Observation of narrow states in nuclei beyond the proton drip line: {sup 15}F and {sup 16}Ne

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

DOI:https://doi.org/10.1103/PHYSREVC.79.061301· OSTI ID:21293740

Mukha, I ^[1]; Timofeyuk, N K ^[2]; Suemmerer, K; Chatillon, A; Geissel, H; Hofmann, J; Kurz, N; Nociforo, C; Ott, W; Roeckl, E; Weick, H ^[3]; Acosta, L; Garcia-Ramos, J E; Martel, I ^[4]; Alvarez, M A. G.; Espino, J M; Gomez-Camacho, J ^[1]; Casarejos, E; Cortina-Gil, D; Rodriguez-Tajes, C ^[5]

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1. Universidad de Sevilla, E-41012 Seville (Spain)
2. Department of Physics, School of Electronics Physical Sciences, University of Surrey, Guildford, GU2 7XH (United Kingdom)
3. GSI Helmholtzzentrum fuer Schwerionenforschung, D-64291 Darmstadt (Germany)
4. Universidad de Huelva, E-21071 Huelva (Spain)
5. Universidade de Santiago de Compostela, E-15782 Santiago de Compostela (Spain)

Two high-lying states in {sup 15}F and {sup 16}Ne, unbound with respect to one-proton (1p) and two-proton (2p) emissions, have been observed in the fragmentation of {sup 17}Ne at intermediate energies. They undergo mainly sequential emissions of protons via intermediate states in {sup 14}O and {sup 15}F and have decay energies of 7.8(2) and 7.6(2) MeV, respectively. The widths of the newly observed states in {sup 15}F and {sup 16}Ne are much smaller than the Wigner limits for single-particle configurations, of 0.4(4) and 0.8({sub +8}{sup -4}) MeV, respectively. In addition, narrow widths of 0.2(2) MeV are derived for two other high-lying states in {sup 15}F with Q{sub p} of 4.9 and 6.4 MeV, which match features of the recently predicted narrow odd-parity {sup 15}F states with two valence protons in the sd shell. All energies and widths have been obtained by analyzing angular correlations of the decay products, p-p-{sup 14}O and p-p-{sup 13}N, whose trajectories have been measured by a tracking technique with silicon microstrip detectors.

• OSTI ID: 21293740
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 6 Vol. 79; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR CORRELATION
CONFIGURATION
DAUGHTER PRODUCTS
EMISSION
FLUORINE 15
FRAGMENTATION
INTERMEDIATE STATE
MEV RANGE 01-10
NEON 16
NEON 17
NITROGEN 13
OXYGEN 14
PARITY
PROTON-EMISSION DECAY
PROTONS
SI MICROSTRIP DETECTORS
WIGNER THEORY