1 / 6

Excited-state g -factor measurements: Recoil in Vacuum with CARIBU beams

Excited-state g -factor measurements: Recoil in Vacuum with CARIBU beams. Andrew Stuchbery Department of Nuclear Physics, The Australian National University Canberra, ACT 0200, Australia. Physics goal: nuclear structure between 100 Sn and 132 Sn. An example:

rashad
Download Presentation

Excited-state g -factor measurements: Recoil in Vacuum with CARIBU beams

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Excited-state g-factor measurements:Recoil in Vacuum with CARIBU beams Andrew Stuchbery Department of Nuclear Physics, The Australian National University Canberra, ACT 0200, Australia

  2. Physics goal: nuclear structure between 100Sn and 132Sn An example: g factors of n-rich isotopes between Z=40 and Z=50. Why are some g(2+) smaller than in the stable isotopes? Use RIV on CARIBU beams to extend and improve precision of data. ** Simultaneous measurement of B(E2) and g factor ** 252Cf + Gammasphere A.G. Smith et al. PLB 591, 55 (2004) Behavior of neutron-rich g factors

  3. RIV g-factor measurements : concept F = I + J 12C recoil J electron spin randomly oriented 132Te beam (qp,fp) scattered 132Te I nuclear spin aligned by reaction g ray emitted at angle (qg,fg) W(qg,fp-fg) = åkq Ö(2k+1) rkq(qp) Gk Fk Qk Dk*(fp-fg,qg,0) q0 • g factors from a B(E2) experiment • Measure azimuthal angular correlations – Gammasphere+ Hercules (say) Attenuation coefficient due to RIV: contains information about the nuclear moment

  4. RIV example with weak radioactive beams: 136Te 1. Apparatus: Clarion+Hyball at HRIBF 2. Correlation data give Gk values 3. Extracting g factors from Gk values Technique applicable for lifetimes ~ 1 ps <  < ~ 100 ps

  5. RIV in the A ~ 100 region @ ANU Proof of concept and field calibration: ~ 2 MeV/A Ru and Pd beams Heliotrope (poor man’s CD) 4 Ge detectors Azimuthal angular correlations Extracted attenuation coefficients Lines are empirical fits to where An excellent model fit can also be obtained 104Ru 96Ru

  6. Summary • Behavior of g factors in n-rich nuclei near A=100 contrasts with stable isotopes and is not well understood • RIV experiments measure azimuthal angular correlations under conditions similar to a B(E2) measurement • Our understanding of the RIV fields is sufficient to make g-factor measurements on cases accessible with CARIBU

More Related