Robert V. F. Janssens

Education

Career

Research Interests

My main research interests lie in the study of nuclear structure at the limits of stability, in high-Z nuclei and in neutron-rich nuclei. Most recently, we have initiated a program to investigate shell structure in neutron-rich nuclei just above ⁴⁸Ca by combining a number of techniques and facilities. Our approach is one where we combine beta decay and intermediate-energy Coulomb excitation measurements performed at the NSCL with deep inelastic reactions or fusion-evaporation with radioactive targets carried out with Gammasphere at ATLAS. Another program at ATLAS uses Gammasphere to carry out so-called "unsafe" Coulomb excitation experiments on long-lived actinide nuclei in order to determine the important degrees of freedom responsible for the various excitations as a function of spin. I am also fascinated by the impact of structure on nuclear astrophysics processes and am participating in measurements in this area.

Over the years, I have supervised a number of graduate students who were based at ANL for their thesis research: D. Ye (U. Notre Dame, 1991), A.J.M. Plompen (Free U. Amsterdam, 1992), I.G. Bearden (Purdue U., 1993), D. Nisius (Purdue U., 1996), H. Amro (North Carolina State U., 1999), L.T. Brown (Vanderbilt U., 1999), K. Abu Saleem (Illinois Institute of Technology, 2002), X. Wang (U. Notre Dame, on-going).

Recent Publications

“REDUCED TRANSITION PROBABILITIES TO THE FIRST 2⁺ STATE IN ^52,54,56Ti AND DEVELOPMENT OF SHELL CLOSURES AT N = 32, 34”,
D.-C. Dinca, R. V. F. Janssens, et al., Phys. Rev. C 71, 041302(R) (2005)

“GAMMA-RAY SPECTROMETERS”, M. P. Carpenter and R. V. F. Janssens,
Chapter in Encyclopedia of Physics, 3rd Edition, eds. Rita G. Lerner and George L. Trigg (Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim 2005) pp. 875-877

“CHANGES IN ng_9/2 SHAPE POLARISATION ACROSS THE ODD NEUTRON-RICH Cr ISOTOPES”,
A.N. Deacon, S. J. Freeman, R. V. F. Janssens, et al., Phys. Lett. B 622, 151 (2005)

“STRENGTH OF OCTUPOLE CORRELATIONS IN THE ACTINIDES: CONTRASTING BEHAVIOR IN THE ISOTONES ²³⁷U AND ²³⁹Pu”,
S. Zhu, R. V. F. Janssens, et al., Phys. Lett. B 618, 51 (2005)

“ELUSIVE MAGIC NUMBERS”,
Robert V. F. Janssens, Nature 435, 897 (2005)

“YRAST STRUCTURE OF NEUTRON--RICH ⁵³Ti NUCLEUS”,
B. Fornal, S. Zhu, R. V. F. Janssens, et al., Phys. Rev. C 72, 044315 (2005)

“PHYSICS OF A RARE ISOTOPE ACCELERATOR”,
D. F. Geesaman, C. K. Gelbke, R. V. F. Janssens, and B. M. Sherrill, Annu. Rev. Nucl. Part. Sci., to appear in the 2006 volume

“SPECTROSCOPY OF THE ODD-ODD fp-SHELL NUCLEUS ⁵²Sc FROM SECONDARY FRAGMENTATION”,
A. Gade, R. V. F. Janssens,et al., Phys. Rev. C 73, 037309 (2006)

“CROSS-SHELL EXCITATION IN TWO-PROTON KNOCKOUT: STRUCTURE OF ⁵²Ca”,
A. Gade, R. V. F. Janssens, et al., Phys. Rev. C 74, 0211302(R) (2006)

“DECAY MODES OF ²⁵⁰No”,
D. Peterson, B. B. Back, R. V. F. Janssens,et al., Phys. Rev. C 74, 014316 (2006)

“ONE-NEUTRON KNOCKOUT IN THE VICINITY OF THE N = 32 SUB-SHELL CLOSURE: ⁹Be(⁵⁷Cr,⁵⁶Cr +g)X”,
A. Gade, R. V. F. Janssens, et al., Phys. Rev. C, accepted for publication

“LEVEL STRUCTURE OF THE NEUTRON-RICH ^56,58,60Cr ISOTOPES: SINGLE-PARTICLE AND COLLECTIVE ASPECTS”,
S. Zhu, A. N. Deacon, S. J. Freeman, R. V. F. Janssens, et al., Phys. Rev. C , submitted September (2006)