First Circular                                        

Ref.: International School on Nuclear Physics; 18th Course:
      "4 pi High-resolution Gamma Ray Spectroscopy" 
      in Erice/Trapani/Sicily/Italy; September 16 - 24, 1996

Dear Colleagues,

I want to devote the next international school on nuclear physics in
Erice to the topic "4 pi High-resolution Gamma Ray Spectroscopy". It
seems to me a very timely subject for the Erice School on Nuclear
Physics in 1996. I am sending you a preliminary program of the school
and the first questionaire. If you have colleagues or collaborators
who are interested to participate in the school, please, just copy
the first questionnaire and give it to them.

I naturally hope that you can participate. Please, indicate on the
first questionnaire if you want to have further information, or if
you already know that you are participating or if you even want to
give a seminar. 

The fee for food and lodging for the time from September 16th till
September 24th is 1260 Swissfrancs. The European Physical Society
makes a few fellowships available, which go mostly to young
scientists form Eastern European countries. To receive such a
fellowship you must apply before February 1st, 1996, to:

      Dr. Thomas, European Physical Society
      Petit Lancy, P.O. Box 69, Switzerland. 

Please, send also a copy of this application to me.

Applicants are urged to contact us via e-mail to:


Those who receive this Circular by regular mail can obtain  an e-mail
version of the questionnaire in order to speed up the processing of
your application. Invited lecturers should also return the 
questionnaire. Only in case you have no e-mail facility, please
fill in the enclosed questionnaire and send it to:

                 Prof. Dr. Karl W. Schmid
                 Institut fuer Theoretische Physik
                 Auf der Morgenstelle 14
                 D-72076 Tuebingen

With best regards,
sincerely yours

Amand Faessler
Director of the International School
on Nuclear Physics in Erice

Encl.: Copy of the preliminary program 
       First questionnaire



                           18th Course:


           Erice/Trapani/Sicily: September 16th - 24th, 1996

                International Advisory Committee

A. Arima, RIKEN, Saitama, Japan
J. Eberth, University of Koeln, Koeln
B. Herskind, University of Kopenhagen, Kopenhagen
E. Migneco, Laboratorio di Fisica Nucleare, Catania
F. Stephens, Lawrence Radiation Laboratory, Berkeley
A. van der Woude, University of Groningen, Groningen
A. A. Zichichi, CERN, Geneva

             Preliminary list of lecturers and topics 

1.   S. Baktash, Oak Ridge National Laboratory
     "Clover Detector Array."

2.   P. von Brentano, Universitaet Koeln
     "Deformed Bands in the Xe-Ba Region."

3.   R. Broglia, Universita di Milano
     "Physics with EUROBALL."

4.   H. Grawe, Hahn-Meitner-Institut Berlin
     "High Spin Spectroscopy."

5.   B. Haas, CNRS Strasbourg
     "Gamma Spectroscopy with EUROGAM."

6.   J. Hamilton, Vanderbilt University, Nashville
     "Nuclei far from Stability, Shape Isomeres and a New Fission Mode."

7.   R. Janssens, Argonne National Laboratory, Argonne
     "New High Efficiency Ge-Detectors."

8.   I. Yang Lee, Lawrence Laboratory, Berkeley
     "The Gamma Sphere."

9.   W. Nazarewicz, Oak Ridge National Laboratory
     "Description of High Spin States."

10.  P. Paul, State University of New York, Stony Brook
     "Giant Multipole Resonances."

11.  C. Rossi Alvarez, Laboratorio di Fisica Nucleare, Legnaro
     "From GASP to EUROBALL."

12.  J. Sharpey-Schafer, Uiversity of Liverpool
     "Octupole Excitations in Super-deformed Bands."

13.  D. Schwalm, Max-Planck-Institut, Heidelberg 
     "Excitations in the Second Minimum in Actinide Nuclei."

                         The School

The Erice International School on Nuclear Physics has been founded
by Prof. H. Schopper in 1974. After him it was organized by Sir Denis
Wilkinson till 1983. From the beginning the topics of the school were
chosen to be young and fast expanding fields in the area of the interphase
between nuclear, particle and sometimes also astrophysics. The idea is
to bring internationally highly recognized experts in the field together
with young scientists and even Ph. D. students. In the morning the experts
give review lectures on the newest status of a special topic,
while the afternoon is mainly devoted to seminars of the participants
leaving enough time for discussions and special topic workshops.

