Low-spin structure of 210 Bi

Similar documents
The Generalized Centroid Difference Method

arxiv: v3 [nucl-ex] 12 Jan 2012

Nuclear Physics and Astrophysics

High-spin studies and nuclear structure in three semi-magic regions of the nuclide chart High-seniority states in Sn isotopes

RFSS: Lecture 6 Gamma Decay

Bogdan Fornal. Institute of Nuclear Physics, Polish Academy of Sciences Krakow, Poland

EXPERIMENTAL METHODS

Fast-Timing with LaBr 3 :Ce Detectors and the Half-life of the I π = 4 Intruder State in 34 P

Joint ICTP-IAEA Workshop on Nuclear Structure and Decay Data: Theory and Evaluation. 28 April - 9 May, ENSDF Decay (Decay Data)

Exploring the Structure of Cold and Warm Nuclei Using Particle Accelerators in India

Spectroscopy of fission fragments using prompt-delayed coincidence technique

SUPPLEMENTARY INFORMATION

Gamma-ray decay. Introduction to Nuclear Science. Simon Fraser University Spring NUCS 342 March 7, 2011

Investigation of Pygmy Dipole Resonance in neutron rich exotic nuclei

DSAM lifetime measurements for the chiral bands in 194 Tl

Fission fragment mass distributions via prompt γ -ray spectroscopy

Gamma-ray spectroscopy I

Inelastic Neutron Scattering Studies: Relevance to Neutrinoless Double-β Decay. Steven W. Yates

SURROGATE REACTIONS. An overview of papers by Jason Burke from LLNL

Doubly Magic Nucleus 208 Pb. Indian Institute of Technology Ropar

Structure of neutron-rich Mg isotopes explored by beta-decay of spin-polarized Na isotopes

Isospin symmetry breaking in mirror nuclei. Experimental and theoretical methods

in2p , version 1-28 Nov 2008

Fitting Function for Experimental Energy Ordered Spectra in Nuclear Continuum Studies

Radiation Detection for the Beta- Delayed Alpha and Gamma Decay of 20 Na. Ellen Simmons

Studies involving discrete spectroscopy. Studies involving total absorption or calorimetry

High-Spin Study of the Shell Model Nucleus 88 Y 49

Addendum to the ISOLDE and Neutron Time-of-Flight Committee

Investigation of radiative proton-capture reactions using high-resolution g-ray spectroscopy

5 th ASRC International Workshop, 14 th -16 th March 2012

Study of multi-nucleon transfer reactions with light nuclei

Coexisting normal and triaxial superdeformed structures in 165 Lu

PHY492: Nuclear & Particle Physics. Lecture 6 Models of the Nucleus Liquid Drop, Fermi Gas, Shell

Nuclear structure input for rp-process rate calculations in the sd shell

Chapter 6. Summary and Conclusions

Core excitations across the neutron shell gap in 207 Tl

A new scintillator detector for nuclear physics experiments: the CLYC scintillator

Alpha Decay. Decay alpha particles are monoenergetic. Nuclides with A>150 are unstable against alpha decay. E α = Q (1-4/A)

Status and perspectives of the GANIL Campaign ACC meeting - Venice

Silvia M. Lenzi University of Padova and INFN. Silvia Lenzi, 10th Int. Spring Seminar on Nuclear Physics, Vietri sul Mare, May 21-25, 2010

Some Aspects of Nuclear Isomers and Excited State Lifetimes

Motivation. g-spectroscopy deals with g-ray detection and is one of the most relevant methods to investigate excited states in nuclei.

New Trends in the Nuclear Shell Structure O. Sorlin GANIL Caen

Determination of lifetimes of nuclear excited states using the Recoil Distance Doppler Shift Method in combination with magnetic spectrometers

arxiv:nucl-th/ v1 14 Nov 2005

Nuclear Spin and Stability. PHY 3101 D. Acosta

Measuring Neutron Capture Cross Sections on s-process Radioactive Nuclei

14. Structure of Nuclei

Preparatory experiments for cold-neutron induced fission studies at IKI

A Comparison between Channel Selections in Heavy Ion Reactions

Three-step gamma cascades following the neutron capture in 161 Dy

Study of the spin orbit force using a bubble nucleus O. Sorlin (GANIL)

Particle excitations and rotational modes in nuclei with A 70-90

Nuclear Isomerism. Phil Walker. University of Surrey. on the occasion of the 70th birthday of Geirr Sletten

Spectroscopy of hypernuclei. Spectroscopy of hypernuclei. Alessandro Feliciello I.N.F.N. - Sezione di Torino

Probing neutron-rich isotopes around doubly closed-shell 132 Sn and doubly mid-shell 170 Dy by combined β-γ and isomer spectroscopy.

