Elsevier

Nuclear Physics A

Volume 108, Issue 2, 5 February 1968, Pages 289-315
Nuclear Physics A

Energy level structure of 9Be and 9B

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Abstract

The mirror nuclei 9Be and 9B were investigated using various reactions. Using the 7Li (3He, p)9Be reaction, excitation energies and (widths) of 2429.2±1.7(<8) keV, 3076±15(289±22) keV and 4704±25(743±55) keV were measured. Values of 2431.9±7.0 keV and 3040±15(294±20) keV were found using the 9Be(d, d′)9Be reaction. Using the 10B(3He, α)9B reaction, excitation energies and (widths) of 2361±5(81±5) keV and 2788±30(548±40) keV were measured. Part of the spectrum from this reaction could be interpreted as a level in 9B near 1.5 MeV with a width of about 0.7 MeV but the evidence is inconclusive. Upper limits are imposed on the intensity of any narrow levels in 9Be between 3 and 6 MeV in excitation and in 9B between 4 and 7 MeV in excitation. No indication was found that the 2.43 or 3.06 MeV states in 9Be are composed of more than one level. The experimentally determined energy level structure of 9Be is compared with theoretical predictions based on various nuclear models. In addition, a two-parameter analysis was made of the 10B + 3Hep + α + 8Be (g.s.) reaction by observing with solid-state detectors, the proton and alpha particle in coincidence. No evidence was found for an excited state in 9B, between 3.5 and 9.5 MeV, which decays via a proton to the ground state of 8Be; however, three excited states in 12C, at 9.6, 10.8 and 14.1 MeV were found to decay via an alpha particle to the ground state of 8Be.

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    ††

    This work was supported in part by the U.S. Office of Naval Research under Contract Nonr-1623(05) and is based in part upon portions of a thesis submitted by J.J. Kroepfl to the Graduate School of the University of Notre Dame in partial fulfillment of the requirements for the degree of Doctor of Philosophy.

    Present address: Northwest Campus, Indiana University, Gary, Indiana.

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