α-decay of excited states in 11C and 11B

N. Soić; M. Freer; L. Donadille; N. M. Clarke; P. J. Leask; W. N. Catford; K. L. Jones; D. Mahboub; B. R. Fulton; B. J. Greenhalgh; D. L. Watson; D. C. Weisser

doi:10.1016/j.nuclphysa.2004.06.027

α-decay of excited states in ¹¹C and ¹¹B

N. Soić^*, M. Freer, L. Donadille, N. M. Clarke, P. J. Leask, W. N. Catford, K. L. Jones, D. Mahboub, B. R. Fulton, B. J. Greenhalgh, D. L. Watson, D. C. Weisser

^*Corresponding author for this work

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34 Citations (Scopus)

Abstract

Studies of the 16 O(⁹Be,α⁷Be)¹⁴ C and ⁷ Li(⁹Be,α⁷Be)⁵ He reactions at E_beam=70 MeV have been performed using resonant particle spectroscopy techniques. The ¹¹ C excited states decaying into α + Be ⁷ (gs) are observed at 8.65, 9.85, 10.7 and 12.1 MeV as well as possible states at 12.6 and 13.4 MeV. This result is the first observation of α -decay for excited states above 9 MeV. The α + Li ⁷ (gs) decay of ¹¹ B excited states at 9.2, 10.3, 10.55, 11.2, (11.4), 11.8, 12.5, (13.0), 13.1, (14.0), 14.35, (17.4) and (18.6) MeV is observed. The decay processes are used to indicate the possible three-centre 2 α + ³ He (³H) cluster structure of observed states. Two rotational bands corresponding to very deformed structures are suggested for the positive-parity states. Excitations of some observed T = 1/2 resonances coincide with the energies of T = 3/2 states which are the isobaric analogs of the lowest ¹¹ Be states. Some of these states may have mixed isospin.

Original language	English
Pages (from-to)	271-290
Number of pages	20
Journal	Nuclear Physics A
Volume	742
Issue number	3-4
DOIs	https://doi.org/10.1016/j.nuclphysa.2004.06.027
Publication status	Published - 4 Oct 2004

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10.1016/j.nuclphysa.2004.06.027

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@article{c2bd89409ad04f4ebed1e7b934812afc,

title = "α-decay of excited states in 11C and 11B",

abstract = "Studies of the 16 O(9Be,α7Be)14 C and 7 Li(9Be,α7Be)5 He reactions at Ebeam=70 MeV have been performed using resonant particle spectroscopy techniques. The 11 C excited states decaying into α + Be 7 (gs) are observed at 8.65, 9.85, 10.7 and 12.1 MeV as well as possible states at 12.6 and 13.4 MeV. This result is the first observation of α -decay for excited states above 9 MeV. The α + Li 7 (gs) decay of 11 B excited states at 9.2, 10.3, 10.55, 11.2, (11.4), 11.8, 12.5, (13.0), 13.1, (14.0), 14.35, (17.4) and (18.6) MeV is observed. The decay processes are used to indicate the possible three-centre 2 α + 3 He (3H) cluster structure of observed states. Two rotational bands corresponding to very deformed structures are suggested for the positive-parity states. Excitations of some observed T = 1/2 resonances coincide with the energies of T = 3/2 states which are the isobaric analogs of the lowest 11 Be states. Some of these states may have mixed isospin.",

keywords = "E=70 MeV, Li(Be,αLi), Measured particle spectra. B, C deduced exated states J,π,α-decay properties, rotational bands, cluster structure, Nuclear reactions O(Be, α Be), E=70 MeV",

author = "N. Soi{\'c} and M. Freer and L. Donadille and Clarke, {N. M.} and Leask, {P. J.} and Catford, {W. N.} and Jones, {K. L.} and D. Mahboub and Fulton, {B. R.} and Greenhalgh, {B. J.} and Watson, {D. L.} and Weisser, {D. C.}",

year = "2004",

month = oct,

day = "4",

doi = "10.1016/j.nuclphysa.2004.06.027",

language = "English",

volume = "742",

pages = "271--290",

journal = "Nuclear Physics A",

issn = "0375-9474",

publisher = "Elsevier B.V.",

number = "3-4",

}

TY - JOUR

T1 - α-decay of excited states in 11C and 11B

AU - Soić, N.

AU - Freer, M.

AU - Donadille, L.

AU - Clarke, N. M.

AU - Leask, P. J.

AU - Catford, W. N.

AU - Jones, K. L.

AU - Mahboub, D.

AU - Fulton, B. R.

AU - Greenhalgh, B. J.

AU - Watson, D. L.

AU - Weisser, D. C.

PY - 2004/10/4

Y1 - 2004/10/4

N2 - Studies of the 16 O(9Be,α7Be)14 C and 7 Li(9Be,α7Be)5 He reactions at Ebeam=70 MeV have been performed using resonant particle spectroscopy techniques. The 11 C excited states decaying into α + Be 7 (gs) are observed at 8.65, 9.85, 10.7 and 12.1 MeV as well as possible states at 12.6 and 13.4 MeV. This result is the first observation of α -decay for excited states above 9 MeV. The α + Li 7 (gs) decay of 11 B excited states at 9.2, 10.3, 10.55, 11.2, (11.4), 11.8, 12.5, (13.0), 13.1, (14.0), 14.35, (17.4) and (18.6) MeV is observed. The decay processes are used to indicate the possible three-centre 2 α + 3 He (3H) cluster structure of observed states. Two rotational bands corresponding to very deformed structures are suggested for the positive-parity states. Excitations of some observed T = 1/2 resonances coincide with the energies of T = 3/2 states which are the isobaric analogs of the lowest 11 Be states. Some of these states may have mixed isospin.

AB - Studies of the 16 O(9Be,α7Be)14 C and 7 Li(9Be,α7Be)5 He reactions at Ebeam=70 MeV have been performed using resonant particle spectroscopy techniques. The 11 C excited states decaying into α + Be 7 (gs) are observed at 8.65, 9.85, 10.7 and 12.1 MeV as well as possible states at 12.6 and 13.4 MeV. This result is the first observation of α -decay for excited states above 9 MeV. The α + Li 7 (gs) decay of 11 B excited states at 9.2, 10.3, 10.55, 11.2, (11.4), 11.8, 12.5, (13.0), 13.1, (14.0), 14.35, (17.4) and (18.6) MeV is observed. The decay processes are used to indicate the possible three-centre 2 α + 3 He (3H) cluster structure of observed states. Two rotational bands corresponding to very deformed structures are suggested for the positive-parity states. Excitations of some observed T = 1/2 resonances coincide with the energies of T = 3/2 states which are the isobaric analogs of the lowest 11 Be states. Some of these states may have mixed isospin.

KW - E=70 MeV

KW - Li(Be,αLi)

KW - Measured particle spectra. B, C deduced exated states J,π,α-decay properties, rotational bands, cluster structure

KW - Nuclear reactions O(Be, α Be), E=70 MeV

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U2 - 10.1016/j.nuclphysa.2004.06.027

DO - 10.1016/j.nuclphysa.2004.06.027

M3 - Article

SN - 0375-9474

VL - 742

SP - 271

EP - 290

JO - Nuclear Physics A

JF - Nuclear Physics A

IS - 3-4

ER -

α-decay of excited states in ¹¹C and ¹¹B

Abstract

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