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U.S. Department of Justice
Bureau of Alcohol, Tobacco, Firearms and Explosives
ATF EXPLOSIVES Industry Newsletter
Published Bi-Annually
What's in this Issue
Carson W. Carroll, Assistant
Carson W. Carroll, Assistant Director, Enforcement
Director, Enforcement
Programs and Services, Retires2009 Institute of Makers of Explosives (IME) Spring
Programs and Services,
2010 International Society of Explosives
Engineers (ISEE) ConferenceType-1 Igloo or "Army-type Structure" Explosives
MagazinesDay Boxes
A fter more than 22 years of Government service,
Carson W. Carroll, the Assistant Director for Enforcement Programs and Services, retired
on August 31, 2009. As Assistant Director, Mr. Carroll
Table of Distances and Barricades
directed the development of policy guidance and oversaw
Recording Explosive Materials "Used"
programs supporting ATF's explosives related mission
Inspection Violations
Black Powder Blanks
Mr. Carroll joined the Bureau as a Criminal Investigator
Deteriorated Explosives
in 1987. During his career with ATF, he served as a
U.S. Department of Defense Exemption Application
Special Response Team Leader in the Los Angeles Field
Division, the Special Agent in Charge for the Tactical
Storage of Exempt Explosive Materials in Magazines
Response Branch and Critical Incident Management
Branch, and the Special Agent in Charge for the Seattle
Orange Book Errata
Field Division. Mr. Carroll became Chief of the Arson and Explosives Programs Division in 2002 before his
appointment as Deputy Assistant Director for the Office of Field Operations in 2005. In June 2008, Carson W. Carroll was appointed Assistant Director for the Office
Arson & Explosives Programs Division (AEPD)
of Enforcement Programs and Services.
Joseph M. Riehl
During his tenure with ATF, Carson worked hard to
Deputy Division Chief
Gregory D. Plott
ensure that ATF fairly and consistently enforced the regu-
Explosives Industry Programs Branch (EIPB)
lations, sought to increase public safety, and provided
guidance to the industry whenever possible. Carson's knowledge and experience will be missed, and we thank
Explosives Technology Branch
Branch Chief
Kenneth C. Coffey
him for his hard work and dedication to ATF.
Arson and Explosives Enforcement Branch (AEEB)
Branch Chief
Gilbert C. Bartosh
2009 IME Spring Meeting
Visit ATF on the Web!
Working for a Sound and
A rson and Explosives Programs Division (AEPD)
Chief, Joe Riehl, EIPB Chief Deb Satkowiak, and Industry Liaison Bill O'Brien participated in the
Institute of Makers of Explosives (IME) Spring Meeting
held in LaJolla, CA in May 2009. IME meetings afford
ATF an opportunity to interact face-to-face with IME's
and floors may be up to 12 inches thick, and the tops of
individual industry members.
these magazines are often covered with up to 2 feet of compacted earth. ATF regulations address this specific
Chris Ronay, IME President, presents an award to Joe
magazine construction and refer to it as an igloo or
Riehl following his presentation to IME members. The
"Army-type structure" in sections 555.207, 555.210 and
award was presented in appreciation of ATF's continued
partnership with IME.
Igloo or Army-type structure magazines must meet all construction, locking, housekeeping and table of distance requirements found in 27 CFR Part 555. Although the DOD rates these magazines for a maximum capacity of 500,000 pounds of explosive materials, ATF regulations at 27 CFR 555.213 allow for a maximum capacity of only 300,000 pounds. Therefore, any licensee or permit-tee storing in excess of the 300,000 pounds must apply for a variance from the regulation.
Further, per section 555.207, masonry wall construc-tion must be at least 6 inches thick and interior walls should be constructed of, or covered with, a nonsparking material. ATF has held in ATF Ruling 75-21 that smooth concrete in DOD magazines is nonsparking and therefore does not need to be painted over or covered with a nonsparking material. However, it is incumbent upon the licensee or permittee to ensure that the magazine meets all Federal construction requirements before storing
2010 Explosives and
Licensees or permittees who purchase or lease an igloo or Army-type structure magazine should be aware that magazines built to older military standards may not meet the security requirements of the current Federal
T he International Society of Explosives Engineers
(ISEE) Explosives and Blasting Regulatory Conference will be co-sponsored by the Bureau
explosives regulations, If a particular Type-1 igloo or
of Alcohol, Tobacco, Firearms and Explosives in
Army-type structure magazine does not meet Federal
Washington, D.C. in July 2010. The ISEE conference is
guidelines, licensees or permittees may request a vari-
held to provide information to individuals responsible
ance from the Explosives Industry Programs Branch
for enforcing or developing laws and regulations govern-
(EIPB), through the local ATF office.
ing explosives and blasting. In addition to updating regulatory bodies on the use of commercial explosives, related industry technology, and safety and security, the
Day Boxes
conference provides a forum for regulators to interact with industry to discuss issues, concerns and common problems.