New data on β decay of exotic nuclei close to 100 Sn:

Nuclear Isomers: What we learn from Tin to Tin

Radiative Capture Reaction

Shape coexistence in light Krypton isotopes

Measurements of B(E2) transition rates in neutron rich carbon isotopes, 16 C- 20 C.

Gamma-ray spectroscopy II

First results from the AGATA Demonstrator. Francesco Recchia Università di Padova

Isospin Character of Low-Lying Pygmy Dipole States via Inelastic Scattering of 17 O ions

Coexistence phenomena in neutron-rich A~100 nuclei within beyond-mean-field approach

Intro to Nuclear and Particle Physics (5110)

Yrast and near-yrast excitations up to high spin in Cd 52

Shell-model description for beta decays of pfg-shell nuclei

γ-γ coincidences using large fast-timing arrays

One- and two-phonon wobbling excitations in triaxial 165 Lu

Testing the shell closure at N=82 via multinucleon transfer reactions at energies around the Coulomb barrier

Weak decay of hypernuclei with FINUDA. Alessandro Feliciello I.N.F.N. - Sezione di Torino

Evidence for K mixing in 178 Hf

The Nuclear Many-Body problem. Lecture 3

Application of positrons in materials research

Search for the chiral doublet bands in 78 Br. Speaker: C. Liu Supervisor: Prof. S. Y. Wang Shandong University, Weihai

Nuclear Lifetimes. = (Eq. 1) (Eq. 2)

3. Perturbed Angular Correlation Spectroscopy

Sunday Monday Thursday. Friday

Investigation of the Pygmy Dipole Resonance in particle- coincidence experiments

Nuclear Reactions A Z. Radioactivity, Spontaneous Decay: Nuclear Reaction, Induced Process: x + X Y + y + Q Q > 0. Exothermic Endothermic

Compound and heavy-ion reactions

Warm superdeformed nuclei:

A brief history of neutrino. From neutrinos to cosmic sources, DK&ER

Magnetic rotation past, present and future

Colinear ternary fission and nucleon phase model G. Mouze, S. Hachem and C. Ythier

solenoid and time projection chamber for neutron lifetime measurement LINA

Institut d Astronomie et d Astrophysique, Université Libre de Bruxelle, Belgium

Alpha-Gamma discrimination by Pulse Shape in LaBr 3 :Ce and LaCl 3 :Ce

arxiv: v1 [physics.ins-det] 26 Sep 2018

LOW-LYING STATES OF ODD NUCLEI IN THE SOUTH WEST 208 Pb REGION

High precision neutron inelastic cross section measurements

Structure of Sn isotopes beyond N =82

The two-step (and multiple-step) γ cascade method as a tool for studying γ-ray strength functions. Milan Krtička

BETA DECAY. Q = m x m y. Q = m x m y 2m e. + decay, a. + Decay : X! Y e

Measurements of high energy g-rays from collective states

β and γ decays, Radiation Therapies and Diagnostic, Fusion and Fission Final Exam Surveys New material Example of β-decay Beta decay Y + e # Y'+e +

Lifetime Measurement in 103,104 Rh with RDDS Method in Inverse Kinematics: A Test for Nuclear Chirality. Suzuki Tomokazu

Detector Array for Low Intensity radiation. DALI and DALI2. S.Takeuchi, T.Motobayashi. Heavy Ion Nuclear Physics Laboratory, RIKEN

Magdalena Matejska-Minda HIL, University of Warsaw. NUSPIN 2017, June 2017, GSI

Transcription:

Low-spin structure of 21 Bi investigated in cold-neutron capture reaction on 29 Bi Natalia Cieplicka, S. Leoni, B. Fornal INFN, Sezione di Milano 5th orkshop on Nuclear Level Density and Gamma Strength, Oslo, May 18-22, 215

Physics motivation hy the 21 Bi nucleus is an ideal nucleus for testing the shell-model calculations? A rich ground for comparisons with theory, also states arising from coupling of proton and neutron particles excitations to the 3 first excited state of octupole character in doubly-magic 28 Pb are also expected. The unknown multipolarity of the main transition feeding the ground state introduced rather large uncertainties in measurements of the capture cross section to the ground state in 21 Bi. Z=82 N=126 The measured lifetimes may be compared to predictions of shell-model calculations. 5th orkshop on Nuclear Level Density and Gamma Strength, Oslo, May 18-22, 215

