--- name: dp-b-e-a-records-80-column-standards description: "ENSDF DP (Delayed Proton), B (Beta Minus), E (Electron Capture/Beta Plus), and A (Alpha) record 80-column format specifications and field definitions." --- # DP, B, E, and A Record 80-Column Standards Use this skill when checking or writing delayed proton, beta minus, electron capture/beta plus, or alpha decay records in ENSDF files. Note that readability spaces may be absent in many ENSDF files, which are not necessary for machine parsing. ## Record Standards ### Delayed Proton Emission Record (DP-Record) ```text Example: 12345678901234567890123456789012345678901234567890123456789012345678901234567890 35XX DP EP DE IP DI EI 35CL DP 501 10 3.5 12 9022 ``` | Field | Columns | Description | | :---- | :------ | :------------------------------------- | | NUCID | 1–5 | Nucleus (e.g., " 35Cl" or " 35P ") | | CONT | 6 | Continuation label (blank) | | SPACE | 7 | Must be blank | | D | 8 | "D" for delayed particle | | P | 9 | "P" for proton | | SPACE | 10 | Readability space | | EP | 11–19 | Proton energy in keV | | DE | 20–21 | Energy uncertainty | | SPACE | 22 | Readability space | | IP | 23–29 | Proton intensity in percent | | DIP | 30–31 | Uncertainty in IP | | SPACE | 32 | Readability space | | EI | 33–39 | Energy of proton-emitting level in keV | **Critical DP Format Rules:** - Delayed Neutron Emission Record (DN-Record), Delayed Alpha Emission Record (DA-Record), Delayed Deuteron Emission Record (DD-Record), and Delayed Triton Emission Record (DT-Record) follow the same format as DP-Records, with "D" in column 8 and "N", "A", "D", or "T" in column 9, respectively. - Readable spaces at columns 10, 22, and 32 for human readability. - All field positioning follows standard ENSDF left-justification rules. ### Beta Minus Decay Record (B-Record) ```text Example: 12345678901234567890123456789012345678901234567890123456789012345678901234567890 35XX B EEEE.E DE IB DI LOGFT DFT CUNQ 35P B 1572.0 1 100.0 4 5.23 12 C1U ``` | Field | Columns | Description | | :---- | :------ | :------------------------------------------------------------------------------ | | NUCID | 1–5 | Nucleus (e.g., " 35P " or " 35Cl") | | CONT | 6 | Continuation label | | SPACE | 7 | Must be blank | | TYPE | 8 | "B" for beta minus | | SPACE | 9 | Must be blank | | E | 10–19 | Endpoint energy of β⁻ in keV (no need to edit) | | DE | 20–21 | Energy uncertainty | | SPACE | 22 | Readability space | | IB | 23–29 | Intensity of β⁻-decay branch | | DIB | 30–31 | Uncertainty in IB | | SPACE | 32–41 | Must be blank | | SPACE | 42 | Readability space | | LOGFT | 43–49 | The log ft for the β⁻ transition | | DFT | 50–55 | Uncertainty in LOGFT | | SPACE | 56–76 | Must be blank | | C | 77 | Comment flag ('C' denotes coincidence, '?' denotes probable coincidence) | | UN | 78–79 | Forbiddenness classification ('1U', '2U' for unique forbidden, blank = allowed) | | Q | 80 | '?' denotes uncertain or questionable beta minus decay | **Critical B-Record Rules:** - Must follow LEVEL record for the level which is fed by the beta minus decay. - IB intensity in same units as other intensity fields in file. - LOGFT for uniqueness classification (col 78-79). - Blank signifies allowed transition for forbiddenness field. ### Electron Capture and Beta Plus Decay Record (E-Record) ```text Example: 12345678901234567890123456789012345678901234567890123456789012345678901234567890 35XX E EEEE.E DE IB DI IE DI LOGFT DFT TI DICUNQ 35CL E 1750.0 5 65.0 8 35.0 5 4.85 15 100.0 8 C1US ``` | Field | Columns | Description | | :---- | :------ | :------------------------------------------------------------------------------ | | NUCID | 1–5 | Nucleus (e.g., " 35Cl" or " 35P ") | | CONT | 6 | Continuation label | | SPACE | 7 | Must be blank | | TYPE | 8 | "E" for electron capture | | SPACE | 9 | Must be blank | | E | 10–19 | Energy for electron capture to level (no need to edit) | | DE | 20–21 | Uncertainty in E | | SPACE | 22 | Readability space | | IB | 23–29 | Intensity of β⁺-decay branch | | DIB | 30–31 | Uncertainty in IB | | IE | 32–39 | Intensity of electron capture branch | | DIE | 40–41 | Uncertainty in IE | | SPACE | 42 | Readability space | | LOGFT | 43–49 | The log ft for (ε + β⁺) transition | | DFT | 50–55 | Uncertainty in LOGFT | | SPACE | 56–64 | Must be blank | | TI | 65–74 | Total (ε + β⁺) decay intensity | | DTI | 75–76 | Uncertainty in TI | | C | 77 | Comment flag ('C' denotes coincidence, '?' denotes probable coincidence) | | UN | 78–79 | Forbiddenness classification ('1U', '2U' for unique forbidden, blank = allowed) | | Q | 80 | '?' = uncertain branch, 'S' = expected or assumed transition | **Critical E-Record Rules:** - Must follow LEVEL record for the level being populated in the decay. - IE, IB and TI must be in same units. - TI = IE + IB for total decay intensity to the level. - Forbiddenness classification in columns 78-79 ('1U', '2U' for first-, second-unique forbidden). ### Alpha Decay Record (A-Record) ```text Example: 12345678901234567890123456789012345678901234567890123456789012345678901234567890 235XX A EEEE.E DE IA DI HF DHF C Q 204AT A 6632 6 100 5 1.5 3 C ? ``` | Field | Columns | Description | | :---- | :------ | :----------------------------------------------------------------------------- | | NUCID | 1–5 | Nucleus (e.g., " 35P " or "204AT") | | CONT | 6 | Continuation label | | SPACE | 7 | Must be blank | | TYPE | 8 | "A" for alpha decay | | SPACE | 9 | Must be blank | | E | 10–19 | Alpha energy in keV | | DE | 20–21 | Standard uncertainty in E | | SPACE | 22 | Readability space | | IA | 23–29 | Intensity of α-decay branch in percent of the total α decay | | DIA | 30–31 | Standard uncertainty in IA | | SPACE | 32 | Readability space | | HF | 33–39 | Hindrance factor for α decay | | DHF | 40–41 | Standard uncertainty in HF | | SPACE | 42–76 | Must be blank | | C | 77 | Comment flag ('C' denotes coincidence, '?' denotes probable coincidence) | | SPACE | 78–79 | Must be blank | | Q | 80 | '?' = uncertain or questionable α branch, 'S' = expected or predicted α branch | **Critical A-Record Rules:** - Must follow the daughter LEVEL record for the level being populated in the α decay.