A TF conducts an annual review of all explosive
materials thefts that have occurred throughout
Type-1 Igloo or "Army-
the nation. Through ATF's evaluation, explosives
type Structure" Explosives
licensees and permittees who were victims of such thefts have indicated that many of these crimes, and their ac-
companying financial loss, could have been avoided by ensuring their adherence to Federal explosives storage
regulations. For example, in 2007, 16 detonators were sto-
he United States Department of Defense (DOD)
len from a day box left unattended overnight in a vehicle.
has sold and/or leased "igloo" style magazines
Federal explosives regulations at 27 CFR 555.203 allow
to numerous Federal explosives licensees and
for the temporary,
attended storage of high explosives
permittees. Many of these igloo style magazines are
in a type 3 magazine, also known as a "day-box". These
constructed using rebar reinforced concrete. The walls
magazines must be fire-resistant, weather-resistant, and
theft-resistant. However, while 27 CFR 555.209 provides
cases offer the same level of protection as a separate
details concerning construction and locking requirements,
barricade. However, Explosives Industry Programs
using a proper lock may only protect a day-box from
Branch (EIPB) will evaluate variance requests to evalu-
unwanted entry. A proper lock will not prevent theft of the
ate earthen-covered magazines as barricaded based on
day-box itself. During inspections, ATF has discovered
specific criteria, to include: (1) overall magazine con-
explosives that were left in unattended day-boxes for days
struction, (2) amount and type of earth covering, (3)
or weeks at a time. Explosive materials may not be stored
class, type, and maximum weight of explosives stored;
unattended in type 3 magazines but must be removed to
and (4) actual distances from inhabited buildings,
type 1 or type 2 magazines for unattended storage. The
highways, passenger railways, and other magazine.
practice of storing explosives in an unattended day-box
ATF also receives inquiries about what constitutes "any
is not only a violation of Federal explosives regulations,
other approved" artificial barricade in the definition
but it also exposes the day-box and the explosives stored
at 27 CFR 555.11. To obtain a determination whether
therein to theft and illegal use.
your current or proposed artificial barricade meets the requirements of the regulations, please forward your
Tables of Distances
specific request and construction of such barricade to EIPB to seek guidance or approval. EIPB may be
and Barricades
contacted at (202) 648-7120, or you may contact your local ATF Field office. Telephone numbers to each ATF Field Office can be found at http://www.atf.gov/contact/field.htm.
T he Federal explosive regulations require explosives
storage magazines to be located certain minimum distances from other magazines, inhabited build-
ings, passenger railways, and public highways based on
Recording Explosive
the quantity of explosive materials stored in each maga-
zine. These tables of distances were adopted to protect the public in the event of a magazine explosion. Individuals have expressed confusion whether the edge or center of the higway should be used to determine compliance with
Federal regulations at 27 CFR 555.123(d) require
licensed manufacturers who manufacture explosive
the table of distances at 27 CFR 555.218.
materials for their own use to enter in a separate
When determining the lawful distance between a
record, not later than the close of the next business
magazine containing high explosives and a highway, an
day following the date of use: (1) the date of use; (2)
individual should measure from the nearest edge of the
the quantity (in applicable quantity units); and (3) a
magazine to the nearest edge of the highway. However,
description of the explosive materials used. This record
this should not be confused with the means to ensure
is separate and distinct from the disposition record
proper barricading of a magazine. When evaluating
requirements for explosive materials under 555.123(c).
whether a magazine is properly barricaded from a
However, licensed manufacturers are exempt from the
highway; an individual must determine that a straight
555.123(d) recordkeeping requirement if the explosive
line, from the top of any sidewall of the magazine to a
materials are manufactured for the licensee's own use
point 12 feet above the center of a highway, will pass
and are used within a 24 hour period at the same site.
through the barricade.
