Publications by authors named "Deleplanque M"
The lifetime of the 2_+(1) state in 16C has been measured with the recoil distance method using the 9Be(9Be,2p) fusion-evaporation reaction at a beam energy of 40 MeV. The mean lifetime was measured to be 11.7(20) ps corresponding to a B(E2;2_+(1)-->0+) value of 4.
View Article and Find Full Text PDFWe have developed a new method to study the order-to-chaos transition in rotational nuclei. Correlations between successive gamma rays are used to determine the average complexity of the intermediate levels and thereby the ratio of the interaction potential between levels to the level spacing. The measured ratios, 0.
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- The Doppler shift attenuation method was used to measure the lifetimes of states in the positive parity band of 106Cd, revealing a decrease in B(E2) transition rates as spin increases.
- Cranking and semiclassical model calculations indicate that the observed band has shears-type characteristics due to the coupling of g(9/2) proton holes and aligned pairs of h(11/2) and g(7/2) neutrons.
- This study provides the first clear evidence for "antimagnetic" rotation in nuclear physics.
We have made the first clear measurements of rotational damping widths in nuclei. In a mixture of three Yb nuclei, these widths are 300 +/- 60 keV between 1.2 and 1.
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- High-angular-momentum states in 108Cd were created through a specific nuclear reaction using nickel and calcium at a beam energy of 207 MeV.
- Gamma rays emitted during this process were detected with the Gammasphere array.
- The study revealed a rotational band with unique properties, indicating a significant deformity in the nucleus, with a major-to-minor axis ratio exceeding 1.8:1, making it one of the most deformed nuclei recorded so far.
A superdeformed rotational band has been identified in 36Ar, linked to known low-spin states, and observed to its high-spin termination at Ipi = 16(+). Cranked Nilsson-Strutinsky and spherical shell model calculations assign the band to a configuration in which four pf-shell orbitals are occupied, leading to a low-spin deformation beta(2) approximately 0.45.
View Article and Find Full Text PDFTest of Delta I=2 staggering in the superdeformed bands of 194Hg.
Phys Rev C Nucl Phys
November 1996
Superdeformation in 193Pb and the effects of the N=7 intruder orbital.
Phys Rev C Nucl Phys
February 1995