<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Be</mml:mi></mml:mrow><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>11</mml:mn></mml:mrow></mml:mmultiscripts><mml:mo stretchy="false">(</mml:mo><mml:mi>β</mml:mi><mml:mi mathvariant="normal">p</mml:mi><mml:mo stretchy="false">)</mml:mo></mml:math>, a quasi-free neutron decay?

Riisager, K.; Forstner, O.; Borge, María José García; Briz, J. A.; Carmona-Gallardo, M.; Fraile, L. M.; Fynbo, H. O. U.; Giles, T.; Gottberg, A.; Heinz, A.; Johansen, Jacob; Jonson, B.; Kurcewicz, J.; Lund, M. V.; Nilsson, T.; Nyman, G.; Rapisarda, E.; Steier, Peter; Tengblad, O.; Thies, R.; Winkler, Stephan

doi:10.1016/j.physletb.2014.03.062

Cited by 43 publications

(43 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The result is 1.3(3) · 10 −5 , in agreement with the previous indirect measurement [4]. The measured branching ratio and resonance energy yields a very small log(ft )=4.8 (4), which suggests a strongly allowed β decay. From the β decay selection rule of the J π = 1/2 + 11 Be gs.s, we can assume ∆J = 0, 1 and no change in parity, therefore we propose J π = (1/2, 3/2 + ) for the newly found resonance.…”

supporting

confidence: 90%

“…In summary, we have performed the first direct observation of a β − p + decay. This new result is in agreement with the previous indirect measurement [4]. The use of the pAT-TPC also allowed for a precise measurement of the emitted proton energy, which in turn clarified that the decay proceeds sequentially though a narrow resonance [E = 11425 (20) keV, Γ = 12(5) keV, J π = (1/2, 3/2 + )] in 11 B.…”

supporting

confidence: 89%

“…In order to efficiently detect and identify every particle emitted in the β-decay of 11 Be, specially protons of ∼ 200 keV of energy [4,8], the experiment was performed with the prototype Active Target Time Projection Chamber (pAT-TPC) [17]. This device allows for efficient and high-resolution measurement of very low energy particles.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Direct Observation of Proton Emission in Be11

Ayyad¹,

Olaizola²,

Mittig³

et al. 2019

Phys. Rev. Lett.

View full text Add to dashboard Cite

The elusive β − p + decay was observed in 11 Be by directly measuring the emitted protons and their energy distribution for the first time with the prototype Active Target Time Projection Chamber (pAT-TPC) in an experiment performed at ISAC-TRIUMF. The measured β − p + branching ratio is orders of magnitude larger than any previous theoretical model predicted. This can be explained by the presence of a narrow resonance in 11 B above the proton separation energy.

show abstract

supporting

confidence: 90%

supporting

confidence: 89%

See 1 more Smart Citation

Direct Observation of Proton Emission in Be11

Ayyad¹,

Olaizola²,

Mittig³

et al. 2019

Phys. Rev. Lett.

View full text Add to dashboard Cite

show abstract

“…The hindrance of these transitions not only results in 11 Be having an unusually long half-life (13.81 s [3]), but also leads to a relative enhancement of branches with a small Q β . This has recently allowed the detection of the rather exotic β − p decay branch [4] and it makes 11 Be ideal for studying the hypothesised dark decay of the neutron [5,6].…”

Section: Introductionmentioning

confidence: 99%

Clarification of large-strength transitions in the β decay of Be11

et al. 2019

Self Cite

View full text Add to dashboard Cite

The shape and normalisation of the β-delayed α spectrum from 11 Be was measured by implanting 11 Be ions in a segmented Si detector. The spectrum is found to be dominated by a well-known transition to the 3/2 + state at Ex = 9.87 MeV in 11 B. A significant increase in the observed decay strength towards the higher end of the Q β window means, however, that the 9.87 MeV state cannot alone be responsible for the transition. Using the R-matrix framework we find that the inclusion of an extra 3/2 + state at Ex = 11.49(10) MeV is required in order to obtain a satisfactory description of the spectrum. Both states show large widths towards α decay, exhausting significant fractions of the Wigner limit, a typical signature of α clusterisation. The observed Gamow-Teller strength indicate large overlaps between the two states and the ground state of 11 Be.

show abstract

“…There are several examples where this technique could be applied, e.g. the study of β-delayed proton emission of the halo nucleus 11 Be [10].…”

Section: In-ring Decay Measurements and Laser Spectroscopymentioning

confidence: 99%

TSR: A Storage Ring for HIE-ISOLDE

et al. 2016

View full text Add to dashboard Cite

It is planned to install the heavy-ion, low-energy ring TSR, currently at the Max-Planck-Institute for Nuclear Physics in Heidelberg, at the HIE-ISOLDE facility in CERN, Geneva. Such a facility will provide a capability for experiments with stored, cooled secondary beams that is rich and * Presented at the XXXIV Mazurian Lakes Conference on Physics, Piaski, Poland, September 6-13, 2015.(627) 628 P.A. Butler et al.varied, spanning from studies of nuclear ground-state properties and reaction studies of astrophysical relevance, to investigations with highly-charged ions and pure isomeric beams. In addition to experiments performed using beams recirculating within the ring, the cooled beams can be extracted and exploited by external spectrometers for high-precision measurements. The capabilities of the ring facility as well as some physics cases will be presented, together with a brief report on the status of the project.

show abstract

Be11(βp), a quasi-free neutron decay?

Cited by 43 publications

References 23 publications

Direct Observation of Proton Emission in Be11

Direct Observation of Proton Emission in Be11

Clarification of large-strength transitions in the β decay of Be11

TSR: A Storage Ring for HIE-ISOLDE

Contact Info

Product

Resources

About