Deformation in 43,44S L. Gaudefroy, R. Chevrier CEA-DAM-DIF, France

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Presentation transcript:

Deformation in 43,44S L. Gaudefroy, R. Chevrier CEA-DAM-DIF, France Strasbourg - Oct. 2012

Exp. studies around N=28: onset of deformation L. Gaudefroy et al., PRL 97, 092501 (2006). B. Bastin et al., PRL 99, 022503 (2007). C. Force et al., PRL 105, 102501 (2010). Strasbourg - Oct. 2012

A focus on Sulfur isotopes g-factor of the 7/2- isomer. => Prolate/Spherical Shape Coex. 43S 320 keV 415 ns 7/2- 3/2- F. Sarazin et al., PRL 84, 5062 (2000). L. Gaudefroy et al., PRL 102, 092501 (2009). R. Chevrier et al., PRL 108, 162501 (2012). Strasbourg - Oct. 2012

A focus on Sulfur isotopes Qexp = 23(3) e.fm2 QSM = 25 e.fm2 Qsp = 4 e.fm2 F. Sarazin et al., PRL 84, 5062 (2000). L. Gaudefroy et al., PRL 102, 092501 (2009). R. Chevrier et al., PRL 108, 162501 (2012). Prolate/weakly deformed shape coexistence. Strasbourg - Oct. 2012

A focus on Sulfur isotopes C. Force et al., PRL 105, 102501 (2010). D. Santiago-Gonzalez et al, PRC 83, 061305 (R) (2011). L. Caceres et al., PRC 85, 024311 (2012). => Prolate/Spherical Shape Coex. Strasbourg - Oct. 2012

A focus on Sulfur isotopes Important triaxial degree of freedom. => Trigger for the present study. T.R. Rodriguez and J.L. Egido, PRC 84, 051307(R) (2011) Strasbourg - Oct. 2012

E. Caurier and F. Nowacki, Act. Pol. B 30, 705 (1999). Present study Onset of collectivity: Protons : πd3/2- πs1/2 Neutrons : νf7/2 - νp3/2 Structure of 42,44,46S and 43S - ANTOINE code E. Caurier and F. Nowacki, Act. Pol. B 30, 705 (1999). - SDPF-U interaction F. Nowacki and A. Poves, PRC 79, 014310 (2009). Look for triaxial degree of freedom in even S. Study the overlap with 43S. Strasbourg - Oct. 2012

π p-h ν p-h 43S 1 2 3 f5/2 f7/2 p3/2 p1/2 d3/2 d5/2 s1/2 1 2 3 f5/2 f7/2 p3/2 p1/2 d3/2 d5/2 s1/2 Strasbourg - Oct. 2012

43S Intrinsic WF GS band (f7/2)-1 config. for 7/21- Evolution of WF above 7/21- Correl. (GS) = 16 MeV Correl. (Isom) = 13 MeV Intrinsic WF GS band (f7/2)-1 config. for 7/21- Evolution of WF above 7/21- Correl. (GS) = 16 MeV Correl. (Isom) = 13 MeV Intrinsic WF GS band (f7/2)-1 config. for 7/21- Evolution of WF above 7/21- Correl. (GS) = 16 MeV Correl. (Isom) = 13 MeV Intrinsic WF GS band (f7/2)-1 config. for 7/21- Evolution of WF above 7/21- Correl. (GS) = 16 MeV Correl. (Isom) = 13 MeV Intrinsic WF GS band (f7/2)-1 config. for 7/21- Evolution of WF above 7/21- Correl. (GS) = 16 MeV Correl. (Isom) = 13 MeV Qs = 25 => β=0,25 Strasbourg - Oct. 2012

44S -> 43S 43S f7/2 f7/2 p3/2 f7/2 p3/2 44S(4+1) -> 43S(7/2-1) : SF=0,65 53% of the strength. Strasbourg - Oct. 2012

44S -> 43S K=4 band. Decay of the 4+ state K-forbiden=>isomer (150ps) D. Santiago-Gonzalez et al, PRC 83, 061305 (R) (2011). 3+ state with same structure=> not K=4 J=4 J=3 J=5 Strasbourg - Oct. 2012

44S -> 43S K=4 band. Decay of the 4+ state K-forbiden=>isomer (150ps) D. Santiago-Gonzalez et al, PRC 83, 061305 (R) (2011). 3+ state with same structure=> not K=4 Strasbourg - Oct. 2012

44S -> 43S K=4 band. Decay of the 4+ state K-forbiden=>isomer (150ps) D. Santiago-Gonzalez et al, PRC 83, 061305 (R) (2011). 3+ state with same structure=> not K=4 1p1h neutron excitation coupled to proton collect. Electromagnetic decay toward structure built on 2+3 state. Strasbourg - Oct. 2012

44S -> 43S (ν) Quasi SU3 sym. => not triaxial (π) Pseudo SU3 sym. => not triaxial A.P. Zuker et al, PRC 52, 1741 (R) (1995). Qs(2+1) = -16 e.fm2 Qs(2+3) = -4 e.fm2 Qs(3+2) = -2 e.fm2 Overlap with quasi SU3 WFs: 65% Strasbourg - Oct. 2012

44S -> 43S Qs(2+1) = 12 e.fm2 Qs(2+3) = -14 e.fm2 Qs(3+2) = 8 e.fm2 d5/2 s1/2 d3/2 Strasbourg - Oct. 2012

44S  43S Complete SU3 2+1 = 0.64 |2+1> + 0.54 |2+2> + … 2+1 = 0.64 |2+1> + 0.54 |2+2> + … 2+2 = 0.47 |2+1> + 0.54 |2+2> + 0.37 |2+3> + … 3+1 = 0.70 |3+1> + 0.39 |3+2> + … 3+2 = 0.38 |3+1> + 0.63 |3+2> + … 4+1 = 0.73 |4+1> + 0.30 |4+2> + … 4+2 = 0.52 |4+1> + 0.52 |4+2> + … Strasbourg - Oct. 2012

44S - 43S 44S Relatively large mixing in the WF. Non negligible overlap with (triaxial?) SU3 states. (3,4,5,6) structure built on 1p1h neutron excitation coupled to (triaxial?) deformed structure. 43S Prolate GS rotationnal band. 7/2 isomer not spherical. Similarities between 7/2 isomer structure and (3,4,5,6) states in 44S. Strasbourg - Oct. 2012