Spectroscopy of the ($alpha$, 2$alpha$) reaction at E/sub $alpha$/ = 90 MeV

Journal Article · Thu Jan 01 04:00:00 EST 1976 · Phys. Rev., C, v. 13, no. 1, pp. 20-34

OSTI ID:4064485

Sherman, J D; Hendrie, D L; Zisman, M S

Nine target nuclei $sup 12$C, $sup 16$O, $sup 24$$,$$sup 26$Mg, $sup 28$$,$$sup 30$Si, $sup 40$$,$$sup 44$Ca, and $sup 66$Zn have been studied by the ($alpha$ ,2$alpha$) reaction at an incident beam energy of 90 MeV. Energy resolution of 250--300 keV full width at half-maximum permitted identification of many excited states, although transitions to the ground state consistently dominated the spectra. The ground state angular correlations for equal outgoing energies and angles were similar in shape over this mass region although the magnitude decreased by a factor of 10 from $sup 12$C to $sup 66$Zn. A phenomenological distorted wave impulse approximation calculation successfully describes most of the angular and energy correlations. A conspicuous failure of the calculation occurs in the energy correlation predictions for recoil momenta greater than 0.6 fm$sup -1$. Spectroscopic results are compared with those from $alpha$ pickup reactions. It is seen that both reactions give nearly the same $alpha$ clustering mass dependence. Plane wave impulse approximation analysis suggests that the principal parent of $sup 16$O in an $alpha$ particle model is the $sup 12$C ground state rather than the first excited state as found in the $alpha$ pickup reactions. (AIP)

• Research Organization: University of California, Lawrence Berkeley Laboratory, Berkeley, California 94720
• NSA Number: NSA-33-027631
• OSTI ID: 4064485
• Journal Information: Phys. Rev., C, v. 13, no. 1, pp. 20-34, Journal Name: Phys. Rev., C, v. 13, no. 1, pp. 20-34; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

*ALPHA REACTIONS-- KNOCK-OUT REACTIONS
642205*
ALPHA PARTICLES
ANGULAR CORRELATION
ARGON 36-- ARGON 40-- BERYLLIUM 8-- CARBON 12-- ENERGY LEVELS-- MAGNESIUM 24-- MAGNESIUM 26-- NEON 20-- NEON 22-- NICKEL 62-- SPECTROSCOPIC FACTORS
ARGON 36-- CALCIUM 40-- CALCIUM 40 TARGET
ARGON 40-- CALCIUM 44-- CALCIUM 44 TARGET
BERYLLIUM 8-- CARBON 12-- CARBON 12 TARGET
CLUSTER MODEL
CROSS SECTIONS
DISTORTED WAVE THEORY
DWBA
IMPULSE APPROXIMATION
MAGNESIUM 24-- MAGNESIUM 24 TARGET-- NEON 20
MAGNESIUM 24-- SILICON 28-- SILICON 28 TARGET
MAGNESIUM 26- - SILICON 30-- SILICON 30 TARGET
MAGNESIUM 26-- MAGNESIUM 26 TARGET-- NEON 22
MEV RANGE 10-100
N68351 --Physics (Nuclear
Experimental)--Nuclear Properties & Reactions
6 <= A <= 19--Nuclear Reactions & Scattering
N68451* --Physics (Nuclear
Experimental)--Nuclear Properties & Reactions
20 <= A <= 38--Nuclear Reactions & Scattering
N68551 --Physics (Nuclear
Experimental)--Nuclear Properties & Reactions
39 <= A <= 58--Nuclear Reactions & Scattering
N68651 --Physics (Nuclear
Experimental)--Nuclear Properties & Reactions
59 <= A <= 89--Nuclear Reactions & Scattering
NICKE