Level structure of 35Cl from the 32S(α,pγ)35Cl reaction

1970 ◽  
Vol 48 (10) ◽  
pp. 1259-1269 ◽  
Author(s):  
B. W. Hooton ◽  
O. Häusser ◽  
F. Ingebretsen ◽  
T. K. Alexander
Keyword(s):  
Excitation Energy ◽  
Level Structure ◽  
Branching Ratios ◽  
The Other ◽  
Mixing Ratios ◽  
Γ Ray ◽  
Four Levels

Proton–gamma coincidences from the reaction 32S(α,pγ)35Cl at Eα = 10.975, 11.960, and 12.120 MeV have been measured, using method II of Litherland and Ferguson. Twelve previously unreported levels between 3.94 and 6.40 MeV excitation energy have been found. The spins of four levels, 1.763 (5/2), 2.646 (7/2), 3.945 (9/2), and 4.885 (7/2), have been determined. Possible spins have been assigned to 12 of the other levels. Branching ratios and γ-ray multipole mixing ratios for all the levels studied are given.

Lifetime measurements of the six lowest lying levels in 35Cl

1969 ◽  
Vol 47 (12) ◽  
pp. 1295-1306 ◽  
Author(s):  
F. Ingebretsen ◽  
T. K. Alexander ◽  
O. Häusser ◽  
D. Pelte
Keyword(s):  
Gamma Rays ◽  
Doppler Shift ◽  
Gamma Ray ◽  
Level Structure ◽  
Branching Ratios ◽  
Distance Method ◽  
Lifetime Measurements ◽  
Mixing Ratios ◽  
Doppler Shift Attenuation ◽  
Recoil Distance

The energies, gamma-ray branching ratios, and mean nuclear lifetimes of the six lowest lying levels in 35Cl have been measured. Gamma rays following the reaction 32S(α,pγ)35Cl were studied using two Ge(Li) detectors with 15-cm3 and 40-cm3 active volumes respectively. The lifetimes of the five lowest lying levels were measured using the Doppler shift attenuation method, with the results: 1219 keV, [Formula: see text]; 1763 keV, 0.55 ± 0.15 ps; 2646 keV, 0.30 ± 0.09 ps; 2695 keV, <0.03 ps; and 3003 keV, <0.05 ps. The lifetime of the 3163-keV level was measured to be 60 ± 7 ps, using a recoil distance method. The level structure is discussed taking into account known lifetimes, spins, parities, and gamma-ray mixing ratios.

scholarly journals Angular Correlation Measurements in 33S

1977 ◽  
Vol 30 (1) ◽  
pp. 23 ◽  
Author(s):  
JR Southon ◽  
AR Poletti ◽  
DJ Beale
Keyword(s):  
Excitation Energy ◽  
Angular Correlation ◽  
High Energy ◽  
Branching Ratios ◽  
Angular Correlations ◽  
Mixing Ratios ◽  
Weak Decays ◽  
Energy States

The 32S(d, p) reaction has been used to excite states in 33S. Proton-gamma angular correlations for states up to 4�43 MeV in excitation energy have been measured to determine spins and y-ray branching and multipole mixing ratios. Results obtained for mixing ratios include 0(1� 97-+0) = 0'75�0'38, 0(2'93-+0) = 0�19�0�14 and 0(2'93-+1'97) = O�OO�O�04. Spin and parity assignments of 3/2 + and (1/2+, 3/2�) have been found for the 3� 94 and 4�43 MeV states respectively. Branching ratios have been determined for several previously unreported weak decays from high energy states.

scholarly journals Overview of two deterministic modelings for prompt emission in fission

2021 ◽  
Vol 256 ◽  
pp. 00017
Author(s):  
Anabella Tudora
Keyword(s):  
Experimental Data ◽  
Kinetic Energy ◽  
Excitation Energy ◽  
The Other ◽  
New Method ◽  
Total Kinetic Energy ◽  
Γ Ray ◽  
Total Excitation Energy ◽  
The University ◽  
Prompt Emission

Two models with a deterministic treatment of prompt emission in fission were developed at the University of Bucharest. Both models work with the same ranges of initial fragments and total kinetic energy and they use the same partition of the total excitation energy at full acceleration based on modelling at scission. The main difference between these modelings regards the prompt emission treatment itself. I.e. the Point-by-Point (PbP) model uses a global treatment of sequential emission while the other modeling is based on an event-by-event treatment of sequential emission. Both models are submitted to a rigorous validation. This paper focuses on model results of different prompt γ-ray quantities, which describe very well the existing experimental data. A new method to calculate prompt γ-ray spectra, including a global treatment based on the distribution of prompt γ-ray energy per quanta, is proposed.

