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Shell model Monte Carlo methods for ...

Fang, Lei.

Shell model Monte Carlo methods for nuclei at finite temperature.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Shell model Monte Carlo methods for nuclei at finite temperature.
作者:	Fang, Lei.
面頁冊數:	137 p.
附註:	Director: Yoram Alhassid.
附註:	Source: Dissertation Abstracts International, Volume: 66-11, Section: B, page: 6043.
Contained By:	Dissertation Abstracts International66-11B.
標題:	Physics, Nuclear.
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3194651
ISBN:	9780542394171

Shell model Monte Carlo methods for nuclei at finite temperature.
Fang, Lei.

Shell model Monte Carlo methods for nuclei at finite temperature. - 137 p.

Director: Yoram Alhassid.

Thesis (Ph.D.)--Yale University, 2005.

Rare-earth nuclei present a challenge to SMMC because of the large size of their model space. A stabilization method at fixed number of particles is used to carry out the calculations at low temperatures. We present results for a mid-shell rare-earth nucleus, 162Dy, and compare with experimental data.

ISBN: 9780542394171Subjects--Topical Terms:

227654
Physics, Nuclear.

Shell model Monte Carlo methods for nuclei at finite temperature.
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245 1 0 $a Shell model Monte Carlo methods for nuclei at finite temperature.
300 $a 137 p.
500 $a Director: Yoram Alhassid.
500 $a Source: Dissertation Abstracts International, Volume: 66-11, Section: B, page: 6043.
502 $a Thesis (Ph.D.)--Yale University, 2005.
520 # $a Rare-earth nuclei present a challenge to SMMC because of the large size of their model space. A stabilization method at fixed number of particles is used to carry out the calculations at low temperatures. We present results for a mid-shell rare-earth nucleus, 162Dy, and compare with experimental data.
520 # $a The finite temperature moment of inertia determines the spin distribution of nuclear levels at not too low temperatures. We propose a simple pairing model for calculating this nuclear moment of inertia. The results of the model are compared to the SMMC results for nuclei in the iron region. Strong odd-even effects observed in the SMMC moment of inertia are well reproduced by the model using a number-parity projection.
520 # $a The shell model Monte Carlo (SMMC) approach enables calculations in much larger shell model spaces than conventional methods can treat. However, its applicability when truncated to one major shell is limited to temperatures below &sim; 1.5--2 MeV. We develop an extension of the shell model theory to higher temperatures by including the effects of the full space via an independent-particle model. We show that the back-shifted Bethe formula for the many-particle level density is valid to higher temperatures T &sim; 4 MeV. We also apply this extended shell model theory to spin-projected observables, and in particular to level densities and heat capacities. The spin-projected heat capacities in even-even nuclei show a signature of the pairing transition for small even values of total angular momentum. This signature disappears rapidly as the angular momentum increases.
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