13 research outputs found
Temperature and Scaling Studies from Projectile Fragmentation of 86,78Kr+64,58Ni at 35 MeV/A.
Many observables have been developed to study the effects of the two component
nature of nuclei. This dissertation has experimentally probed caloric curves as well
as scaling observables for their dependence on the asymmetric portion of the nuclear
equation of state. Projectile fragmentation sources were identified from the reactions
of 86,78Kr+64,58Ni at 35 MeV/A taken on the NIMROD-ISiS array. The angular
coverage, excellent isotopic resolution, and Neutron Ball allow for quasi-complete
event reconstruction in both charge and mass.
A new thermometer for nuclear fragmentation studies has been derived and is
presented here. In this thermometer, the temperature is obtained from fluctuations of
the transverse momentum. The proton transverse momentum fluctuations are used
in this thesis to study the N/Z dependence of the nuclear caloric curve. The caloric
curve constructed from proton momentum fluctuations does not show a significant
dependence on the source N/Z ratio. Two other thermometers have also been studied
in this thesis: the double isotope ratio, and moving source slope thermometers. These
thermometers show no statistically significant dependence on the source N/Z.
The source density has been derived from the evolution of fragment Coulomb
barriers with increasing E*/A. This density showed no source N/Z dependence. However,
a strong evolution in source density over the E*/A=1.5-7.5 MeV region was
observed.
Fragment scaling was investigated through isoscaling and power law scaling. The power law scaling showed a strong dependence on the source N/Z. This source N/Z
dependence was further investigated through isoscaling. The fragment yields of this
data have been shown to exhibit consistent isoscaling for Z=1-17. In addition, isoscaling
was observed in data cut on the E*/A of the source yielding decreasing slopes (a)
as a function of E*/A. This decrease, normalized to the asymmetries of the sources
(a/delta), has been linked to a decrease in the asymmetry coefficient Csym.
This dissertation has shown that the experimentally observed decrease in Csym
with E*/A is well correlated to the temperature and density changes experimentally
observed in this data
Using Light Charged Particles to Probe the Asymmetry Dependence of the Nuclear Caloric Curve
Recently, we observed a clear dependence of the nuclear caloric curve on
neutron-proton asymmetry through examination of fully
reconstructed equilibrated quasi-projectile sources produced in heavy ion
collisions at E/A = 35 MeV. In the present work, we extend our analysis using
multiple light charged particle probes of the temperature. Temperatures are
extracted with five distinct probes using a kinetic thermometer approach.
Additionally, temperatures are extracted using two probes within a chemical
thermometer approach (Albergo method). All seven measurements show a
significant linear dependence of the source temperature on the source
asymmetry. For the kinetic thermometer, the strength of the asymmetry
dependence varies with the probe particle species in a way which is consistent
with an average emission-time ordering.Comment: 7 pages, 4 figure
The Grizzly, March 25, 1983
New Editors Elected: Romer, Hong, Pasekoff Named • Superstars Tournament Needs Participants • DuPont Gives Third Consecutive Chemistry Grant • The A\u27s Come to UC • Third Annual Special Olympics This Weekend • Summer in Japan • Folk Singers at Bomberger • Letters to the Editor: An Epilogue to Zeta Chi • USGA Holds Election • USGA Notes • Voight at Bat • 13 Spend Break in Quebec • To Hell With the USFL • College Bowl Goes to Maryland • 1983 Room Selection Procedure • Bear\u27s Den Replaces Cafe International • Cycling Marathon: Ride for Your Life • Men\u27s Lacrosse Slow Getting Started • Men\u27s and Women\u27s Track Win Openershttps://digitalcommons.ursinus.edu/grizzlynews/1097/thumbnail.jp
The Grizzly, April 15, 1983
Second Attack: Improvements Sought for Security • New Senior Fund • Seminar Planned • The A\u27s Come to Helfferich Hall • Letter to the Editor: Most Abominable Act • Faculty Promotions Approved • President\u27s Corner • Sexual Assault in Quad • Security Tips • Nuclear Freeze Concert • Ursinus Representatives at UN • Ice Cream Night at Bear\u27s Den • Final Exam Schedule • Republicans for Rock! • Escape From Ursinus • Bear Batsmen Drop Slugfest • Men\u27s Track Evens Up • Men\u27s Tennis Nets Two Wins • Girls\u27 Nets Optimistic • Men\u27s Lacrosse Victorioushttps://digitalcommons.ursinus.edu/grizzlynews/1098/thumbnail.jp