Physics motivation hy the 21 Bi nucleus is an ideal nucleus for testing the shell-model calculations? A rich ground for comparisons with theory, also states arising from coupling of proton and neutron particles excitations to the 3 first excited state of octupole character in doubly-magic 28 Pb are also expected. Z=82 N=126 The unknown multipolarity of the main transition feeding the ground state introduced rather large uncertainties in measurements of the capture cross section to the ground state in 21 Bi. 28 Pb 21 Bi The measured lifetimes may be compared to predictions of shell-model calculations. 5th orkshop on Nuclear Level Density and Gamma Strength, Oslo, May 18-22, 215

Physics motivation hy the 21 Bi nucleus is an ideal nucleus for testing the shell-model calculations? A rich ground for comparisons with theory, also states arising from coupling of proton and neutron particles excitations to the 3 first excited state of octupole character in doubly-magic 28 Pb are also expected. The unknown multipolarity of the main transition feeding the ground state introduced rather large uncertainties in measurements of the capture cross section to the ground state in 21 Bi. 28 Pb 21 Bi 4-, 5-465 Z=82 2-9- T 1/2 271 32 1- N=126 The measured lifetimes may be compared to predictions of shell-model calculations. 5th orkshop on Nuclear Level Density and Gamma Strength, Oslo, May 18-22, 215

Experiment ILL Grenoble (PF1B line) 8 EXOGAM clovers 6 GASP detectors 2 ILL clovers n 29 Bi γ 21 Bi γ γ Cold neutron flux of 2 1 1 /(ns cm 2 ) from the ILL reactor with energy < 5 mev 29 Bi solid target (3g) Population of capture state in 21 Bi at binding energy of 4.6 MeV 16 Ge detectors of EXILL array: 8 of EXOGAM, 6 of GASP, and 2 from ILL collaboration coincidence measurements of gamma rays 5th orkshop on Nuclear Level Density and Gamma Strength, Oslo, May 18-22, 215

Experiment ILL Grenoble (PF1B line) 8 EXOGAM clovers 6 GASP detectors 2 ILL clovers 16 Ge detectors of EXILL array: 8 of EXOGAM, 6 of GASP, and 2 from ILL collaboration coincidence measurements of gamma rays 8 detectors of EXOGAM arranged into ring around the target at every 45 so angular correlation measurements could be performed Measurements of the lifetimes with FATIMA detectors 5th orkshop on Nuclear Level Density and Gamma Strength, Oslo, May 18-22, 215

Experimental results: level scheme n 29 Bi γ 21 Bi γ γ γ 9/2 (4, 5 ) 4.6 MeV 29 Bi Capture state at neutron binding energy 1 5th orkshop on Nuclear Level Density and Gamma Strength, Oslo, May 18-22, 215

gate 32 465 21 Bi 5th orkshop on Nuclear Level Density and Gamma Strength, Oslo, May 18-22, 215 32

32 674 gate 2599 113 465 2599 113 674 21 Bi 5th orkshop on Nuclear Level Density and Gamma Strength, Oslo, May 18-22, 215 32

Experimental results: level scheme 64 primary transitions (4 new) Population of neutron capture state at 465.2(1) kev 465 7 excited states (31 new) 21 Bi 5th orkshop on Nuclear Level Density and Gamma Strength, Oslo, May 18-22, 215

Angular correlations of g rays from 21 Bi The angular correlation function for a pair of coincident g rays connecting the nuclear states with spins J i J J f is usually expressed as: g 1 3+ 674 993 (Θ) = 1 + A 2 P 2 (cos Θ) + A 4 P 4 (cos Θ) Θ the angle between the direction of emission of two g rays g 2 2-1- 32 32 P n (cos Θ) Legendre polynomials A n =q n A(1)A(2) the coefficients which depend on the attenuation factor q n as well as on the multipolarities of 1 and 2 g rays and the spins of involved nuclear states q 2 =.86(2) q 4 =.6(3) 674 kev degree 45 degree 9 degree Normalization: number of pairs of the detectors, efficiency (Θ) norm =.495(5) (4 combinations) norm45 = 2.2(12) (16 combinations) norm9 = 1 (8 combinations) 5th orkshop on Nuclear Level Density and Gamma Strength, Oslo, May 18-22, 215

