R-matrix analysis of the beta decays of N-12 and B-12

S. Hyldegaard; M. Alcorta; B. Bastin; M. J. G. Borge; R. Boutami; S. Brandenburg; J. Buscher; P. Dendooven; C. Aa Diget; P. Van Duppen; T. Eronen; S. P. Fox; L. M. Fraile; B. R. Fulton; H. O. U. Fynbo; J. Huikari; M. Huyse; H. B. Jeppesen; A. S. Jokinen; B. Jonson; K. Jungmann; A. Kankainen; O. S. Kirsebom; M. Madurga; I. Moore; A. Nieminen; T. Nilsson; G. Nyman; G. J. G. Onderwater; H. Penttila; K. Perajarvi; R. Raabe; K. Riisager; S. Rinta-Antila; A. Rogachevskiy; A. Saastamoinen; M. Sohani; O. Tengblad; E. Traykov; Y. Wang; K. Wilhelmsen; H. W. Wilschut; J. Aysto

doi:10.1103/PhysRevC.81.024303

R-matrix analysis of the beta decays of N-12 and B-12

S. Hyldegaard^*, M. Alcorta, B. Bastin, M. J. G. Borge, R. Boutami, S. Brandenburg, J. Buscher, P. Dendooven, C. Aa Diget, P. Van Duppen, T. Eronen, S. P. Fox, L. M. Fraile, B. R. Fulton, H. O. U. Fynbo, J. Huikari, M. Huyse, H. B. Jeppesen, A. S. Jokinen, B. JonsonK. Jungmann, A. Kankainen, O. S. Kirsebom, M. Madurga, I. Moore, A. Nieminen, T. Nilsson, G. Nyman, G. J. G. Onderwater, H. Penttila, K. Perajarvi, R. Raabe, K. Riisager, S. Rinta-Antila, A. Rogachevskiy, A. Saastamoinen, M. Sohani, O. Tengblad, E. Traykov, Y. Wang, K. Wilhelmsen, H. W. Wilschut, J. Aysto

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

The beta decays of N-12 and B-12 have been studied at KVI and JYFL to resolve the composition of the broad and interfering 0(+) and 2(+) strengths in the triple-alpha continuum. For the first time a complete treatment of 3 alpha decay is presented including all major breakup channels. A multilevel, many-channel R-matrix formalism has been developed for the complete description of the breakup in combination with the recently published separate analysis of angular correlations. We find that, in addition to the Hoyle state at 7.65 MeV, more than one 0(+) and 2(+) state is needed to reproduce the spectra. Broad 0(3)(+) and 2(2)(+) states are found between 10.5 and 12 MeV in this work. The presence of beta strength up to the N-12 Q-value window suggests the presence of additional 0(+) and 2(+) components in the C-12 structure at energies above 12.7 MeV.

Original language	English
Pages (from-to)	024303
Number of pages	1
Journal	PHYSICAL REVIEW C-NUCLEAR PHYSICS
Volume	81
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevC.81.024303
Publication status	Published - 2010
Externally published	Yes

Keywords

ALPHA-PARTICLES
EXCITED-STATES
C-12
RESONANCES
NUCLEI
HE-8

Access to Document

10.1103/PhysRevC.81.024303

Cite this

Hyldegaard, S., Alcorta, M., Bastin, B., Borge, M. J. G., Boutami, R., Brandenburg, S., Buscher, J., Dendooven, P., Diget, C. A., Van Duppen, P., Eronen, T., Fox, S. P., Fraile, L. M., Fulton, B. R., Fynbo, H. O. U., Huikari, J., Huyse, M., Jeppesen, H. B., Jokinen, A. S., ... Aysto, J. (2010). R-matrix analysis of the beta decays of N-12 and B-12. PHYSICAL REVIEW C-NUCLEAR PHYSICS, 81(2), 024303. https://doi.org/10.1103/PhysRevC.81.024303

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title = "R-matrix analysis of the beta decays of N-12 and B-12",

abstract = "The beta decays of N-12 and B-12 have been studied at KVI and JYFL to resolve the composition of the broad and interfering 0(+) and 2(+) strengths in the triple-alpha continuum. For the first time a complete treatment of 3 alpha decay is presented including all major breakup channels. A multilevel, many-channel R-matrix formalism has been developed for the complete description of the breakup in combination with the recently published separate analysis of angular correlations. We find that, in addition to the Hoyle state at 7.65 MeV, more than one 0(+) and 2(+) state is needed to reproduce the spectra. Broad 0(3)(+) and 2(2)(+) states are found between 10.5 and 12 MeV in this work. The presence of beta strength up to the N-12 Q-value window suggests the presence of additional 0(+) and 2(+) components in the C-12 structure at energies above 12.7 MeV.",

keywords = "ALPHA-PARTICLES, EXCITED-STATES, C-12, RESONANCES, NUCLEI, HE-8",

author = "S. Hyldegaard and M. Alcorta and B. Bastin and Borge, {M. J. G.} and R. Boutami and S. Brandenburg and J. Buscher and P. Dendooven and Diget, {C. Aa} and {Van Duppen}, P. and T. Eronen and Fox, {S. P.} and Fraile, {L. M.} and Fulton, {B. R.} and Fynbo, {H. O. U.} and J. Huikari and M. Huyse and Jeppesen, {H. B.} and Jokinen, {A. S.} and B. Jonson and K. Jungmann and A. Kankainen and Kirsebom, {O. S.} and M. Madurga and I. Moore and A. Nieminen and T. Nilsson and G. Nyman and Onderwater, {G. J. G.} and H. Penttila and K. Perajarvi and R. Raabe and K. Riisager and S. Rinta-Antila and A. Rogachevskiy and A. Saastamoinen and M. Sohani and O. Tengblad and E. Traykov and Y. Wang and K. Wilhelmsen and Wilschut, {H. W.} and J. Aysto",

