B. G. Carlsson

Lund University

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I. Ragnarsson

Lund University

D. Rudolph

Lund University

J. Dobaczewski

University of York

SÅ

Sven Åberg

Lund University

D. Ward

Lund University

C. Fahlander

Lund University

ΝT

Ν. Trautmann

Johannes Gutenberg University Mainz

I. Kojouharov

GSI Helmholtz Centre for Heavy Ion Research

P. Papadakis

Daresbury Laboratory

D. M. Cox

University of Jyväskylä

Cooperative Institutions

GSI Helmholtz Centre for Heavy Ion Research

University of Jyväskylä

Lund University

University of Liverpool

Johannes Gutenberg University Mainz

Centre National de la Recherche Scientifique

Institut National de Physique Nucléaire et de Physique des Particules

University of Warsaw

Helmholtz Institute Mainz

Lawrence Berkeley National Laboratory

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Giant monopole resonances and nuclear incompressibilities studied for the zero-range and separable pairing interactions

Physical Review C (2012)

P. Veselý J. Toivanen B. G. Carlsson J. Dobaczewski N. Michel

Background: Following the 2007 precise measurements of monopole strengths in tin isotopes, there has been a continuous theoretical effort to obtain a precise description of the experimental results. Up to now, there is no satisfactory explanation of why the tin nuclei appear to be significantly softer than ${}^{208}$Pb.Purpose: We determine the influence of finite-range and separable pairing interactions on monopole strength functions in semimagic nuclei.Methods: We employ self-consistently the quasiparticle random phase approximation on top of spherical Hartree-Fock-Bogoliubov solutions. We use the Arnoldi method to solve the linear-response problem with pairing.Results: We found that the difference between centroids of giant monopole resonances measured in lead and tin (about 1 MeV) always turns out to be overestimated by about 100$%$. We also found that the volume incompressibility, obtained by adjusting the liquid-drop expression to microscopic results, is significantly larger than the infinite-matter incompressibility.Conclusions: The zero-range and separable pairing forces cannot induce modifications of monopole strength functions in tin to match experimental data.

Isotopes of tin

Random phase approximation

10.1103/physrevc.86.024303

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Citations (45)

Can a Chiral System Be Built on a Strongly Asymmetric Nucleon Configuration?

Acta Physica Polonica B (2013)

O. Shirinda E. A. Lawrie B. G. Carlsson

A brief outlook on low-energy nuclear physics is presented.Selected recent developments in nuclear structure theory are highlighted and a few open questions are discussed.

10.5506/aphyspolb.44.341

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Citations (1)

Super-short fission mode in fermium isotopes

Physical review. C (2021)

M. Albertsson B. G. Carlsson T. Døssing P. Möller J. Randrup

The so-called super-short fission mode, in which a nucleus divides nearly symmetrically into two unusually energetic fragments, competes favorably with the standard asymmetric fission mode for spontaneous fission of a limited number of nuclei near $^{264}\mathrm{Fm}$ but it quickly fades away at finite excitations. We investigate the energy-dependent competition between those two fission modes for even fermium isotopes from $^{254}\mathrm{Fm}$ to $^{268}\mathrm{Fm}$, using the Metropolis method to simulate the strongly damped fission dynamics being driven by shape- and energy-dependent level densities. The origin of the super-short mode is discussed and its effects on the fragment mass distribution, the total fragment kinetic energy, and the neutron multiplicity are calculated. Generally good agreement with the available data is obtained.

Multiplicity (mathematics)

Cold fission

Spontaneous fission

10.1103/physrevc.104.064616

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Citations (9)

Solution of the Skyrme–Hartree–Fock–Bogolyubov equations in the Cartesian deformed harmonic-oscillator basis.

Computer Physics Communications (2009)

J. Dobaczewski W. Satuła B. G. Carlsson J. Engel P. Olbratowski

Fortran

Bohr model

10.1016/j.cpc.2009.08.009

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Citations (95)

Alpha-particle formation and decay rates from Skyrme–HFB wave functions

Physica Scripta (2014)

D. Ward B. G. Carlsson Sven Åberg

α decay is treated microscopically, where the unstable mother nucleus and residual daughter nucleus are described using HFB wave functions, obtained with the Skyrme effective interaction.From these wave functions the amplitude for forming α particles in the mother nucleus is computed.Two different Skyrme parametrizations with different pairing properties are compared, and we find good agreement with experiment for relative decay rates in both cases.The absolute values of the decay rates are under-estimated.

Alpha decay

10.1088/0031-8949/89/5/054027

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Citations (6)

Calculations of nuclear masses at finite angular momenta

Physica Scripta (2006)

B. G. Carlsson I. Ragnarsson

The macroscopic–microscopic method to calculate nuclear masses is extended into the high-spin regime in order to calculate the nuclear binding energy as a function of proton number, neutron number and angular momentum. We describe the method and exemplify it on recent experimental data.

