Direct mass measurement of the four-neutron halo nuclide 8He |
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Authors: | Ryjkov V L Brodeur M Brunner T Smith M Ringle R Lapierre A Ames F Bricault P Dombsky M Delheij P Lunney D Pearson M R Dilling J |
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Institution: | TRIUMF, 4004 Wesbrook Mall, Vancouver BC, Canada V6T 2A3. |
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Abstract: | A high-precision Penning trap mass measurement of the exotic 8He nuclide (T(1/2)=119 ms) has been carried out resulting in a reduction of the uncertainty of the halo binding energy by over an order of magnitude. The new mass, determined with a relative uncertainty of 9.2 x 10(-8) (deltam=690 eV) is 13 keV less bound than the previously accepted value. The mass measurement is of great relevance for the recent charge-radius measurement of 8He P. Mueller, Phys. Rev. Lett. 99, 252501 (2007).10.1103/PhysRevLett.99.252501]. The 8He mass is the first result from the newly-commissioned Penning trap: TITAN (TRIUMF's Ion Trap for Atomic and Nuclear science) at the ISAC (Isotope Separator and Accelerator) radioactive beam facility at TRIUMF. |
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