Similarly, regulations at 27 CFR 555.124(c) require
Additionally, ATF frequently receives questions regard-
licensed dealers to record in a separate record any
ing whether earthen-covered magazines are considered
explosive materials used by the dealer, not later than the
barricaded (as receptors) for table of distance purposes.
close of the next business day following the date of use
The regulation at 27 CFR 555.11 defines artificial
by the dealer. This record must include: (1) the date of
barricade as: "An artificial mound or revetted wall of
use; (2) the name or brand name of the manufacturer and
earth of a minimum thickness of three feet, or any other
name of importer (if any); (3) the manufacturer's marks
approved barricade that offers equivalent protection."
of identification; (4) the quantity (in applicable quantity
ATF does not consider earth covering a magazine to
units); and (5) a description of the explosive materials
meet the definition of a barricade. Whether a mound
used. Licensees with questions about their particular
covering a receptor magazine offers a level of protection
recordkeeping requirements should contact their local
equivalent to that of a free-standing barricade likely
depends upon several factors discussed below. ATF is not satisfied that a mound covering a magazine would in all
Black Powder Blanks
The explosives industry's increased emphasis on
improving explosive materials security through
R ecently, ATF received inquiries regarding
whether black powder blanks, and transactions
regulatory compliance and improved internal
involving black powder used in manufac turing
controls has resulted in a decrease in the number of
black powder blanks, are regulated under Federal explo-
explosive materials thefts over the past 5 years. However,
sives laws. Black powder "blanks"—such as blanks used
explosive materials thefts still occur and a cooperative
in cowboy reenactments—are made with black powder
effort is required on the part of ATF and the explosives
instead of smokeless powder to create more realistic
industry to track and recover the explosive materials to
smoke effects. The Federal explosives laws at 18 U.S.C.
prevent their illegal use. While ATF strives to work and
§ 845(a)(5) and the regulations at 27 CFR 555.141(b)
consult with the explosives industry and its associations
state that commercially manufactured black powder (1) in
to ensure the safety and security of the public, secure
quantities that do not exceed fifty pounds, and (2) that is
explosive materials storage and accurate recordkeeping
used solely for sporting, recreational, or cultural purposes
are responsibilities of every Federal explosives licensee
in antique firearms, is exempt from the regulations.
and permittee. An analysis of violations disclosed during
Black powder blanks are designed for use in modern
inspections for the 2009 fiscal year revealed that 50
firearms, typically .45 caliber cartridges, and therefore do
percent of the violations cited were for failure to comply
not qualify for this exemption.
with recordkeeping requirements. Over half of these re-
Under 18 U.S.C. § 845(a)(4), small arms ammunition
cordkeeping violations were cited for failure to properly
and components thereof are exempt from the Chapter
maintain the Daily Summary of Magazine Transaction
40. While black powder alone does not constitute
(DSMT) record. Storage violations accounted for 37
ammunition, black powder blanks used in small arms
percent of the violations cited. Nearly 40 percent of these
are considered small arms ammunition under the Federal
storage violations were cited for improper magazine
explosives laws. Therefore, an ATF license or permit is
construction, and an additional 17 percent were cited
not required to purchase black powder blanks.
for failure to meet housekeeping requirements under 27 CFR 555.215. Please objectively examine your storage
This exemption, however, does not pertain to the
premises and recordkeeping process to ensure you are
purchase of black powder for the purpose of manu-
in compliance with all Federal explosives regulations,
facturing black powder blanks. Therefore, the receipt
and to aid the law enforcement community with tracing
of black powder for the manufacture of black powder
explosive materials recovered after a theft.
ammunition, including the manufacture of black powder blanks, is subject to the regulations of 27 CFR Part 555. Individuals or companies that wish to acquire black
Explosives Violations During
powder to assemble black powder blank cartridges must
possess an ATF explosives license or permit. Any black powder acquired must be stored in accordance with 27 CFR 555 Subpart K.
