DSAM lifetime measurements at ReA - from stable Sn to exotic Ca. Hiro IWASAKI (NSCL/MSU)
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1 DSAM lifetime measurements at ReA - from stable to exotic Ca Hiro IWASAKI (NSCL/MSU) 8/20/2015 ReA3 upgrade workshop 1
2 Evolution of halo properties N=28 pf-shell N>40 gds-shell E0,E? Efimov? 62 Ca? N=8 p-shell parity inversion 11 Li, 11 Be 8/20/2015 new magic N=16 19 C, 22 C deformation? N=20 sd-shell island of inversion Large E1 s1/2-wave 31 Ne, 37 Mg Large E2? p-wave T.Nakamura et al., PRL112(14) N.Kobayashi et al., PRL112(14) G.Hagen et al., PRL111(13)132501
3 Transition rates (level lifetimes) and halo properties 1) Large B(E1) evidence for halo / skin 11 Be (1/2 + 1/2 - ) : 0.1 e 2 fm 2, 0.36 W.u. 68 Ni PDR : 1.2e 2 fm 2, 1W.u. (5% of EWSR) O.Wieland et al., PRL102(09) /20/2015 1) cf. Soft Scissors Mode: P. Van Isacker, Heavy Ion Physics 6 (1997) 45 3
4 From GRETINA 1 st Campaign with fast RI beams Recoil-distance method for 17,19 C with TRIPLEX plunger One of the most hindered M1 strengths found for one neutron halo nucleus 19 C 19 C 17 C t=528(21)ps for 1/2 + 22(3)ps for 5/ C : D.Smalley, H.Iwasaki, P.Navratil, R.Roth et al., effects of 3NF, continuum in NCSM(C), submitted A comparison with shell model calculations suggests the s-wave prevalence in both the ground (1/2 + ) and excited (3/2 + ) states in 19 C, characteristic of halo structure, causes a diminished magnetic response. 19 C : K.Whitmore, D.Smalley, H.Iwasaki et al., Phys.Rev.C91(2015)041303(R) 8/20/2015 ReA3 upgrade workshop 4
5 Evolution of halo properties N=28 pf-shell N>40 gds-shell E0,E? Efimov? 62 Ca? N=8 p-shell parity inversion 11 Li, 11 Be 8/20/2015 new magic N=16 19 C, 22 C deformation? N=20 sd-shell island of inversion Large E1 s1/2-wave 31 Ne, 37 Mg Large E2? p-wave T.Nakamura et al., PRL112(14) N.Kobayashi et al., PRL112(14) G.Hagen et al., PRL111(13)132501
6 Evolution from stable to exotic Ca Lowering of the 3S1/2 state near the dripline? 60 Ca N>40 gds-shell?? 2s1/2 3s1/ s1/2 g9/2 g7/2,d5/2,d3/2,1h11/2 120 A.Ozawa et al.,prl84(00)5493, C.R.Hoffman et al., PRC89(14)061305(R) 8/20/2015 ReA3 upgrade workshop 6
7 Level Schemes in N=69 isotones 17 C, 19 C 117, 119 (Z=50, N=67,69) (Z=6,N=11,13) 115 Cd, 117 Cd (Z=48, N=67,69) (3/2 + ) (1/2 + ) 107 Zr, 109 Zr (Z=40, N=67,69) 1000 kev N= ns B(M1)= 0.015W.u. 2.3ps B(M1)= W.u Cd 115 Pd l-forbidden M1 transitions and pseudospin symmetry, P. von Neumann-Cosel, J.N.Ginocchio, PRC62 (00)
8 Level Schemes in N=67 isotones 17 C, 19 C 117, 119 (Z=50, N=67,69) (Z=6,N=11,13) 115 Cd, 117 Cd (Z=48, N=67,69) (3/2 + ) (1/2 + ) 107 Zr, 109 Zr (Z=40, N=67,69) 1000 kev N=67 1.9ps B(M1)= W.u ns B(M1)=? Cd 113 Pd l-forbidden M1 transitions and pseudospin symmetry, P. von Neumann-Cosel, J.N.Ginocchio, PRC62 (00)
9 Direct reactions (p,d),(d,p) with ReA beams + DSAM Measure recoils (energy, angle) tag reactions, Q value (p,d) Q = -8MeV (ReA9-A12) : (d,p) Q>0MeV (ReA6) Momentum matching selective to specific states (l) AMeV 50um 20um CH2 Ta Target stopper H 10MeV 1 H 4MeV 116 5AMeV 50um 20um CD2 Ta Target stopper 117 8/20/2015 ReA3 upgrade workshop 9
10 DSAM with GRETINA at ReA in inverse kinematics to measure sub-ps lifetimes of exotic nuclei 100 fs 118 (p,d) at 10AMeV um 20um CH2 Ta Target stopper 1000keV 200keV 117 8/20/2015 ReA3 upgrade workshop 10
11 Opportunities for ReA6/ReA9/ReA counts in one experiment beam 1 mb (or 10 4 beam 10mb) GRETINA GRETA Physics opportunities : l-forbidden M1 measurement (pseudospin partners) E2 transitions (for higher-lying states, symmetries) Collective M1, E3 transitions 8/20/2015 ReA3 upgrade workshop 11
12 Summary Spectroscopy and lifetime measurements at ReA6/ReA9/Re12 (above Coulomb barrier) are discussed. The behavior of the 3s orbital is discussed as a key observable to investigate the shell evolution from stable to exotic Ca. As a possible probe, sub-ps lifetime measurements based on DSAM technique with ReA beams are proposed to study the l-forbidden M1 transitions. Similar experimental approaches can be used in various spectroscopic studies on low-lying structure of exotic nuclei. 8/20/2015 ReA3 upgrade workshop 12
13 Thank you, and 8/20/2015 ReA3 upgrade workshop 13
14 Whitepaper for ReA3 upgrade This workshop will be the kickoff for a whitepaper outlining the science opportunities at the ReA facility. All speakers and those who are interested are invited to send a 1-page document describing their science interests. Schedule: August 20 August 31 ReA3 upgrade workshop organizer(s) will contact with you September 30 deadline for the 1-page draft November 30 January, 2016 first draft for whitepaper final version Presentation slides and any updates for whitepaper preparation, ReA project, etc will be posted at 8/20/2015 ReA3 upgrade workshop 14
15 Outline of the whitepaper (tentative) Introduction and Executive Summary Physics Opportunities at ReA discussed today in workshop - Structure of exotic nuclei shell and shape evolution, collective phenomena, high-spin states, nuclear clustering, weakly-bound system - Reaction dynamics at and above Coulomb barrier fusion, direct reactions, multi-fragmentation, isospin equilibration (EOS) - Heavy and super-heavy element studies multi-nucleon transfer reactions, chemical studies of neutron-rich SHEs - Nuclear astrophysics transfer reactions, ANC, - other applications particle emission of compound nuclei, photon strength function, ReA6/ReA9/ReA12 facility - conceptual design - possible ideas for major equipment - cost estimates and time lines for the ReA and associated infrastructure 8/20/2015 ReA3 upgrade workshop 15
16 Thank you 8/20/2015 ReA3 upgrade workshop 16
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