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Shell model Monte Carlo methods for ...

Fang, Lei.

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Shell model Monte Carlo methods for nuclei at finite temperature.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Shell model Monte Carlo methods for nuclei at finite temperature./
Author:	Fang, Lei.
Description:	137 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-11, Section: B, page: 6043.
Contained By:	Dissertation Abstracts International66-11B.
Subject:	Physics, Nuclear. -
Online resource:	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.

Source: Dissertation Abstracts International, Volume: 66-11, Section: B, page: 6043.

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

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.

ISBN: 9780542394171Subjects--Topical Terms:

1019065
Physics, Nuclear.

Shell model Monte Carlo methods for nuclei at finite temperature.
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100 1 $a Fang, Lei. $3 1291953
245 1 0 $a Shell model Monte Carlo methods for nuclei at finite temperature.
300 $a 137 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-11, Section: B, page: 6043.
500 $a Director: Yoram Alhassid.
502 $a Thesis (Ph.D.)--Yale University, 2005.
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.
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 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.
590 $a School code: 0265.
650 4 $a Physics, Nuclear. $3 1019065
690 $a 0610
710 2 0 $a Yale University. $3 515640
773 0 $t Dissertation Abstracts International $g 66-11B.
790 1 0 $a Alhassid, Yoram, $e advisor
790 $a 0265
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3194651