Experimental determination of isospin mixing in nuclear states;

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Presentation transcript:

Experimental determination of isospin mixing in nuclear states; the cases of 52Mn, 59Cu, 71As and 104gAg e+ ne nucleus q Isospin workshop Paris, April 26-29, 2011 Nathal Severijns Kath. University Leuven, Belgium 1/18/2019 N. Severijns, Isospin Workshop - Paris - April 26-29, 2011

N. Severijns, Isospin Workshop - Paris - April 26-29, 2011 1. observable and physics content 2. experimental details 3. results 4. discussion 1/18/2019 N. Severijns, Isospin Workshop - Paris - April 26-29, 2011

1. observable and physics content J  J  + transitions (F component forbidden by isospin selection rule) 1/18/2019 N. Severijns, Isospin Workshop - Paris - April 26-29, 2011

N. Severijns, Isospin Workshop - Paris - April 26-29, 2011 1/18/2019 N. Severijns, Isospin Workshop - Paris - April 26-29, 2011

N. Severijns, Isospin Workshop - Paris - April 26-29, 2011  p  emission asymmetry parameter : 1/18/2019 N. Severijns, Isospin Workshop - Paris - April 26-29, 2011

N. Severijns, Isospin Workshop - Paris - April 26-29, 2011 sensitivity 1/18/2019 N. Severijns, Isospin Workshop - Paris - April 26-29, 2011

2. Experimental details Low Temperature Nuclear Orientation principle : HPGe HPGe Si p-i-n angular distribution : D. Venos et al., NIM A 454 (2000) 403 D. Zákoucký, et al., NIM A 520 (2004) 80 F. Wauters et al., NIM A 604 (2009) 563

N. Severijns, Isospin Workshop - Paris - April 26-29, 2011 52Mn - P. Schuurmans et al., Nucl. Phys. A 622 (2000) 89 71As - N. Severijns et al., Phys. Rev. C 71 (2005) 064310 59Cu, 104mAg - V. Golovko, Ph.D. thesis, K.U.Leuven 1/18/2019 N. Severijns, Isospin Workshop - Paris - April 26-29, 2011

52Mn and 71As beta asymmetry parameter measurements used GEANT4 code to account for: - detection geometry - magnetic field effects - scattering Si p-i-n diode (500 m,  = 9 mm) operating at 10 K Leuven 3He - 4He dilution refrigerator setup 1/18/2019 N. Severijns, Isospin Workshop - Paris - April 26-29, 2011

59Cu and 104mAg beta asymmetry parameter measurements HPGe NICOLE - ISOLDE on-line 3He - 4He dilution refrigerator setup N. Severijns, 2-5 April 2007, ECT*

N. Severijns, Isospin Workshop - Paris - April 26-29, 2011 59Cu  spectra 104mAg 1/18/2019 N. Severijns, Isospin Workshop - Paris - April 26-29, 2011

N. Severijns, Isospin Workshop - Paris - April 26-29, 2011  anisotropy - 1 71As 1/18/2019 N. Severijns, Isospin Workshop - Paris - April 26-29, 2011

N. Severijns, Isospin Workshop - Paris - April 26-29, 2011  anisotropy - 2 71As 676 - 722 keV 1/18/2019 N. Severijns, Isospin Workshop - Paris - April 26-29, 2011

N. Severijns, Isospin Workshop - Paris - April 26-29, 2011  anisotropy - 3 104mAg 1200-1400 keV 1/18/2019 N. Severijns, Isospin Workshop - Paris - April 26-29, 2011

N. Severijns, Isospin Workshop - Paris - April 26-29, 2011 3. Results G. Colò, M. A. Nagarajan, P. Van Isacker, and A. Vitturi, Phys. Rev. C 52, 1175(R) (1995) admixture of all states with isospin T0+1 into state with isospin T0 : with (E0 – EM) = energy of isovector giant monopole resonance V1  25 MeV = proton-neutron exchange potential E0 = excitation energy of state with isospin T0 1/18/2019 N. Severijns, Isospin Workshop - Paris - April 26-29, 2011

N. Severijns, Isospin Workshop - Paris - April 26-29, 2011 1/18/2019 N. Severijns, Isospin Workshop - Paris - April 26-29, 2011

N. Severijns, Isospin workshop - Paris - April 26-29, 2011 Conclusions isospin mixing amplitude from analog state was determined for four J  J transitions with isospin T ranging from 1/2 to 5 isospin impurities ranging from about 0.1% to 1% were observed comparison with calculations for total isospin impurity show the analog state contributes about 2% to 10% of the total impurity no calculations for the isospin impurity from the analog state alone are available 1/18/2019 N. Severijns, Isospin workshop - Paris - April 26-29, 2011

N. Severijns, Isospin Workshop - Paris - April 26-29, 2011 1/18/2019 N. Severijns, Isospin Workshop - Paris - April 26-29, 2011

N. Severijns, Isospin Workshop - Paris - April 26-29, 2011 + decays based on: S. Raman et al., Atom. Data and Nucl. Data Tabl. 16 (1975) 451 1/18/2019 N. Severijns, Isospin Workshop - Paris - April 26-29, 2011

N. Severijns, Isospin Workshop - Paris - April 26-29, 2011 - decays based on: S. Raman et al., Atom. Data and Nucl. Data Tabl. 16 (1975) 451 1/18/2019 N. Severijns, Isospin Workshop - Paris - April 26-29, 2011

N. Severijns, Isospin Workshop - Paris - April 26-29, 2011 distribution in - electron and neutrino directions and in - electron energy from polarized nuclei : Correlation measurements I   Fermi function phase space e+ ne nucleus q - correlation Fierz interference term ( b  0 in standard model ) -asymmetry R-correlation J,D, Jackson, S.B. Treiman, H.W. Wyld, Nucl. Phys. 4 (1957) 206 1/18/2019 N. Severijns, Isospin Workshop - Paris - April 26-29, 2011

Geant 4 Aexp (60Co) = - 1.014 (12)stat (16)syst region analysed  Geant 4 (P from anisotropy of -rays ) Analysis of measured and simulated spectra: performance of GEANT simulation code -- F. Wauters, NS et al., submitted to NIM A Aexp (60Co) = - 1.014 (12)stat (16)syst ( ASM = -0.987(9) ) no energy dependence left  corrections OK F. Wauters et al., submitted 1/18/2019 N. Severijns, Isospin Workshop - Paris - April 26-29, 2011

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