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Journal Articles

Azimuthal correlations of electrons from heavy-flavor decay with hadrons in $$p+p$$ and Au+Au collisions at $$sqrt{s_{NN}}$$ = 200 GeV

Adare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Yasuyuki*; Al-Bataineh, H.*; Alexander, J.*; Aoki, Kazuya*; Aphecetche, L.*; Aramaki, Y.*; et al.

Physical Review C, 83(4), p.044912_1 - 044912_16, 2011/04

 Times Cited Count:7 Percentile:49.81(Physics, Nuclear)

Measurements of electrons from the decay of open-heavy-flavor mesons have shown that the yields are suppressed in Au+Au collisions compared to expectations from binary-scaled $$p+p$$ collisions. Here we extend these studies to two particle correlations where one particle is an electron from the decay of a heavy flavor meson and the other is a charged hadron from either the decay of the heavy meson or from jet fragmentation. These measurements provide more detailed information about the interaction between heavy quarks and the quark-gluon matter. We find the away-side-jet shape and yield to be modified in Au+Au collisions compared to $$p+p$$ collisions.

Oral presentation

Nuclear moments of the radioactive isotope $$^{131}$$La determined by collinear fast-beam laser spectroscopy

Iimura, Hideki; Schuessler, H. A.*; Buchinger, F.*; Cocolios, T.*; Crawford, J. E.*; Gulick, S.*; Lee, J. K. P.*; Levy, C. D. P.*; Pearson, M.*; Lioubimov, V.*; et al.

no journal, , 

We report measurements of the hyperfine structure constants of $$^{131}$$La (N=74) as an initial step to further exploring the neutron deficient rare-earth region where a sudden onset of nuclear deformation is predicted theoretically around N=74. This work is an extension of our earlier off-line experiments on $$^{135,137-139}$$La to on-line laser spectroscopy. The radioactive isotope $$^{131}$$La (T$$_{1/2}$$=59 min) was produced by means of a spallation reaction using a proton beam from TRIUMF cyclotron. The hyperfine spectra were observed by using the method of collinear fast-beam laser spectroscopy. From the obtained hyperfine constants, the nuclear moments of $$^{131}$$La were derived. In order to arrive at an understanding of the nuclear structure of $$^{131}$$La, we have carried out particle triaxial-rotor calculations. The results from the calculation reproduce well the experimental values when a triaxial shape is assumed for $$^{131}$$La.

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