Author
R. Guigas
Bio: R. Guigas is an academic researcher from Karlsruhe Institute of Technology. The author has contributed to research in topics: Charge density & Neutron. The author has an hindex of 4, co-authored 4 publications receiving 83 citations.
Topics: Charge density, Neutron, Pion, Spin states, Neutron cross section
Papers
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TL;DR: In this paper, the absorption of stoppedπ− in181Ta and209Bi has been investigated by studying prompt and delayedγ-ray spectra, and absolute cross-sections for the yield of isotopes per capturedπ−, xn) reactions, as well as the relative probability of populating nuclear states of different spins have been measured for the hafnium and lead isotopes, respectively.
Abstract: The absorption of stoppedπ− in181Ta and209Bi has been investigated by studying prompt and delayedγ-ray spectra. Absolute cross-sections for the yield of isotopes per capturedπ− in (π−, xn) reactions, as well as the relative probability of populating nuclear states of different spins have been measured for the hafnium and lead isotopes, respectively. A spin as high as 20 has been observed in the production of204Pb. The ground-state rotational bands of the hafnium isotopes are excited to spin values up to 16. Neutron multiplicities as large as 15 have been observed for both targets. A neutron multiplicity of ≃8 is most probable for both tantalum and bismuth targets.
54 citations
TL;DR: In this paper, the energy and widths of pionic 3d-2p transitions of 30Zn, 32Ge, and 33As have been measured with a Ge detector.
Abstract: Energies and widths of pionic 3d-2p transitions of30Zn,32Ge, and33As have been measured with a Ge detector. The values of the 2p shifts obtained from the measuremente2p(Zn)=7.0±1.4keV,e2p(Ge)=5.5±0.9keV, ande2p(As)=4.6±0.9keV show a decreasing behaviour for largeZ, which is caused by an increasings-wave contribution as predicted by theory.
16 citations
TL;DR: In this article, a detector consisting of 54 NaI (Tl) modules is described for the detection of 20-1000 MeV photons, with an energy resolution of 5.5% at 130 MeV.
8 citations
TL;DR: The difference of the rms radii of the charge distribution of the oxygen isotopes was determined by a relative measurement of the muonic K-series X-rays as discussed by the authors, and it is r( 18 O) − r( 16 O) = (0.076 ± 0.005) fm.
5 citations
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TL;DR: In this paper, a set of nuclear quadrupole moments, Q, for the year-2001 was presented, and a major revision of the value or a considerable improvement of the accuracy was reported for 6 3Li, 7N, 19 9F (197 keV, I = 5/2), 11Na, 13Al, 21Sc, 22Ti, 26Fe (14 keV), I = 3/2 Mossbauer state), 31Ga, 32Ge, 77 34Se (250 keV) and 83Bi.
Abstract: A ‘year-2001’ set of nuclear quadrupole moments, Q, is presented. Compared to the previous, ‘year-1992’ set, a major revision of the value or a considerable improvement of the accuracy is reported for 6 3Li, 7N, 19 9F (197 keV, I = 5/2), 11Na, 13Al, 21Sc, 22Ti, 26Fe (14 keV, I = 3/2 Mossbauer state), 31Ga, 32Ge, 77 34Se (250 keV, I = 5/2 state), 35Br, 36Kr, 37Rb, 39Y, 40Zr, 100 45Rh, 50Sn (24 keV, I = Mossbauer state), 53I, 54Xe, 55Cs and 83Bi.
493 citations
TL;DR: In this paper, the pionic bound-state spectra of heavy nuclei were calculated from the lowest 1s orbits using the standard pion-nucleus optical potential, where the energy levels of the s-orbits (l=0) are shifted upward largely by the repulsive S-wave pion nucleus interaction, which reduces the fraction of π− staying inside the nucleus.
105 citations
TL;DR: In this article, a theoretical optical potential for pionic atoms based on the first and second-order terms of a many-body expansion on the number of ph excitations was constructed.
93 citations
TL;DR: The 1998 version of nuclear data sheets for A = 196 has been revised and updated on the basis of the experimental results from various decay and reaction studies before January 2006 as mentioned in this paper, and the experimental data for all known nuclei of A =196 (Os,Ir,Pt,Au,Hg, Tl,Pb,Bi,Po,At,Rn) have been reevaluated.
89 citations
TL;DR: In this article, the authors evaluated spectroscopic data and level schemes from radioactive decay and nuclear reaction studies for all nuclei with mass number A = 176 for all types of nuclei.
88 citations