ISOLDE Workshop and Users meeting 2019 Geneva Switzerland

ISOLDE Workshop and Users meeting 2019, Geneva, Switzerland Search for physics beyond the Standard Model with radioactive beams Dinko Atanasov dinko. atanasov@cern. ch CERN, Experimental Physics department on behalf of the WISAr. D collaboration

Contents Motivation The WISAr. D experiment at ISOLDE/CERN Proof-of-principle experiment Preliminary results Outlook 2

Standard Model and New Physics Standard Model (SM) Julia Woithe, Gerfried J Wiener and Frederik F Van der Veken Phys. Educ. 52 (2017) 034001 Image Credits: Philippe Mouche (https: //cds. cern. ch/record/1708847), ESA and the Planck Collaboration 3

Standard Model and New Physics Standard Model (SM) New Physics (beyond SM) Energy frontier Ø LHC… Precision frontier Ø Nuclear beta decay Cosmic frontier Ø Planck… e+ q nucleus n e Julia Woithe, Gerfried J Wiener and Frederik F Van der Veken Phys. Educ. 52 (2017) 034001 Image Credits: Philippe Mouche (https: //cds. cern. ch/record/1708847), ESA and the Planck Collaboration 4

Weak interaction in the Standard Model Present structure: * Vector-Axial Vector interaction CV 1; CA = -1. 27 * maximal parity violation CV’ = CV & CA’ = CA * no Scalar (S) or Tensor (T) components CS = CS’ = CT’ = CP’ 0 * no time reversal violation all C’s are real (CA/CV from n-decay) (except for the CP-violation included in the CKM matrix) J. D. Jackson et al, Nuclear Phys. 4 (1957) 206; A. Garcìa et al, Hyperfine Interactions 129 (2000) 237 5

Observables in the nuclear beta decay Decay rate e+ q phase-space factor beta-neutrino angular correlation coefficient M. Gonzalez-Alonso & Naviliat-Cuncic, Phys. Rev. C 94 (2016) 035503 nucleus ne Fierz interference term 6

Observables in the nuclear beta decay Decay rate e+ q phase-space factor beta-neutrino angular correlation coefficient nucleus ne Fierz interference term Pure Fermi transitions Ø S=0: Spin of leptons antiparallel SM: vector current: • Preferred emission angle: θ = 0° • Maximum recoil energy NP: scalar current: • Preferred emission angle: θ = 180° • Minimum recoil energy M. Gonzalez-Alonso & Naviliat-Cuncic, Phys. Rev. C 94 (2016) 035503 7

Observables in the nuclear beta decay Decay rate e+ q Pure Fermi transitions Ø ! Fierz interference term TE beta-neutrino angular correlation coefficient ne O N phase-space factor nucleus Pure Gamow-Teller transitions Ø S=0: Spin of leptons antiparallel S=1: Spin of leptons parallel SM: vector current: • Preferred emission angle: θ = 0° • Maximum recoil energy NP: scalar current: • Preferred emission angle: θ = 180° • Minimum recoil energy M. Gonzalez-Alonso & Naviliat-Cuncic, Phys. Rev. C 94 (2016) 035503 SM: axial-vector current: • Preferred emission angle: θ = 180° • Minimum recoil energy NP: tensor current: • Preferred emission angle: θ = 0° • Maximum recoil energy 8

Indirect correlation measurements Ø Max recoil energy ~ ke. V β 32 Ar e+ q nucleus ne L. Hayen and N. Severijns / Computer Physics Communications 240 (2019) 152– 164 32 Cl 9

Indirect correlation measurements Ø Max recoil energy ~ ke. V β 32 Ar p Ø decays by -decay to 32 Cl which subsequently decays by proton emission to 31 S 32 Ar 31 S+p Ø Protons energies ~ several Me. V 32 Cl Scalar Vector Ø The energy of the emitted protons is subject to kinematic shift due to the recoiling daughter nucleus L. Hayen and N. Severijns / Computer Physics Communications 240 (2019) 152– 164 10

ISOLDE Experimental Hall HRS High Resolution Separator María J G Borge and Klaus Blaum, J. Phys. G: Nucl. Part. Phys. 45 (2018) 010301 Target area 11

ISOLDE Experimental Hall HRS High Resolution Separator María J G Borge and Klaus Blaum, J. Phys. G: Nucl. Part. Phys. 45 (2018) 010301 Target area 12

Proof-of-principle: detection setup GEANT 4 Simulation Beta detector* + Si. PM Catcher*** proton detectors planes** * Plastic scintillator; ** Silicon surface-barrier (thickness = 300 μm); *** Aluminized Mylar (thickness = 6. 7 μm) D. Atanasov et al in preparation. 13

Proof-of-principle: detection setup Energy shifts observed in the dominant vector contribution B. Blanck et al. CERN-INTC-2016 -050 (INTC-I-172); D. Atanasov et al in preparation. Detector Plane up-up up-down-up down-down GEANT 4 Simulation 14

Proof-of-principle: Results Proton Spectra in SINGLES November 2018 Ø Lower plate detectors § Energy shifts observed in all detectors due to the dead layer Ø Upper plate detectors § Proton energies shifted due to Catcher thickness (δE ~ 100 ke. V for the IAS) Gamow-Teller V. Araujo-Escalona et al submitted. IAS: Fermi transition 15

Proof-of-principle: Results Example energy shift of one detector (IAS) By means of Monte Carlo simulations: V. Araujo-Escalona et al submitted. 16

Outlook D. Schardt, K. Riisager ZPA 345 (1993) 265; E. G. Adelberger et al PRL 83 (1999) 1299; V. Cirigliano et al. , J. High. Energ. Phys. 1302 (2013) 046 O. Naviliat-Cuncic and M. Gonzalez-Alonso, Annalen der Physik 525 (2013) 600 T. Bhattacharya et al. , Phys. Rev. D 85 (2012) 054512 17

Outlook 90% CL D. Schardt, K. Riisager ZPA 345 (1993) 265; E. G. Adelberger et al PRL 83 (1999) 1299; V. Cirigliano et al. , J. High. Energ. Phys. 1302 (2013) 046 O. Naviliat-Cuncic and M. Gonzalez-Alonso, Annalen der Physik 525 (2013) 600 T. Bhattacharya et al. , Phys. Rev. D 85 (2012) 054512 Prospects for: - 0. 1 s on neutron lifetime - 0. 1 % for An, a. F and a. GT - abs. unc. of 0. 001 on b. GT - LHC: 14 Te. V, 300 fb-1. 18

Thank you! Ph. Alfaurt, V. Araujo-Escalona, P. Ascher, D. Atanasov, B. Blank, L. Daudin, X. Fléchard, M. Gerbaux, J. Giovinazzo, S. Grévy, T. Kurtukian-Nieto, E. Liénard, G. Quéméner, N. Severijns, S. Vanlangendonck, M. Versteegen, D. Zakoucky Funding: Ø ANR-18 -CE 31 -0004 -02, Ø European Union’s 7 th Framework Programme, Contract No. 262010 (ENSAR) Ø Flemish Fund for Scientific Research FWO