Browsing by Author "Abegg, R."

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    Gamow-Teller Strength from the 76Se(n,p)76As Reaction: Implication for the Double Beta Decay of 76Ge
    (Physical Review C, 1997) Helmer, R.L.; Punyasena, M.A.; Abegg, R.; Alford, W.P.; Celler, A.; El-Kateb, S.; Engle, J.; Frekers, D.; Henderson, R.S.; Jackson, K.P.; Long, S.; Miller, C.A.; Olsen, W.C.; Spicer, B.M.; Trudel, A.; Vetterli, M.C.
    Cross sections have been measured up to 35 MeV excitation for the 76Se(n,p)76As reaction at five laboratory angles between 0� and 15�. The incident neutron energy was 198 MeV. The distribution of Gamow-Teller (GT) strength at excitation energies less than 10 MeV was deduced by carrying out a multipole decomposition of the data. The GT strength below 6 MeV excitation was found to be less than 0.9 units, in qualitative agreement with a quasiparticle random-phase approximation calculation. The present results have been compared with data from the 76Ge(p,n)76As reaction to obtain an estimate of a lower limit for the lifetime of 76Ge for ?? decay. The estimate is in qualitative agreement with the measured lifetime.
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    Optical Design and Performance of the SASP Spectormeter at TRIUMF
    (Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1999) Walden, P.L.; Walton, T.G.; Miller, C.A.; Yen, S.; Abegg, R.; Auld, E.G.; Campbell, J.R.; Chakhalyan, J.; Churchman, R.; Duncan, F.; Falk, W.R.; Frekers, D.; Green, A.; Green, P.E.W.; Hartig, M.; Hausser, O.; Haddock, C.; Hicks, K.; Hutccheon, D.; Jones, G.; Korkmaz, Y.Ke.E.J.; Khan, N.; Ling, A.; Lobb, D.E.; Naqvi, S.I.H.; Olsen, W.C.; Opper, A.; Otter, A.; Punyasena, M.A.; Reeve, P.; Zhao, J.
    A new Q?Q-Clamshell magnetic spectrometer called SASP has been commissioned in the proton hall at TRIUMF. The principal optical characteristics are: a solid angle acceptance of 13.5 msr, a momentum bite of 25%, a momentum resolution of ?p/p=2?10?4, and a maximum central momentum of 720 MeV/c. We describe the optical design, the magnetostatic design, the magnetic field mapping procedure, and the performance of this instrument.