T he regulations at 27 CFR 555.215 require that,
"when any explosive material has deteriorated it is to be destroyed in accordance with the advice
or instructions of the manufacturer." The term "dete-riorated" in this regulation refers to explosive materials that have become dangerous or unstable by virtue of the deterioration of the explosive materials or the immediate bag, cartridge, shell, or whatever is used to contain the explosive materials. Examples of deteriorated explosive materials include:
• Dynamite that is leaking nitroglycerin or forming salt
Proprietors must properly account for all stored
explosive materials, including those in a deteriorated
• The interior components of a fireworks shell or device
condition and awaiting destruction, in the records of
rendered unstable by moisture or the formation of salt
acquisition and disposition and the daily summary of
magazine transactions. ATF recommends that any pro-prietor storing deteriorated explosive materials package
• A pyrotechnic item whose outer casing has deteriorated
them in cartons or boxes, as appropriate, and note on the
due to moisture or age and no longer has the physical
container the explosive materials contained therein and
characteristics necessary for proper functioning.
the date on which they were placed in the container.
In contrast, a shell or device whose outer casing or lift package is leaking pyrotechnic material due to damage
Keep in mind that the housekeeping regulations at 27
or a manufacturing defect is not considered dangerous if
CFR 555.215 and this interpretation pertain to explosive
properly stored for timely repair in a closed container and
materials in storage under ATF's jurisdiction. State
in such a manner that pyrotechnic material does not leak
and local agencies and other Federal agencies—such
from that container.
as the U.S. Department of Transportation and the Environmental Protection Agency—may have separate
Explosive material that has failed to ignite or detonate,
requirements governing the transportation, storage, and
and is placed in a secure container in a magazine for
destruction of deteriorated explosive materials.
storage until it can be destroyed, repaired, or refurbished, generally is not considered deteriorated unless it is also in
Finally, if the manufacturer of the deteriorated explosive
a dangerous or unstable state. Therefore, a proprietor may
materials is no longer in business, or if a licensee or
place a broken stick of emulsion (or other stable product)
permittee cannot determine the origins of the deterio-
in a closed, non-spark producing container in a magazine
rated explosive materials, contact ATF or other local
until he or she can safely destroy and dispose of it.
authorities. Under no circumstances should a licensee
Similarly, a "dud," defective, or damaged fireworks article
or permittee attempt to destroy deteriorated explosive
that poses no danger, may be stored in a closed container
materials without first contacting the manufacturer or
while awaiting destruction, repair, or refurbishing. In con-
other knowledgeable authorities. ATF also encourages
trast, a detonator that fails to function generally requires
proprietors dealing with deteriorated explosive materi-
expeditious destruction or return to the manufacturer,
als to contact their industry associations for further
and should be stored in a closed, non-spark producing
container only as long as necessary before destroying or returning the detonator to the manufacturer.
U.S. Department of Defense
The Federal regulations do not provide specific time requirements for the destruction of deteriorated explosive
Exemption Application to
materials. In general, a proprietor may take a reason-
able amount of time to make arrangements for either the destruction of deteriorated explosive materials or retrieval of deteriorated explosive materials by a Federal explosives licensee or permittee contracted to dispose of
A TF often receives inquiries regarding the
application of the Federal explosives regula-
deteriorated explosive materials. Please note that some
tions to operations involving the U.S. Depart-
deteriorated explosive materials—such as the dynamite
ment of Defense (DOD). Typically, the questions pertain
described above—may present an extreme safety hazard
to contracts at current or former DOD sites, e.g., demili-
and should be destroyed as soon as possible. Such
tarization of DOD munitions.
hazardous deteriorated explosive materials should only be moved or handled by qualified persons specifically
The regulations at 27 CFR 555.141(a)(3) and 555.141(a)
trained to handle such materials. When storing dete-
(6) contain exemptions for certain explosives operations
riorated explosive materials, the licensee or permittee
as they pertain to U.S. Government agencies, including
proprietor should be prepared to demonstrate to ATF that
DOD components. ATF generally interprets the exemp-
they are taking the appropriate steps to safely remove and
tions to extend to work performed under the scope of
destroy the materials. For example, the proprietor should
DOD contracts, with some exceptions depending upon
be able to show that he or she has contacted a contractor
the nature and scope of the operations. This article will
to properly destroy the deteriorated explosive materials,
explore some examples of activities that may or may not
or specify when the deteriorated explosive materials will
be exempt under ATF regulations.
be destroyed at a blast site, if appropriate.