The Grizzly, March 4, 1983
Zeta Chi Suspended: Fraternity Disciplined for Pledging Violations • Symposium Topics Discussed • New Forum Committee to Revise System • Letters to the Editor: Alumnus Responds to Grizzly Policy • Committee Reviews Appeals Procedure • Meistersingers Tour • Exam Schedule • Woodcuts at Myrin • Stravinsky Program Ends Winterfest • Lantern Deadline Approaches • Lewis on Wall Street • Alpha Sigma Nu Tops GPAs • Roving Reporter: The Administration is Proposing to put a Live-in Dean in 97 of New Men\u27s Dorm • Pre-Legal Society Resurrected • Swimmers Perform Beyond Expectation • Bear Blades Blaze to Victory • Gymnasts Draw No. 2 Ratinghttps://digitalcommons.ursinus.edu/grizzlynews/1096/thumbnail.jp
The Grizzly, September 30, 1983
Fraternities Speak Out • Media Meeting Held • Forum Series Begins • President\u27s Corner • Letters to the Editor • Student Profile: Weible on Wheels • Guitarist Plays at Ursinus • Faculty Lectures Open • Everybody\u27s Rockin\u27 • Accountants Sponsor Competition • Parsons Stars in Video • Volleyball Picks up First Win • Gone But Not Forgotten • Speech Exemption Exam to be Given • Soccer Team Seeks to Regroup for Divisional Play • Hockey Lookin\u27 Good • Bear Pack up for Strong Season • Western Maryland Bombs Bearshttps://digitalcommons.ursinus.edu/grizzlynews/1102/thumbnail.jp
The Grizzly, April 29, 1983
Three Administrators to Leave: Harris, Layne Retire • Ursinus Makes Inquirer Headlines • Housing Shortage is Imminent • J-Board Changes to be Made • Ursinus Students Win German Awards • Computer Genius is Honored at Myrin • Renninger to go to Scotland • Ursinus Professor Sees Work Published • President\u27s Corner • Letters to the Editor • Bike-A-Thon Proves Successful • Film Reveals Nuclear Horror • Zacharias Ursinus to be Honored in Fall • Award Time • College Choir Turns Comic • Holocaust Survivor Speaks at Commemoration • Women\u27s Tennis Overcomes Adversities; Wins MAC Play-off Berth • Bears\u27 Softball Team Reaches Goal • Women\u27s Lacrosse Turns in Another Strong Season • Ursinus Sluggers Gear Up for Home Stretch • Sports Profile: The Mile Relay Team • Track Teams Close Out Seasons • Men\u27s Tennis Concludes Successful Campaign • Men\u27s Lacrosse Suffers Two Defeatshttps://digitalcommons.ursinus.edu/grizzlynews/1100/thumbnail.jp
The Grizzly, February 4, 1983
Trouble at Cutillo\u27s: Frats Earn Reputation as Animals • Drinking Concerns Richter • Economics Council Sponsors Entrepreneur-Related Forum • President\u27s Corner • Wismer Tries Again • Pfacelift at Pfahler • Bear Blades Burnished Beat Wilmington Twice • Serendipity Celebration Features Films • Writing Center Welcomes Students • Who\u27s Who in Who\u27s Who? • Commentary: Speak Up for Coed Housing • Didja Ever Wonder • Wrestlers Earn Split • Lewis on Wall Street • Disruptive Fans Cause Flare-up at Widener • Top Individual Efforts Mark Gymnastics Team • Interview: Chupein Named to All-League Team • Lady Hoops Still Struggling • Men\u27s Basketball Find Road a Bit Bumpy • Swimmers Maul Terrors of Western Marylandhttps://digitalcommons.ursinus.edu/grizzlynews/1092/thumbnail.jp
PCA-based lung motion model
Organ motion induced by respiration may cause clinically significant
targeting errors and greatly degrade the effectiveness of conformal
radiotherapy. It is therefore crucial to be able to model respiratory motion
accurately. A recently proposed lung motion model based on principal component
analysis (PCA) has been shown to be promising on a few patients. However, there
is still a need to understand the underlying reason why it works. In this
paper, we present a much deeper and detailed analysis of the PCA-based lung
motion model. We provide the theoretical justification of the effectiveness of
PCA in modeling lung motion. We also prove that under certain conditions, the
PCA motion model is equivalent to 5D motion model, which is based on physiology
and anatomy of the lung. The modeling power of PCA model was tested on clinical
data and the average 3D error was found to be below 1 mm.Comment: 4 pages, 1 figure. submitted to International Conference on the use
of Computers in Radiation Therapy 201
The Lantern Vol. 50, No. 2, Spring 1984
• The Storm • Je ne sais pas • The Ghetious Blastious • An Empty Cradle • The Playing Hands • Battle Hymn • A Limerick • Parting Thoughts • The River • Miss You • De la Tristeza • Two So Special • Time of the Unicorn • The Absence • Thru The Breeze • Is the World Really a Round Ball? • Brother • To Michael • Gravity • Refuge • Der Witwer • Plastic Flowers Never Die • Book on the Shelfhttps://digitalcommons.ursinus.edu/lantern/1124/thumbnail.jp