Penning trap mass measurements on nobelium isotopes
- Dworschak, M.
- Block, M.
- Ackermann, D.
- Audi, G.
- Blaum, K.
- Droese, C.
- Eliseev, S.
- Fleckenstein, T.
- Haettner, E.
- Herfurth, F.
- P. Hessberger, F.
- Hofmann, S.
- Ketelaer, J.
- Ketter, J.
- J. Kluge, H.
- Marx, G.
- Mazzocco, M.
- N. Novikov, Y.
- Yu, N.
- R. Plass, W.
- Popeko, A.
- Rahaman, S. M. Wahidur
- Rodriguez, D.
- Scheidenberger, C.
- Schweikhard, L.
- G. Thirolf, P.
- K. Vorobyev, G.
- Wang, M.
- Weber, C.
DOIAbstract
The Penning trap mass spectrometer SHIPTRAP at GSI Darmstadt allows accurate mass measurements of radionuclides, produced in fusion-evaporation reactions and separated by the velocity filter SHIP from the primary beam. Recently, the masses of the three nobelium isotopes (252-254)No were determined. These are the first direct mass measurements of transuranium elements, which provide new anchor points in this region. The heavy nuclides were produced in cold-fusion reactions by irradiating a PbS target with a (48)Ca beam, resulting in production rates of the nuclei of interest of about one atom per second. In combination with data from decay spectroscopy our results are used to perform a new atomic-mass evaluation in this region
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