The first excited state of He{sup 5}

Conference · Mon Apr 01 04:00:00 EST 1963

OSTI ID:4661172

Fessenden, Peter; Maxson, D. R.

The reaction Li/sup 7/(d, α)He{sup 5} was studied using coincidence circuitry and solid state charged particle detectors. Targets of natural and isotopic Li were bombarded with 150 - 200 keV deuterons, and α-particles emitted at laboratory angles of 90 degrees ond 82 degrees were detected in coincidence. The (d, α) reaction proceeding to the ground state of He{sup 5} was observed. Its differential cross section at 90 degrees was measured relative to that for Li{sup 6}(d, α) alpha) α, and a value of 2.4 was assigned to the parameter A in the function f(theta) = 1 + Asin/sup 2/ theta that describes the center of mass α-particle distribution resulting from the disintegration of He{sup 5}. The first excited state of He{sup 5} was found to have an excitation energy of 2.6 +- 0.4 Mev. The intensity of the excited state alpha group was greater than that of the ground state group by a factor of about 1.5. There was no evidence for any other excited state up to at least 7 Mev. The ratio of the differential cross sections at 90 degrees for Li{sup 6}/(d,p)Li{sup 7} and Li{sup 6}/(d, α) α was determined for deuteron energies and found to agree with reported cross section data. 30 references. (auth)

• Research Organization: Brown Univ., Providence, RI (United States)
• Sponsoring Organization: US Atomic Energy Commission (AEC)
• NSA Number: NSA-17-036648
• OSTI ID: 4661172
• Report Number(s): CONF-46--93; AED-Conf--63-048-106
• Country of Publication: United States
• Language: English

Related Subjects

ALPHA PARTICLES
ANGULAR DISTRIBUTION
BIBLIOGRAPHY
CHARGED PARTICLES
COINCIDENCE METHODS
CROSS SECTIONS
DECAY
DEUTERON BEAMS
EMISSION
ENERGY
ENERGY LEVELS
ENERGY RANGE
EXCITATION
HELIUM 5
ISOTOPES
LITHIUM 6
LITHIUM 7
MEASURED VALUES
NUCLEAR REACTIONS
PHYSICS
PROTONS
RADIATION DETECTORS
SEMICONDUCTORS
TARGETS
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