Spin-parity number of the capture state 4 (4, 5 ) 4 5 5 465.2 2 15 32-4257 J=2 2 15 1337-2829 J=1 1 5 1 5 2828 (E1).95.9.85 A 2 =-.5(2), A 4 =.4(3).95.9.85 A 2 =.1(2), A 4 =.4(4) 3633 (E2) 4257 (E2) 2 15 49-3633 J=2 6 + 1777 1 5 experiment 1337(E1).95.9.85 A 2 =-.8(3), A 4 =.4(5) theory 1 2 972 1 49 (M1) 563 5 439 3 348 32 2 32 (M1) 5th orkshop on Nuclear Level Density and Gamma Strength, Oslo, May 18-22, 215 21 Bi

Multipolarity of the main transition leading to the ground state Not confirmed experimentally M1 multipolarity of 32-keV line A. Borella et al., Nucl. Phys. A 85, 1 (211) Thermal capture cross section for the 29 Bi(n,g) 21 Bi reaction to the ground state [mb] 1% M1 5% M1 +5 % E2 1% E2 25(.9) 19.3(.8) 17.2(.7) 4-, 5-465 A. Borella et al., AIP Conf. Proc. 769, 648 (25) 2-32 9-271 32 (M1) T1/2 = 3.4 x 1 6 y 1-5th orkshop on Nuclear Level Density and Gamma Strength, Oslo, May 18-22, 215

Multipolarity of the 32-keV line 2 1175-32 2 124-32 2 1337-32 1 1 1.9 A 2 =.4(3), A 4 =.3(6).9 A 2 =.7(3), A 4 =-.1(6).9 A 2 =.5(3), A 4 =-.2(7).8 Pure E1-M1 A 2 =.6, A 4 =..8 Pure E1-M1 A 2 =.7, A 4 =..8 Pure E1-M1 A 2 =.7, A 4 =. 2 674-32 (6+) (5+) (4+) 1777 177 1524 1.9.8 A 2 =.3(1), A 4 =-.1(2) Pure E1-M1 A 2 =.5, A 4 =. 5-2- 1-1337 124 (E1) (E1) 1175 (E1) 4-32 3- (M1) (3+) 674 (E1) 993 32 5th orkshop on Nuclear Level Density and Gamma Strength, Oslo, May 18-22, 215

3 2 113-32 113-674 3 2 1 1.9.9.8.7 A 2 =.1(5), A 4 =-.1(11).8.7 A 2 =.1(2), A 4 =.1(4) δ 32 =.4 δ 674 =.1 δ 113 =-.15(1) δ 113 =-.15(4) (4) 27 χ 2 = A 2_exp A 2 δ 1,δ 2 A 2_exp 2 + A 4_exp A 4 δ 1,δ 2 A 4_exp 2 3+ 113 993 2-1- 674 32 32 5th orkshop on Nuclear Level Density and Gamma Strength, Oslo, May 18-22, 215

3 2 113-32 113-674 3 2 δ 113 =-.15 4-, 5-465 1.9.8.7 A 2 =.1(5), A 4 =-.1(11) 1.9.8.7 A 2 =.1(2), A 4 =.1(4) δ 674 =.1(3) δ 32 =.4(8) 381 255 3 2 1.9.8.7 255-674 A 2 =-.13(2), A 4 =-.2(5) 3 2 1.9.8.7 255-32 A 2 =-.14(2), A 4 =-.3(3) δ 255 =.55 δ 674 =.15(29) δ 32 =.36(2) 4+ (5) (4) 1524 113 21 27 3 2 1.9.8.7 381-32 A 2 =.7(2), A 4 =.3(4) 3 2 1.9.8.7 381-674 A 2 =.7(2), A 4 =-.1(5) δ 381 =-.37 δ 674 =.9(56) δ 32 =.5(5) 3+ 2-1- 674 32 993 32 5th orkshop on Nuclear Level Density and Gamma Strength, Oslo, May 18-22, 215

Multipolarity of 32-keV transition 674-32 δ 674 =.1(3) δ 32 =.4(3) δ 2 = I L I L I(L) = 1 δ 2 + 1 I(L ) = δ2 δ 2 + 1 674 kev: 99.99% E1 +.1% M2 32 kev: 99.84% M1 +.16% E2 5th orkshop on Nuclear Level Density and Gamma Strength, Oslo, May 18-22, 215