The 23Na(α,γ)27Al reaction. A survey of the reaction and some properties of the 27Al nucleus

1969 ◽  
Vol 47 (15) ◽  
pp. 1545-1555 ◽  
Author(s):  
H. Röpke ◽  
N. Anyas-Weiss
Keyword(s):  
Excitation Energy ◽  
Excited States ◽  
Bound States ◽  
Branching Ratios ◽  
Angular Distributions ◽  
Particle Capture ◽  
Excitation Energies ◽  
Decay Modes ◽  
Γ Ray ◽  
27Al Reaction

The 23Na(α,γ) reaction has been studied in the region Eα = 2–3 MeV. The γ-ray spectra from a total of 16 resonances have been surveyed using a 40 cm3 Ge(Li) detector. Excitation energies, γ-ray decay modes, branching ratios, and γ-ray yields of these resonances are given. Below Eα = 2.7 MeV, all resonances have [Formula: see text] and the α-particle capture proceeds with [Formula: see text]. The resonances at Eα = 2.696 and 2.797 MeV have strong branches to the Jπ = 11/2+ state in 27Al at 4.509 MeV excitation energy. A measurement of γ-ray angular distributions at these resonances yields Jπ(2.969 res.) = 9/2+, 11/2 and Jπ(2.797 res.) = 9/2+ for the resonances, and Jπ(5.671) = 9/2+, 7/2 and Jπ(4.580) = 9/2+, 7/2 for bound states in 27Al. Investigation of this latter level at the Ep = 2.114 MeV resonance in the 26Mg(p,γ)27Al reaction restricts the spin to 7/2. New excited states in 27Al were found at Ex = 5.504, 5.671, and 7.815 MeV. A state at Ex = 5.499 MeV was confirmed.

Excited States in 53Mn by the 53Cr(p,nγ)53Mn Reaction

1973 ◽  
Vol 51 (17) ◽  
pp. 1840-1849 ◽  
Author(s):  
Woon-Hyuk Chung ◽  
D. M. Sheppard ◽  
W. C. Olsen ◽  
B. C. Robertson
Keyword(s):  
Statistical Model ◽  
Excited States ◽  
Energy Levels ◽  
Branching Ratios ◽  
Angular Distributions ◽  
Reaction Energy ◽  
Yield Curves ◽  
Mixing Ratios ◽  
Doppler Shift Attenuation ◽  
Γ Ray

The properties of the low-lying excited states in 53Mn were studied by measuring γ-ray angular distributions and lifetimes using the 53Cr(p,nγ)53Mn reaction. Energy levels of 53Mn have been found at 0.378, 1.288, 1.440, 1.619, 2.272, 2.405, 2.572, 2.670, 2.687, 2.705, 2.872, 2.876, 2.914, 2.947, 3.005, 3.095, 3.125, 3.183, 3.193, and 3.250 MeV. The measurement of γ-ray angular distributions and yield curves together with predictions based on the compound nuclear statistical model have enabled spin assignments to be made to the following excited states in 53Mn: 1.440 MeV (11/2), 1.619 MeV (9/2), 2.572 MeV (7/2), 2.687 MeV (7/2), 2.947 MeV (9/2), 3.005 MeV (5/2). Multipole mixing ratios and branching ratios were determined for some of the observed transitions. Lifetimes of nine excited states in 53Mn have been measured using the Doppler-shift attenuation method.

Properties of the 2.645, 2.693, 3.001, and 3.162 MeV levels in 35Cl

1970 ◽  
Vol 48 (5) ◽  
pp. 603-615 ◽  
Author(s):  
P. Taras ◽  
J. Matas
Keyword(s):  
Gamma Rays ◽  
Ground State ◽  
Branching Ratios ◽  
Angular Distributions ◽  
Mixing Ratios ◽  
Four Levels

Angular distributions and linear polarizations of the gamma rays emitted in the 35Cl(p, p′γ)35Cl reaction have been measured. Four resonances were investigated at proton energies of 4.24, 4.82, 5.08, and 5.11 MeV. The spin and parity of the levels at 2.645, 2.693, and 3.001 MeV in 35Cl have been deduced to be 7/2+, 3/2+, and 5/2+, respectively, while the spin and parity of the 3.162 MeV level have been confirmed to be 7/2−. The multipolarity mixing ratios of the decay of these four levels to the ground state have been found to be δ(M3/E2) = 0, δ(E2/M1) = +0.26 ± 0.03, δ(E2/M1) = +0.07 ± 0.02, and δ(E3/M2) = −0.25 ± 0.04, respectively. In addition, the branching ratios for the decay of these four levels have been determined.

