M. Wolińska-Cichocka

Oak Ridge National Laboratory

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R. Grzywacz

University of Tennessee at Knoxville

K. Miernik

University of Warsaw

M. Karny

University of Warsaw

N. T. Brewer

Vanderbilt University

C. J. Gross

Oak Ridge National Laboratory

M. Madurga

European Organization for Nuclear Research

K. P. Rykaczewski

Oak Ridge National Laboratory

S. V. Paulauskas

University of Tennessee at Knoxville

S. Padgett

Lawrence Livermore National Laboratory

A. Fijałkowska

University of Warsaw

Cooperative Institutions

University of Tennessee at Knoxville

109

University of Warsaw

Oak Ridge National Laboratory

National Centre for Nuclear Research

Centre National de la Recherche Scientifique

Oak Ridge Associated Universities

RIKEN Nishina Center

Vanderbilt University

GSI Helmholtz Centre for Heavy Ion Research

Michigan State University

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FIRST RESULTS OF DECAY HEAT MEASUREMENTS WITH MTAS AT THE HRIBF

M. Karny A. Fijałkowska Krzysztof Rykaczewski M. Wolińska-Cichocka B. C. Rasco

10.1142/9789814525435_others20

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Updated β -decay measurement of neutron-rich Cu74

Physical review. C (2018)

J. L. Tracy J. A. Winger B. C. Rasco Umesh Silwal Durga Siwakoti

The $\ensuremath{\beta}$ decay of neutron-rich $^{74}\mathrm{Cu}$ has been studied at the Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory. By using a high-resolution mass separator a purified $^{74}\mathrm{Cu}$ beam was obtained, thus allowing decay through its isobar chain to stable $^{74}\mathrm{Ge}$ without any decay chain member dominating. A total of $170\ensuremath{\gamma}$ rays were associated with $^{74}\mathrm{Cu}\phantom{\rule{4pt}{0ex}}\ensuremath{\beta}$ decay with 111 placed in the $^{74}\mathrm{Zn}$ level scheme. Updated $\ensuremath{\beta}$ feeding intensities and estimated $log(ft)$ values are presented, and new ${J}^{\ensuremath{\pi}}$ assignments are proposed using shell model calculations. The progression of simulated total absorption $\ensuremath{\gamma}$-ray spectroscopy (TAGS) based on proposed levels and $\ensuremath{\beta}$-feeding values from previous measurements to this evaluation are presented and demonstrate the need for a TAGS measurements for this and similar decays.

10.1103/physrevc.98.034309

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Study of Elastic Scattering of $^{10}{\mathrm {B}}$ Ions on $^{12}{\mathrm {C}}$ Nuclei at the Energy of 17.5 MeV

Acta Physica Polonica B (2020)

N. Amangeldi N. Burtebayev S.B. Sakuta M. Nassurlla J. Burtebayeva

The 2019 Mazurian Lakes Conference on Physics was held in Piaski, a vacation resort located at the lake of Bełdany in the heart of the Great Mazurian Lakes District, from the 1 st to 7 th of September 2019.It was the 36 th meeting in a series initiated over 50 years ago, in 1968, by Professor Zdzisław Wilhelmi and his students and collaborators.Throughout these years, the Mazurian conferences have gained a world-wide reputation for their high scientific merit and a unique atmosphere.

10.5506/aphyspolb.51.757

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Quasielastic Barrier Distributions for the $^{20}\mathrm {Ne}+^{92,94,95}\mathrm {Mo}$ Systems: Influence of Dissipation

Acta Physica Polonica B Proceedings Supplement (2024)

G. Colucci A. Trzcińska E. Piasecki E. Geraci B. Gnoffo

A comparative study of the quasielastic barrier distributions of the 20 Ne+ 92,94,95 Mo systems was performed at the Heavy Ion Laboratory (HIL) of the University of Warsaw.The experiment aimed to study the influence of dissipation due to single-particle excitations on the barrier distribution structure.The preliminary results indicate that the larger number of singleparticle excitations for the heaviest Mo isotopes leads to the smoothing of the barrier distribution, which loses the structure foreseen by the coupling to only collective excitations.Theoretical calculations performed including the coupling to the non-collective excitation are in good agreement with the experimental barrier distributions for the 20 Ne + 92,94,95 Mo systems.