Decays to: 3+, 4-, 3- Spin-parity values: state at 1524 kev 2 53-674 53-32 2 1 1.9.8 2 1.9 2 A.9 2 =.2(1), A 4 =-.2(2) A 2 =.1(1), A 4 =-.3(3) δ 53 =.6(2) 1175-32 A 2 =.4(3), A 4 =.3(6).8 δ 53 =.9(3) 4 + (4+) 1524 3-2- 1-1175 (E1) 3+ 348 53 674 32 M1(+E2) E1(+M2) M1(+E2) 993 32.8 δ 1175 =.3(5) 5th orkshop on Nuclear Level Density and Gamma Strength, Oslo, May 18-22, 215

Decays to: (6-), 8-, 8-, 6-, 7-, 9- State at 1981 kev 4-, 5-465 3 2 2624-179 2624 E2 1.9.8.7 A 2 =.11(3), A 4 =.4(5) Pure E2-E2 A 2 =.1, A 4 =.1 (7-) 7 1981 3 2 1.9.8.7 2624-143 A 2 =-.19(3), A 4 =.(7) δ 143 =-.11(5) 3 2 1.9.8.7 2624-1398 A 2 =-.1(3), A 4 =.2(7) δ 1398 =.5(5) 179 1398 E2 M1(+E2) 143 M1+E2 9-1- 6-8- 583 551 271 5th orkshop on Nuclear Level Density and Gamma Strength, Oslo, May 18-22, 215

Decays to: (6+), (5+), (4+), (4-), (6-), 6-, 4- State at 21 kev 4-, 5-465 4 3 J= 255-32 4 3 J= 255-393 255 E1(+M2) (M1+E2) 2 2 1 1.9.9.8.7 A 2 =-.14(2), A 4 =-.3(3) δ 255 =.4(8) (δ 255 =-.82(12)).8.7 A 2 =.24(3), A 4 =-.1(6) δ 393 =-.3(3) (5+) (5) 5+ 393 21 M1(+E2) (E1+M2) 177 4 3 2 J= 255-674 4 3 2 J=1 255-1596 1596 E1(+M2) (M1+E2) 3+ 993 1.9.8.7 A 2 =-.13(2), A 4 =-.2(5) δ 255 =.7(12) (δ 255 =-.88(19)) 1.9.8.7 A 2 =-.11(2), A 4 =.3(4) δ 1596 =.1(3) 4-2- 1-32 674 M1(+E2) E1(+M2) 32 5th orkshop on Nuclear Level Density and Gamma Strength, Oslo, May 18-22, 215

Decays to: 5+, 4+, 3-, 4-, 3+, 4-, 5-, 3-, 2- State at 27 kev 3 2 113-32 3 113-674 2 1 1.9.9.8.7 3 2 1.9.8.7 A 2 =.1(5), A 4 =-.1(11) δ 113 =-.11(9) δ 113 =-.1(4) 1659-32 A 2 =-.6(5), A 4 =-.8(1) δ 1659 =.23(14).8.7 A 2 =.1(2), A 4 =.1(4) (4+) (4) 27 1659 E1+M2 (M1+E2) 3-2- 1-32 113 M1+E2 (E1+M2) 3+ 674 M1(+E2) 993 E1(+M2) 32 5th orkshop on Nuclear Level Density and Gamma Strength, Oslo, May 18-22, 215

Fed from: BE Decays to: 1-, 3-, 1- State at 1197 kev 4-, 5-465 2 49(M1)-563 2 3633(E2)-563 347 1 1.9 A 2 =-.5(4), A 4 =-.2(8).9 A 2 =.1(3), A 4 =.3(6).8.8 (δ 49 = ) δ 563 =.25(3) δ 563 =.1(8) (2) 1197 634 J=1 2 1.9 634-563 Theory J=1-(M1+E2) δ 563 =.18(16) A 2 =-.7(6), A 4 =-.5(11) A 2 =-.4 A 4 =. 1-1- 563 M1+E2 563.8

