Institutional Repository of Institute of Modern Physics, CAS
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Reaction mechanism of B-8 breakup at the Fermi energy
No full text<span style="color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);">The longitudinal momentum distributions of Be-7 fragments in the breakup of B-8 on a carbon target have been measured at 36 MeV/u. The different mechanisms have been distinguished by coincidence measurements. The longitudinal momentum distributions of Be-7 fragments from both the stripping and the diffraction mechanisms are consistent with the results of noneikonal calculations and CDCC calculations. The full widths at half maximum of the longitudinal momentum distributions are 124 +/- 17 and 92 +/- 7 MeV/c for the stripping and diffraction components, respectively. The comparison with the different model calculations is discussed. It is crucial to separate the different reaction mechanisms experimentally to benchmark nuclear reaction theories.</span
Alpha decay of the new isotope U-215
No full text<span style="color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);">The new neutron-deficient isotope U-215 was produced in the complete-fusion reaction W-180((40) Ar, 5n)U-215. Evaporation residues recoiled from the target were separated in flight from the primary beam by the gas-filled recoil separator SHANS and subsequently identified on the basis of energy-position-time correlation measurement. The alpha- particle energy and half-life of U-215 were determined to be 8.428(30) MeV and 0.73(-0.29)(+1.33) ms, respectively.</span
The first electron cooling commissioning of12C3+beam at HIRFL-CSRe
No full text<span style="color: rgb(0, 0, 0); font-family: Arial, verdana, helvetica, sans-serif; line-height: 14px;">The partly stripped ions get loss in storage ring when the charge state changes through collision ionization by residual gas and capturing electrons from electron beam. It was found in the first electron cooling commissioning of</span><sup style="color: rgb(0, 0, 0); font-family: Arial, verdana, helvetica, sans-serif; line-height: 14px;">12</sup><span style="color: rgb(0, 0, 0); font-family: Arial, verdana, helvetica, sans-serif; line-height: 14px;">C</span><sup style="color: rgb(0, 0, 0); font-family: Arial, verdana, helvetica, sans-serif; line-height: 14px;">3+</sup><span style="color: rgb(0, 0, 0); font-family: Arial, verdana, helvetica, sans-serif; line-height: 14px;">beam at HIRFL-CSRe that the lifetime of 122 MeV/u</span><sup style="color: rgb(0, 0, 0); font-family: Arial, verdana, helvetica, sans-serif; line-height: 14px;">12</sup><span style="color: rgb(0, 0, 0); font-family: Arial, verdana, helvetica, sans-serif; line-height: 14px;">C</span><sup style="color: rgb(0, 0, 0); font-family: Arial, verdana, helvetica, sans-serif; line-height: 14px;">3+</sup><span style="color: rgb(0, 0, 0); font-family: Arial, verdana, helvetica, sans-serif; line-height: 14px;">beam is only 6.6 s shorter than expected, and the electron cooling effect is unobvious. The lifetime of</span><sup style="color: rgb(0, 0, 0); font-family: Arial, verdana, helvetica, sans-serif; line-height: 14px;">12</sup><span style="color: rgb(0, 0, 0); font-family: Arial, verdana, helvetica, sans-serif; line-height: 14px;">C</span><sup style="color: rgb(0, 0, 0); font-family: Arial, verdana, helvetica, sans-serif; line-height: 14px;">3+</sup><span style="color: rgb(0, 0, 0); font-family: Arial, verdana, helvetica, sans-serif; line-height: 14px;">at CSRe and its electron cooling time were calculated in this paper. The result shows that the vacuum pressure at the order of 10</span><sup style="color: rgb(0, 0, 0); font-family: Arial, verdana, helvetica, sans-serif; line-height: 14px;">-8</sup><span style="color: rgb(0, 0, 0); font-family: Arial, verdana, helvetica, sans-serif; line-height: 14px;">Pa causes severe</span><sup style="color: rgb(0, 0, 0); font-family: Arial, verdana, helvetica, sans-serif; line-height: 14px;">12</sup><span style="color: rgb(0, 0, 0); font-family: Arial, verdana, helvetica, sans-serif; line-height: 14px;">C</span><sup style="color: rgb(0, 0, 0); font-family: Arial, verdana, helvetica, sans-serif; line-height: 14px;">3+</sup><span style="color: rgb(0, 0, 0); font-family: Arial, verdana, helvetica, sans-serif; line-height: 14px;">beam loss at CSRe. The beam loss due to recombination and cooling effect is unapparent in comparison with the one by collision ionization. The calculation explains the accidental fast beam loss in the first electron cooling commissioning of</span><sup style="color: rgb(0, 0, 0); font-family: Arial, verdana, helvetica, sans-serif; line-height: 14px;">12</sup><span style="color: rgb(0, 0, 0); font-family: Arial, verdana, helvetica, sans-serif; line-height: 14px;">C</span><sup style="color: rgb(0, 0, 0); font-family: Arial, verdana, helvetica, sans-serif; line-height: 14px;">3+</sup><span style="color: rgb(0, 0, 0); font-family: Arial, verdana, helvetica, sans-serif; line-height: 14px;">beam at CSRe. ©, 2015, Atomic Energy Press. All right reserved.(7 refs)</span
