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Measurement of 58 Co Gamow-Teller Strength via (t, 3 He)

ref: ESA. Measurement of 58 Co Gamow-Teller Strength via (t, 3 He). Arthur L. Cole N ational S uperconducting C yclotron L aboratory, Michigan State University. Independent Particle Model (IPM). Shell Model (SM). f 5/2. f 7/2. neutrons. protons. neutrons. protons.

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Measurement of 58 Co Gamow-Teller Strength via (t, 3 He)

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  1. ref: ESA Measurement of 58Co Gamow-Teller Strength via (t,3He) Arthur L. Cole National Superconducting Cyclotron Laboratory, Michigan State University

  2. Independent Particle Model (IPM) Shell Model (SM) f5/2 f7/2 neutrons protons neutrons protons Motivation: Electron Capture Heger et al. (2001) Core Collapse Supernovae, Pre-collapse Stage: EC influences pressure, entropy, electron fraction (Ye) WW: Woosley, Weaver (FFN) w/ Independent Particle Model LMP: Langanke, Martinez-Pinedo; Heger, Langanke w/ Shell Model Example: 56Ni28+56Co27+ Need Experiment to test and validate model calculations

  3. Study Electron Capture: e- + 58Ni  58Co + via Charge-Exchange : t+ 58Ni  58Co + 3He Linearity (3He,t) Fujiwara et al. (1996) Gamow-Teller Strength, B(GT) Gamow-Teller: ∆L = 0, ∆S = 1, ∆T = 1

  4. Study EC:e- + 58Ni  58Co + 58Ni(e, )58Co via (n,p), (d,2He),(t,3He) FWHM ~ 250 keV Charge-Exchange Reactions Ebeam > 100 MeV/nucleon Linearity Resolution • n+ 58Ni  58Co + p 58Ni(n, p)58Co • resolution ≥ 1 MeV, Good linearity (p,n), well studied • d+ 58Ni  58Co + 2He58Ni(d, 2He)58Co • resolution ≥ 100-160 keV, Complex reaction mechanism • t + 58Ni  58Co + 3He 58Ni(t, 3He)58Co • resolution ≥ 160-200 keV, Good linearity

  5. Detectors p n p n n p Gamow-Teller 3He Spin-flip, S=1 D2 S800 Spectrometer t D1 Target t  beam  t ~112 MeV/nucleon 58Ni: 7.61 mg/cm2 CH2: 6.72 mg/cm2 The Experiment t + 58Ni  58Co + 3He 58Ni(t, 3He)58Co

  6. FWHM ~ 250 keV Gamow-Teller? 58Ni(t, 3He)58Co at 112 Mev/nucleon

  7. FWHM ~ 250 keV Multipole Decomposition Analysis Ex(58Co) 1.75-2 MeV MDA w/ Distorted Wave Born Approximation

  8. 58Ni(t,3He)58Co at NSCL • 58Ni(n,p)58Co at TRIUMF • 58Ni(d,2He)58Co at KVI • Large-scale SM (KB3G) • 1-MeV rebinned Gamow-Teller Strength, B(GT) • 58Ni(t,3He)58Co Data more • like 58Ni(d,2He)58Co • Need Experiment to Test • and Validate Models

  9. Collaboration A.L. Cole, R.G.T. Zegers, S.M. Austin, D. Bazin, G.W. Hitt, B.M. Sherrill, M. Steiner, National Superconducting Cyclotron Laboratory,H. Akimune,Konan University, A.M. Van Den Berg, G.P.A. Berg, M.N. Harakeh, Kernfysisch Versneller Instituut,Y. Fujita, H. Ueno, Osaka University,M. E. Howard, The Ohio State University, Daito, M. Fujiwara, K. Hara,Research Center for Nuclear Physics, Osaka University,T. Kawabata,RIKEN, T. Nakamura,Toyko Institute of Technology,J. Jänecke, University of Michigan,J. Brown,Wabash College

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