Study of the 1459-keV level in 19F by the 19F(p,p′γ)19F reaction

1970 ◽  
Vol 48 (7) ◽  
pp. 827-833 ◽  
Author(s):  
S. T. Lam ◽  
A. E. Litherland ◽  
J. J. Simpson
Keyword(s):  
Angular Distribution ◽  
Single Crystal ◽  
Linear Polarization ◽  
Proton Energy ◽  
Branching Ratios ◽  
Mixing Ratio ◽  
Γ Ray ◽  
Good Agreement

The 1459-keV level of 19F was populated by the 19F(p,p′γ)19F reaction at a proton energy of 2.78 MeV. The E2/M1 mixing ratio for the 1459 → 110 keV transition was determined to be [Formula: see text] from a combination of the γ-ray angular distribution and linear polarization and the nuclear lifetime. The γ-ray angular distribution was measured with a coaxial Ge(Li) detector and the γ-ray linear polarization with a planar Ge(Li) detector. The corresponding E2 and M1 transition strengths for a lifetime of 0.084 ± 0.020 ps are found to be [Formula: see text] and 0.10 ± 0.03 W.u. respectively. They are in good agreement with the particle–hole calculations of Benson and Flowers. The branching ratios of the 1459-keV level agree well with those of Poletti et al. The γ-ray transitions from the 1459-keV level provide a good example for demonstrating the usefulness of a single crystal Ge(Li) polarimeter.

scholarly journals PEMBERIAN STIMULAN PADA BIDANG SADAP DALAM MEMPENGARUHI PRODUKSI DAN KUALITAS LATEKS TANAMAN KARET (Hevea brasiliensis (Muell. Arg.)

2019 ◽  
Vol 4 (1) ◽  
pp. 38
Author(s):  
Hayata Hayata ◽  
Yulistiati Nengsih ◽  
Rahmanto Wibowo
Keyword(s):  
Quality Control ◽  
Ash Content ◽  
The Other ◽  
Rubber Content ◽  
Randomized Design ◽  
Treatment Factor ◽  
Completely Randomized Design ◽  
Four Levels ◽  
Latex Production

Production increasing of latex on rubber plants can be increased by using a stimulants. One of it  is Vicar 10 SL. The purpose of this study was to find out the effect of Vicar 10 SL on the production and quality of latex. This research was carried out in the Kasang Parit Village, Sekernan District, Muaro Jambi Regency, and the Goods Quality Control and Certification Center on Industry and trade department   in Jambi Province. The study was conducted in July to August 2017. The design used was a completely randomized design with one treatment factor as the Vicar 10 SL application with four levels of treatment, namely; Without treatment (V0/control), 1 ml/Tree (V1), 2 ml/tree (V2), 3 ml/tree (V3). There were 4 times  repeatation on each treatment. Using  fingers, a Vicar 10 SL solution was applied to the tapping groove which was adjusted to the treatment, and allowed to keep it 24 hours. Tapping is done in the next morning, by following the grooves and be stored in a cup and left until the latex stoped dripping. Vicar was given once a week during 30 days. Tapping was done 3 times a week. The variables observed were latex production (gram/tree/day), dry rubber content (%), latex ash content (%), and latex dirt content (%). Vicar giving 10 SL in the tapping site with a dose of 2 ml / tree gave the highest yield of latex production (93.38 grams / tree / day) and dry rubber content (75.50%) and was significantly different compared to the other treatments. Vicar giving 10 SL in tapping site had no significant effect on latex dirt content and latex ash contentKeywords: Latex, stimulant, product and quality Abstrak Peningkatan produksi lateks pada tanaman karet dapat ditingkatkan dengan menggunakan stimulan. Salah satu pemakaian yang digunakan adalah Vikar 10 SL. Tujuan penelitian ini adalah untuk megetahui penggunaan stimulan pada bidang sadap dalam mempengaruhi produksi dan kualitas lateks. Penelitian ini dilakukan di Desa kasang Parit Kecamatan Sekernan Kabupaten Muaro Jambi, dan Balai Pengujian dan Sertifikasi Mutu Barang (BPSMB) Disperindag Propinsi Jambi. Penelitian dilakukan pada bulan Juli sampai dengan Agustus 2017. Rancangan yang digunakan adalah Rancangan Acak Lengkap dengan satu faktor perlakuan pemberian stimulan (Vikar 10 SL) dengan empat taraf perlakuan  yaitu; Tanpa perlakuan (V0/kontrol),  1 ml/ Pohon (V1),  2 ml/pohon (V2), 3 ml/pohon  (V3). Setiap perlakuan diulang sebanyak 4 kali. Dengan menggunakan jari dioleskan larutan Vikar 10 SL pada alur sadap  yang disesuaikan dengan perlakuan, dan didiamkan selama 24 jam. Penyadapan dilakukan pada pagi hari esoknya, dengan mengikuti alur torehan dan ditampung dalam cawan dan dibiarkan sampai lateks berhenti menetes. Pemberian Vikar dilakukan sekali 7 hari selama 30 hari. Penyadapan dilakukan  3 kali dalam seminggu. Peubah yang diamati adalah produksi lateks (gram/pohon/hari)), kadar karet kering (%), kadar abu lateks (%), kadar kotoran lateks (%). Pemberian stimulan (Vikar 10 SL) pada bidang sadap dengan dosis 2 ml/pohon memberikan hasil yang tertinggi terhadap produksi lateks 93,38 gram/pohon/hari dan kadar karet kering 75,50 % dan berbeda nyata bila dibandingkan dengan perlakuan lainnya. Pemberian stimulan (Vikar 10 SL) pada bidang sadap berpengaruh tidak nyata terhadap kotoran lateks dan kadar abu lateksKata kunci :Lateks, stimulan, produksi dan kualitas