Fed from: BE, (6-), (6-), (6-) Decays to: 8-, 8-, 6- State at 1527 kev 4-, 5-465 3 2 611-645 3 2 611-645 3 2 611-645 1 1 1 378.9.8 A 2 =.7(5), A 4 =.7(11).9.8 A 2 =.7(5), A 4 =.7(11).9.8 A 2 =.7(5), A 4 =.7(11) Theory J=2 (6 8) E2 J=2 (8 9) E2 A 2 =-.9 A 4 =. Theory J=2 (7 8) E2 J=2 (8 9) E2 A 2 =.1 A 4 =.14 Theory J=2 (6 8) E2 J=1 (8 9) M1 A 2 =-.7 A 4 =. (7-) 611 (M1) 1527 3 2 1.9.8 611-645 A 2 =.7(5), A 4 =.7(11) Theory J=1 (7 8) M1 J=1 (8 9) M1 A 2 =.5 A 4 =. 8-9- 1-645 (M1) 916 271

Spin distribution from 29 Bi(n,g) 21 Bi reaction (experimental results: shell-model states) 5th orkshop on Nuclear Level Density and Gamma Strength, Oslo, May 18-22, 215

Comparison with shell-model calculations Firmly known states used to fit TBME of p-n interaction E. K. arburton, B. A. Brown, Phys. Rev. C 43, 62 (1991) Experimental results (EXILL) Shell-model calculations

Comparison with shell-model calculations (3) 194 Firmly known states used to fit TBME of p-n interaction E. K. arburton, B. A. Brown, Phys. Rev. C 43, 62 (1991) (7-) 1527 Three states below 2 MeV without theoretical counterparts (1-,2) 1197 Experimental results (EXILL) Shell-model calculations Observed in other experiments

Comparison with shell-model calculations (2,3,4) (3,4) (4,5,6) 312 397 345 323 2979 2883 (3,4,5) 287 (4,5,6) 273 (3,4,5) 2726 3-28Pb 2.6 MeV (4,5) 2556 3 (πh 9/2 νg 9/2 ) 3- - 3+ 3-1- 2+, 3+, 4+ 3-9- 6+, 7+, 8+, (9+, 1+, 11+, 12+) (5) 4(+) 2147 27 Experimental results (EXILL) Shell-model calculations Observed in other experiments

Comparison with shell-model calculations Higher part of the level scheme: states arising from the valence particles excitations. Experimental results (EXILL) Shell-model calculations Observed in other experiments

Decay Feeder Measurements of the lifetimes of excited states in 21 Bi 32 kev LaBr 674 kev Clover LaBr Clover 3+ 674 kev 993 2-1- 32 32 kev 5th orkshop on Nuclear Level Density and Gamma Strength, Oslo, May 18-22, 215

Decay Feeder Measurements of the lifetimes of excited states in 21 Bi 32 kev LaBr 674 kev Clover 32 kev LaBr Clover LaBr Clover 3+ 2-993 674 kev 32 LaBr gate 32 kev 1-5th orkshop on Nuclear Level Density and Gamma Strength, Oslo, May 18-22, 215

Decay Feeder Measurements of the lifetimes of excited states in 21 Bi 32 kev LaBr 674 kev Clover 32 kev LaBr Clover LaBr Clover 3+ 2-993 674 kev 32 LaBr gate 32 kev 1-5th orkshop on Nuclear Level Density and Gamma Strength, Oslo, May 18-22, 215

Decay Feeder Measurements of the lifetimes of excited states in 21 Bi 1 2 C C compton C PRD ΔC = 22 ps ΔC compton = 16.8 ps PRD (E feeder E decay ) = -83.4 ps π =.8 3+ 993 τ = 2(9) ps τ lit = 7.5(14) ps Phys Rev. C 12, 1547(1975) 2-1- 674 kev 32 32 kev 5th orkshop on Nuclear Level Density and Gamma Strength, Oslo, May 18-22, 215

Measurements of the lifetimes of excited states in 21 Bi 2, 32 kev τ = 2(9) ps 3+, 993 kev τ < 4 ps 5(+) 3+ 576 kev 21 4+ 1524 53 kev 993 4+, 1524 kev τ = 31(16) ps S. Lodetti, MS Thesis, Milano (215) 5th orkshop on Nuclear Level Density and Gamma Strength, Oslo, May 18-22, 215 2-1- 674 kev 32 32 kev

Summary The level structure of 21 Bi investigated in cold neutron capture on 29 Bi was compared to shell model calculations some of the states must come from the core excitations. The analysis of angular correlations allowed to confirm almost pure M1 character of the main transition leading to the ground state. The results of present analysis of 21 Bi structure will serve as an excellent testing ground for the future calculataions. 5th orkshop on Nuclear Level Density and Gamma Strength, Oslo, May 18-22, 215

2024 © sciencedocbox.com Privacy Policy | Terms of Service | Feedback