Spectroscopy of {sup 13}B via the {sup 13}C(t,{sup 3}He) reaction at 115A MeV

Journal Article · Sat Aug 15 04:00:00 EDT 2009 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.80.024305· OSTI ID:21290044

Guess, C J; Zegers, R G. T.; Brown, B A; Deaven, J M; Hitt, G W; Meharchand, R ^[1]; Austin, Sam M; Perdikakis, G; Tur, C ^[1]; Bazin, D; Grinyer, G F ^[1]; Caesar, C; Herlitzius, C ^[1]; Noji, S; Sakai, H ^[2]; Shimbara, Y ^[3]

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1. National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321 (United States)
2. Department of Physics, University of Tokyo, Bunkyo, Tokyo 113-0033 (Japan)
3. Graduate School of Science and Technology, Niigata University, Niigata 950-2181 (Japan)

Gamow-Teller and dipole transitions to final states in {sup 13}B were studied via the {sup 13}C(t,{sup 3}He) reaction at E{sub t}=115A MeV. In addition to the strong Gamow-Teller transition to the {sup 13}B ground state, a weaker Gamow-Teller transition to a state at 3.6 MeV was found. This state was assigned a spin-parity of 3/2{sup -} by comparison with shell-model calculations using the WBP and WBT interactions which were modified to allow for mixing between n({Dirac_h}/2{pi}){omega} and (n+2)({Dirac_h}/2{pi}){omega} configurations. This assignment agrees with a recent result from a lifetime measurement of excited states in {sup 13}B. The shell-model calculations also explained the relatively large spectroscopic strength measured for a low-lying 1/2{sup +} state at 4.83 MeV in {sup 13}B. The cross sections for dipole transitions up to E{sub x}({sup 13}B)=20 MeV excited via the {sup 13}C(t,{sup 3}He) reaction were also compared with the shell-model calculations. The theoretical cross sections exceeded the data by a factor of about 1.8, which might indicate that the dipole excitations are ''quenched''. Uncertainties in the reaction calculations complicate that interpretation.

• OSTI ID: 21290044
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 2 Vol. 80; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BORON 13
CARBON 13 TARGET
COMPARATIVE EVALUATIONS
CROSS SECTIONS
DIPOLES
EXCITATION
EXCITED STATES
GAMOW-TELLER RULES
GROUND STATES
HELIUM 3
INTERACTIONS
LIFETIME
MEV RANGE
PARITY
SHELL MODELS
SPECTROSCOPY
SPIN