Low-lying resonance states in the 9Be continuum

Prezado, Yolanda; Borge, María José García; Diget, C. Aa.; Fraile, L. M.; Fulton, B. R.; Fynbo, H. O. U.; Jeppesen, H.; Jonson, B.; Meister, M.; Nilsson, T.; Nyman, G.; Riisager, K.; Tengblad, O.; Wilhelmsen, Katarina

doi:10.1016/j.physletb.2005.05.030

Cited by 30 publications

(49 citation statements)

References 25 publications

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“…This is intuitively appealing, since the alternative channels of 8 Be(2 + ) and 5 He(p 1/2 ) are rather high lying. Also, more recently, contributions through such channels are extracted from experimental analysis [25,27], although given with reservations and uncertainties. Furthermore, the β feeding, the width, and the decay channel are linked together for broad resonances in data analysis [21].…”

Section: B Momentum Distributionsmentioning

confidence: 99%

“…The structure of 9 Be has been extensively studied, both theoretically [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] and experimentally [17][18][19][20][21][22][23][24][25][26][27], but there are still large uncertainties in the structure and decay of the low-lying excited states. This is surprising and worrisome in view of the great effort and the expected rather accurate approximation as a simple three-body system where the intrinsic degrees of freedom are inactive.…”

Section: Introductionmentioning

confidence: 99%

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Structure and three-body decay ofBe9resonances

et al. 2010

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The complex-rotated hyperspherical adiabatic method is used to study the decay of low-lying 9 Be resonances into one neutron and two α particles. We investigate the six resonances above the breakup threshold and below 6 MeV: 1/2 ± , 3/2 ± , and 5/2 ± . The short-distance properties of each resonance are studied, and the different angular momentum and parity configurations of the 8 Be and 5 He two-body substructures are determined. We compute the branching ratio for sequential decay via the 8 Be ground state, which qualitatively is consistent with measurements. We extract the momentum distributions after decay directly into the three-body continuum from the large-distance asymptotic structures. The kinematically complete results are presented as Dalitz plots as well as projections on given neutron and α energy. The distributions are discussed and, in most cases, found to agree with available experimental data.

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Section: B Momentum Distributionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structure and three-body decay ofBe9resonances

et al. 2010

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“…And it clearly reproduces the singles data better than the simulationsof sequential decay. The energy region above 450 keV that cannot be described by the democartic decay is assigned to the break-up of a level at 5 MeV in 9 Be [6].…”

Section: Pos(nic-ix)135mentioning

confidence: 99%

“…Recent calculations by Buchmann et al [1] show that, at high temperatures, reaction channels through excited states in 9 Be above the 1/2 + are favoured. Calculations using the microscopic cluster model [3,4] and a recent experiment [5,6] show that the 5 He+α channel is dominant for high spin states. Therefore, if one wants to precisely know the reaction rate in a wide range of temperatures it will be necessary to take into account this channel.…”

Section: Motivation and Introductionmentioning

confidence: 99%

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Study of the Beta-delayed multiple particle break-up of the 2.43 MeV state in Be-9

Flores¹,

Borge²,

Fynbo³

et al. 2010

Proceedings of International Symposium on Nuclear Astrophysics - Nuclei in the Cosmos - IX — PoS(NIC-IX)

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The aim of this work is to study the β -delayed multiparticle break-up of the 5/2 − state in 9 Be at 2.43 MeV excitation energy. This process is relevant as it has been proposed recently that this level plays a role in the α(αn,γ) 9 Be reaction. This state breaks-up in 2α+n, and sequential as well as direct ("democratic") decay have previously been considered. In our work energy and direction of the two emitted α particles has been measured, while those of the neutron have been reconstructed. The sequential decay is considered using the R-matrix formalism. For the democratic decay the hyper-spherical harmonics functions are used. The different decay processes are compared with the data using the Monte-Carlo method. Our preliminary results indicate that the data is better described when democratic decay is assumed.

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Beta-delayed (multi-)particle decay studies

Tengblad¹,

Diget²

2012

Three Decades of Research Using IGISOL Technique at the University of Jyväskylä

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Low-lying resonance states in the 9Be continuum

Cited by 30 publications

References 25 publications

Structure and three-body decay ofBe9resonances

Structure and three-body decay ofBe9resonances

Study of the Beta-delayed multiple particle break-up of the 2.43 MeV state in Be-9

Beta-delayed (multi-)particle decay studies

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