Level density and thermodynamic properties of dysprosium isotopes

被引：32

作者：

Nyhus, H. T. ^{[1
]}

Siem, S. ^{[1
]}

Guttormsen, M. ^{[1
]}

Larsen, A. C. ^{[1
]}

Burger, A. ^{[1
]}

Syed, N. U. H. ^{[1
]}

Toft, H. K. ^{[1
]}

Tveten, G. M. ^{[1
]}

Voinov, A. ^{[2
]}

机构：

[1] Univ Oslo, Dept Phys, N-0316 Oslo, Norway

[2] Ohio Univ, Dept Phys & Astron, Athens, OH 45701 USA

来源：

PHYSICAL REVIEW C | 2012年 / 85卷 / 01期

关键词：

STRENGTH FUNCTION; GAMMA;

D O I：

10.1103/PhysRevC.85.014323

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

Dy-163,Dy-164 nuclei have been measured by use of the Oslo method on data from pick-up (He-3, alpha) and inelastic scattering (He-3, He-3') reactions, respectively. The level densities for these dysprosium isotopes together with previously measured Dy160-162 are extracted in the region below the neutron binding energy. Thermodynamic properties are deduced within both micro-canonical and canonical ensemble theories. A phase transition from the pair-correlated state at low energies to a less correlated or uncorrelated state is studied in both ensembles. It is investigated whether the temperature of the nucleus is constant or a varying function of excitation energy. It is found that above an excitation energy of 3 MeV the temperature of all five dysprosium nuclei have a constant value within the experimental uncertainties. The impact of a constant-temperature level density versus a Fermi gas level density is discussed with respect to the canonical heat capacity.

引用

页数：10

共 26 条

[1] The 1995 update to the atomic mass evaluation [J].