Spectroscopy of /sup 16/F from the /sup 16/O(p,n)/sup 16/F reaction at 99 and 135 MeV

Journal Article · Thu Apr 01 04:00:00 EST 1982 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.25.1760· OSTI ID:5229597

Fazely, A; Anderson, B D; Ahmad, M; Baldwin, A R; Kalenda, A M; McCarthy, R J; Watson, J W; Madey, R; Bertozzi, W; Buti, T N; Finn, J M; Kovash, M A; Pugh, B; Foster, C C

We measured neutron energy spectra and extracted angular distributions for eleven separate transitions for the /sup 16/O(p,n)/sup 16/F reaction at 99.1 and 135.2 MeV. Several new spin and parity assignments are obtained for states in /sup 16/F by comparison of the excitation energy spectra with known analog states in /sup 16/O and with a shell-model prediction and by analysis of the neutron angular distributions. The most strongly-excited are two 2/sup -/ states at E/sub x/ = 0.40 +- 0.05 and 7.6 +- 0.1 MeV, a 4/sup -/ states at 6.37 +- 0.05 MeV, and two broad 1/sup -/ states at 9.4 +- 0.1 and 11.5 +- 0.1 MeV. These states are analogs of known 2/sup -/ (M2) states, a 4/sup -/ ''stretched'' state, and 1/sup -/ (E1) strength, respectively, in /sup 16/O. Three weakly-excited 1/sup +/ states are observed at E/sub x/ = 3.75 +- 0.05, 4.65 +- 0.05, and 6.23 +- 0.05 MeV. These states are analogs of known 1/sup +/ (M1) states in /sup 16/O and directly indicate correlations in the ground state of /sup 16/O. A weakly excited 4/sup -/ state is seen at 5.93 +- 0.05 MeV in good agreement with a 4/sup -/ state observed in /sup 16/O (e,e') measurements. All of the most strongly excited states align (to within +- 200 keV) with known T = 1 analog states in /sup 16/O for a common net displacement energy of 12.6 MeV. The (p,n) reaction at medium energies is shown to be an important spectroscopic tool.

• Research Organization: Department of Physics, Kent State University, Kent, Ohio 44242
• OSTI ID: 5229597
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 25:4; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
BARYON REACTIONS
CHARGE-EXCHANGE REACTIONS
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DATA
DISTRIBUTION
ENERGY LEVELS
ENERGY RANGE
ENERGY SPECTRA
EXPERIMENTAL DATA
FLUORINE 16
FLUORINE ISOTOPES
HADRON REACTIONS
INFORMATION
ISOBARIC ANALOGS
ISOTOPES
LIGHT NUCLEI
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 100-1000
NEUTRON SPECTRA
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUMERICAL DATA
OXYGEN 16 TARGET
PARITY
PARTICLE PROPERTIES
PROTON REACTIONS
SHELL MODELS
SPECTRA
SPIN
TARGETS