MEMO CP-A/101(10 May 2000)
To: Distribution
From: F.E.Chukreev
Subject: Transformation of Dictionary #27
The modern experiment allows to accelerate (to create) and touse as a target photons, leptons, mesons and any bound set ofnucleons. In this connection role of the Dictionary 27 should bechanged.
It would be probably possible to accept the following rules:
1. The fields 1 and 2 REACTION can contain:
1.1 photon,
1.2 lepton,
1.3 long-lived meson,
1.4 any bound combination baryons, which can not be destroyed
by strong interaction.
2. The fields 3 and 4 REACTION can contain:
Any combination
2.1 photons,
2.2 leptons,
2.3 mesons and2.4 baryons,allowed by the laws of conservation (Energy, Strangeness, Electrical,Baryon and Lepton charges)
3. PART-DET, RAD-DET and DECAY-DATA (DECAY-MON) can contain
only photon, lepton, meson or bound combination nucleons
For example, it is possible to write:
3-LI-6 (P, N) 4-BE-6, IND, SIG, but in PART-DET there should be (A),or (N), as Be-6 - unbound nucleus, its time of life about nuclear.
It is simultaneously necessary to consider and field ISOMER in
27-th Dictionary. The concept isomer continuously extends. Now isomeris the exited state with time of life > 10.E-11 seconds.
In this connection it would be expedient to establish thefollowing rule:
Isomer is any exited state of a nucleus. For Isomer should benecessarily specified or half-life or (and) its excitation energy, orother quantum characteristic. To specify Isomer number unessential.
This number can be any.
Thus, the dictionary 27 should give the compiler only items ofinformation on the bound state of baryon systems. A possible view ofa line of this dictionary:Atomic number (Z)
12
.....
28
....
94

Suitable atomicmasses
1-3
3,4
....
50-78
.....
232,234,236-247

It is necessary to exclude such keyword, as LVL-NUMB. The
reason of it - if today a level, for example, second, tomorrow it canbecome third. For investigated nuclear levels a quantum
characteristic always is known what. If for a level the energy ofexcitation or other quantum characteristic is unknown, its
identification should be given by the free text. If, for example, inreaction the condition is raised which the author names as second
analog and energy of this state is unknown, the compiler shouldwrite:
EN-SEC (E-LVL, Z-Sym-A) and free text to specify theappropriate quantum characteristic. For this purpose it is possible
to use also existing keyword LEVEL-PROP, having permitted to leave
empty some fields.
For example, if there is a speech about a level Si-31, which
is analogue of the basic condition P-31, it can be written down:
EN-SEC (E-LVL,14-SI-31)
LEVEL-PROP (14-SI-31, E-LVL =, SPIN=0.5, PARITY=1.) It isanalog state of P-31 ground state.
We believe that the offered changes will not cause a long tailof changes in existing entries.
Our offers do not cover important cases, in which one orseveral nucleons are in the exited states, as, for example, He-4 (Λ)
system (strangeness of this system =1) and antinucleus. The problem
requires additional consideration.

Distribution:
DUNFORD@BNLND2.DNE.BNL.GOV
VML@BNL.GOVNORDBORG@NEA.FR
KELLETT@NEA.FR
MANOKHIN@IPPE.RSSI.RU
MAEV@IPPE.RSSI.RU
FELIKS@POLYN.KIAE.SUCHUKREEV@POLYN.KIAE.SU
DUNAEVA@EXPD.VNIIEF.RU
VARLAMOV@depni.NPI.MSU.SU
CHIBA@EARTH.SGU.AC.JP
KATO@NUCL.SCI.HOKUDAI.AC.JPTENDOW@POSTMAN.RIKEN.GO.JP
YXZHUANG@MIPSA.CIAE.AC.CN
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VLASOV@KINR.KIEV.UA
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