Investigation of particle-unbound excited states in light nuclei with resonance-decay spectroscopy using a {sup 12}Be beam

Journal Article · Sat Nov 15 04:00:00 EST 2008 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.78.054307· OSTI ID:21199356

Charity, R J; Komarov, S A; Sobotka, L G; Clifford, J; Bazin, D; Gade, A; Lee, Jenny; Lukyanov, S M; Lynch, W G; Mocko, M; Lobastov, S P; Rogers, A M; Sanetullaev, A; Tsang, M B; Wallace, M S; Zegers, R G. T.; Hudan, S; Metelko, C; Famiano, M A; Wuosmaa, A H ^[1]

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1. Departments of Chemistry and Physics, Washington University, St. Louis, Missouri 63130 (United States)

Resonance-decay spectroscopy is used to study particle-unbound excited states produced in interactions of E/A=50 MeV {sup 12}Be on polyethylene and carbon targets. The particle-unbound states are produced in a variety of reaction mechanisms, ranging from projectile fragmentation to proton pickup. New proton-decaying excited states are observed in {sup 9}Li(E*=14.1{+-}0.1 MeV, {gamma}=207{+-}49 keV) and {sup 10}Be(E*=20.4{+-}0.1 MeV, {gamma}=182{+-}74 keV). In addition a new {alpha}-decaying state is observed in {sup 13}B(E*=13.6{+-}0.1 MeV, {gamma}{<=}320 keV). Also found was a {sup 8}Be state with E*=23 MeV, {gamma}=616{+-}30 keV, which decays to the p+{sup 3}H+{alpha} channel. Correlation between the fragments indicates that the decay is initiated by a proton emission to the 4.63-MeV state of {sup 7}Li and the spin of the state is J>2. A second T=2 state was confirmed in {sup 12}B at 14.82 MeV, which decays to the p+{sup 11}Be, {sup 3}H+{sup 9}Be, and {alpha}+{sup 8}Li channels. Its width was found to be {gamma}{<=}100 keV and its spin is consistent with J{sup {pi}}=2{sup +}.

• OSTI ID: 21199356
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 5 Vol. 78; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BERYLLIUM 10
BERYLLIUM 11
BERYLLIUM 12
BERYLLIUM 8
BERYLLIUM 9
BORON 12
BORON 13
CORRELATIONS
DECAY
ELECTRONS
EXCITED STATES
FRAGMENTATION
KEV RANGE
LITHIUM 7
LITHIUM 8
LITHIUM 9
MEV RANGE
PROTONS
REACTION KINETICS
TRITIUM