The U.S. Army Corps of Engineers (USACE) frequently
To ensure that the tables of distances can be properly
provides oversight of the remediation or clean-up of
applied to ATF-regulated materials, regulated com-
sites previously used for the manufacture, storage and
mercial use explosive materials should be segregated
testing of military explosive materials. The USACE often
from unregulated DOD-owned or contracted explosive
contracts with private companies to perform much of the
materials to the greatest extent possible, and the weights
explosives-oriented work in these efforts, e.g., soil reme-
of the commercial explosive materials should be avail-
diation, location and destruction of munitions from a test
able for examination.
range, or removal and destruction of explosive materials
The USACE generally requires as a condition of a
from processing buildings. Generally, work performed
remediation or demilitarization contract that a company
pursuant to such a contract is exempt from ATF regula-
obtain a Federal explosives license or permit from ATF
tion provided that all work performed is on behalf of
even if the contracted operations are exempt from the
the USACE or another DOD component. However, the
regulations at 27 CFR Part 555. It is common practice
company performing the work on behalf of the USACE
for ATF to issue such licenses or permits, provided the
or DOD component may still need a Federal explosives
company qualifies under the provisions found at 27
license or permit for activities performed outside of the
CFR Part 555, Subpart D. The issuance of a Federal
U.S. Government contract.
explosives license or permit in these contract situations
DOD often contracts with companies to perform "de-
does not necessarily affect the exemptions discussed
militarization" operations on certain military munitions,
above. Rather, the specific circumstances surrounding
e.g., disassembling a certain type of exploding missile
each contract situation determine whether a company's
projectile. The contract may require that the company
activities related to DOD remediation or demilitariza-
remove the high explosive materials from each projectile.
tion fall under ATF regulation. Individuals with ques-
The contract may also stipulate that the explosive materi-
tions regarding their specific situations may contact ATF
als must be destroyed or stored for further use by DOD.
Explosives Industry Programs Branch at (202) 648-7120
Since all work in this scenario is performed on behalf
or
[email protected].
of DOD, and ownership of the materials is retained by DOD, the work performed pursuant to the contract would be exempt from ATF regulation.
Storage of Exempt Explosive
In contrast, some contracts may allow the contractor to
Materials in Magazines
retain the extracted explosive materials for their own use, for use in further manufacture, or for sale in commerce. In such a case, ownership of the explosive materials typically passes from DOD to the private company. ATF
A TF recently received inquiries regarding the
storage of exempted explosive materials in the
generally considers this acquisition and any further ac-
same magazine where regulated explosive
tivities involving the explosive materials to be regulated
materials are stored.
by 27 CFR Part 555.
Pursuant to 27 CFR 555.141, ATF exempts certain
Similarly, companies contracting with DOD are
explosive materials that include but are not limited to:
regulated if they also perform separate commercial
consumer fireworks, articles pyrotechnic, and other
operations. For example, a company may contract with
explosive materials under the control of the Federal,
DOD to manufacture certain materials. Additionally,
State and local government agencies, such as the
the company manufactures explosive materials for the
Department of Defense. Each specific exemption listed
commercial market. The regulations at 27 CFR Part 555
at 27 CFR 555.141 identifies not only the exempted
apply to the company's commercial explosive materials
explosive materials, but also the related operations that
activities. Moreover, storage of commercial explosive
are exempt from the Federal explosive regulations. For
materials not for use in conjunction with a DOD contract
example, the importation, distribution, and storage of
is subject to ATF regulation and inspection, even if the
fireworks generally known as consumer fireworks and
explosive materials are stored in the same magazine as,
articles pyrotechnic are exempt from the ATF explosives
and in close proximity to, DOD explosive materials that
regulations. The transportation, shipment, receipt, or
are not regulated by ATF. Explosive materials for use in
importation of explosive materials for delivery to any
conjunction with a DOD contract, when stored with ATF
agency of the United States or to any State or its political
regulated explosive materials, are not included in the
subdivision is exempt. However, State and local entities
total explosive weight within the magazine when deter-
are still required to store their explosive materials in
mining table of distance requirements under Subpart K.
accordance with the Federal explosives regulations.