10.5506/aphyspolbsupp.17.3-a23

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βandβ−ndecay of the neutron-richGe84nucleus

Physical review. C (2016)

A. Korgul K. P. Rykaczewski R. Grzywacz C. R. Bingham N. T. Brewer

The $\ensuremath{\beta}$-decay properties of the very neutron-rich $^{84}\mathrm{Ge}$ nucleus were studied at the Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory. Several new $\ensuremath{\gamma}$-transitions and levels were added to its decay scheme and the order of the two lowest-lying levels in the daughter $^{84}\mathrm{As}$ was corrected. For the first time $\ensuremath{\gamma}$ radiation following $\ensuremath{\beta}$-delayed neutron emission was observed. The shell-model calculations and apparent $\ensuremath{\beta}$ transition intensities were used to guide the spin assignment to the $^{84}\mathrm{As}$ levels, in particular for the low-energy part of the level scheme. The new spin-parity $({2}^{\ensuremath{-}})$ proposed for the ground state of $^{84}\mathrm{As}$ is supported also by the systematics of $N=51$ isotones.

10.1103/physrevc.93.064324

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Demonstration of the neutron tracking capability of NEXT array in time-of-flight measurements to improve energy resolution

Physical review. C (2022)

S. Neupane J. Heideman R. Grzywacz M. Cooper J. Hooker

Precise neutron-energy measurements are required to probe the nuclear structure effects of neutron-rich nuclei, where $\ensuremath{\beta}$-delayed neutron emission becomes a dominant decay mode. The Neutron dEtector with Xn Tracking (NEXT) array has been designed and constructed to measure $\ensuremath{\beta}$-delayed neutrons with better energy resolution. The new design localizes the neutron interaction position by optically segmenting the detector along the direction of the neutron flight path, reducing the associated uncertainties in the neutron time-of-flight measurements. This significantly improves the energy resolution without losing the necessary detection efficiency. The proof-of-principle and efficiency measurements showed promising results. This article details the implementation of the neutron tracking capability of NEXT array in time-of-flight measurements.

Time-of-Flight

Neutron Detection

Tracking (education)

Bonner sphere

10.1103/physrevc.106.044320

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Experimental study of the β decay of the very neutron-rich nucleus Ge85

Physical review. C (2017)

A. Korgul K. P. Rykaczewski R. Grzywacz C. R. Bingham N. T. Brewer

The $\ensuremath{\beta}$-decay properties of the very neutron-rich nucleus $^{85}\mathrm{Ge}$, produced in the proton-induced fission of $^{238}\mathrm{U}$, were studied at the Holifield Radioactive Ion Beam Facility at Oak Ridge National Laboratory. The level scheme of $\phantom{\rule{0.16em}{0ex}}_{33}^{85}\mathrm{As}_{52}$ populated in $^{85}\mathrm{Ge}\phantom{\rule{4pt}{0ex}}\ensuremath{\beta}\ensuremath{\gamma}$ decay was reconstructed and compared to shell-model calculations. The investigation of the systematics of low-energy levels in $N=52$ isotones together with shell-model analysis allowed us to provide an estimate of the low-energy structure of the more exotic $N=52$ isotone $^{81}\mathrm{Cu}$.

10.1103/physrevc.95.044305

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Beta-strength and anti-neutrino spectra from total absorption spectroscopy of a decay chain ¹⁴²Cs→¹⁴²Ba→¹⁴²La

EPJ Web of Conferences (2017)

M. Wolińska-Cichocka B. C. Rasco K. P. Rykaczewski N. T. Brewer D. W. Stracener

Beta decays of mass A = 142 isobaric chain starting from 142Cs have been investigated by means of Modular Total Absorption Spectrometer (MTAS) and on-line mass separation at Oak Ridge National Laboratory. The beta strength distribution derived for 142Cs decay from MTAS spectra is showing significant differences in β-feeding pattern when compared to the values listed at nuclear databases. MTAS results are shifting the associated anti-neutrino energy spectrum towards lower energies. A decay pattern deduced for 142Ba is similar to earlier reported results.

Beta decay

Isobaric process

BETA (programming language)

10.1051/epjconf/201714610005

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Variety of Band Structures in Light Sn, In, and Cd Nuclei

AcPPB (2003)

M. Wolińska-Cichocka J. Kownacki E. Ruchowska

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