The Influence of Woody and Herbaceous Competition on Early Growth of Naturally Regenerated Loblolly and Shortleaf Pines

1991 ◽  
Vol 15 (4) ◽  
pp. 179-185 ◽  
Author(s):  
M. D. Cain
Keyword(s):  
Pinus Taeda ◽  
Woody Plants ◽  
Early Growth ◽  
The Other ◽  
Herbaceous Plants ◽  
Herbaceous Vegetation ◽  
Competition Control ◽  
Total Control ◽  
Four Levels ◽  
Pinus Taeda L

Abstract Four levels of competition control were used to study the response of naturally regenerated loblolly and shortleaf pines (Pinus taeda L. and P. echinata Mill.) in southern Arkansas. Treatments included: (1) Check (no competition control), (2) woody competition control, (3) herbaceous competition control, and (4) total control of nonpine vegetation. Herbaceous plants were controlled for 4 consecutive years, and woody plants were controlled for 5 years. Control of herbaceous vegetation resulted in significant increases in pine height, groundline diameter (GLD), and volume per tree. Control of only woody competition did not improve pine growth compared to untreated checks. After 5 years, pines on total control plots had significantly larger GLDs and significantly more volume per tree compared to pines on any other treatment. Pine growth gains were achieved with herbaceous competition control and total control of nonpine vegetation although these two treatments averaged 4,000 more pines/ac, in trees taller than 5 ft, than the other two treatments. Results of this investigation represent a unique standard of pine growth to which operational treatments might be compared. South. J. Appl. For. 15(4):179-185.

scholarly journals Mis-match Between the Healthy Food and the Ultra-processed Food Classifications in Australia (OR14-03-19)

2019 ◽  
Vol 3 (Supplement_1) ◽  
Author(s):  
Dorothy Mackerras
Keyword(s):  
Saturated Fat ◽  
Food Choices ◽  
Healthy Food ◽  
Classification Systems ◽  
The Other ◽  
Health Claims ◽  
The Public ◽  
Funding Sources ◽  
Starting Point ◽  
Four Levels

Abstract Objectives Many countries produce guides to healthy food choices for their populations. Healthy food choices are typically based on ensuring micronutrient adequacy while limiting components such as saturated fat, sugar and sodium. It has also been proposed that the degree of food processing can be used as the criterion for classification either for advice to the public or for making regulatory decisions around which food should be allowed to be voluntarily fortified or carry health claims. This study examined the concordance between two such systems. Methods The food database used to analyze intakes reported in the 2011–12 Australian National Nutrition and Physical Activity Survey has been classified by others to identify a) which foods are recommended or ‘discretionary’ in the Guide to Healthy Eating and b) by degree of processing according to the four levels in the NOVA system. The NOVA classifications were collapsed to compare ‘ultra-processed’ foods to the other categories. Results There were 5645 foods in the database after excluding codes used to generate recipes for fortified foods (e.g., vitamins and minerals) and foods added for the 2013 Indigenous wave of the survey. Of the 4014 recommended foods, 23.5% were classed as ultra-processed whereas 31.2% of the discretionary foods were classified as not ultra-processed. In this dataset, nearly one-quarter of the foods would be recommended to the public by one classification but not by the other. Some notable discrepancies were the classification of recommended foods such as margarine and mass produced bread and buns and breakfast cereals as ultra-processed whereas butter, cream, sugar, honey, and homemade cakes, biscuits and jams are not classed as ultra-processed. It should also be noted that the descriptions in classification systems are often imprecisely worded and so some decisions in the two dataset could be debated. Conclusions The survey database serves as a useful starting point to screen possible tools even though it contains averages rather than brand-level information. These two specific classifications do not lead to equivalent advice about which foods to choose. Funding Sources None.

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