Nuclear data

Mass number

Nuclear Structure

10.1088/0031-8949/2006/t125/030

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Citations (2)

Neutral-current supernova-neutrino cross sections for Pb204,206,208 calculated by Skyrme quasiparticle random-phase approximation

Physical review. C (2019)

W. Almosly B. G. Carlsson J. Suhonen E. Ydrefors

The present work constitutes a detailed study of neutral-current (NC) supernova-neutrino scattering off the stable even-even lead isotopes $^{204,206,208}\mathrm{Pb}$. This is a continuation of our previous work [Almosly et al., Phys. Rev. C. 94, 044614 (2016)] where we investigated charged-current processes on the same nuclei. As in the previous work, we have adopted the quasiparticle random-phase approximation (QRPA) as the theory framework and use three different Skyrme interactions to build the involved nuclear wave functions. We test the Skyrme forces by computing the location of the lowest-order isovector spin-multipole giant resonances and comparing with earlier calculations. We have computed the NC cross sections for (anti)neutrino energies up to 100 MeV and estimated the nuclear responses to supernova (anti)neutrinos by folding the obtained cross sections by suitably parametrized Fermi-Dirac distributions of energies of the incoming (anti)neutrinos. We compare our results with results of earlier studies in the case of $^{208}\mathrm{Pb}$, which is the only lead isotope where earlier calculations are available.

Random phase approximation

Isovector

10.1103/physrevc.99.055801

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Citations (9)

Low-lying states in Ra219 and Rn215 : Sampling microsecond α -decaying…

Physical review. C (2018)

A. Såmark-Roth L. G. Sarmiento D. Rudolph Johan Ljungberg B. G. Carlsson

Short-lived α-decaying nuclei "northeast" of 208Pb in the chart of nuclides were studied using the reaction 48Ca+243Am with the decay station TASISpec at TASCA, GSI Darmstadt. Decay energies and times from pile-up events were extracted with a tailor-made pulse-shape analysis routine and specific α-decay chains were identified in a correlation analysis. Decay chains starting with the even-even 220Ra and its odd-A neighbors, 219Fr, and 221,219Ra, with a focus on the 219Ra→215Rn decay, were studied by means of α−γ spectroscopy. A revised α-decay scheme of 219Ra is proposed, including a new decay branch from a previously not considered isomeric state at 17 keV excitation energy. Conclusions on nuclear structure are drawn from the experimental data, aided by Geant4 simulations and a discussion on theoretical calculations.1 MoreReceived 8 June 2018Revised 2 July 2018DOI:https://doi.org/10.1103/PhysRevC.98.044307©2018 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasAlpha decayLifetimes & widthsNuclear structure & decaysProperties190 ≤ A ≤ 219A ≥ 220TechniquesCollective modelsNuclear density functional theoryShell modelSpectrometers & spectroscopic techniquesNuclear Physics

Nuclide

10.1103/physrevc.98.044307

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Citations (11)

Recoil-α-fission and recoil-α–α-fission events observed in the reaction 48Ca + 243Am

Nuclear Physics A (2016)

U. Forsberg D. Rudolph L.-L. Andersson A. Di Nitto Ch. E. Düllmann

Recoil

Decay chain

Alpha decay

Cold fission

Long-lived fission product

10.1016/j.nuclphysa.2016.04.025

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Citations (56)

Highly deformed band structures due to core excitations in Xe123

Physical review. C (2021)

A. Basu A. K. Singh I. Ragnarsson B. G. Carlsson A. Kardan

High-spin states in $^{123}\mathrm{Xe}$ were populated in the $^{80}\mathrm{Se}(^{48}\mathrm{Ca}, 5\mathrm{n})^{123}\mathrm{Xe}$ reaction at a beam energy of 207 MeV. $\ensuremath{\gamma}$-ray coincidence events were recorded with the Gammasphere spectrometer. Four new high-spin bands have been discovered in this nucleus. The bands are compared with those calculated within the framework of cranked Nilsson-Strutinsky and cranked Nilsson-Strutinsky-Bogoliubov models. It is concluded that the configurations of the bands involve two-proton excitations across the $Z=50$ as well as excitation of neutrons across the $N=82$ shell gaps resulting in a large deformation, ${\ensuremath{\varepsilon}}_{2}\ensuremath{\approx}0.30$ and $\ensuremath{\gamma}\ensuremath{\approx}{5}^{\ensuremath{\circ}}$.

Gammasphere

10.1103/physrevc.103.014301

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Citations (3)