Fundamental Interactions Physics & Instrumentation Conclusions Conveners: P. Mueller, J. Clark G. Savard, N. Scielzo

2 Short Term Fully utilize low energy beams from CARIBU for mass measurements, laser spectroscopic studies and decay experiments. Ideally, the space available for low energy experiments at CARIBU should be expanded to fully exploit these possibilities (NA6).

3 Initial focus of measurements with the CPT at CARIBU First measurements: 132 Sn and neighbors 130 Cd and neighbors Future measurements: go as neutron-rich as possible

4 Moving the CPT to CARIBU CARIBU

5 Laser Lab CARIBU AC HEPA Laser Enclosure (~ 6’ x 10’) Laser Table (~ 3’ x 7’) Ion Trap Collinear Beamline Tape Station Cf-252 source 80 mCi -> 1Ci High-resolution mass separator  m/m > 1/20000 Gas catcher RF Cooler & Buncher … starting in fall 2010

6 Beta-delayed neutron emission Plastic scintillator  n 94 Sr 95 Rb + 95 Rb  95 Sr*    94 Sr*  n 1-mm 3 trapped-ion sample and 1-ns timing resolution of detectors determines neutron momentum/energy to ~1% from time-of-flight of recoiling daughter ion intrinsic efficiency for MCP detectors can be ~100% many fission fragments available from the newly- developed CARIBU facility (an intense source of fission-fragment beams) at ANL Novel approach: determine neutron energies and branching ratios by detecting beta particles and recoil ions that emerge from ion trap Provide reliable data for: r-process nucleosynthesis, nuclear structure, nuclear reactor performance, modeling of environments where fission fragments are produced MCP ion detector Example Q = 4.9 MeV t 1/2 = sec P n ≈ 9%

7 Short Term Utilize ATLAS intensity upgrade (Phase I) for improved beta decay correlation experiments and weak interaction studies by increased production rate of light isotopes close to stability (e.g. 6 He, 8 Li, 14 O, 18 Ne ) (FI4). Phase II upgrade, in particular the recoil separator, would significantly improve production and separation of these isotopes.

8 Beta-neutrino correlation in 8 Li DSSD Plastic scintillator    8 Li + 8 Li  8 Be*     Neutrino momentum/energy can be determined from   and recoiling 8 Be momentum/energy   momentum/energy measured from DSSD and plastic scintillator detector 8 Be momentum/energy determined from  particle break- up… with no recoil,  particles would have same energy and would be back-to-back. With recoil, energy difference can be up to 730 keV and the angle can deviate by as much as ±7 0 Low mass of 8 Li and Q ≈ 13 MeV lead to large recoil energies of 12 keV which makes the correlation easier to measure. Other  correlation measurements have had to deal with recoil energies of only keV. Beta-neutrino correlation measurement takes advantage of 1 mm 3 trapped ion sample and position and energy resolution of double-sided silicon strip detectors to precisely reconstruct momentum vectors of all emitted particles (including neutrino!)

9 Beta-Decay Study with Laser Trapped 6 He 6 He trapping rate: 1  10 4 s -1, 2  10 5 coincidence events in 15 min:  a = ± week:  a/a = 0.1% Simulated time-of-flight signal Standard Model New Physics 6 He yields: ATLAS: 1  10 7 s -1 CENPA: ~1  10 9 s -1 SARAF / SPIRAL2: ~1  s -1

10 Medium Term Improve isotope separation and overall transmission of the ion transfer line after the gas catcher into the triangle room. This would enable mass measurements closer to the proton drip line ( 65 As) once the CPT is moved back to its previous location (NA2). This upgrade also would improve correlation studies and decay experiments possible at that location (FI4).

11 Moving the CPT to CARIBU CARIBU

12 Long Term Add gas catcher and low-energy beam-line behind recoil separator for studies of very proton rich isotopes (e.g. around 100 Sn, requires Phase II). Provide experimental area to accommodate low-energy beam experiments, e.g., in the ATSCAT area. Support high precision measurements of basic nuclear properties of isotopes close to stability (on the proton rich side) to enable future high precision measurement far off stability at FRIB, e.g., measurements of T=2 superallowed beta decays.

13 Moving the CPT to CARIBU CARIBU Recoil Separator

14 T=2 nuclei present an alternative way to check Isospin breaking corrections Bhattacharya et al., PRC 77, (2008)

15 Long Term Find a stronger source for 225 Ra for improved EDM experiment that will be truly statistics limited (FI9).

16 Search for EDM of 225 Ra Transverse cooling Oven: 225 Ra (+Ba) Zeeman Slower Optical dipole trap EDM probe Advantages: Large enhancement: EDM(Ra) / EDM(Hg) ~ 200 – 2000 Efficient use of 225 Ra atoms High electric field (> 100 kV/cm) Long coherence times (~ 100 s) Negligible “v x E” systematic effect