| 11. |
- HUGHES, JR, et al.
(författare)
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LIFETIME MEASUREMENT IN EXCITED AND YRAST SUPERDEFORMED BANDS IN HG-194
- 1994
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Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 72:6, s. 824-827
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Tidskriftsartikel (refereegranskat)abstract
- Nuclear level lifetimes have been measured in two superdeformed bands in Hg-194 using the Doppler-shift attenuation method. Average transition quadrupole moments derived from the life-times of an excited and yrast superdeformed bands are Q(t) = 17.6(30) and 17.2(20) eb, respectively. The Doppler shifts of the excited band relative to the yrast band indicate a slight difference in quadrupole moments [+4(5)%], assuming similar side feeding. These results imply that the second well is stable and rigid with respect to the particle excitation responsible for this excited band.
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| 12. |
- HUGHES, JR, et al.
(författare)
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LIFETIME MEASUREMENTS IN THE REGULAR DELTA-I = 1 OBLATE BAND IN PB-197
- 1993
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Ingår i: Physical Review C. Nuclear Physics. - 0556-2813 .- 1089-490X. ; 48:5, s. R2135-R2139
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Tidskriftsartikel (refereegranskat)abstract
- Lifetimes of states in the regular DELTAI = 1 band in 197Pb have been measured with the Doppler-shift attenuation method. Excited states in 197Pb were populated using the Sm-154(48Ca, 5n) reaction at E(b) = 210 MeV. The target consisted of 1 mg/cm2 Sm-154 evaporated onto a 10 mg/cm2 Au backing. Discernible lineshapes for gamma rays in the energy range 300 < E(gamma) < 500 keV in the regular band were observed in a spectroscopic study with the 20 Ge-detector array, HERA. Level lifetimes were obtained from a lineshape analysis. Averaged reduced transition strengths, B(M1) approximately 1.7 W.u. and B(E2) approximately 18 W.u., are deduced and these are compared with theoretical predictions for the suggested configuration of this band.
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| 13. |
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| 14. |
- Rendell, Alistair P, et al.
(författare)
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Quantum chemistry on parallel computer architectures : oupled-cluster theory applied to the bending potential of fulminic acid
- 1992
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Ingår i: Chemical Physics Letters. - 0009-2614 .- 1873-4448. ; 194:1-2, s. 84-94
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Tidskriftsartikel (refereegranskat)abstract
- We present a formulation of the singles and doubles coupled-cluster (CCSD) method suitable for distributed memory parallel computer architectures. Results from test calculations using up to 128 nodes of the Intel i860 hypercube are presented. Although the new algorithm is highly parallel, the asymptotic speed is quickly reached due to the input/output (IO) demands on the concurrent file system. To alleviate these IO problems, as well as disk storage requirements, we propose a “semi-direct” CCSD method whereby the atomic orbital integrals are evaluated in each iteration of the procedure in order to determine the contribution from certain terms. Using CCSD(T)/TZ2P optimized geometries, the calculations show that the Born-Oppenheimer ground-state potential energy surface yields a linear structure for fulminic acid. HCNO, in agreement with the semirigid bender analysis by Bunker, Landsberg and Winnewisser.
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| 15. |
- Szymanski, J. J., et al.
(författare)
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MEGA : A search for the decay mu –> e gamma
- 1994
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Ingår i: Intersections between particle and nuclear physics. Proceedings, 5th Conference, St. Petersburg, USA, May 31-June 6, 1994. ; , s. 789-792
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Konferensbidrag (refereegranskat)
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| 16. |
- VO, DT, et al.
(författare)
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SUPERDEFORMATION IN AU-191
- 1993
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Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 71:3, s. 340-343
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Tidskriftsartikel (refereegranskat)abstract
- A superdeformed band has been observed for the first time in an Au isotope. The reaction used was B-11 + W-186, demonstrating that very light ions can be used to populate superdeformed (SD) bands at high angular momentum. The band is assigned to 191Au. The gamma-ray energies are at the quarter-point energies of the 192Hg SD band, indicating that it is ''identical'' to that of 192Hg.
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