β-decay half-lives and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>β</mml:mi></mml:mrow></mml:math>-delayed neutron emission probabilities of nuclei in the region<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>A</mml:mi><mml:mo>≲</mml:mo><mml:mn>110</mml:mn></mml:mrow></mml:math>, relevant for the r process

Pereira, J.; Hennrich, S.; Aprahamian, A.; Arndt, O.; Becerril, A.; Elliot, T.; Estradé, A.; Galaviz, D.; Kessler, R.; Kratz, K. L.; Lorusso, G.; Mantica, P. F.; Matoš, M.; Möller, P.; Montes, F.; Pfeiffer, B.; Schatz, H.; Schertz, F.; Schnorrenberger, L.; Smith, E.; Stolz, A.; Quinn, M.; Walters, W. B.; Wöhr, A.

doi:10.1103/physrevc.79.035806

Cited by 124 publications

(43 citation statements)

References 85 publications

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“…2. The experimental half-life value of 154(6) ms is in accord with the previous results obtained with the IGISOL separator: 130(50) ms [11], 170 (20) ms [12], and with inflight fragment separator 160 +50 −40 ms [13]. Recent trap-assisted studies of 109,111 Mo β decays provided new data on the structure of low-lying states in the daughter Tc isotopes, in particular signatures of oblate deformation in 111 Tc were found [14].…”

Section: Recent Achievementssupporting

confidence: 80%

Trap-assisted studies of odd, neutron-rich isotopes from Tc to Pd

et al. 2012

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We review the present and future of trap-assisted structure studies of odd, neutron-rich Tc, Ru, Rh and Pd isotopes at the limits of present experimental techniques. These nuclei of refractory elements are produced in light-particle induced fission and filtered by their mass number with the IGISOL mass separator. Further mass separation with the JYFLTRAP Penning trap system provides a clean, monoisotopic beam perfectly suited for precise nuclear spectroscopy. Connecting the IGISOL and the JYFLTRAP facilities to the recently installed MCC30/15 cyclotron opens new prospects for post-trap spectroscopy of very exotic, neutron-rich nuclei.

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Section: Recent Achievementssupporting

confidence: 80%

Trap-assisted studies of odd, neutron-rich isotopes from Tc to Pd

et al. 2012

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“…The NERO detector, together with the BCS, has been employed in numerous r-process motivated experiments performed at NSCL [5,6,35,36,37]. The exotic nuclei of interest are implanted in a 40×40-pixel DSSD in the BCS.…”

Section: Measurement Of P Nmentioning

confidence: 99%

“…For the nuclear species analyzed in Refs. [5,6,35,36,37], β-neutron coincidences associated with descendant nuclei other than the β-decay daughter were negligible. In this case, using the Batemann equations [38], it is possible to write explicitly the value of N ββn as:…”

Section: Measurement Of P Nmentioning

confidence: 99%

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The neutron long counter NERO for studies of neutron emission in the r-process

Pereira

Hosmer

Lorusso

et al. 2010

Nuclear Instruments and Methods in Physics Research Section A:

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The neutron long counter NERO was built at the National Superconducting Cyclotron Laboratory (NSCL), Michigan State University, for measuring β-delayed neutron-emission probabilities. The detector was designed to work * Corresponding author. Tel.: +1 517 9087428; fax: +1 517 3535967Email address: pereira@nscl.msu.edu (J. Pereira) 1 Present address: Navy Nuclear Power School, Goose Creek, South Carolina, USA 2 Present address: Los Alamos National Laboratory, MS E540, Los Alamos, New Mexico, USA Preprint submitted to ElsevierMay 28, 2018 in conjunction with a β-decay implantation station, so that β decays and β-delayed neutrons emitted from implanted nuclei can be measured simultaneously. The high efficiency of about 40%, for the range of energies of interest, along with the small background, are crucial for measuring β-delayed neutron emission branchings for neutron-rich r-process nuclei produced as low intensity fragmentation beams in in-flight separator facilities.

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“…By including the β 30 deformation, a pear-like ground state of 112 Zr is predicted with the functional DD-PC1 [21]. From the experimental point of view, the analysis of rotational bands, β-decay half-lives, and lifetimes of the first 2 + states reveals that some of these nuclei are well deformed [62,[152][153][154][155][156][157][158][159][160][161][162][163][164] Next we give some numerical details and illustrative calculations of the MDC-RHB model. Then we present and discuss the results for neutron-rich even-even Zr isotopes calculated with functionals DD-PC1 [111] and PC-PK1 [166].…”

Section: Resultsmentioning

confidence: 99%

Tetrahedral shapes of neutron-rich Zr isotopes from a multidimensionally constrained relativistic Hartree-Bogoliubov model

et al. 2017

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We develop a multidimensionally constrained relativistic Hartree-Bogoliubov (MDC-RHB) model in which the pairing correlations are taken into account by making the Bogoliubov transformation. In this model, the nuclear shape is assumed to be invariant under the reversion of x and y axes; i.e., the intrinsic symmetry group is V4 and all shape degrees of freedom β λµ with even µ are included self-consistently. The RHB equation is solved in an axially deformed harmonic oscillator basis. A separable pairing force of finite range is adopted in the MDC-RHB model. The potential energy curves of neutron-rich even-even Zr isotopes are calculated with relativistic functionals DD-PC1 and PC-PK1 and possible tetrahedral shapes in the ground and isomeric states are investigated. The ground state shape of 110 Zr is predicted to be tetrahedral with both functionals and so is that of 112 Zr with the functional DD-PC1. The tetrahedral ground states are caused by large energy gaps around Z = 40 and N = 70 when β32 deformation is included. Although the inclusion of the β30 deformation can also reduce the energy around β20 = 0 and lead to minima with pear-like shapes for nuclei around 110 Zr, these minima are unstable due to their shallowness.

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β-decay half-lives andβ-delayed neutron emission probabilities of nuclei in the regionA≲110, relevant for the r process

Abstract: Measurements of the β-decay properties of A 110 r-process nuclei have been completed at the National Superconducting Cyclotron Laboratory, at Michigan State University.

Cited by 124 publications

References 85 publications

Trap-assisted studies of odd, neutron-rich isotopes from Tc to Pd

Trap-assisted studies of odd, neutron-rich isotopes from Tc to Pd

The neutron long counter NERO for studies of neutron emission in the r-process

Tetrahedral shapes of neutron-rich Zr isotopes from a multidimensionally constrained relativistic Hartree-Bogoliubov model

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