Published January 2002
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Evidence for a new low-lying resonance state in 7He
Description
Low-lying resonance states in 7He (6He + n), formed after fragmentation reactions of a 227 MeV/u 8He beam in a carbon target, have been studied. Coincidences between 6He nuclei and neutrons, corresponding to the one-neutron knockout channel in 8He, were selected. The relative energy spectrum in the 6He + n system shows a structure, which is interpreted as the 7He (Iπ = 3/2-) ground state, unbound with 0.43(2) MeV relative to the 6He + n system and a width of Γ = 0.15(8) MeV overlapping with an excited (Iπ = 1/2-) state observed at 1.0(1) MeV with a width of Γ = 0.75(8) MeV. (orig.)
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Additional details
Publishing Information
- Imprint Pagination
- 4 p.
- Report number
- GSI--2002-05(prepr.)
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 33010696
- Subject category
- S73: NUCLEAR PHYSICS AND RADIATION PHYSICS;
- Resource subtype / Literary indicator
- Numerical Data
- Descriptors DEI
- CARBON 12 TARGET; DIFFERENTIAL CROSS SECTIONS; ENERGY SPECTRA; EXCITED STATES; EXPERIMENTAL DATA; GEV RANGE 01-10; GROUND STATES; HELIUM 7; HELIUM 8 REACTIONS; KNOCK-OUT REACTIONS; LEVEL WIDTHS; NEUTRONS; RESONANCE
- Descriptors DEC
- BARYONS; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; CROSS SECTIONS; DATA; DIRECT REACTIONS; ELEMENTARY PARTICLES; ENERGY LEVELS; ENERGY RANGE; EVEN-ODD NUCLEI; FERMIONS; GEV RANGE; HADRONS; HEAVY ION REACTIONS; HELIUM ISOTOPES; INFORMATION; ISOTOPES; LIGHT NUCLEI; NUCLEAR REACTIONS; NUCLEI; NUCLEONS; NUMERICAL DATA; RADIOISOTOPES; SPECTRA; TARGETS