                   Motivation of the Topic

Gamma-ray spectroscopy is one of the two main ways of obtaining
information about the nucleus. To characterize an excited state of
a nucleus one has to know at least its excitation energy and its
angular momentum. For that one needs experimental set ups which
can measure the de-excitation gamma-rays in coincidence with a
good energy resolution. This can be done with 4 pi high
resolution gamma-ray detectors of fine granularity. Recently such
detectors have been built and some of them (EUROGAM and GASP) are
already in use. Even more powerful 4 pi gamma-ray spectrometers
are under construction and partially already operating like
EUROBALL and GAMMASPHERE. Such detectors allow to study in details 
the high spin excitations of nuclei with normal and super-deformation. 
It might be that this new detectors even allow to find the hyper-deformed
nuclei with the axis ratio of 3 : 1 which have been predicted

                    Purpose of the Course

Gamma-ray spectroscopy and nuclear reactions are the main
information about the structure of nuclei. On line gamma-
spectroscopy after heavy-ion fusion reactions has already been
performed in the 60ies and had a high point in the 70ies, when
the backbending phenomenon was investigated. Superdeformed nuclei
with the axis ratio of 2 : 1 have already been found as fission
isomeres in the 60ies. At the beginning of the 70ies the group of
Specht and coworkers at Heidelberg did the first investigations of
transitions in the second minimum with this super-deformation. But
it was only in 1986 that in Daresbury super-deformed rotational
bands at high spin states, which were already predicted
theoretically in the 70ies have been found experimentally. This
together with new greatly improved experimental techniques of 4 pi
gamma-ray counters revolutionized the field. The TESSA
detectors at Daresbury with which the super-deformed bands were
found was the first Compton detector which
covered almost the whole sphere. Only this new technology allowed
to see the only very weekly populated super-deformed bands.
GAMMASPHERE and EUROBALL belong to a new generation of 4 pi
gamma-ray detectors. The 18th International School on Nuclear
Physics in Erice will be devoted to the physics which can be done
with such instruments:

a. High spin studies: The available high resolving power
   will make it possible to obtain detailed inside in changing
   intrinsic structure of the nuclei with increasing Coriolis and
   centrifugal forces.

b. Phase transitions: A complete spectroscopy in the
   region up to an excitation energy of several MeV should show
   possible phase transitions between superfluid to normal Fermi
   liquid and phase transitions involving different shapes of nuclei.

c. New isotopes, new decay modes, new regions of
   deformations and limits of stability: The information which one
   can obtain with such studies is also important for nuclear
   astrophysics studying the development of stars, nuclear
   synthesis and supernova explosions.

d. Subnucleonic degrees of freedom: Relativistic effects
   in nuclear structure, meson exchange and the role of quark degrees
   of freedom show up in the violation of sum rules. Complete
   measurements of transition probabilities and excitation energies
   give the information about violation of such sum rules.

e. Test of nuclear models and dynamical symmetries:
   Measurements of a large number of low-energy excited states and
   transition probabilities are testing different nuclear models.

f. Structure of hot nuclei: Studies of giant resonances
   will test the structure of nuclei produced in heavy-ion collisions
   with high temperatures. One of the question in the questions
   investigated there is the role played by chaos in these quantal

* Director of the School: Prof. Dr. Amand Faessler            *
*                 Phone: ++/7071/296370, Fax: ++/7071/296400  *
* Organizers: Prof. Dr. Karl W. Schmid, phone ++/7071/296371  *
*             Dr. Fedor Simkovic, phone ++/7071/296785        *
* Institute for Theoretical Physics, University of Tuebingen, *
* Auf der Morgenstelle 14, D-72076 Tuebingen, Germany         *

Please, fill in the questionnaire below (invited lecturers should also
do this), cut the file here and send its lower part to:


The items "age, F/M" are necessary for room distribution. Senior
participants are usually accomodated in single rooms.

========================== cut here =======================================

     International School on Nuclear Physics, 18th Course:
         "4 pi High-resolution Gamma Ray Spectroscopy" 
         Erice, Sicily, Italy, September 16 -- 24, 1996


                   First Questionnaire

 1. Family name, Title:

 2. Given name:
    Age:         F/M (female/male)

 3. Institution:

 4. Street:

 5. Town, Zip Code:

 6. Country:

 7. E-mail (preferably internet):

 8. Phone:

 9. I want to receive further information   Yes/No

10. I want to participate in the school     Yes/No

11. I want to give a seminar talk           Yes/No

12. Title of your seminar or invited lecture:

13. Recent research interests close to the subjects of the school: 

Letter to the organizers (optional; use below as much space as you need):