Rare βp decays in light nuclei

Borge, María José García; Fraile, L. M.; Fynbo, H. O. U.; Jonson, B.; Kirsebom, O. S.; Nilsson, T.; Nyman, G.; Possnert, Göran; Riisager, K.; Tengblad, O.

doi:10.1088/0954-3899/40/3/035109

Cited by 32 publications

(49 citation statements)

References 33 publications

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“…In a first attempt, the signal was not strong enough and a β − p branching ratio of 2.5(25) × 10 −6 was obtained [15]. Due to the improvements in the production of 11 Be at ISOLDE and a higher sensitivity in the AMS detection of 10 Be, the experiment was tried again in 2012.…”

Section: Exotic Decay Studies At Isoldementioning

confidence: 99%

Measurements of Thermal and Resonance Neutron Fluence and Induced Radioactivity Inside Bunkers of Medical Linear Accelerators in the Center of Oncology in Opole, Poland

Bieniasiewicz¹,

Konefał²,

Wendykier³

et al. 2016

Acta Phys. Pol. B

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The ISOLDE radioactive beam facility is the dedicated CERN installation for the production and acceleration of radioactive nuclei. Exotic nuclei of most chemical elements are available for the study of nuclear structure, nuclear astrophysics, fundamental symmetries and atomic physics, as well as for applications in condensed matter and life sciences. In order to broaden the scientific opportunities beyond the reach of the present facility, the ongoing HIE-ISOLDE (High Intensity and Energy) project provides major improvements in energy range, beam intensity and beam quality. A major element of the project is the increase of the final energy of the post-accelerated beams to 10 MeV/u throughout the periodic table. Physics with post-accelerated beams at 4 MeV/u has started this autumn. The increase in energy up to 10 MeV/u is fully funded and it will be implemented at the rate of one cryo-module per year reaching 10 MeV/u for A/q = 4.5 at the start of 2018. In this contribution, a description of the ISOLDE facility including some highlights will be discussed. The present status of the HIE-ISOLDE project will be described as well as the first experiment realised this year.

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Section: Exotic Decay Studies At Isoldementioning

confidence: 99%

Measurements of Thermal and Resonance Neutron Fluence and Induced Radioactivity Inside Bunkers of Medical Linear Accelerators in the Center of Oncology in Opole, Poland

Bieniasiewicz¹,

Konefał²,

Wendykier³

et al. 2016

Acta Phys. Pol. B

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“…Estimates of the branching ratio indicates that this will be a very rare process [7] due to the low energy available, see table 1; the branching ratio will in most a…”

Section: The 11 Be(βp) Decaymentioning

confidence: 99%

“…Estimates of the branching ratio indicates that this will be a very rare process [7] due to the low energy available, see estimates be a few times 10 −8 . Looking for protons of kinetic energy a few hundred keV with this relative intensity is challenging, so the two attempts we have made have instead aimed at detecting the remaining nucleus, 10 Be, that exists only in very small quantities on earth.…”

Section: The 11 Be(βp) Decaymentioning

confidence: 99%

“…The IS374 experiment made sample collections in 2001 and the amount of remaining 10 Be in the samples were determined in an accelerator mass spectromery (AMS) experiment in Uppsala in 2008, details of the experimental procedures can be found in a recent paper [7]. No conclusive evidence for the decay were found.…”

Section: The Is374 Experimentsmentioning

confidence: 99%

“…The number for the 11 Li sample was below 10 5 and consistent with the lack of observed γ-rays from the decay of 11 Li. The number for the 11 Be sample was just above 10 7 .…”

Section: The Is541 Experimentsmentioning

confidence: 99%

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Beta decay to continuum states: the case of¹¹Be

Riisager

2014

EPJ Web of Conferences

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Abstract. Beta decay in exotic nuclei can lead to multi-particle final states. This contribution discusses briefly what decay mechanisms may enter in such decays and presents, on behalf of the IS541 collaboration at ISOLDE/CERN, preliminary data from a search for the beta-delayed proton decay of the halo nucleus 11 Be. Beta-particle decay mechanismThe Q-values for beta-decays increase as one moves towards the driplines and eventually become larger than the particle separation energies in the daughter nuclei. This allows population of final states containing, apart from the beta particle and the associated (anti)neutrino, one or more particles (protons, neutrons or heavier particles) in continuum states and a recoiling final nucleus. Such processes allow many different physics questions to be probed experimentally -see [1,2] for recent reviews -and are normally referred to as beta-delayed particle emission. However, this name suggests a two-step process: the beta decay feeding resonance states in the daughter nucleus that subsequently decay by particle emission. The other possible decay mechanism, beta decays feeding the continuum states directly, deserves consideration as well.Some indication for decays going directly into the continuum exist for halo nuclei, see [3][4][5] and references therein for details on the halo structure. The two-neutron halo nuclei 6 He and 11 Li appear both to have beta-delayed deuteron emission taking place directly into the continuum [1,6]. For 11 Li this process has a branching ratio of the order of 10 −4 , the low value mainly being due to the small energy window, whereas cancellation effects reduces the branching ratio for 6 He down to the 10 −6 level. The simple-minded model of the decays is that one of the two halo neutrons beta-decay into a proton and combines with the other one to form a deuteron. A complicating factor in the theoretical description of these two decays is therefore the "two neutron to deuteron" overlap that is sensitive to the correlations between the two neutrons. This is an interesting physics problem, but if the focus is on investigating the decay mechanism a much cleaner case would be the beta-delayed proton decay of a single-neutron halo nucleus. The 11 Be(βp) decayThe most favourable case is 11 Be(βp). Estimates of the branching ratio indicates that this will be a very rare process [7] due to the low energy available, see table 1; the branching ratio will in most a

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Electron Capture of $$^8$$ 8 B into Highly Excited States of $$^8$$ 8 Be

Víñals¹

2019

Springer Proceedings in Physics

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Energy differences between analogue states in the T=1/2 23 Mg-23 Ma mirror nuclei have been measured along the rotational yrast bands with the EXOGAM + Neutron Wall + DIAMANT setup at GANIL. The nuclei of interest have been populated via the 12 C+ 16 O fusion evaporation reaction. This allows us to search for effects arising from isospin-symmetry breaking interactions (ISB) and/or shape changes. Data are interpreted in the shell model framework following the method successfully applied to nuclei in the f 1/2 shell.

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Rare βp decays in light nuclei

Cited by 32 publications

References 33 publications

Measurements of Thermal and Resonance Neutron Fluence and Induced Radioactivity Inside Bunkers of Medical Linear Accelerators in the Center of Oncology in Opole, Poland

Measurements of Thermal and Resonance Neutron Fluence and Induced Radioactivity Inside Bunkers of Medical Linear Accelerators in the Center of Oncology in Opole, Poland

Beta decay to continuum states: the case of¹¹Be

Electron Capture of $$^8$$ 8 B into Highly Excited States of $$^8$$ 8 Be

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Rare βp decays in light nuclei

Cited by 32 publications

References 33 publications

Measurements of Thermal and Resonance Neutron Fluence and Induced Radioactivity Inside Bunkers of Medical Linear Accelerators in the Center of Oncology in Opole, Poland

Measurements of Thermal and Resonance Neutron Fluence and Induced Radioactivity Inside Bunkers of Medical Linear Accelerators in the Center of Oncology in Opole, Poland

Beta decay to continuum states: the case of11Be

Electron Capture of $$^8$$ 8 B into Highly Excited States of $$^8$$ 8 Be

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Product

Resources

About

Beta decay to continuum states: the case of¹¹Be