35 Ca decay beta-delayed 1- and 2-proton spokespersons: J. Giovinazzo (CENBG), O. Tengblab (CSIC) institutions: Centre d’Etudes Nucléaires (Bordeaux) –

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Presentation transcript:

35 Ca decay beta-delayed 1- and 2-proton spokespersons: J. Giovinazzo (CENBG), O. Tengblab (CSIC) institutions: Centre d’Etudes Nucléaires (Bordeaux) – CNRS / univ. Bordeaux – France Istituto de Estructura de la Materia (Madrid) – CSIC – Spain Dep. of Physics and Astronomy (Aarhus) – univ. Aarhus – Denmark PH department CERN (Geneva) – Switzerland beta delayed proton(s) emission program 31 Ar studied at ISOLDE previous decay studies Berkeley, J. Aystö et al. (1985) GANIL, W. Trinder et al. (1999)

Previous experiments 1985 Berkeley, J. Aystö et al., PRL 55 (1985) Ca( 3 He,  4n) reaction, helium-jet technique small angle proton-proton coincidences with  E-E silicon telescope - only  -2p measurement (sequential) - first decay scheme 1999 GANIL, W. Trinder et al., PLB 459 (1999) Ca fragmentation, LISE implantation / decay experiment gamma: 3 Ge (70%) and 2 NaI detectors - 19  -p(  ) transitions  B(GT) (weaker quenching than sd shell) - no  -  - no  -2p to excited state in 33 Cl logft(IAS) = 3.09 T 1/2 = 50 ± 30 ms  m = 4463 ± 60 keV (IMME) logft(IAS) = 4.1  missed strength ? T 1/2 = 25.7 ± 0.2 ms  m = 4530 ± 66 keV (IMME)

31 Ar and 35 Ca at ISOLDE current proposal is continuation of  -p and  -2p decay studies at ISOLDE 31 Ar experiment : Phys. Rev. C 87, (2013) G. T. Koldste, H.O.U. Fynbo, et al. mainly study of 30 S resonances (  -p)  nucleosynthesis   -p(  ) and  -2p  new experimental method for  p /  estimate

Q EC 0 T = 5/2 IAS 35 Ca 35 P 34 Ar+p 33 Cl + 2p 1/2 + 3/ /2 + 3/2 + purpose of the experiment (I) rich decay scheme beta-gamma beta-proton(-gamma) beta-2proton(-gamma) decay spectroscopy a unique access to drip-line nuclei

Q EC 0 T = 5/2 IAS 35 Ca 35 P 34 Ar + p 33 Cl + 2p 1/2 + 3/ /2 + 3/2 + purpose of the experiment (II)  / CE   beta-gamma coincidences not observed in previous experiments unexpected low B(F) strength

Q EC 0 T = 5/2 IAS 35 Ca 35 P 34 Ar + p 33 Cl + 2p 1/2 + 3/ /2 + 3/2 + purpose of the experiment (III)  / CE   beta-protonunresolved proton groups (GANIL)  improved resol. B(GT) distribution (including  -  ?) proton emission from IAS is isospin forbiddenT( 35 P IAS ) = 1/2 T( 34 Ar gs ) = ½ proton vs gamma emission  isospin mixing p

Q EC 0 T = 5/2 IAS 35 Ca 35 P 34 Ar + p 33 Cl + 2p 1/2 + 3/ /2 + 3/2 + purpose of the experiment (IV)  / CE   beta-proton-gamma vs beta-2-proton gamma / proton widths in 34 Ar rp-process: 33 Cl(p,  ) 34 Ar reaction p

Q EC 0 T = 5/2 IAS 35 Ca 35 P 34 Ar + p 33 Cl + 2p 1/2 + 3/ /2 + 3/2 + purpose of the experiment (V)  / CE p  beta-2-proton feeding of excited state in 33 Cl ? (seen at Berkeley, not at GANIL) search for a direct 2-proton branch (never evidenced in  2p) p 2p?

Q EC 0 T = 5/2 IAS 35 Ca 35 P 34 Ar+p 33 Cl + 2p 1/2 + 3/ /2 + 3/2 + purpose of the experiment (summary)  beta-gamma and B(F) strength (and B(GT) ? )  beta-2-proton 33 Cl states feeding and direct 2p  gamma / proton widths, rp process  beta-protonhigh resol. spectro. B(GT) distribution  beta-(1-/2-)proton E  (IAS), masses (IMME)  detailed decay scheme 

detection set-up (I): charged particles “Silicon-cube” device 6 DSSSD for protons  high granularity (2p emission angles)  detection efficiency ~60% for 1 proton  energy FWHM ~ 25 keV (low noise P.A.) back-detectors - beta suppression - high-energy protons ions deposited on a thin mylar catcher catcher DSSSD back-plane

detection set-up (II): gamma-rays Germanium detectors 2 Ge-clusters (si-cube originally designed for 3 Ge-clovers) ( 31 Ar experiment with 2 MINIBALL clusters) -high resolution -efficiency ~10-15% (at 1 MeV) close geometry (~8 cm)

beam-time request production with TiC targets (under tests, unknown count rates) measurements:cycles (T 1/2 ) ~ 1 shift (~20% “duty cycle”) continuous production (100%) experiment “duty cycle” ~75 % detection efficiency1 proton ~50 % 2 protons ~25 % daily count rates  p  2p total  2p direct with Ca / s ? beam-time request - Beam and separator tuning3 shifts - Set-up tuning and calibration ( 37,36 Ca…)3 shifts - Experiment ( 35 Ca beam)24 shifts - Total30 shifts

35 Ca decay beta-delayed 1- and 2-proton spokespersons: J. Giovinazzo (CENBG), O. Tengblab (CSIC) institutions: Centre d’Etudes Nucléaires (Bordeaux) – CNRS / univ. Bordeaux – France Istituto de Estructura de la Materia (Madrid) – CSIC – Spain Dep. of Physics and Astronomy (Aarhus) – univ. Aarhus – Denmark PH department CERN (Geneva) – Switzerland thank you for your attention…