Generally, when regulated explosive materials are stored in the same magazine with exempt explosive
Orange Book Errata
materials, only the net explosive weight (NEW) of the regulated explosive materials is taken into account when determining compliance with the tables of distances specified in 27 CFR 555.206. For example, an indi-
T he July 2009 printing of ATF Publication 5400.7,
ATF Federal Explosives Law and Regulations
vidual storing display fireworks in the same magazine
(the "Orange Book"), contained several misprints
with exempted consumer fireworks is only required to
concerning the locking requirements found in 27 CFR,
determine the NEW of the regulated display fireworks.
Subpart K, on pages 49 through 52. The misprints affect the locking requirements found at 27 CFR 555.207(a)
Explosive materials exempt from ATF storage regula-
(9), 555.208(a)(4) and (b)(4), 555.209, 555.210(a)(4)
tions are not required to be stored in an ATF approved
and (b)(4), and 555.211(a)(4) and (b)(4). In all instances,
magazine. However, ATF encourages individuals and
the "a inch" shackle diameter requirement was errone-
companies in possession of exempt explosive materials
ously printed as "a-inch." Padlocks must have a case-
to secure them inside an ATF approved magazine to
hardened shackle of at least a″ diameter. We will correct
better ensure their safety and security.
the publication for future distributions. Anyone who has
Further, although there are no regulatory requirements
the misprinted edition should be aware of this error and
to separate regulated and exempted explosive materials
make corrections accordingly.
stored in the same magazine, ATF strongly recommends that exempted explosive materials be segregated and/or clearly marked to ensure no impediment during an
ATF inspection and to provide the best accountability of
regulated explosive materials. Explosive materials that are not exempt from Federal explosives regulations will be factored into the total NEW for a storage magazine. Finally, industry members shall continue to comply with the housekeeping requirements specified at 27 CFR 555.215 and ensure that magazines are kept clean, dry, free of grit, paper, empty packages and containers, and rubbish.
Notice of Errata
T he Explosives Industry Newsletter, June 2009
edition, contained an error in the Change of Control article on page 7. The article stated that
"renewal applications must contain an originally signed EPQ for all current employee possessors and responsible persons, otherwise they will be ‘deactivated' by the Federal Explosives Licensing Center." This statement is incorrect because responsible persons do not submit EPQs (Employee Possessor Questionnaires). An EPQ must be submitted for all employee possessors at each renewal. In addition, all responsible persons must be appropriately listed under item number 11–Responsible Person List on the renewal application because those responsible persons who are not listed—and those employee possessors for whom documents are not submitted with the renewal—will be deactivated by the Federal Explosives Licensing Center.
The Explosives Industry Newsletter is now available online and is no longer distributed to licensees and permittees in "hard copy" format unless specifically requested. Current and previous issues of the newsletter are available on-line at http://www.atf.gov/publications/newsletters/. Licensees and permittees are encouraged to use ATF's new email update subscription service to receive notice whenever a new newsletter is posted to the ATF site at www.atf.gov.
To receive email notices whenever new Explosives Industry Newsletters are posted to the ATF website, licensees and permittees should go to http://www.atf.gov/publications/newsletters/, click on the Receive Explosives Industry News-letter Updates link and complete the requested e-mail and preference information.
Licensees and permittees who do not have Internet access, or who otherwise wish to continue receiving the newsletter by mail, must write to the ATF Distribution Center, 1519 Cabin Branch Dr., Cheverly MD 20785 and ask to be placed on the mailing list for the ATF Explosives Industry Newsletter, ATF M 5400.3.
Phone No.:
(optional)
U.S. Department of Justice
Bureau of Alcohol, Tobacco, Firearms and Explosives
Federal Explosives Licensing Center
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Ley Orgánica de la Procuraduría General de la LEY ORGANICA DE LA PROCURADURIA GENERAL DE LA REPUBLICA Principios generales ARTICULO 1º.- NATURALEZA JURIDICA: La Procuraduría General de la República es el órgano superior consultivo, técnico-jurídico, de la Administración Pública, y el representante legal del Estado en las materias propias de su competencia.
Nuclear Instruments and Methods in Physics Research B 236 (2005) 11–20 High energy ion beam irradiation of polymers for electronic applications D. Fink a,*, P.S. Alegaonkar a,b, A.V. Petrov a,c, M. Wilhelm a, P. Szimkowiak a, M. Behar d, D. Sinha a,e, W.R. Fahrner f, K. Hoppe g, L.T. Chadderton h a Hahn-Meitner-Institut, Glienicker Str. 100, D-14109 Berlin, Germany