation of Ar Dielectronic Recombination Lines near the Unknown Faint X-Ray Feature Found in the Stacked Spectrum of Galaxy Clusters”, Ap. J., 872 2 (2019)

• R.Silwal, A. Lapierre, J.D. Gillaspy, J.M. Dreiling , S.A. Blundell , Dipti, A. Borovik, Jr, G. Gwinner, A.C.C. Villari, Yu. Ralchenko, and E. Takacs, “Measuring the Variation in Nuclear Charge Radius of Xe Isotopes by EUV Spectroscopy of Highly-Charged Na-like Ions”, Phys. Rev. A 98, 052502 (2018).

• S.C. Sanders, R. Silwal, B.H. Rudramadevi, A.C. Gall, and E. Takacs, ^“High-resolution x-ray spectroscopy of highly charged tungsten plasma for potential fusion-device diagnostic tool”, NIM Phys. B 43147–54 (2018).

• R. Silwal, E. Takacs, J. M. Dreiling, J. D. Gillaspy, and Yu. Ralchenko, “Identification and Plasma Diagnostics Study of Extreme Ultraviolet Transitions in Highly Charged Yttrium”, Atoms 5, 30 (2017).

• A. Borovik, Jr., J. M. Dreiling, R. Silwal, Dipti, E. Takacs, J. Gillaspy, R. Lomsadze, V. Ovsyannikov, K. Huber, S. Schippers, A. Müller, and Yu. Ralchenko, “Dielectronic Resonances in Highly-Charged Heavy Ions Observed in Ion Traps”, J. Phys.: Conf. Ser. 875, 052026 (2017).