TY - JOUR

T1 - High-performance algorithm for calculating non-spurious spin- and parity-dependent nuclear level densities

AU - Sen'kov, R. A.

AU - Horoi, M.

AU - Zelevinsky, V. G.

N1 - Funding Information:
R.S. and M.H. would like to acknowledge the DOE UNEDF grant No. DE-FC02-09ER41584 for support. M.H. and V.Z. acknowledge support from the NSF grants No. PHY-0758099 and PHY-1068217 .

PY - 2011/8/26

Y1 - 2011/8/26

N2 - A new high-performance algorithm for calculating the spin- and parity-dependent shell model nuclear level densities using methods of statistical spectroscopy in the proton-neutron formalism was recently proposed. When used in valence spaces that cover more than one major harmonic oscillator shell, this algorithm mixes the genuine intrinsic states with spurious center-of-mass excitations. In this Letter we present an advanced algorithm, based on the recently proposed statistical moments method, that eliminates the spurious states. Results for unnatural parity states of several sd-shell nuclei are presented and compared with those of exact shell model calculations and experimental data.

AB - A new high-performance algorithm for calculating the spin- and parity-dependent shell model nuclear level densities using methods of statistical spectroscopy in the proton-neutron formalism was recently proposed. When used in valence spaces that cover more than one major harmonic oscillator shell, this algorithm mixes the genuine intrinsic states with spurious center-of-mass excitations. In this Letter we present an advanced algorithm, based on the recently proposed statistical moments method, that eliminates the spurious states. Results for unnatural parity states of several sd-shell nuclei are presented and compared with those of exact shell model calculations and experimental data.

KW - Center-of-mass motion

KW - Level density

KW - Moments method

KW - Spurious states

KW - Statistical spectroscopy

UR - http://www.scopus.com/inward/record.url?scp=80051570982&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2011.07.004

DO - 10.1016/j.physletb.2011.07.004

M3 - Article

AN - SCOPUS:80051570982

SN - 0370-2693

VL - 702

SP - 413

EP - 418

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 5

ER -