Determination of the Gamow-Teller strength distribution from the odd-odd nucleus {sup 50}V measured through {sup 50}V(d,{sup 2}He){sup 50}Ti and astrophysical implications

Journal Article · Tue Feb 01 04:00:00 EST 2005 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.71.024603· OSTI ID:20695948

Baeumer, C; Frekers, D; Grewe, E -W; Haefner, P; Hollstein, S; Junk, B C; Korff, A; Rakers, S ^[1]; Berg, A.M. van den; Davids, B; Harakeh, M N; Hunyadi, M; Huu, M.A. de; Woertche, H J ^[2]; Frenne, D de; Jacobs, E; Negret, A; Popescu, L ^[3]; Hofmann, F; Neumann-Cosel, P von ^[4]

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1. Institut fuer Kernphysik, Westfaelische Wilhelms-Universitaet Muenster, D-48149 Muenster (Germany)
2. Kernfysisch Versneller Instituut, Rijksuniversiteit Groningen, NL-9747 AA Groningen (Netherlands)
3. Vakgroep Subatomaire en Stralingsfysica, Universiteit Gent, B-9000 Gent (Belgium)
4. Institut fuer Kernphysik, Technische Universitaet Darmstadt, D-64289 Darmstadt (Germany); and others

Cross sections for the charge-exchange reaction (d,{sup 2}He) on {sup 50}V, the only odd-odd stable nucleus in the pf shell, have been measured at an incident energy of 171 MeV. The two correlated protons of the unbound {sup 2}He system were both momentum analyzed and detected by the same spectrometer and detector. Measurements have been carried out at forward center-of-mass angles up to 6 deg. The GT{sup +} strength distribution has been extracted up to about 12 MeV of excitation energy. Because charge-exchange reactions from {sup 50}V provide a unique opportunity to probe Gamow-Teller response from an odd-odd nucleus of the pf shell, the present study serves as important test case for model calculations and astrophysical processes that proceed through GT-type transitions. Consequently, the experimental result is compared with a large-scale shell-model calculation, and the implications for electron-capture processes in presupernova environments are discussed.

• OSTI ID: 20695948
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 2 Vol. 71; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CHARGE-EXCHANGE REACTIONS
CROSS SECTIONS
DEUTERON REACTIONS
DISTRIBUTION
ELECTRON CAPTURE
EXCITATION
GAMOW-TELLER RULES
HELIUM 2
MEV RANGE
PROTONS
SHELL MODELS
TITANIUM 50
VANADIUM 50 TARGET