[Triumf-seminars] TRIUMF Seminar today at 14:00

[postmaster@admin.triumf.ca]

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Date/Time: Thu 2005-10-06 at 14:00

Location:  Auditorium          

Speaker:   Dieter Frekers (University  of Muenster, Germany)

Title:     Facets of (d,2He) charge-exchange reactions: From NN-scattering to astrophysics to double beta decay.

Abstract: In this talk results from the (d,^2He) reaction at intermediate energies are presented.  Here, the unbound di-proton system is referred to as ^2He, if the two protons couple to a  ^1S_0, T=1 state. The (d,^2He) probe appears as a powerful spectroscopic tool for studying charge-exchange reactions in the beta^+ direction. The key issue here will be the high resolution of order  40-100 keV, which provides new and sometimes rather unexpected insight into nuclear structure phenomena. The program has been launched at the AGOR Superconducting Cyclotron Facility at the KVI Groningen. By now it covers a wide field of physics questions ranging from few-body physics (measurement of the neutron-neutron scattering length a_{nn}), the structure of halo-nuclei (^6He,^7He), to questions pertaining to the dynamics of supernova explosions and nuclear synthesis (i.e. GT^+ distribution in pf-shell nuclei), and more recently to the measurements of double-beta decay matrix elements and the determination of half-lives of double-beta decaying nuclei. A good fraction of the presentation will be devoted to this subject, where the double-beta decay of ^48Ca and ^116Cd will be at the center of attention. New high-resolution (^3He,t) data from RCNP together with the (d,^2He) data will explain, why ^48Ca is so remarkably stable against double-beta decay.


Stimulants available 15 minutes before the talk.

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