P-347 Measurements of octupole collectivity in Rn and Ra nuclei using Coulomb excitation Addendum Peter Butler, David Joss and Marcus Scheck on behalf.

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Presentation transcript:

P-347 Measurements of octupole collectivity in Rn and Ra nuclei using Coulomb excitation Addendum Peter Butler, David Joss and Marcus Scheck on behalf of ISOLDE-Darmstadt-GANIL-Groningen*-Guelph*-Jyvaskyla-Koln-Livermore- Leuven-Liverpool-Lund-Michigan*-C Michigan-Oslo-Rochester-Saclay-SAS- Warsaw-W Scotland-York collaboration *EDM programmes at ANL and TRIUMF

220Rn, 224Ra: comparison with theory Our measurements 1 2 3 4 5 1. Shneidman et al PRC 67 (2003) 014313 2. Robledo & Bertsch PRC 84 (2011) 054302 3. Rutz et al. NP A590 (1995) 680 4. Engel et al. PRC 68 (2003) 025501 5. Nazarewicz et al NP A429 (1984) 269

J Dobaczewski (Trento, 2010) Octupole enhanced atomic EDM moment V Spevak, N Auerbach, and VV Flambaum PR C 56 (1997) 1357 related to Q3 P,T-violating n-n interaction Schiff moment: energy splitting of parity doublet J Dobaczewski (Trento, 2010) Schiff moment enhanced by ~ 3 orders of magnitude in pear-shaped nuclei Search candidates are odd-A Rn [TRIUMF ] and Ra [Argonne, Groningen/ISOLDE] SKOL 224Ra Rn, Ra n,p Measure: Q3 in even-A Rn, Ra DE in odd-A Rn e

Signature of pear-shape: B(E3) rigid deformation radioactive beams radioactive targets vibrational Gaffney et al Nature 497 (2013) 199

Signature of pear-shape: rotational alignment Octupole vibrational Octupole deformed 3ħ 3ħ 0ħ 0ħ even-even odd-A

Rotational properties for even-even nuclei Octupole vibrational 219,221Rn ? 3ħ 0ħ Octupole vibrational 3ħ 221Ra: 100 keV 223,225Ra: 50 keV 227Ra: 100 keV 0ħ Octupole deformed Octupole vibrational 3ħ 221Th: >250 keV 223, 225, 227Th: ~ 50 keV 229Th: 150 keV 0ħ Octupole deformed JFC Cocks et al PRL 78 (1997) 2920, NP A645 (1999) 61

Plan of octupole Rn-Ra programme Published: B(E3)s in 220Rn, 224Ra Approved: B(E3)s in 222Rn, 222,226,228Ra Addendum, to measure: level schemes of unknown 224,226Rn – infer behaviour of 223,225Rn B(E3: 0+ – 3-) in 224Rn at 4 and 5 MeV/u B(E3: 0+ – 3-) in 226Rn at 5 MeV/u level scheme of 221Rn at 5 MeV/u – probably vibrational

IS475: 221Rn gamma-ray spectrum 219Ra-like or 223Ra –like? Spectrum taken in 24h, with 5.103 ions/s (UCx) at 2.8 MeV/u. Propose to re-measure with 3.105 ions/s (ThCx) at 5 Mev/u We propose to measure both g-rays and internal conversion electrons.

SPEDE: conversion electron spectrometer Resources: Mechanical design and manufacturing being made at JYFL. Liverpool has taken care of the front-end PCB design and manufacture. Timeline: SPEDE will be commissioned at JYFL. 8 days allocated by PAC. We aim to have detector and PCB ready for testing in Spring 2014. Manpower: J Pakarinen (Finnish Academy Fellow) +P Papadakis at Jyvaskyla PAB and G O’Neill (STFC project student) at Liverpool

1 shift set-up 1 shift 224Rn 4 MeV.A 1 shift change over Beam time request 1 shift set-up 1 shift 224Rn 4 MeV.A 1 shift change over 1 shift 224Rn 5 MeV.A 1shift change over 9 shifts 226Rn 5 MeV.A 3 shifts 221Rn 5 MeV.A 18 shifts in total Dedicated ThCx target

Importance of higher beam energies