The missing 1 2+ mirror state in 9B

W. N. Catford; L. K. Fifield; E. L. Reber; K. W. Kemper; J. D. Brown

doi:10.1016/0375-9474(92)90021-B

The missing 1 2⁺ mirror state in ⁹B

W. N. Catford, L. K. Fifield, E. L. Reber, K. W. Kemper, J. D. Brown

Nuclear Science & Technology

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Abstract

The status of the mirror state in ⁹B of the first excited 1 2⁺ 1.68 MeV state in ⁹Be is reviewed. The experimental evidence is inconclusive except for an apparent peak recently reported in a spectrum from the ⁹Be(⁶Li, ⁶He)⁹B reaction. This reaction has been reinvestigated at the same energy and angle but with substantially improved resolution and statistics, and the present results provide no evidence for the previously reported peak. Spectra obtained at other energies and angles have very low background and yet similarly fail to exhibit a peak. In addition, no evidence for population of the mirror state is found in spectra taken for the reaction ¹⁰B(⁹Be, ¹⁰Be)⁹B at two bombarding energies. The energy and width of the expected 1 2⁺ state in ⁹B remain open questions for which several different theoretical descriptions offer quite different predictions.

Original language	English
Pages (from-to)	517-526
Number of pages	10
Journal	Nuclear Physics A
Volume	550
Issue number	3
DOIs	https://doi.org/10.1016/0375-9474(92)90021-B
State	Published - Dec 14 1992

Keywords

Nuclear reactions

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10.1016/0375-9474(92)90021-B

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@article{97e742d0dbb847429b5841ecec4327b0,

title = "The missing 1 2+ mirror state in 9B",

abstract = "The status of the mirror state in 9B of the first excited 1 2+ 1.68 MeV state in 9Be is reviewed. The experimental evidence is inconclusive except for an apparent peak recently reported in a spectrum from the 9Be(6Li, 6He)9B reaction. This reaction has been reinvestigated at the same energy and angle but with substantially improved resolution and statistics, and the present results provide no evidence for the previously reported peak. Spectra obtained at other energies and angles have very low background and yet similarly fail to exhibit a peak. In addition, no evidence for population of the mirror state is found in spectra taken for the reaction 10B(9Be, 10Be)9B at two bombarding energies. The energy and width of the expected 1 2+ state in 9B remain open questions for which several different theoretical descriptions offer quite different predictions.",

keywords = "Nuclear reactions",

author = "Catford, {W. N.} and Fifield, {L. K.} and Reber, {E. L.} and Kemper, {K. W.} and Brown, {J. D.}",

note = "Funding Information: We wish to thank Dr F.C. Barker for many useful discussions. This work was supported in part by the State of Florida and the U.S. National Science Foundation.",

year = "1992",

month = dec,

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doi = "10.1016/0375-9474(92)90021-B",

language = "English",

volume = "550",

pages = "517--526",

journal = "Nuclear Physics A",

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publisher = "Elsevier B.V.",

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TY - JOUR

T1 - The missing 1 2+ mirror state in 9B

AU - Catford, W. N.

AU - Fifield, L. K.

AU - Reber, E. L.

AU - Kemper, K. W.

AU - Brown, J. D.

N1 - Funding Information: We wish to thank Dr F.C. Barker for many useful discussions. This work was supported in part by the State of Florida and the U.S. National Science Foundation.

PY - 1992/12/14

Y1 - 1992/12/14

N2 - The status of the mirror state in 9B of the first excited 1 2+ 1.68 MeV state in 9Be is reviewed. The experimental evidence is inconclusive except for an apparent peak recently reported in a spectrum from the 9Be(6Li, 6He)9B reaction. This reaction has been reinvestigated at the same energy and angle but with substantially improved resolution and statistics, and the present results provide no evidence for the previously reported peak. Spectra obtained at other energies and angles have very low background and yet similarly fail to exhibit a peak. In addition, no evidence for population of the mirror state is found in spectra taken for the reaction 10B(9Be, 10Be)9B at two bombarding energies. The energy and width of the expected 1 2+ state in 9B remain open questions for which several different theoretical descriptions offer quite different predictions.

AB - The status of the mirror state in 9B of the first excited 1 2+ 1.68 MeV state in 9Be is reviewed. The experimental evidence is inconclusive except for an apparent peak recently reported in a spectrum from the 9Be(6Li, 6He)9B reaction. This reaction has been reinvestigated at the same energy and angle but with substantially improved resolution and statistics, and the present results provide no evidence for the previously reported peak. Spectra obtained at other energies and angles have very low background and yet similarly fail to exhibit a peak. In addition, no evidence for population of the mirror state is found in spectra taken for the reaction 10B(9Be, 10Be)9B at two bombarding energies. The energy and width of the expected 1 2+ state in 9B remain open questions for which several different theoretical descriptions offer quite different predictions.

KW - Nuclear reactions

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U2 - 10.1016/0375-9474(92)90021-B

DO - 10.1016/0375-9474(92)90021-B

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SN - 0375-9474

VL - 550

SP - 517

EP - 526

JO - Nuclear Physics A

JF - Nuclear Physics A

IS - 3

ER -

The missing 1 2⁺ mirror state in ⁹B

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