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

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Presentation transcript:

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

Motivation: Electron Capture WW: Woosley, Weaver (FFN) w/ Independent Particle Model LMP: Langanke, Martinez-Pinedo; Heger, Langanke w/ Shell Model Independent Particle Model (IPM) Shell Model (SM) protons neutrons f 7/2 f 5/2 protons neutrons Need Experiment to test and validate model calculations Example: 56 Ni 28+  56 Co 27+ Heger et al. (2001) Core Collapse Supernovae, Pre-collapse Stage: EC influences pressure, entropy, electron fraction (Y e )

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

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

The Experiment t + 58 Ni  58 Co + 3 He  58 Ni(t, 3 He) 58 Co Target  beam  t ~112 MeV/nucleon 3 He t t np n n p p 58 Ni: 7.61 mg/cm 2 CH 2 : 6.72 mg/cm 2 D2D2 D1D1 Detectors S800 Spectrometer Gamow-Teller Spin-flip,  S=1

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

Multipole Decomposition Analysis MDA w/ Distorted Wave Born Approximation E x ( 58 Co) MeV FWHM ~ 250 keV

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

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