year = "2010",

doi = "10.1103/PhysRevC.81.024303",

language = "English",

volume = "81",

pages = "024303",

journal = "PHYSICAL REVIEW C-NUCLEAR PHYSICS",

issn = "0556-2813",

publisher = "American Physical Society",

number = "2",

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Hyldegaard, S, Alcorta, M, Bastin, B, Borge, MJG, Boutami, R, Brandenburg, S, Buscher, J, Dendooven, P, Diget, CA, Van Duppen, P, Eronen, T, Fox, SP, Fraile, LM, Fulton, BR, Fynbo, HOU, Huikari, J, Huyse, M, Jeppesen, HB, Jokinen, AS, Jonson, B, Jungmann, K, Kankainen, A, Kirsebom, OS, Madurga, M, Moore, I, Nieminen, A, Nilsson, T, Nyman, G, Onderwater, GJG, Penttila, H, Perajarvi, K, Raabe, R, Riisager, K, Rinta-Antila, S, Rogachevskiy, A, Saastamoinen, A, Sohani, M, Tengblad, O, Traykov, E, Wang, Y, Wilhelmsen, K, Wilschut, HW & Aysto, J 2010, 'R-matrix analysis of the beta decays of N-12 and B-12', PHYSICAL REVIEW C-NUCLEAR PHYSICS, vol. 81, no. 2, pp. 024303. https://doi.org/10.1103/PhysRevC.81.024303

TY - JOUR

T1 - R-matrix analysis of the beta decays of N-12 and B-12

AU - Hyldegaard, S.

AU - Alcorta, M.

AU - Bastin, B.

AU - Borge, M. J. G.

AU - Boutami, R.

AU - Brandenburg, S.

AU - Buscher, J.

AU - Dendooven, P.

AU - Diget, C. Aa

AU - Van Duppen, P.

AU - Eronen, T.

AU - Fox, S. P.

AU - Fraile, L. M.

AU - Fulton, B. R.

AU - Fynbo, H. O. U.

AU - Huikari, J.

AU - Huyse, M.

AU - Jeppesen, H. B.

AU - Jokinen, A. S.

AU - Jonson, B.

AU - Jungmann, K.

AU - Kankainen, A.

AU - Kirsebom, O. S.

AU - Madurga, M.

AU - Moore, I.

AU - Nieminen, A.

AU - Nilsson, T.

AU - Nyman, G.

AU - Onderwater, G. J. G.

AU - Penttila, H.

AU - Perajarvi, K.

AU - Raabe, R.

AU - Riisager, K.

AU - Rinta-Antila, S.

AU - Rogachevskiy, A.

AU - Saastamoinen, A.

AU - Sohani, M.

AU - Tengblad, O.

AU - Traykov, E.

AU - Wang, Y.

AU - Wilhelmsen, K.

AU - Wilschut, H. W.

AU - Aysto, J.

PY - 2010

Y1 - 2010

N2 - The beta decays of N-12 and B-12 have been studied at KVI and JYFL to resolve the composition of the broad and interfering 0(+) and 2(+) strengths in the triple-alpha continuum. For the first time a complete treatment of 3 alpha decay is presented including all major breakup channels. A multilevel, many-channel R-matrix formalism has been developed for the complete description of the breakup in combination with the recently published separate analysis of angular correlations. We find that, in addition to the Hoyle state at 7.65 MeV, more than one 0(+) and 2(+) state is needed to reproduce the spectra. Broad 0(3)(+) and 2(2)(+) states are found between 10.5 and 12 MeV in this work. The presence of beta strength up to the N-12 Q-value window suggests the presence of additional 0(+) and 2(+) components in the C-12 structure at energies above 12.7 MeV.

AB - The beta decays of N-12 and B-12 have been studied at KVI and JYFL to resolve the composition of the broad and interfering 0(+) and 2(+) strengths in the triple-alpha continuum. For the first time a complete treatment of 3 alpha decay is presented including all major breakup channels. A multilevel, many-channel R-matrix formalism has been developed for the complete description of the breakup in combination with the recently published separate analysis of angular correlations. We find that, in addition to the Hoyle state at 7.65 MeV, more than one 0(+) and 2(+) state is needed to reproduce the spectra. Broad 0(3)(+) and 2(2)(+) states are found between 10.5 and 12 MeV in this work. The presence of beta strength up to the N-12 Q-value window suggests the presence of additional 0(+) and 2(+) components in the C-12 structure at energies above 12.7 MeV.

KW - ALPHA-PARTICLES

KW - EXCITED-STATES

KW - C-12

KW - RESONANCES

KW - NUCLEI

KW - HE-8

U2 - 10.1103/PhysRevC.81.024303

DO - 10.1103/PhysRevC.81.024303

M3 - Article

SN - 0556-2813

VL - 81

SP - 024303

JO - PHYSICAL REVIEW C-NUCLEAR PHYSICS

JF - PHYSICAL REVIEW C-NUCLEAR PHYSICS

IS - 2

ER -