Beta-delayed neutrons and high-energy gamma-rays from decay of137I

Ohm, H.; Zendel, M.; Prussin, S.G.; Rudolph, Wolfram W.; Schröder, A.; Kratz, K. L.; Ristori, C.; Pinston, J.A.; Monnand, E.; Schüßler, F.; Zirnheld, J.P.

doi:10.1007/bf01415611

Cited by 31 publications

(18 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, due to the different penetrabilities of the d-and g-wave neutrons, the γ-decay must occur predominantly from the J π = (7/2, 9/2) + emitter states. As a logical consequence, the peak structure of the β dn energy spectrum in this energy range represents mainly l n = 2 neutron emission from J π = 5/2 + levels (see [11], and in particular Fig. 3 therein).…”

Section: β -Delayed Neutron Data For Nuclear Physics and Astrophysicsmentioning

confidence: 86%

“…At that time, using predominantly chemical separation procedures, only about 35 β dn-precursors had been identified via their half-lives (T 1/2 ) and the ratio of their neutron and fission yields to obtain neutron emission probabilities (P n ) among the fission products (see, e.g. [9,10,11,22,23,24,25,26,27,28]). …”

Section: From the Kratz-herrmann Formula To The Deformed Qrpa(gt+ff)mentioning

confidence: 99%

“…[4,5] and for later compilations [36,37]), in the early 1970's the focus was more directed to measuring energy spectra of fission-product nuclei by using different types of detectors (see, e.g. the review article of Kratz in [5], and [6,7,8,9,10,11,12,13,14,15,16]. As already mentioned in the introduction, among the most common experimental methods for β dn-spectroscopy was the use of 3 He filled proportional counters or ionization chambers.…”

Section: High-resolution Spectroscopy Of β -Delayed Neutronsmentioning

confidence: 99%

“…[9,10,11,12,13,43,46,47]). In addition, the spectra of some light-mass isotopes have been measured, among them 11 Li [48], 17 N [49] and the light alkaline nuclei 27−31 Na [41] and 48−50 K (see, e.g. [8,18,42]).…”

Section: High-resolution Spectroscopy Of β -Delayed Neutronsmentioning

confidence: 99%

“…However, with the use of the newly developed high-pressure 3 He ionization chambers by Shalev and Cuttler [6], also applied by the Mainz group [7,8], the surprising observation of clear peak structure in several fission-product β dn spectra (see, e.g. [9,10,11,12,13]) led in the following years to a considerable extension of β dn spectroscopy to various problems in nuclear-structure physics (see, e.g. [13,14,15,16,17]) and astrophysics (see, e.g.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Relevance of β-delayed neutron data for reactor, nuclear physics and astrophysics applications

Kratz

2015

AIP Conference Proceedings

View full text Add to dashboard Cite

Section: β -Delayed Neutron Data For Nuclear Physics and Astrophysicsmentioning

confidence: 86%

Section: From the Kratz-herrmann Formula To The Deformed Qrpa(gt+ff)mentioning

confidence: 99%

Section: High-resolution Spectroscopy Of β -Delayed Neutronsmentioning

confidence: 99%

Section: High-resolution Spectroscopy Of β -Delayed Neutronsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Relevance of β-delayed neutron data for reactor, nuclear physics and astrophysics applications

Kratz

2015

AIP Conference Proceedings

View full text Add to dashboard Cite

The beta-decay of95Rb and97Rb

Kratz

Ohm

Schröder³

et al. 1983

Z Physik A

Self Cite

View full text Add to dashboard Cite

The /~-decay of 377ms 95Rb and 168ms 97Rb has been thoroughly investigated by means of 7-ray, conversion electron and /Ldelayed neutron spectroscopy. More than 97 % of the /~-decay to particle-bound states has been placed in level schemes of 95Sr and 97Sr. High-resolution neutron spectroscopic studies have allowed to extend the knowledge of the excitation spectra up to 9 MeV, respectively 10 MeV. The density of neutron-unbound levels in 95Sr and 97Sr has been derived from peak stripping analyses of the neutron spectra. Beta-strength functions (S~(E)) have been investigated in detail.They indicate that Gamow-Teller /~-decay of both precursors is dominated by nuclear structure. The discovered pronounced resonances and the variation in the shape of So(E ) are compared with predictions from the gross theory of/3-decay and shell model calculations in the random phase approximation (RPA).

show abstract

Neutron capture cross sections for neutron-rich isotopes

et al. 1985

View full text Add to dashboard Cite

Average continuum (Hauser-Feshbach) and resonance (Breit-Wigner) neutron capture rates for neutron-rich isotopes, determined on the basis of recent experimental nuclear physics input parameters, are compared to earlier theoretical reaction rates commonly used in astrophysical model computations.Further progress in nuclear astrophysics is related to more experimental and theoretical efforts in nuclear physics. The main difficulty from a nuclear physics point of view in dealing with neutron burning processes in stellar environments such as the n-or the r-process, lies in reliable neutron capture cross sections (On) on very neutron-rich nuclei. The classical assumption of an isotopic (n,y)-(y,n) equilibrium of course enables abundance calculations to be performed without using reaction cross sections. However, a quantitative assessment of the validity of the equilibrium approximation has, after all, to rely on cross section data.Since the direct measurement of On-rates for short-lived radioactive isotopes is not possible, theoretical average continuum cross sections from statistical Hauser-Feshbach (HF) calculations are commonly used /i/. The reliability of these cross sections has suffered so far from the poor knowledge of the relevant nuclear physics input parameters, such as the neutron binding energyBm the level density p(E), the average decay widths F n and F of compound nuclear (CN) states as well as spin ~nd parity of the target JT and of the lowest-energy states of the compound nucleus J~N" Furthermore, HF-calculations may become unreasonable when applied to nuclei with low p(E). In these cases, where O n may be dominated by single resonances in the energy range of astrophysical interest, the Breit-Wigner (BW) resonance formalism has to be used. This formalism requires additional information on each individual CN state, such as resonance energy En, neutron angular momentum i n and partial decay widths F n and Fy, respectively. As has been demonstrated recently at the example of the CN SYKr /2,3/, for quite a number of short-lived isotopes at least a substantial part of the requested nuclear physics parameters can be derived from the 'inverse reaction' to neutron capture, i.e. B-delayed neutron (and y-ray) emission. In this paper we present first results on the application of this method to derive o_-rates for the two stable target 9 88 n 136 nuclez Kr and Xe as well as for the radioactive target isotopes ~2'9~'9~Sr. A schematic description of the inverse relationship between neutron capture and S-delayed neutron emission (Bdn) is shown in Fig.l for the CN 95Sr. Neutron capture on the J~=O + target nucleus 74 s 94Sr will populate states above Bn=4.16 MeV in 9SSr with all possible J~N" The capture cross section is then given by the fraction of those levels which decay by y-ray emission to bound states in 9SSr. Beta decay from 370 ms 9SRb (J~=5/2-), on the other hand, will only populate J~N=(3/2-7/2) -states in 95Sr according to the Gamow-Teller (GT) selection rules. Depending on their partial decay w...

show abstract

Beta-delayed neutrons and high-energy gamma-rays from decay of137I

Cited by 31 publications

References 19 publications

Relevance of β-delayed neutron data for reactor, nuclear physics and astrophysics applications

Relevance of β-delayed neutron data for reactor, nuclear physics and astrophysics applications

The beta-decay of95Rb and97Rb

Neutron capture cross sections for neutron-rich isotopes

Contact Info

Product

Resources

About